GCN Circular 13253
Subject
GRB 120422A: Xinglong TNT optical upper limit
Date
2012-04-23T02:38:19Z (12 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L. P. Xin, J. Y. Wei, Y. L. Qiu, J. Wang, J. S. Deng,
C. Wu, X. H. Han on behalf of EAFON report:
We began to observe GRB 120422A (Troja et al., GCN 13243)
with Xinglong TNT telescope in R-band at 11:37:41(UT),
4.45 hours after the burst under the bad weather condition.
The optical counterpart ( Cucchiara et al. GCN 13245;
Kuin et al. GCN 13248; Klotz et al. GCN 13250; Schulze et al. GCN 13252)
was not detected in our combined image.
The upper limit was estimated about 19.5 mag in R band
at the mean time of 5.15 hours after
the burst, calibrated against the USNO B1.0 R2mag.
This message may be cited.
For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org:8080/grb/index.html
We thank Liang Ma for performing these observations.