NOTICE:
This Legacy journal article was published in Volume 5, November 1994, and has not been
updated since publication. Please use the search facility above to find regularly-updated information about
this topic elsewhere on the HEASARC site.
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The HEASARC Online Service
Pat Tyler
HEASARC
The HEASARC currently has over 140 databases available for browsing within the
Online Service. The following is the listing of SYSTEM databases:
Name Description Observatory
ASCAPUBLIC Archival Data ASCA
ASCAO Proposals ASCA
ASCALOG Observations Log ASCA
ARIEL ARIEL-V All-Sky Monitor Ariel-V
ARIEL3A 3rd Ariel-V SSI Catalog Ariel-V
BBXRT BBXRT Archive BBXRT
OSTARS Galactic O-Stars Catalog CATALOG
PULSAR Lyne Pulsar Catalog CATALOG
PKSCAT90 Parkes Southern Radio Catalog CATALOG
SAO SAO Stars Catalog CATALOG
QSO Hewitt & Burbidge QSO Catalog CATALOG
RC3 3rd Ref Catalog of Gal's CATALOG
RITTER Ritter CVs & LMXRBs Catalog CATALOG
LBN Lynds Bright Nebulae Catalog CATALOG
NORTH20CM 20cm Radio Catalog CATALOG
NGC2000 NGC 2000.0 Catalog CATALOG
MRC Molonglo Radio Src Catalog CATALOG
MCKSION McCook & Sion WD Catalog CATALOG
MCG Morphological Galaxy CATALOG
LDN Lynds Dark Nebulae Catalog CATALOG
KUEHR Extragal. Radio Sources CATALOG
NORTH6CM 6cm Radio Catalog CATALOG
PPM Positions and Proper Motions CATALOG
PLNEBULAE Strasbourg Gal Planet Nebulae CATALOG
HIIREGION Sharpless H II Region Catalog CATALOG
ZCAT Huchra CfA Redshift Catalog CATALOG
PMN PMN Southern & Tropical Survey CATALOG
GSC Guide Star Catalog CATALOG
ABELL Abell Clusters CATALOG
XRBCAT X-Ray Binaries CATALOG
SNRGREEN Green SNR Catalog CATALOG
WOOLLEY Stars <25 pc from Sun CATALOG
VSTARSUSP Suspected Variables Catalog CATALOG
VSTARS 4th Variable Stars Catalog CATALOG
VLANEP 1.5GHz VLA-NEP Survey CATALOG
VERON91 Veron Quasars & AGN CATALOG
VERON89 Veron Quasars & AGN Catalog CATALOG
HBC 3d Emission-Line Star Catalog CATALOG
DOCUMENTS HEASARC Documents CATALOG
DIXON Dixon Radio Sources CATALOG
CNS3 Nearby Stars (3rd Ed) CATALOG
BSC5P Bright Stars CATALOG
HD Henry Draper Catalog CATALOG
HIC Hipparcos Input Main Catalog CATALOG
BESTARS Be Stars CATALOG
CVCAT Cataclysmic Variables Catalog CATALOG
BD Bonner Durchmusterung CATALOG
GROLOG Viewing Plan CGRO
EGRET EGRET pointing database CGRO
BBURST BATSE Bursts Catalog CGRO
COSB Photon Event Files COS B
IPCDEEP IPC Deep Catalog EINSTEIN
EUVEBSL 1st EUVE Bright Sources EUVE
EUVECAT1 First EUVE Source Catalog EUVE
EXOGPS EXOGPS Source Catalog EXOSAT
EXOPUBS Bibliography EXOSAT
EXOFOT Final Observation Tapes EXOSAT
LE CMA Central 6 Arcmin Catalog EXOSAT
CMA CMA Catalog EXOSAT
CMAIMAGE CMA Images EXOSAT
GS GS Spectra and Lightcurves EXOSAT
EXOLOG Observation Log EXOSAT
TGS TGS L and R Orders EXOSAT
ME EXOSAT ME Database EXOSAT
TGS2 TGS Spectra and Lightcurves EXOSAT
EINLOG Observation Log Einstein
SSSHME SSS Modified Einstein
IPCIMAGE IPC Images Einstein
EMSS EMSS Catalog Einstein
