Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/18566
 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 Links: http://hdl.handle.net/2381/18566http://www.aanda.org/articles/aa/abs/2002/10/aah3165/aah3165.html 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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