[vsnet-grb-info 16023] GRB 150110B: Khureltogot optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17305
SUBJECT: GRB 150110B: Khureltogot optical upper limit
DATE:    15/01/17 19:51:52 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of 
Astronomy and Geophysics MAS),  A. Volnova (IKI), I.Molotov (KIAM), A. 
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB GRB 150110B (Evans et al., GCN 17291) with 
ORI-40 telescope of Khureltogot observatory. We obtained several 
unfiltered images on Jan. 10 starting on (UT) 22:31:36.  In a combined 
image of the first 40 frames we  do not detect any optical source within 
  enhanced Swift-XRT position (Beardmore et al., GCN 17294). A 
photometry of the combined image is following

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

2015-01-10  22:31:36  0.03113    none    40*60  19.3


The photometry is based on USNO-B1.0 stars

USNO-B1_id       RA             DEC        R2
1224-0426323     289.294781   +32.470745   13.52
1225-0423392     289.295778   +32.569009   13.80