IPC IPC Catalog Einstein
HRIDEEP Deep Survey HRI Src Positions Einstein
HRIEXO HRI EXO Source Catalog Einstein
FPCSFITS FPCS Events Files Einstein
IPCPHOT IPC Photon Event Data Einstein
SSS SSS Spectra and Lightcurves Einstein
HRICFA HRI CfA Source List Catalog Einstein
HRIIMAGE HRI Image Einstein
HRIPHOT HRI Photon Event Data Einstein
IPCSLEW IPC Slew Catalog Einstein
GSC12 12-13hr Guide Star Catalog GSC
GSC11 11-12hr Guide Star Catalog GSC
GSC13 13-14hr Guide Star Catalog GSC
GSC9 09-10hr Guide Star Catalog GSC
GSC10 10-11hr Guide Star Catalog GSC
GSC4 04-05hr Guide Star Catalog GSC
GSC8 08-09hr Guide Star Catalog GSC
GSC6 06-07hr Guide Star Catalog GSC
GSC5 05-06hr Guide Star Catalog GSC
GSC14 14-15hr Guide Star Catalog GSC
GSC23 23-24hr Guide Star Catalog GSC
GSC22 22-23hr Guide Star Catalog GSC
GSC15 15-16hr Guide Star Catalog GSC
GSC20 20-21hr Guide Star Catalog GSC
GSC21 21-22hr Guide Star Catalog GSC
GSC19 19-20hr Guide Star Catalog GSC
GSC18 18-19hr Guide Star Catalog GSC
GSC17 17-18hr Guide Star Catalog GSC
GSC16 16-17hr Guide Star Catalog GSC
GSC7 07-08hr Guide Star Catalog GSC
GSC3 03-04hr Guide Star Catalog GSC
GSC2 02-03hr Guide Star Catalog GSC
GSC1 01-02hr Guide Star Catalog GSC
GSC0 00-01hr Guide Star Catalog GSC
GINGAMODE Ginga LAC Mode Catalog Ginga
GINGALOG LAC Observation Log Ginga
A2LED HEAO 1 A2 LED Sky Catalog HEAO1
A4 A4 X-Ray Catalog HEAO1
A3 MC LASS Catalog HEAO1
A2PIC HEAO 1 A2 Piccinotti Catalog HEAO1
A1 HEAO 1 A1 X-ray Catalog HEAO1
A2POINT A2 Point Catalog HEAO1
HSTEXP HST Exposure Catalog HST
HSTOBS HST Observations Catalog HST
IRASFSC IRAS Faint Source Catalog IRAS
IRASID IRAS FSC Assoc. Catalog IRAS
IRASPSC IRAS Point Source Catalog IRAS
OPTICAL Optical Catalogs MASTERCAT
ALLDATA Archival Data MASTERCAT
OBSLOG Observation Logs MASTERCAT
RADIO Radio Catalogs MASTERCAT
XCOLL X-ray Collim. Catalogs MASTERCAT
XRAY x-ray Catalogs MASTERCAT
PVOTRIG PVO Gamma-ray Burst Catalog PVO
ROSAO Proposals ROSAT
ROSLTL Long-term Timeline ROSAT
ROSPUBLIC Archival Data ROSAT
ROSDISTRIB Distributed Data ROSAT
ROSATSRC Catalog of Rev0/1 PSPC sources ROSAT
WFCPOINT WFC Public Archive ROSAT
WGACAT Catalog of PSPC WGA Sources ROSAT
ROSATLOG Observation Log ROSAT
ROSSTL Short-term Timeline ROSAT
WFCBSC Catalog of WFC Bright Sources ROSAT
ROSID SIMBAD for ROSAT Databases ROSAT
ROSOBS Processing Status ROSAT
SMMGRS GRS Gamma-Ray Bursts SMM
ZZDB Catalog of WGA Point Sources SYSTEM
ZZFNAME Metabase: File Relations SYSTEM
ZZHISTDB Database Access History SYSTEM
ZZFILES Metabase: Available Files SYSTEM
ZZHISTPR Products Access History SYSTEM
TD1 Stellar UV Flux Catalog TD1
UHURU4 4th Uhuru Catalog Uhuru
KONUS Konus 11 & 12 Burst Catalog VENERA
VELA5B All-Sky Monitor Lightcurves Vela 5B
145 database tables found
Recent additions to the HEASARC Online Service
ASCALOG - ASCA Observations Log
The ASCALOG database contains the ASCA observations log for phases IT
(instrument turn-on), PV (performance verification), and AO1.
