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GCN Circular 12900

Subject

GRB 120118B: optical upper limit

Date

2012-01-27T09:43:39Z (12 years ago)

From

Alina Volnova at SAI MSU <alinusss@gmail.com>

A. Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (KIAM), A.
Pozanenko (IKI) on behalf of  larger GRB follow up collaboration
report:

 We observed the field of the Swift GRB 120118B (Littlejohns et al.,
 GCNs 12852Not found
 
 
, 12854Not found
 
 
) with ORI-40 telescope of Kitab ISON observatory on
 Jan. 18 between (UT) 17:39:55 and 18:10:51. We obtained several
 unfiltered images with exposure of 60 seconds. On the stacked image we
 do not detect a source reported by D'Avanzo et al. (GCN 12870Not found
 
 
). The
 photometry is based on nearby reference stars of USNO-B1.0 (R2
 magnitudes):

 Tstart UT,   T0+,        Filter, Exposure, OT,   UL (3 sigma)
                 (mid, d)            (s)

 17:39:55     0.03127   none   26x60      n/d   19.5