Rising optical afterglows seen by TAROT
B. Gendre (1), A. Klotz (2), G. Stratta (3), B. Preger (3), L. Piro, (4), A. Pelangeon (5), A. Galli (4), S. Cutini (3), A. Corsi (4), M. Boer, (6), J.L. Atteia ((1) LAM/CNRS/Universite de Provence, (2) CESR/CNRS/UPS, (3), ASDC, (4) IASF-Roma, (5) LATT/CNRS, (6) OHP/CNRS)
TL;DR
This paper analyzes gamma-ray bursts observed by TAROT, focusing on early rising optical afterglows and their multi-component emission, with some showing X-ray flares and others smooth X-ray light curves.
Contribution
It provides the first multi-wavelength analysis of early optical rising afterglows in gamma-ray bursts, highlighting the necessity of multi-component emission models.
Findings
Early optical rises last a few hundred seconds.
Some bursts show X-ray flares during optical rise.
Multi-component emission explains optical and X-ray behaviors.
Abstract
We present the multi-wavelength study of those gamma-ray bursts observed by TAROT. These events are characterized by the presence at early time of a rising in their optical light curves lasting a few hundred of seconds. In one case (GRB 060904B), a flare occurs at similar time in the X-ray band, while in the other cases the X-ray light curves appear smooth during the optical rise. We investigate the possible nature of this behavior and conclude th at a multi-component emission is mandatory to explain the optical-to-X-ray afterglow.
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Taxonomy
TopicsOcular and Laser Science Research · Advanced Optical Sensing Technologies · Laser-Matter Interactions and Applications