Issue |
A&A
Volume 530, June 2011
|
|
---|---|---|
Article Number | A74 | |
Number of page(s) | 4 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/201116794 | |
Published online | 12 May 2011 |
The puzzling temporally variable optical and X-ray afterglow of GRB 101024A
1 ASI Science Data Center, via Galileo Galilei, 00044 Frascati (RM), Italy
e-mail: bruce.gendre@asdc.asi.it
2
University of Western Australia, School of Physics/ICRAR, W.A. 6009 Crawley, Australia
3
University of Western Australia, School of Physics, W.A. 6009 Crawley, Australia
4
Institut de Recherche en Astrophysique et Planetologie, 9 avenue du colonel Roche, 31028 Toulouse, France
5
Observatoire de Haute Provence (CNRS), 04780 Saint Michel l’Observatoire, France
6
Centre for Backyard Astrophysics, 3842 Churchill Victoria, Australia
Received: 27 February 2011
Accepted: 11 April 2011
Aims. We present the optical observations of the afterglow of the Swift burst GRB 101024A and try to reconcile these observations with the X-ray afterglow data of GRB 101024A using current afterglow models
Methods. We employ early optical observations, using the Zadko Telescope combined with X-ray data, to compare them with the reverse shock/forward shock model.
Results. The early optical light curve reveals a very unusual steep decay index of α ~ 5. This is followed by a flattening and possibly a plateau phase coincident with a similar feature in the X-ray. We discuss these observations in the framework of the standard reverse shock/forward shock model and energy injection. The plateau phase might also be the signature of the formation of a new magnetar.
Key words: gamma-ray burst: general
© ESO, 2011
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