[vsnet-grb-info 12913] GRB 121128A: optical upper limit in Maidanak observatory

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14255
SUBJECT: GRB 121128A: optical upper limit in Maidanak observatory
DATE:    13/03/04 20:09:12 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Pozanenko (IKI), A. Volnova (SAI MSU), A. Sergeev (Institute of Radio 
Astronomy of NASU),  O. Burhonov (UBAI), I. Molotov (KIAM) report on 
behalf of larger GRB follow-up collaboration:

We observed  the field of Swift  GRB 121128A  (Oates et al., GCN 14007) 
with AZT-22 telescope of Maidanak observatory starting on Nov. 30  (UT) 
13:47:48 under mean seeing (FWHM) of about 1 arcsec. We obtained several 
images of 180 s exposure in R  filter.  The optical afterglow
(Oates et al., GCN 14007; Japelj et al., GCN 14008) is not detected in 
our  images. A photometry of the stacked image is based on nearby 
USNO-B1.0 stars:

t_start, T0+ (mid), filter, exp.,   OT,  Upper Limit(3sigma)
(UT)     d                  s

13:47:48 2.37924    R      15x180   n/d  23.7