ASCAPUBLIC - ASCA Archive Public
Contents List
This table contains a record of data from the ASCA mission that is available
from the HEASARC archive. The listing includes future data which may not yet be
in the public domain. The data will initially be released in one-month batches,
around the 15th of each month, with the first batch released on November 15,
1994. As the archive population becomes routine, the releases will be made more
often, on a weekly basis.
BD - Bonner Durchmusterung
The BD database contains the Bonner Durchmusterung visual survey of stars in
the declination zones +89 to -01 degrees. The survey, completed by Argelander
and his assistants in the years 1852-1861, was performed and the stars
cataloged by allowing the telescope to drift along the mean declination of each
zone and recording the positions and magnitudes of stars crosssing the transit
line of each field. The goal of the survey was to obtain a position and
estimated visual magnitude for every star visible with the 78-mm Bonn
telescope. Actual magnitude estimates were made and reported to 0.1 mag for all
stars down to 9.5 mag, with fainter stars being assigned to 9.5. Thus, the BD
actually contains a rather large number of stars fainter than 10.0 mag.
Positions are given to the nearest 0.1 sec in right ascension and 0.1 arcmin in
declination.
BESTARS - Catalogue of Be Stars
The BESTARS database contains the Catalogue of Be Stars, a compilation of data
concerning stars of type Be. For the purposes of this compilation, a Be star
is defined as a non-supergiant B star which showed emission in one Balmer line
at least once. Stars without published MK spectral types have been excluded
except for 132 stars from Bidelman and MacConnell (1973), who used the above
definition but included no spectral types. There are 1159 stars included in
this list.
BSC5P - Bright Star Catalog
The BSC5P database contains data derived from the Bright Star Catalog, 5th
Edition, preliminary, which is widely used as a source of basic astronomical
and astrophysical data for stars brighter than magnitude 6.5. The database
contains the identifications of included stars in several other widely-used
catalogs; double- and multiple-star identifications; indication of variability
and variable-star identifiers; equatorial positions for B1900.0 and J2000.0;
galactic coordinates; UBVRI photoelectric photometric data, when they exist;
spectral types on the Morgan-Keenan (MK) classification system; proper motions
(J2000.0); parallax; radial- and rotational-velocity data; and multiple-star
information (number of components, separation, and magnitude differences) for
known nonsingle stars.
CPSTARS - General Catalog of Ap and Am
Stars
CPSTARS is derived from data contained in the General Catalogue of Ap and Am
Stars by Renson, Gerbaldi, and Catalano. The catalog contains 6684 objects
which represents a collection of all Ap and Am stars discovered to date
(1991).
EUVEBSL - First EUVE Bright Source List
This catalog contains a detailed list of verified bright EUVE sources detected
during the survey phase of the EUVE mission (calibration targets are also
included). Two distinct surveys, the all-sky and deep surveys, were conducted
by the four EUVE telescopes during the first six months of the mission.
