GCN Circular 22004
Subject
GRB 171010A: Swift/UVOT Detection
Event
Date
2017-10-12T13:22:35Z (8 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171010A
69338 s after the LAT trigger (Omodei et al., GCN Circ. 21985).
A afterglow (Thorstensen and Halpern, GCN Circ. 21987, Izzo and
Malesani, GCN Circ. 21988, Guidorzi et al., GCN Circ. 21991, Malesani et
al., GCN Circ. 22000, Harita et al., GCN Circ. 22001) is detected in the
initial UVOT exposures. However it is not possible to distinguish this
source from the position of the Pan-STARRS source given in Izzo and
Malesani (GCN Circ. 21988). The source magnitude is not changing
significantly within this observation.
Preliminary detections using the UVOT photometric system (Breeveld et
al. 2011, AIP Conf. Proc. 1358, 373) for the summed exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 69338 80991 4818 18.84 �� 0.02
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.15 in the direction of the
burst (Schlegel et al. 1998).