A search for pre- and post-burst emission from well-localized gamma-ray burst locations

Details A search for pre- and post-burst emission from well-localized gamma-ray burst locations A search for pre- and post-burst emission from well-localized gamma-ray burst locations

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9434990e&link_type=abstract

Semiannual Report, period ending Mar. 1994 Alabama Univ., Huntsville, AL. Dept. of Physics.

Astronomy and Astrophysics

Astronomy

Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Rays, Sky Surveys (Astronomy), Time Dependence, Gamma Ray Observatory, Occultation, Spatial Distribution

Scientific paper

We present the results from the first long-term search for nonburst gamma-ray emission from the positions of 70 intense, well-localized bursts. Using the BATSE occultation technique, designed for monitoring of discrete sources, these burst positions were measured in the energy range of approximately 15 keV to 1.8 MeV over a 112 day interval during 1991. None of these 70 locations exhibited detectable emission at or above the level of approximately 5 x 10-9 ergs cm-2 s-1 during the 112 day interval. This level is approximately 1000 times less than the typical intensity of the burst associated with the given location. In addition, 35 intense gamma-ray bursts detected by BATSE were examined in a five day interval centered on the time of detection. We find no compelling evidence that these bursts emit preburst emission or display prompt postburst emission at a level of approximately 5 x 10-9 ergs cm2 s-1 on timescales of approximately 1 hr or longer. The lack of detectable long-term emission or preburst and postburst emission from the positions of gamma-ray bursts has important consequences for a variety of burst production models.

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