On the relative frequency of gamma-ray bursts with peaks in νfν above ~1 MeV

Details On the relative frequency of gamma-ray bursts with peaks in νfν above ~1 MeV On the relative frequency of gamma-ray bursts with peaks in νfν above ~1 MeV

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..314h&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 314-318 (1998).

Physics

3

Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray, Spectroscopy And Spectrophotometry, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

Instruments such as BATSE which trigger on GRB emissions at energies around 100 keV will miss some GRBs with very hard spectra. We searched >9 yr of data from the SMM Gamma Ray Spectrometer for such GRBs. An earlier search in the 0.35-0.8 MeV band yielded 177 GRBs, but a search at 0.8-10 MeV found only 2 new ones. A careful examination of the threshold conditions for detecting 0.8-10 MeV events allowed us to calculate the frequency of GRBs as a function of the spectral peak in νfν (≡ burst hardness H). The frequency distribution (relative to H=0.5 MeV) is approximately flat up to H~=2 MeV but falls sharply for harder bursts (by a factor >=5). There is no large undiscovered population of `MeV bursts.'

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