Earliest Detection of the Optical Afterglow of GRB 030329 and its Variability

Details Earliest Detection of the Optical Afterglow of GRB 030329 and its Variability Earliest Detection of the Optical Afterglow of GRB 030329 and its Variability

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..727..307s&link_type=abstract

GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY: Gamma-Ray Burst Symposium. AIP Conference Proceedings, Volume 727, pp. 307-311 (2004).

Computer Science

1

Gamma-Ray Sources, Gamma-Ray Bursts, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

We report the earliest detection of an extremely bright optical afterglow of the gamma-ray burst GRB 030329 using a 30 cm telescope at the Tokyo Institute of Technology (Tokyo, Japan). Our observation started 67 minutes after the burst and continued for two succeeding nights. Combining our data with those reported in GCN Circulars, we find that the early afterglow light curve of the first half day is described by a broken power-law (~ t-α) function with indices α1 = 0.88 +/- 0.01 (0.047 days < t < tb1), α2 = 1.18 +/- 0.01 (tb1 < t < tb2), and α3 = 1.81 +/- 0.04 (tb2 < t < 1.2 days), where tb1 ~ 0.26 days and tb2 ~ 0.54 days, respectively. The change of the power-law index at the first break at t ~ 0.26 days is consistent with that expected from a ``cooling break''.

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