Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..130k&link_type=abstract
GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed
Astronomy and Astrophysics
Astronomy
Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
We have examined a possible correlation between the decay rate of Epk and the luminosity distance for 15 gamma-ray bursts (GRB), in an attempt to determine if the decay constant (Φo) of the primary pulse within a burst may be used as a distance indicator. We show from physical first principles that the invariant quantity \Fgr od2 should be a constant if the luminosity of GRBs is indeed a standard candle. We find tentative evidence that this quantity may be constant for clean separable FRED pulses, whereas chaotic pulses with unresolved structure do not yield the expected correlation. This is believed to be due to an inevitable overestimating of \Fgr o that occurs when trying to measure the Epk decay rates of overlapping pulses. This method has the potential of yielding distances and hence luminosities of clean GRBs with separable pulses and may be related to the underlying physics of the lag-luminosity correlation.
Kocevski Dan
Liang Edison
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