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CHANDRAO - Chandra Proposals |
HEASARC Archive |
The PVC phase was during the first few months of the CXO mission; some of the calibration observations that are for monitoring purposes will be performed in later mission cycles. All calibration data (entries with Type = CAL in this database) are placed immediately into the CXO public data archive at the Chandra X-Ray Observatory Center (CXC); please see the Web page at http://asc.harvard.edu/ for more information on the CXC data archive). GTO observations during Cycle 1 or 2 will occupy 100% of months 3-4, 30% of months 5-22, and 15% of the available time for the remainder of the mission. Guaranteed Time Observers will have the same proprietary data rights as General Observers (i.e., their data will be placed in the public CXC archive 12 months after they have received the data in usable form). More information on these targets and observations is available at the CXC web site at http://asc.harvard.edu/.
This HEASARC database is recreated on a weekly basis by querying the CXC Target Search Form webpage at http://asc.harvard.edu/targets/
Sequence_Number
The sequence number to which the observation corresponds
(assigned by CXC).
Prop_Number
The proposal number to which the target corresponds
(assigned by CXC).
Obs_ID
A unique Chandra observation identifier (assigned by CXC).
Cycle
The cycle number in which the proposal to observe the particular
target was submitted. Note that any observations which the CXC have not
assigned proposal numbers have been defaulted to a value of 0 for this
parameter in this HEASARC database.
Type
There are five general types of target: those accepted in a General
Observer (GO) proposal (type = 'GO'), those accepted in a Guaranteed Time
Observing (GTO) proposal (type ='GTO'), those used for a Calibration
observation (type = 'CAL'), those accepted as Targets of Opportunity (type =
'TOO'), and those observed as Director's Discretionary Time (type = 'DDT').
Please note that some DDT targets may have been designated as TOO targets.
PI
The last name of the Principal Investigator. Notice that this is not
always an unambiguous identifier, since there are a number of last names
(e.g., Drake and White) which are shared by more than one astronomer. If
in doubt, it is recommended that that the CXC website be consulted,
e.g., http://cxc.harvard.edu/target_lists/cycle1/abstracts_cyc1.html lists
the full PI name for all accepted Cycle 1 programs.
Name
The source designation or target name as provided by the Principal
Investigator (PI).
RA
The right ascension in the specified equinox. The CXC table from
which this database was created listed positions in J2000 coordinates,
with the RA listed to the nearest 0.01 seconds of time. Objects with no
specific positional information available, such as TOOs for particular
classes of phenomena such as GRBs and black hole transients have been
assigned 0 RA and Declination in the default equinox (2000 for the
Web-based Browse system, 1950 for the captive account BROWSE system).
Dec
The declination in the specified equinox. The CXC table from
which this database was created listed positions in J2000 coordinates,
with declination listed to the nearest 0.01 arcsecond. Objects with no
specific positional information available, such as TOOs for particular
classes of phenomena such as GRBs and black hole transients have been
assigned 0 RA and Declination in the default equinox (2000 for the
Web-based Browse system, 1950 for the captive account BROWSE system).
LII
The galactic longitude. Objects with no specific positional
information available, such as TOOs for particular classes of phenomena such
as GRBs and black hole transients have been assigned 0 LII and BII.
BII
The galactic latitude. Objects with no specific positional
information available, such as TOOs for particular classes of phenomena such
as GRBs and black hole transients have been assigned 0 LII and BII.
Detector
The detector requested for the exposure. There are 2 focal-plane
scientific instruments, the AXAF CCD Imaging Spectrometer (ACIS) and the High
Resolution Camera (HRC). The ACIS has 2 arrays of CCDs: the ACIS imaging
array (ACIS-I) is optimized for imaging wide fields, while the ACIS
spectroscopic array (ACIS-S) is optimized for grating spectroscopy and for
imaging smaller fields. The HRC consists of 2 microchannel plate array which
are used as the primary detection devices: the HRC-I is optimized for direct
imaging, while the HRC-S is optimized for imaging the dispersed flux from the
Low Energy Transmission Grating (LETG). Thus, there are 4 possible detectors:
ACIS-I, ACIS-S, HRC-I, and HRC-S.
Grating
The grating requested for the exposure. There are 2 objective
transmission gratings: the High Energy Transmission Grating (HETG) and the
Low Energy Transmission Grating (LETG). The ACIS-S detector will normally be
used to read out the HETG spectra, while then HRC-S detector will normally be
used to read out the LETG spectra. Thus, there are 3 possible grating
selections: LETG, HETG, and NONE (i.e., no grating requested).
Exposure
The approved exposure time in kiloseconds (ksec). The actual
exposure time may be somewhat different than the approved exposure time, in
general.
Date_Observed
The date on which the observation was made, if available.
Status
The status of the observation. Possible values are Unobserved,
Scheduled, Partially Observed, Observed or Archived.