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Our knowledge of the intrinsic properties of short duration Gamma-Ray Burstshas relied, so far, only upon a few cases for which the estimate of thedistance and an extended, multiwavelength monitoring of the afterglow have beenobtained. We carried out multiwavelength observations of the short GRB 061201aimed at estimating its distance and studying its properties. We performed aspectral and timing analysis of the prompt and afterglow emission and discussthe results in the context of the standard fireball model. A clear temporalbreak was observed in the X-ray light curve about 40 minutes after the bursttrigger. We find that the spectral and timing behaviour of the X-ray afterglowis consistent with a jet origin of the observed break, although the opticaldata can not definitively confirm this and other scenarios are possible. Nounderlying host galaxy down to R~26 mag was found after fading of the opticalafterglow. Thus, no secure redshift could be measured for this burst. Thenearest galaxy is at z=0.111 and shows evidence of star formation activity. Wediscuss the association of GRB 061201 with this galaxy and with the ACO S 995galaxy cluster, from which the source is at an angular distance of 17'' and8.5', respectively. We also test the association with a possible undetected,positionally consistent galaxy at z~1. In all these cases, in the jetinterpretation, we find a jet opening angle of 1-2 degrees.

A study of the prompt and afterglow emission of the Short GRB 061201