Faint gamma-ray bursts and other high-energy transients detected with BATSE

Details Faint gamma-ray bursts and other high-energy transients detected with BATSE Faint gamma-ray bursts and other high-energy transients detected with BATSE

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........16k&link_type=abstract

Thesis (PhD). MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Source DAI-B 60/10, p. 5114, Apr 2000, pages.

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The Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma Ray Observatory detects gamma-ray bursts (GRBs) and other high-energy astronomical transients using a real-time burst detection system running onboard the spacecraft. This thesis describes a search of the archival BATSE data for GRBs, emission from soft gamma-ray repeaters (SGRs), bursts and flares from X-ray binaries, and other transients that were not detected by the onboard system. The search covers six years of the mission, from 1992 December 9.0 to 1997 December 17.0. The search reveals 873 GRB candidates that did not activate the onboard burst detection because they were too faint, because they occurred while the onboard system was disabled for technical reasons, or because their time profile artificially raised the onboard detection threshold. The catalog of these bursts increases the number of GRBs detected with BATSE by 48% during the time period of the search. The intensity distribution of the GRBs detected with the search reaches peak fluxes that are a factor of ~2 lower than could be studied previously. The value of the statistic (in Euclidean space) for these bursts, 0.177 +/- 0.006, is the lowest so far obtained for a global sample of GRBs. The differential peak flux distribution is consistent with cosmological models in which the co-moving GRB rate approximately traces the star-formation history of the Universe. These results suggest that more sensitive detectors are likely to discover relatively few GRBs (of the kind currently known) that are fainter than the BATSE detection threshold. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.)

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