TITLE: GCN CIRCULAR NUMBER: 42354 SUBJECT: GRB 251016A: Swift/UVOT Detection DATE: 25/10/18 12:05:09 GMT FROM: s.shilling@lancaster.ac.uk
S.P.R. Shilling (Lancaster U.) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 251016A, detected by SVOM/ECLAIRs (Basa et al., GCN Circ. 42308) and Fermi/GBM (Fermi GBM team, GCN Circ. 42309), 6.66 ks after the SVOM/ECLAIRs trigger.
A source is detected in the optical by the Swift/UVOT at a position that is consistent with the likely X-ray counterpart detected by the Swift/XRT (Source 1: Evans et al., GCN Circ. 42311).
Preliminary detections and upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the images are:
Filter T_start(ks) T_stop(ks) Exp(s) Mag
u 6.66 12.6 491.7 19.13 +/- 0.26 b 6.91 12.7 296.0 18.70 +/- 0.18 v 7.42 7.67 245.8 17.52 +/- 0.15 w1 12.1 12.4 245.8 >18.93 w2 7.17 7.42 245.8 >19.05 m2 7.68 7.85 168.3 >18.66
The magnitudes reported here are not corrected for Galactic extinction.
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