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Title: Strategies for prompt searches for GRB afterglows: The discovery of the GRB 001011 optical/near-infrared counterpart using colour-colour selection
Authors: Gorosabel, J.
Fynbo, J. U.
Hjorth, J.
Wolf, C.
Andersen, M. I.
Pedersen, H.
Christensen, L.
Jensen, B. L.
Moller, P.
Afonso, J.
Treyer, M. A.
Mallen-Ornelas, G.
Castro-Tirado, A. J.
Fruchter, A.
Greiner, J.
Pian, E.
Vreeswijk, P. M.
Frontera, F.
Kaper, L.
Klose, S.
Kouveliotou, C.
Masetti, N.
Palazzi, E.
Rol, E.
Salamanca, I.
Tanvir, N.
Wijers, R. A. M. J.
van den Heuvel E.
First Published: 1-Mar-2002
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2002, 384 (1), pp. 11-23
Abstract: We report the discovery of the optical and near-infrared counterparts to GRB 001011. The GRB 001011 error box determined by Beppo-SAX was simultaneously imaged in the near-infrared by the 3.58-m New Technology Telescope and in the optical by the 1.54-m Danish Telescope ~ 8 hr after the gamma-ray event. Here we implement the colour-colour discrimination technique proposed by Rhoads (2001) and extend it using near-IR data as well. We present the results provided by an automatic colour-colour discrimination pipe-line developed to discern the different populations of objects present in the GRB 001011 error box. Our software revealed three candidates based on single-epoch images. Second-epoch observations carried out ~3.2 days after the burst revealed that the most likely candidate had faded, thus identifying it with the counterpart to the GRB. In deep R-band images obtained 7 months after the burst a faint ( $R=25.38 \pm 0.25$) elongated object, presumably the host galaxy of GRB 001011, was detected at the position of the afterglow. The GRB 001011 afterglow is the first discovered with the assistance of colour-colour diagram techniques. We discuss the advantages of using this method and its application to error boxes determined by future missions.
DOI Link: 10.1051/0004-6361:20011598
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2002 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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