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 12059

GRB 110530A: optical observations at Mt. Terskol, second epoch
2011-06-01T20:03:28Z (13 years ago)
Alexei Pozanenko at IKI, Moscow <>
M. Andreev, A. Sergeev, I. Sokolov (Terskol Branch of Institute of 
Astronomy), Yu. Bronich (IC AMER of NASU),  A. Pozanenko (IKI) on behalf of 
larger GRB follow up collaboration report:

We observed the optical afterglow  of the Swift   GRB 110530A (D'Avanzo et 
al, GCN 12046) with Zeiss-2000 telescope of Mt.Terskol observatory On May, 
31 between (UT) 21:41-22:11.  At  the place of optical afterglow we detect 
extended object (elongated from SE to NW) with brightness R(gunn) ~ 22.7 
calibrated against  the star USNO-B1.0 1519-0265568 (RA=18 48 15.86, Dec=+61 
56 15.0) and assuming R=16.08.

Coordinates of South-East part of the extended object are  (J2000) 18 48 
16.27   +61 55 45.3  which is ~2" apart from position of the optical 
afterglow (J2000) 18 48 16.39   +61 55 45.16  obtained in our first epoch 
observations (Andreev et al. GCN 12052). The accuracy of  astrometry  is 
about 0.7" in both coordinates. One can suggest  the extended object might 
be a bright host of GRB 110530A.
The finding chart can be found at
Looking for U.S. government information and services? Visit