TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4883 SUBJECT: GRB 060313: early afterglow NIR upper limits with REM DATE: 06/03/15 20:40:52 GMT FROM: Andrea Melandri at Rome Astro Obs A. Melandri, S. Covino, E. Palazzi, L.A. Antonelli, E. Molinari, G. Chincarini, F.M. Zerbi,, V. Testa, G. Tosti, F. Vitali, P. Conconi, G. Cutispoto, G. Malaspina, L. Nicastro, E. Meurs, P. Goldoni, on behalf of the REM/ROSS Team The field of the short hard burst GRB 060313 (GCN 4867, Pagani et al.) was imaged by the robotic 60-cm REM telescope with the both infrared (REMIR) and optical (ROSS) camera. Observations started about 33 seconds after the GCN alert about 45 seconds after the burst and a total exposure time of 325, 425 and 325 seconds was obtained with J, H and Ks filter respectively. Preliminary results on these data have been reported in GCN 4868 (Melandri et al.). A refined analysis have been performed on the IR stacked images and no new source is found within the XRT refined error circle (Pagani et al., GCN 4875) and at the position of the OT-candidate suggested by Levan and Hjorth (GCN 4871). We derive the following upper limits for the NIR afterglow: Filter Delta_T (days) Mag_Lim (5 sigma) J 0.018 17.6 H 0.012 17.2 Ks 0.010 16.5 Optical images, acquired with the ROSS optical camera in the I, R and V filters, do not allow to obtain useful information because of a large contamination due to the Moon light. We were able to derive an upper limit only of R > 17.5. This message is citeable. ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/ [GCN OPS NOTE(15mar06): Per author's request, "030613" in the first sentence was changed to "060313".]