GCN Circular 11923
Subject
GRB 110411A : Xinglong TNT OT candidate
Event
Date
2011-04-12T09:03:58Z (15 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L.P. Xin, Z. X. Ling, Y.L. Qiu, J.Y. Wei, J. Wang,
J.S. Deng, C. Wu, X. H. Han on behalf of EAFON report:
We began to observe GRB110411A ( Grope et al., GCN 11918)
with Xinglong TNT telescope at 19:35:32 (UT), 81 sec after
the burst. A series of White and R-band images were obtained.
With the combination of all R-band images of 37*60 sec
exposure time, we detected an new source nearby the
errorbox of X-ray counterpart ( Goad et al., GCN 11920 ).
The coordinates of new source are:
Ra: 19:25:45.65
Dec: 67:42:39.1
Epoch: J2000
The uncertainty of the coordinates is about 1 arc.
The brightness of this source is estimated to be about
21 +/- 0.2 mag in the R band, at the mean time of 38 min
after the burst, comparing to an USNO B1.0 R2 reference star,
of which the coordinates are
19:25:52.432 +67:43:44.07 J2000 R2=16.18mag.
We proposed that the new source be the optical
counterpart of GRB 110411A.
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