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GCN Circular 13501

Subject
GRB 120722A: Correction for GCN circ.13500
Event
GRB 120722A
Date
2012-07-22T16:43:59Z (13 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 apologize for the wrong result reported in GCN circ. 13500 . 

Caused by a wrong astronomical calibration,
the optical candidate of GRB 120722A reported in GCN circ. 13500 
should be a known object in the USNO B1.0 

Therefore, no any new source within the location of 
XRT counterpart was detected by TNT.  The 3 sigma upper limit
of 21 mag was derived relatively to USNO B1.0 R2 mag.
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