Volume 439, Number 3, September I 2005
|Page(s)||L35 - L38|
|Published online||12 August 2005|
Letter to the Editor
Early re-brightening of the afterglow of GRB 050525a
CESR, Observatoire Midi-Pyrénées (CNRS-UPS), BP 4346, 31028 Toulouse Cedex 04, France e-mail: email@example.com
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
Accepted: 11 July 2005
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 α is 1.14 ± 0.07 in the first part and is 1.23 ± 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
© ESO, 2005
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