TITLE: GCN CIRCULAR NUMBER: 15957 SUBJECT: GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope DATE: 14/03/12 01:06:41 GMT FROM: Michitoshi Yoshida at HASC,Hiroshima U M. Yoshida, R. Itoh, Y. Moritani (HASC, Hiroshima Univ.), G. B. Ali, A. Essam, A. Takey, and G. Hamed (NRIAG, Egypt) We performed recalibration of the photometry of the OT of GRB 140311A (Racusin et al. GCN 15944), and found that the R-band magnitude we previously reported (Yoshida et al. GCN 15954) is about 1 magnitude fainter than the newly calibrated value. The recalibration result is as follows: MID-UT T-EXP[sec] R[mag] err[mag] ---------------------------------------- 23:19:29 1800.0 20.9 +- 0.3 ----------------------------------------