EUVECAT1 - The First EUVE Source Catalog
The EUVECAT1 database contains a detailed list of verified bright sources
detected during the survey phase of the Extreme Ultraviolet Explorer (EUVE)
mission (calibration targets are also included). Additionally, this database
includes the sources derived from the First EUVE Source Catalog Supplementary
list, which were a part of the Bright Source List (BSL) but not formally
included in the First EUVE Source Catalog (FESC) because they did not meet the
criteria for inclusion.
EXOFOT - EXOSAT Final Observation Tape
Log
The EXOFOT database contains the log of the EXOSAT final observation tapes
(FOTs). This database helps to locate the desired EXOSAT data file within the
HEASARC anonymous FTP account. The database itself contains a minimum number of
parameters regarding the observation which correspond to the first 255 bytes
which label the FOT. Those parameters are target name, experiment, and start
and stop time. Other parameters in the database are more related to the
organization of the archive.
The European X-ray Observatory Satellite (EXOSAT) was operational from May 1983
to April 1986 and in that time made 1780 detailed observations of a wide
variety of astronomical objects. The scientific payload consists of two energy
telescopes (LEIT), a medium energy proportional counter (ME), and a gas
scintillator proportional counter (GSPC).
The data acquired for the four instruments were distributed to observers as FOT
(Final Observation Tape) in a form of 1600 BPI tape. A single FOT contains data
for only one instrument, and a FOT (observation) could consist of more than one
1600 BPI tape, which generally contained data from the pointed observation plus
part of the in-going and out-going slews (only for the GSPC and ME
instruments).
Since 1992, the total amount of ~8643 tapes (1600 BPI), for a volume of 150
Gbytes of data, has been archived at ESRIN/ESA, on an optical disk, by the ESIS
project. An exact copy has been given to HEASARC/GSFC (Greenbelt, MD, USA).
From ESRIN the data arrived at HEASARC on magnetic media, each containing a
number of FOTs. At HEASARC the magnetic tapes were read into a jukebox
organized into directories named from the magnetic tape number delivered from
ESRIN.
ESIS could not recover and archive the complete mission because some of the
earliest 1600 BPI tapes (now over ten years old) were badly damaged. Currently
there are about 50 observations for which data recovery was not possible.
Letters have been sent to the original PIs of those observation in the hope
that their copies of the data were better maintained. For a number of
observations (in particular for the early ones), more than one FOT is
available. This is because the FOT was regenerated for various reasons. The
record seems to be missing as to which is the correct FOT.
EXOGPS - EXOGPS Source Catalog
This catalog is based on information contained in Warwick et al (1988),
MNRAS, 232, 551.
The distribution of 2-6 keV x-ray emission in the galactic plane in the first
and fourth galactic quadrants has been measured in a series of scanning
observations with the medium-energy progportional counters on EXOSAT. The
results are presented as contour maps and in the form of a catalogue of 70
discrete sources.
HRIDEEP - HRI Deep Survey Source
Positions
This database contains primary HRI source parameters for the 202 HRI sources
found in the Einstein Deep Survey. The Einstein Deep Survey program (EDS)
consists of very deep X-ray exposures in selected regions of the sky at high
galactic latitude. The main purposes of the survey are to investigate the
nature of the extragalactic X-ray background through direct source counts at
very low flux levels and to study the nature of the very faint X-ray sources
which comprise a significant fraction, if not all, of the soft X-ray
background.
HIIREGION - Sharpless H II Region Catalog
The HIIREGION database is derived from data contained in the Sharpless
Catalogue of H II regions. The original catalogue was published in 1959 in the
Astrophysical Journal Supplement Series (number 41, pages 257-280). The
original card deck was in the 026 punch and this was converted to a 029 deck.
Many of the quantities in this version of the catalogue were not in the
published catalogue. The epochs of the precessed equatorial coordinates were
determined empirically from the data as given on the computer cards.
