GCN Circular 20484
Subject
GRB 170117A: Swift/UVOT Upper Limits
Date
2017-01-19T12:38:02Z (8 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170117A
86251 s after the BAT trigger (Palmer, GCN Circ. 20480).
No optical afterglow consistent with the BAT position given in that
circular is detected in the initial UVOT exposures.
The preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial summed
exposures is:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 86251 116034 2654 >22.0
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.35 in the direction of the
burst (Schlegel et al. 1998).