High-energy spectral evolution in cosmic gamma-ray bursts

Details High-energy spectral evolution in cosmic gamma-ray bursts High-energy spectral evolution in cosmic gamma-ray bursts

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..354s&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 354-358 (1998).

Physics

1

Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray, Spectroscopy And Spectrophotometry

Scientific paper

We have studied spectral evolution at 2 s resolution in 48 strong bursts observed by the Solar Maximum Mission (SMM) Gamma Ray Spectrometer (GRS). Hard-to-soft spectral evolution is observed in individual pulses in 30 of the events; there are no clear instances of soft-to-hard evolution in resolved pulses but hardness appears to track intensity in some events. There is also no consistent trend of softening from one pulse to the next. Twenty of the bursts were observed >4 MeV and these exhibit the same spectral evolution as the full sample. We present in greater detail data from 8 of 14 bursts detected at energies >10 MeV. Pulses observed >10 MeV are generally narrower than they are at 0.3 MeV and they typically exhibit hard-to-soft spectral evolution, although hardness appears to track intensity in two of the events. In two of the bursts, later pulses are either as hard or considerably harder than earlier pulses.

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