HSTOBS - HST Observation Catalog
The HSTOBS database is created from an ASCII listing compiled from the Hubble
Space Telescope Data Archive and Proposal databases. It provides a summary of
all approved HST observations, including already completed observations and
those which are planned to be executed as part of Cycle 4 or which are reserved
for execution in Cycle 5 Guaranteed Time Observer (GTO) programs.
HSTEXP - HST Exposure Catalog
The HSTEXP database is created from an ASCII listing compiled from the Hubble
Space Telescope Data Archive database. It provides a summary of completed HST
science observations.
IPCDEEP - IPC Deep Survey Source
Parameters
IPCDEEP is created from a table containing basic source parameters for each of
the 178 IPC sources detected by the Einstein Deep Survey. The Einstein Deep
Survey program (EDS) consists of very deep X-ray exposures in selected regions
of the sky at high galactic latitude. The main purposes of the survey are to
investigate the nature of the extragalactic X-ray background through direct
source counts at very low flux levels and to study the nature of the very faint
X-ray sources which comprise a significant fraction, if not all, of the soft
X-ray background.
MCG - Morphological Catalogue of Galaxies
The MCG database contains the Morphological Catalogue of Galaxies, a
compilation of information for approximately 34,000 galaxies found and examined
on the Palomar Observatory Sky Survey (POSS). Individual identifiers are
assigned for about 29,000 galaxies and information on the remaining 5000 is
present in the extensive notes of the published catalogs (Vorontsov-Velyaminov
et al. 1962-1968). The catalog is structured according to the POSS zones and
is numbered from +15 (corresponding to +90 deg) to +01 (+06 deg zone) and +00
(equatorial zone) to -05 (-30 deg zone); the fields are numbered with
increasing right ascension. The original goal of the compilation was to be
complete for galaxies brighter than magnitude 15.1, but the final catalog lists
many objects considerably fainter.
NGC2000 - NGC 2000.0 Catalogue
NGC 2000.0 is a modern compilation of the New General Catalogue of Nebulae and
Clusters of Stars (NGC), the Index Catalogue (IC), and the Second Index
Catalogue compiled by J. L. E. Dreyer (1888, 1895, 1908). The new compilation
of these classical catalogs is intended to meet the needs of present-day
observers by reporting positions at equinox 2000.0 and by incorporating the
corrections reported by Dreyer himself and by a host of other astronomers who
have worked with the data and compiled lists of errata. The object types given
are those known to modern astronomy.
OSTARS - Galactic O-Type Stars Catalog
OSTARS database is based on the information contained in the Catalog of
Galactic O-Type Stars (Garmany, Conti, and Chiosi 1982), a compilation from the
literature of all O-type stars for which spectral types, luminosity classes,
and UBV photometry exist. Most of the entries come from Cruz-Gonzalez, et al.
(1974) and Humphreys (1978), with additional stars from Garrison and Kormendy
(1976); Garrison, Hiltner, and Schild (1977); Garrison and Schild (1979);
Feinstein, Marraco, and Muzzio (1973); Feinstein, Marraco, and Forte (1976);
and Moffat, FitzGerald, and Jackson (1979). The catalog contains 765 stars, for
each of which designation (HD, DM, etc.), spectral type, V, B-V, cluster
membership, Galactic coordinates, and source references are given. In
addition, the authors have included derived values of absolute visual and
bolometric magnitudes and distances.
PLNEBULAE - Strasbourg Galactic Planetary
Nebulae
The PLNEBULAE database is designed to provide a list of data concerning all
known planetary nebulae (PN). The total number is 1455 including 1036 listed
in the Perek and Kohoutek (PK) catalogue (1967), and including doubtful cases.
The additions come from Sanduleak (1975, 1976); Acker and Marcout (1977);
Weinberger (1977); Peterson (1977); Kohoutek (1978); Stephenson (1978); Allen
(1979); Murdin et al. (1979); Van den Bergh (1979); and Purgathofer and
Weinberger (1980).
