[vsnet-grb-info 12467] GRB 120927A: optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13842
SUBJECT: GRB 120927A: optical upper limit
DATE:    12/10/05 18:23:19 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

M. Andreev,  A. Sergeev (Terskol Branch of Institute of Astronomy), A. 
Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:

We observed field of the Swift  GRB 120927A  (Maselli et al. GCN  13822) 
with Zeiss-600 telescope of Mt.Terskol observatory starting on Sep. 28 (UT) 
01:31:05. Several unfiltered images were taken under favorable weather 
conditions. We do not detect any sources in the enhanced XRT error circle 
(Beardmore et al. GCN  13824). Photometry is based on nearby USNO-B1.0 (R2) 
stars:

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

0.1292    none      30x60         n/d     22.0