GCN Circular 26127
Subject
GRB 191031C: Swift/UVOT Detection
Event
Date
2019-11-01T16:22:13Z (6 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 191031C: Swift/UVOT Detection
J. D. Gropp (PSU) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191031C
91 s after the BAT trigger (Ambrosi et al., GCN Circ. 26108).
A source consistent with the XRT position
(Goad et al. GCN Circ. 26115)
is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT
photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u 307 556 245 >19.71
white 92 242 147 20.27+-0.32
white 862 1011 147 >20.39
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).