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GCN Circular 13253

GRB 120422A: Xinglong TNT optical upper limit
2012-04-23T02:38:19Z (12 years ago)
L.P. Xin at NAOC <>
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.

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For more information about Xinglong GRBs Follow-up
observations, please visit the website:
We thank Liang Ma for performing these observations.
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