TITLE: GCN CIRCULAR NUMBER: 13080 SUBJECT: GRB 120320A: BOOTES-4 optical upper limit DATE: 12/03/21 01:05:22 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia J.C. Tello (IAA-CSIC), P. Kubanek (IP AS CR & IAA-CSIC), J. Gorosabel (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), S. Guziy (Nikolaev St. Univ.), Yufeng Fan, Xiaohong Zhao, Jiming Bai, Chuanjun Wang and Yuxin Xin (Yunnan National Astronomical Observatory) and Chenzhou Cui (Beijing National Astronomical Observatory), report on behalf of a larger collaboration: "We observed the field of GRB 120320A (Markwardt et al., GCNC 13071), detected by Swift/BAT, with the 0.6m BOOTES-4/MET telescope at the Lijiang Astronomical Observatory, China. Unfiltered images were obtained starting 13:48:44UT at high airmass (2h12m after the burst, limited by the local horizon). The resulting limiting magnitude (63 x 180s) is 16.3 when calibrated with the R1Mag value of USNO-B1.0 catalogue stars." This message may be cited. [GCN OPS NOTE(21mar12): Per author's request CW & YX were added to the author list.]