A Search for Gamma-Ray Transients in the Galactic Center Region with OSSE

Details A Search for Gamma-Ray Transients in the Galactic Center Region with OSSE A Search for Gamma-Ray Transients in the Galactic Center Region with OSSE

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.2909g&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #29.09; Bulletin of the American Astronomical Society, Vol. 25, p.1337

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Oriented Scintillation Spectrometer Experiment on board the Compton Gamma Ray Observatory has carried out approximately 160 days of observations in the Galactic center region since the launch of the spacecraft in 1991 April. These observations represent a substantial data base for the study of transient gamma-ray line emission from the important central region of the Galaxy. Several experiments have reported such phenomena, but not all of them have had the extensive observing time in the Galactic center that OSSE has. In order to help determine whether or not this interesting behavior can be confirmed, we have undertaken a search of the OSSE Galactic center data for evidence of transient gamma-ray line sources on time scales much shorter than the ones used in our previous time-averaged analyses of these data. The expected OSSE 3sigma sensitivity to transient line emission in the .05--10 MeV range from the Galactic center is roughly .5--1 times 10(-3) \ gamma cm(-2) s(-1) for variability time scales from one day down to ~ 5400 s (one CGRO orbit). The preliminary results of our search will be presented.

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