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 13995

GRB 121125A: LOAO Observation
2012-11-25T16:47:57Z (11 years ago)
Myungshin Im at Seoul Nat U <>
M. Im (CEOU/SNU) and Y. Urata (NCU) on behalf of EAFON.

  We observed the field of GRB 121125A 
(Barlow et al., GCN 13993) in B and R filters using 
the 1-m telescope at Mt. Lemmon observatory in Arizona, US.

  The observation started at 2012-11-25 12:24:27 UT, 
or about 3.87 hours after the BAT alert, and continued for
about 30 min. We identify an object in stacked images of 
both B and R at

  RA=15:14:06.586, Dec=55:18:47.95 with rms error of 0.6".

  This is consistent with the UVOT coordinate of
the afterglow candidate reported in Barlow et al.
  The object has R-band magnitude of R = 19.29 +- 0.14 mag,
calibrated against R2 magnitude (16.13 mag) of a USNO-B1 star 
at RA=15:14:07.14, Dec=+55:18:40.30. Combined with the result
from Yurkov et al. (GCN 13994) and Barlow et al., our result
reveals a fading behavior of the object, thus we identify 
the object to be the afterglow of GRB 121125A.

  We thank the LOAO operator, Jae-Hyuk Yoon for performing 
the observation.
Looking for U.S. government information and services? Visit