[vsnet-grb-info 12855] GRB 121128A: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14201
SUBJECT: GRB 121128A: optical observations
DATE:    13/02/13 16:37:16 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

Yu. Krugly (Institute of Astronomy of Kharkiv National University), 
R.Inasaridze, O. Kvaratskhelia(Abastumani Astrophysical Observatory), 
I. Molotov (KIAM), A. Pozanenko (IKI)  report on behalf of  larger GRB 
follow-up collaboration:

We observed the field of the Swift Swift GRB 121128A (Oates et al., GCN 
14007)with AC-32 (0.7m Maksutov) telescope of Abastumani Observatory, 
starting on Nov. 28 (UT) 15:28. We took several unfiltered images of 300 
s exposure. We detected the afterglow (Oates et al., GCN 14007; Japelj 
et al., GCN 14008) in stacked images. The photometry of a the stacked 
image is based on USNO-B1.0 stars (R2):

Start,    T0+,        Filter,   Exp.,  OT
(UT)      (mid),days

15:27:50  0.4479      none      9x300  20.24 +/- 0.12
16:18:59  0.4853      none      8x300  20.35 +/- 0.16
17:09:58  0.5208      none      8x300  20.38 +/- 0.18
18:01:17  0.5544      none      9x300  20.55 +/- 0.22
18:46:44  0.5871      none      8x300  20.84 +/- 0.36