GCN Circular 17560
B. Dintinjana, S. Maticic and H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory. We observed the field of GRB 150309A (Cummings et al., GCN 17553) from Crni Vrh Observatory with a 60 cm robotic telescope and clear filter. Twenty six consecutive exposures of 60 second duration were taken in moonlight conditions. First exposure started at 2015-03-09 23:05:34 UT, 68 seconds after the SWIFT trigger. No optical candidate was detected within the uncertainty radius on single exposures, having limiting magnitude 19.2, calibrated against the nerby USNO-B R2 magnitude stars. Also we found no optical candidate on 26 sumed unfiltered images with total exposure of 1560 seconds and limiting magnitude 20.8 (calibrated against the nerby USNO-B R2 magnitude stars).