GCN Circular 21315
Subject
GRB170710A: Swift/UVOT detection
Event
Date
2017-07-10T19:37:22Z (9 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL), F. E. Marshall (NASA/GSFC) and P. A. Evans
(U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170710A
132 s after the BAT trigger (Evans et al., GCN Circ. 21308).
An optical afterglow consistent with the enhanced XRT position (Osborne
et al., GCN Circ. 21310) and Gemini position (Cuchhiara, GCN Circ.
21311) is detected in the initial UVOT white finding chart.
Preliminary detection and 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_FC 132 281 147 20.95 +/- 0.3
white 5808 6007 197 >21.0
v 2122 2141 19 >17.9
b 546 565 19 >18.9
u 290 539 246 >20.2
w1 2171 2166 20 >17.1
w2 2098 2117 20 >17.6
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.172 in the direction of
the burst (Schlegel et al. 1998).