PMN - PMN Southern & Tropical Surveys
The PMN database contains data from the PMN Southern and Tropical surveys. The
data is measured at a frequency of 4850 Hz, using the Parkes 64 m radio
telescope with the NRAO multibeam receiver. These surveys cover 4.51 sr and
contain 36,640 sources to a flux limit that is typically about 35 mJy but
varies as a function of declination. They increse the number of known sources
in the regions surveyed by approximately a factor of 5.
PPM - Positions and Proper Motions
The PPM database is the Catalog of Positions and Proper Motions. It combines
the two catalogs for PPM North and PPM South and the Bright Stars Supplement to
PPM. PPM North gives positions and proper motions of 181,731 stars north of
-2.5 degrees declination. PPM South gives positions and proper motions of
197179 stars south of about -2.5 degrees declination. The star density of PPM
South is slightly higher than that of its northern counterpart and the accuracy
of the present-epoch positions is roughly twice that in the north.
The Bright Stars Supplement makes the PPM catalogues complete down to V=7.5
mag. For this purpose it lists all missing stars brighter than V=7.6 mag that
could be found in published star lists. Their total number is 321. Only 5 of
them are brighter than V=3.5.
ROSATSRC - ROSAT PSPC Sources from
REV0/1 Public Pointings
This catalog contains ROSAT point sources detected by the standard analysis
system SASS. The catalog is based on the public PSPC observations.
During the ROSAT workshop at MPE on October 26, 1994, Wolfgang Voges announced
on behalf of the ROSAT Consortium (MPE-Garching, GSFC/SAO-US, and
WFC-Consortium-UK) the public release of "THE FIRST ROSAT SOURCE CATALOGUE OF
POINTED OBSERVATIONS WITH THE PSPC." This catalogue contains 50,408 sources
from 2876 pointed observations. For each source the following properties are
provided: the observation number, the ROSAT name, the position in equatorial
and in galactic co-ordinates, four positional errors (intrinsic, systematic,
boresight, and total), the source count-rate and its error, the background
countrate, exposure time, hardness-ratios HR1 and HR2 and their errors, extent
and likelihood of extent, likelihoods of the map-detect algorithm and of the
maximum-likelihood detection algorithm, flags to indicate in which energy band
and by what algorithm the source was detected, the detection cell size, the
off-axis radius, the distances to the nearest rib and source (before and after
removal of ambiguous sources), and a source confusion flag (set if another
source is within 2.1*FWHM of the point-spread function).
This catalogue contains observations which have been performed until the end of
May 1993 and which are in the public archive. A visual inspection of all soft
and hard images, and an automated screening process on the original so called
master source lists (MASOL), have been used to remove confused sources and 124
observations with too crowded regions and regions of high surface brightness
diffuse emission. The resulting 50,408 sources have a likelihood of at least
10, corresponding to a rate of accidental detections of about 1 percent. This
data base contains 80% of all PSPC observations. Since the acceptance criteria
were rather conservative a total number of about 70,000 X-ray sources detected
during the pointed PSPC observation phase can be expected.
ROSDISTRIB - ROSAT Distributed Data
The ROSDISTRIB database contains the list of US and German ROSAT observations
for which data have been distributed to the PI, including those data sets which
have become available to the public. ROSDISTRIB is updated weekly, or as new
data sets are distributed to PI's.
ROSPUBLIC - ROSAT Public Archive List
The ROSPUBLIC database contains the list of public US and European ROSAT
observations which have been released to the US archive. ROSPUBLIC is updated
as new data sets are released for public use. ROSPUBLIC currently contains all
data released to the US archive through 12 Oct 1994. This includes the
following:
US data public through Sep 1994
German/UK data public through May 1994
VERON91 - Quasars and AGN
The VERON91 database is the 5th edition of Veron-Cetty & Veron "A Catalogue
of Quasars and Active Galactic Nuclei (1991)." It contains data for quasars,
active galaxies, and BL Lac objects.
