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Issue A&A
Volume 404, Number 3, June IV 2003
Page(s) 815 - 818
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030121



A&A 404, 815-818 (2003)
DOI: 10.1051/0004-6361:20030121

Observational constraints on the afterglow of GRB 020531

A. Klotz1, M. Boër1 and J. L. Atteia2

1  Centre d'Étude Spatiale des Rayonnements, Observatoire Midi-Pyrénées (CNRS-UPS), BP 4346, 31028 Toulouse Cedex 04, France
2  Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées (CNRS-UPS), 14 avenue E. Belin, 31400 Toulouse, France

(Received 20 November 2002 / Accepted 17 January 2003)

Abstract
We present the data acquired by the TAROT automated observatory on the afterglow of GRB 020531. Up to now, no convincing afterglow emission has been reported for this short/hard GRB at any wavelength, including X-ray and optical. The combination of our early limits, with other published data allows us to put severe constraints on the afterglow magnitude and light curve. The limiting magnitude is 18.5 in R band, 88 min after the GRB, and the decay slope power law index could be larger than 2.2.


Key words: gamma-ray : bursts

Offprint request: A. Klotz, klotz@cesr.fr

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© ESO 2003


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