Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-06-27
Astron.Astrophys. 439 (2005) L15-L18
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A letters
Scientific paper
10.1051/0004-6361:200500147
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.
Bremer Malcolm
Castro-Tirado Alberto J.
de Ugarte Postigo Antonio
Eigenbrod Alexander
Fatkhullin Timur
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