Journal
ASTRONOMY & ASTROPHYSICS
Volume 439, Issue 2, Pages L15-L18Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200500147
Keywords
gamma rays : bursts; techniques : photometric; cosmology : observations
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We present multiwavelength ( optical optical/near infrared infrared/millimetre) observations of a short duration gamma-ray burst detected by Swift ( GRB 050509b) collected between 0 seconds and similar to 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 similar to 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 mag fainter than a typical type Ia SN.
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