[vsnet-grb-info 12112] GRB 120722A: Correction for GCN circ.13500

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13501
SUBJECT: GRB 120722A:  Correction for GCN circ.13500
DATE:    12/07/22 16:43:59 GMT
FROM:    L.P. Xin at NAOC  <xlp at 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.