A search for nonburst emission from the positions of well-localized gamma-ray bursts

Details A search for nonburst emission from the positions of well-localized gamma-ray bursts A search for nonburst emission from the positions of well-localized gamma-ray bursts

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425..776h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 425, no. 2, p. 776-781

Astronomy and Astrophysics

Astrophysics

8

Gamma Rays, Neutron Stars, Stellar Models, Stellar Occultation, Angular Distribution, Black Body Radiation, Emission Spectra, Gamma Ray Observatory, Neutrinos, Positron Annihilation, Spectral Energy Distribution

Scientific paper

In this 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 Burst and Transient Source Experiment (BATSE) occultation technique, designed for monitoring of discrete sources, these burst positions were measured in the energy range of approximately 15 keV - 1.8 MeV over a 112 day interval during 1991. None of these 70 locations exhibited detectable emission at or avove the level of approximately 5 x 10-9 ergs/sq cm/s 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 5 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/sq cm/s on timescales of approximately 1 hr or longer. The lack of detectable long-term emission or pre- and postburst emission from the positions of gamma-ray bursts has important consequences for a variety of burst production models.

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