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Strategies for Prompt Searches for GRB Afterglows: The Discovery of GRB 001011 Optical/Near-Infrared Counterpart Using Colour-Colour SelectionWe report the discovery of the optical and near-infrared counterpart 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. 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 approx. 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 plus or minus 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 boxes determined by future missions.
Document ID
20020022725
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Gorosabel, J.
(Danish Space Research Inst. Copenhagen, Denmark)
Fynbo, J. U.
(European Southern Observatory Garching, Germany)
Hjorth, J.
(Copenhagen Univ. Denmark)
Wolf, C.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Andersen, M. I.
(Oulu Univ. Finland)
Pedersen, H.
(Copenhagen Univ. Denmark)
Christensen, L.
(Copenhagen Univ. Denmark)
Jensen, B. L.
(Copenhagen Univ. Denmark)
Moller, P.
(European Southern Observatory Garching, Germany)
Afonso, J.
(Imperial Coll. of Science, Technology and Medicine London, United Kingdom)
Whitaker, Ann F.
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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