TITLE: GCN CIRCULAR NUMBER: 7387 SUBJECT: GRB080310: Super-LOTIS suggestion of brightening DATE: 08/03/10 10:09:06 GMT FROM: Peter A. Milne at Super-LOTIS P.A. Milne and G.G. Williams (U Arizona) report on behalf of the Super-LOTIS team: The 0.6m Super-LOTIS telescope began R-band observations of the error region of GRB080310 (Swift trigger 305288) at 08:38:43 UT, 44 seconds after the start of the burst. The OT detected by Chornock et al. (GCN 7381) and confirmed by Cummings et al. (GCN 7382) is not apparent in the initial images, but is clearly visible in subsequent images. A stack of the initial 3x10s exposures does not detect the GRB, while subsequent single 20sec exposures do, suggesting that the GRB brightened during the first two minutes. We used the USNO-B star at RA=14:40:11.3, Dec==00:10:40.6 (0898-0239265) to derive the R magnitude. The R-band magnitude of the afterglow in the first image is: UT Start UT End ExpTime R mag error Single 08:40:29 08:41:09 1x20s 17.97 +/- 0.18 08:41:03 08:41:23 1x20s 16.81 +/- 0.08 Stack 08:40:29 08:42:37 5x20s 16.91 +/- 0.04 08:43:24 08:54:27 10x60s 16.98 +/- 0.02 Observations are continuing. This message can be cited.