The shortest time scale: A 200 microsecond rise time

Details The shortest time scale: A 200 microsecond rise time The shortest time scale: A 200 microsecond rise time

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..266w&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 266-270 (1998).

Physics

1

Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray

Scientific paper

We present here the results of the first search for submillisecond variability in gamma-ray bursts. We have examined 20 of the brightest BATSE bursts for isolated flares and for low amplitude fluctuations. We find that GRB970229 has a flare with a rise time of 200+/-30 μs and fall time of 300+/-50 μs. In addition we find all bursts to show activity on time scales of less than 30 ms. Typical bursts show activity on the time scale of a millisecond, while 30% of the burst show sub-millisecond activity. This result can be used to prove that the emission regions are patchy and that any spherical symmetry in the shell must be broken.

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