Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8518942s&link_type=abstract
Unknown
Physics
Gamma Ray Bursts, Periodic Variations, Brightness, Light (Visible Radiation), Luminosity, Monte Carlo Method, Time
Scientific paper
Three optical transients have been found which are associated with gamma-ray bursters (GRBs). The deduced recurrence timescale for these optical transients (tauopt) will depend on the minimum brightness for which a flash would be detected. A detailed analysis using all available data of tauopt as a function of E(gamma)/E(opt) is given. For flashes similar to those found in the Harvard archives, the best estimate of tauopt is 0.74 years, with a 99% confidence interval from 0.23 years to 4.7 years. It is currently unclear whether the optical transients from GRBs also give rise to gamma-ray events. One way to test this association is to measure the recurrence timescale of gamma-ray events taugamma. A total of 210 gamma-ray error boxes were examined and it was found that the number of observed overlaps is not significantly different from the number expected from chance coincidence. This observation can be used to place limits on taugamma for an assumed luminosity function. It was found that taugamma is approx. 10 yr if bursts are monoenergetic. However, if GRBs have a power law luminosity function with a wide dynamic range, then the limit is taugamma 0.5 yr. Hence, the gamma-ray data do not require taugamma and tauopt to be different.
Cline Thomas L.
Schaefer Bradley E.
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