TITLE: GCN CIRCULAR NUMBER: 42100 SUBJECT: GRB 251003A: Swift/UVOT Upper Limits DATE: 25/10/03 18:33:33 GMT FROM: s.shilling@lancaster.ac.uk
S. P. R. Shilling (Lancaster U.), M. De Pasquale (Univ. Messina) and A. P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 251003A 79 s after the BAT trigger (Beardmore et al., GCN Circ. 42070).
No optical afterglow consistent with the enhanced XRT position (Evans et al., GCN Circ. 42088) or those reported by other instruments (Aceituno et al., GCN Circ. 42072; Moreno Méndez et al., GCN Circ. 42073; Strausbaugh et al., GCN Circ. 42074; Worssam et al., GCN Circ. 42094), 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 79 229 147 >20.70 u 291 474 180 >19.78 v 33828 34558 711 >20.01 b 43530 43837 298 >20.30
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.408 in the direction of the burst (Schlegel et al. 1998).
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