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Issue A&A
Volume 439, Number 3, September I 2005
Page(s) L35 - L38
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500153



A&A 439, L35-L38 (2005)
DOI: 10.1051/0004-6361:200500153

Letter

Early re-brightening of the afterglow of GRB 050525a

A. Klotz1, 2, M. Boër2, J. L. Atteia3, G. Stratta2, 3, R. Behrend4, F. Malacrino3 and Y. Damerdji1, 2

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  LAT, Observatoire Midi-Pyrénées (CNRS-UPS), 14 avenue E. Belin, 31400 Toulouse, France
4  Observatoire de Genève, 1290 Sauverny, Switzerland

(Received 13 June 2005 / Accepted 11 July 2005)

Abstract
We present time resolved optical data acquired by the TAROT automated observatory on the afterglow of GRB 050525a from 6 to 136 min after the GRB. We find evidence for a rapid re-brightening of 0.65 mag of the afterglow at ~33 min after the GRB. The decay slope $\alpha$ is 1.14 $\pm$ 0.07 in the first part and is 1.23 $\pm$ 0.27 after the re-brightening event. The afterglow of GRB 050525a is the third known afterglow that exhibits a re-brightening event beginning at 0.01-0.02 day in the rest time frame.


Key words: gamma-ray: bursts

SIMBAD Objects



© ESO 2005


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