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GRB 050509b: the elusive optical/nIR/mm afterglow of a short-duration GRB

A. J. Castro-Tirado·A. de Ugarte Postigo·J. Gorosabel·T. Fatkhullin·V. Sokolov·M. Bremer·I. Márquez·A. J. Marin·S. Guziy·M. Jelinek·P. Kubanek·R. Hudec·S. Vitek·T. J. Mateo Sanguino·A. Eigenbrod·M. D. Pérez-Ramírez·A. Sota·J. Masegosa·F. Prada·M. Moles
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Abstract

We present multiwavelength (optical/near infrared/millimetre) observations of a short duration gamma-ray burst detected by Swift (GRB 050509b) collected between 0 seconds and ~18.8 days after the event. No optical, near infrared or millimetre emission has been detected in spite of the well localised X-ray afterglow, confirming the elusiveness of the short duration events. We also discuss the possibility of the burst being located in a cluster of galaxies at z= 0.225 or beyond. In the former case, the spectral energy distribution of the neighbouring, potential host galaxy, favours a system harbouring an evolved dominant stellar population (age ~360 Myr), unlike most long duration GRB host galaxies observed so far, i.e. thus giving support to a compact binary merger origin. Any underlying supernova that could be associated with this particular event should have been at least 3 magnitudes fainter than the type Ib/c SN 1998bw and 2.3 magnitudes fainter than a typical type Ia SN.

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A. J. Castro-Tirado, A. de Ugarte Postigo, J. Gorosabel, T. Fatkhullin, V. Sokolov, M. Bremer, I. Márquez, A. J. Marin, S. Guziy, M. Jelinek, P. Kubanek, R. Hudec, S. Vitek, T. J. Mateo Sanguino, A. Eigenbrod, M. D. Pérez-Ramírez, A. Sota, J. Masegosa, F. Prada, M. Moles. 2005-06-29. GRB 050509b: the elusive optical/nIR/mm afterglow of a short-duration GRB. https://doi.org/10.1051/0004-6361%3A200500147

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