A common feature of long GRB early afterglow

Details A common feature of long GRB early afterglow A common feature of long GRB early afterglow

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..62u&link_type=abstract

Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,

Physics

Scientific paper

Utilizing East Asian GRB Follow-up Observation Network (EAFON) we haveobserved 55 GRB optical afterglows and detected 15 early optical afterglowbehavior including two short GRBs in multi-bands. We have found a commonfeature in long GRB early afterglow light curves. These early light curvesshow re-brightening and/or plateau phase around 0.1 days (2.4hours) afterbursts. Combine with other prompt optical observations and X-raydata, overall behavior of thesemulti-band light curves may be interpreted in terms of the sum of twoseparate components, one showing a monotonic decay from prompt while theother having a rising and a falling phase. These results imply that promptoptical emission continue until 0.1 days and afterglow components dominatethan prompt emission around 0.1 days.

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