GCN Circular 22839
C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), A. Cucchiara (U. of Virgin Islands) on behalf of a large collaboration report: One LCO 1-m unit at Siding Springs Observatory began observing Swift GRB 180624A (Gibson et al. GCN 22832) on June 24, 14:18 UT (28.5 min since the GRB trigger time) with the SDSS r filter. Within the enhanced Swift-XRT error circle (Goad et al. GCN 22835) we find an uncatalogued object with a magnitude of r'=19.92 +- 0.10 (AB) at a mid time of 0.54 hours since the GRB trigger time at the following position: RA(J2000) = 21:12:23.38 DEC(J2000)= -02:20:16.7 with an error radius of ~1".