Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 19469

GRB 160525B: Khureltogot optical upper limit
2016-05-26T18:06:16Z (8 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), S. Schmalz (ISON), A. Volnova (IKI),  N. Tungalag 
(Research Center of Astronomy and Geophysics MAS),   I. Molotov (KIAM),
A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of the GRB 160525B (Krimm et al., GCN  19459) with 
  ORI-40 telescope of Khureltogot observatory starting on May, 25 (UT) 
15:51:26.  We do not detect any source within enhanced Swift-XRT 
position (Beardmore et al., GCN 19463). Preliminary photometry  of  the 
combined image is following

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

2016-05-25  15:51:26   0.29070  clear  60*60  21.0

Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R:
SDSS-DR9_id            R(Lupton)
J095742.79+511301.4    16.17
J095737.78+511402.4    16.43
J095736.76+511019.5    14.87
J095730.61+510914.1    17.74
J095737.35+510856.0    15.01
Looking for U.S. government information and services? Visit