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Issue A&A
Volume 451, Number 3, June I 2006
Page(s) L39 - L42
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20065158



A&A 451, L39-L42 (2006)
DOI: 10.1051/0004-6361:20065158

Letter

Continuous optical monitoring during the prompt emission of GRB 060111B

A. Klotz1, 2, B. Gendre3, G. Stratta2, 4, J. L. Atteia4, M. Boër2, F. Malacrino4, Y. Damerdji1, 2 and R. Behrend5

1  CESR, Observatoire Midi-Pyrénées (CNRS - UPS), BP 4346, 31028 Toulouse Cedex 04, France
    e-mail: klotz@cesr.fr
2  Observatoire de Haute-Provence, 04870 Saint Michel l'Observatoire, France
3  IASF - Roma/INAF, via fosso del cavaliere 100, 00133 Roma, Italy
4  LATT, Observatoire Midi-Pyrénées (CNRS - UPS), 14 avenue E. Belin, 31400 Toulouse, France
5  Observatoire de Genève, 1290 Sauverny, Switzerland

(Received 8 March 2006 / Accepted 28 March 2006 )

Abstract
Aims.We present the time-resolved optical emission of GRB 060111B during its prompt phase, measured with the TAROT robotic observatory. This is the first time that the optical emission from a gamma-ray burst has been continuously monitored with a temporal resolution of a few seconds during the prompt gamma-ray phase.
Methods.The temporal evolution of the prompt optical emission at the level of several seconds is used to provide a clue to the origin of this emission.
Results.The optical emission was found to decay steadily from our first measure, 28 s after the trigger, in contrast to the gamma-ray emission, which exhibits strong variability at the same time. This behaviour strongly suggests that the optical emission is due to the reverse shock.


Key words: gamma-rays: bursts

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© ESO 2006


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