GCN Circular 13403
D. Xu (WIS), L.-P. Xin (NAOC), D. Malesani, J. P. U. Fynbo (DARK/NBI), S. Geier (NOT) report on behalf of a larger collaboration, Using the 2.5m Nordic Optical Telescope (NOT) equipped with StanCam, we observed GRB 120630A (distributed by Swift PI: Neil Gehrels) whose initial XRT localization/position was determined as RA(J2000) = 23h 29m 10.6s Dec(J2000) = 42d 33m 14.1s with an uncertainty of 10 arcsec radius. Observations started at 03:06:20 UT on 2012-07-02 (i.e., 27.8 hr since the BAT trigger) and 5x360s R-band frames were obtained. Within the XRT error circle, an optical source is clearly detected in the stacked image at coordinates RA(J2000) = 23h 29m 10.23s Dec(J2000) = 42d 33m 13.0s with an uncertainty of 0.5 arcsec radius. The source had R=22.53 +/- 0.15 mag, calibrated with nearby USNO stars with R2 magnitudes.