OSSE - CGRO/OSSE Observations
"The Oriented Scintillation Spectrometer Experiment Instrument Description", W.N. Johnson et al. 1993, ApJ Suppl. 86, 693. "Initial Results from OSSE on the Compton Observatory", W.N. Johnson et al. 1993, Astron. & Astrophys. Suppl. 97, 21.
OSSE Spectrum GIF (SPECGIF): A GIF image of the spectrum which can be loaded into your browser for a quick determination if the observation might be of further interest. Not available for all observations. This fit is generated on a power-law model. OSSE XSpec Files (HIXSPEC): XSPEC PHA & RMF files (ARF files are not needed) by detector for this observation. In some cases, this may also include PHA and RMF files generated with the detectors summed. Not available for all observations. OSSE High-Level Quicklook Products (HIQUICKLOOK): A more detailed set of products for a given observation. Contains details of the detector pointing strategy along with notes as to how these high-level data products are generated. A MUST read item for any OSSE observation. OSSE High-Level Summary Spectrum (HISUMMARY): Totalled and rebinned background-subtracted count spectra. Includes the detector response matrix. Not available for all observations. Best used in IGORE. OSSE High-Level Totaled Spectrum (HITOTAL): Total by detector of the background-subtracted count spectra. Includes the detector response matrix. Not available for all observations. Best used in IGORE. OSSE 2-Minute Difference Spectra (HI2MINUTE): Two-minute, background-subtracted count spectra for the specified target. Really only useful for bright sources. Best used in IGORE. OSSE High-Level Daily Spectra (HIDAILY): Background-subtracted count spectra for a given day and detector. Best used in IGORE. OSSE High-Level Processing Products (HIPROCESS): Loads of intermediate products (PostScript plots and text files) generated by the OSSE high-level data product process. OSSE Low-Level Targeted Spectra (TARGSPEC): Raw count spectra. No background subtraction. Best used in IGORE. This would be your starting point for using SPECANAL (see the OSSE Guest Investigator Guide). OSSE Low-Level Non-targeted Spectra (NTARGSPEC): Low-level data products generated by the OSSE shields. Best used in IGORE. OSSE Calibration Data (CALIB): Low-level calibration files. Really only useful if you have an IGORE installation available. OSSE Low-Level Temporal Data (LOTEMP): Pulsar data products. Currently unavailable in FITS. Best used in IGORE. OSSE Low-Level Support Files (SUPPORT): Loads of support data utilized by IGORE. OSSE Telemetry Scalar Data (TELEM): Another OSSE low-level data product. Best used in IGORE.
Because CGRO viewing periods do not end at 0h GMT, there is often a one day 'carryover' located before and after the real viewing period of the target of interest. Check the start and end times to be sure you are selecting the real observation.
There has been some reorganization of the OSSE Data Products compared to that described in Table 4.3-1 (page 38) of Legacy #7.
The CGRO viewing period. The first digit is the phase (or cycle) number. The rest of the string is the sequential number of the observation within that phase.
Alternate viewing period format. Used internally to locate the OSSE low-level data products.
Most common name of the target.
This is the unique observation identifier. For this database table, it is a concatenation of the instrument abbreviation ('O' for OSSE), the viewing period, and target name. It is used by the HEASARC database system to locate the high-level OSSE data products.
Start time of the observation in UTC. For many entries, this is really only accurate to the minute.
The end time of the observation in UTC. For many entries, this is really only accurate to the minute.
The Right Ascension of the target in the default equinox.
The Declination of the target in the default equinox.
The Galactic longitude of the target.
The Galactic latitude of the target.