TITLE: GCN CIRCULAR NUMBER: 42121 SUBJECT: GRB 251005C: Swift/UVOT Upper Limits DATE: 25/10/06 10:20:47 GMT FROM: Paul Kuin at MSSL npkuin@gmail.com
N. P. M. Kuin (MSSL/UCL) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 251005C 123 s after the BAT trigger (Page et al., GCN Circ. 42113). No optical afterglow consistent with the XRT position is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 123 273 147 >21.6 u_FC 336 586 246 >19.9 white 123 1536 392 >21.3 v 666 1586 117 >19.4 b 592 1676 108 >19.8 u 336 1659 343 >20.0 w1 715 1461 78 >19.4
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.461 in the direction of the burst (Schlegel et al. 1998).
Please note that the initial GCN (Page et al., GCN Circ. 42113) reported 251005A "A-burst", which was corrected to "C" : GRB 251005C.
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