VLANEP - VLA North Ecliptic Pole Survey
The VLANEP database contains the VLA-NEP survey of 29.3 square degrees around
the North Ecliptic Pole mapped with the VLA at 1.5 GHz in the
`C-configuration`. The database contains 2435 radio sources with flux
densities ranging from 0.3 - 1000 mJy, including over 200 fainter than 1 mJy.
Source positions have been corrected for instrumental effects, and most
positions are accurate to less than 2 arcseconds.
WFCPOINT - ROSAT WFC Observations
The WFCPOINT database contains the current list of ROSAT-Wide Field Camera CAL,
PV, and AO phase observations.
For each observation listed in WFCPOINT, the target name, celestial
co-ordinates, sequence number, PI name, and proposal title are given. The date
of the observation, date that the data were distributed, and the date that the
data will be released to the public are also given. The public release date is
nominally 1 year and 14 days after the distribution date; however, because of
some processing problems with a few datasets, the actual release date will be
delayed from the given date. The public flag indicates whether or not a dataset
is currently available for public release.
WGACAT - ROSAT WGA Point Sources
WGACAT is a point source catalogue generated from all ROSAT PSPC pointing
observations from Feb 1991 to March 1994 which were available in the public
archive at HEASARC in September 1994. This catalog has been generated by N.E.
White (HEASARC/GSFC), P. Giommi (ESIS/ESA), and L. Angelini (HEASARC/GSFC), and
is a private research effort not related to the official catalog planned by the
ROSAT project. The total number of sequences processed were 2624 and include
all of the US and German/UK public archived data. As more data becomes
available, the catalog will be updated. The catalog currently (Oct 30, 1994)
contains in excess of 50,000 detections, with more than 45,600 individual
sources.
This catalog was generated using an optimized sliding cell detect algorithm in
XIMAGE (first developed for the EXOSAT project). The inner and outer parts of
the images were run separately to maximize the sensitivity to source detection.
This method is very sensitive to finding point sources, but can also find
spurious sources where there is extended emission. We have run a quality check
on the detect output and removed the obvious spurious cases, but users should
carefully check the reality of each source.
Access to the HEASARC Online Service
Via the xray Account
Users can access the HEASARC Online Service by typing
http://heasarc.gsfc.nasa.gov/W3Browse/
From the HEASARC>
prompt, the user can browse any of the (currently) 145 databases by typing
browse database_name. An extensive online help is available by typing
a question mark, ?, at any prompt. Information about the database that
you are browsing is obtained by typing dbhelp. A Users Guide and
Available Databases guide are available by e-mailing Steve Drake at
drake@lheavx.gsfc.nasa.gov.
Via the ftp Account
Users can ftp to legacy.gsfc.nasa.gov to get data or documentation. To access
the ftp account, simply type
ftp legacy.gsfc.nasa.gov
and, when prompted, log on as anonymous (or ftp) with the
password as your e-mail account. Anonymous ftp has no graphical capabilities,
but is a quick and easy way to transfer data if you know what you're looking
for. To list the contents of a directory, type ls or dir, and
to change directory, type cd dir_name.
Via the WWW
The HEASARC Online Service is available via the World Wide Web (WWW). The URL
for the HEASARC is
http://heasarc.gsfc.nasa.gov
and the Browse area can be access by clicking on the Browse button at the top
or bottom of the HEASARC Home Page. Searches by RA and Dec and by name are the
only searches enabled on the WWW at this time. The advantage to the WWW is that
the user can view the data before transferring it.
Via Gopher
Users can connect to the HEASARC via a Gopher by typing
gopher legacy.gsfc.nasa.gov
(or gopher heasarc.gsfc.nasa.gov).
The advantages of a gopher are that the user need not know details such as the
node name or e-mail address of other internet services, the ability to
immediately display files before transferring, and the ability to do searches
in a directory for files with names containing a specified alphanumeric
string.
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