[vsnet-grb-info 17504] GRB 160121A: TSHAO optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18933
SUBJECT: GRB 160121A: TSHAO optical observation
DATE:    16/01/24 21:29:54 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin 
(Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) 
report on behalf of a larger GRB follow-up collaboration:

We observed the field of the Swift GRB 160121A (Hagen  et al., GCN 
18912) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical 
Observatory starting on Jan. 22 (UT) 16:17:07.  We obtained several 
images in R filter. We do not detect afterglow  (Oates et al., GCN 
18917; Mazaeva et al., GCN 18920) in a combined image. Preliminary upper 
limit is following

Date       UT start    t-T0     Filter  Exp.    OT     UL (3 sigma)
                        (mid, days)      (s)

2015-01-22 16:17:07    1.13572  R       30*180  n/d    21.2


The photometry is based on nearby USNO-B1.0 stars (see GCN 18920).