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 15171

GRB 130903A: ISON-Kislovodsk optical Upper Limits
2013-09-03T13:21:41Z (11 years ago)
Alexei Pozanenko at IKI, Moscow <>
A. Volnova (IKI),  V. Nevskiy (ISON),  I. Molotov (KIAM), A. Pozanenko 
(IKI),  report on  behalf of larger collaboration:

We observed the field of GRB 130903A (INTEGRAL trigger 6930; Mereghetti et 
al. 2013, GCN 15169)  with SANTEL-400AN (0.4-m f/3)  telescope of 
ISON-Kislovodsk observatory.Observations started on  Sep. 09 (UT) 01:11:40, 
i.e. 34 minutes after burst triger.   We obtained  several unfiltered images 
of 100 s exposure. We do not detect any source within 1.5 arcmin of error 
circle localization (Mereghetti et al. 2013, GCN 15169) .  Photometry of 
combined image is following

T_start,                     T0+,       Exp.,   Filter,  UL (3 sigma)
(UT)                          mid (d)    (s)

01:11:40T01:11:40      0.02363  1000    none     >19.6

and based on  SDSS  stars, R (gri -> R  transformations by Lupton 2005):

#   SDSS                      R        Err_R
1  J052835.34-000624.7 15.543 0.013
2  J052817.12-000749.0 14.650 0.012
3  J052841.64-000642.3 14.233 0.013

 Within error circle (Mereghetti et al. 2013, GCN 15169) we note a presence 
of  probable bright galaxy  J052830.20-000723.9 r=19.706
(however marked in SDSS-DR9 as point like object).
Looking for U.S. government information and services? Visit