GCN Circular 18615
Subject
GRB 151118A: Swift/UVOT Upper Limits
Date
2015-11-18T12:31:35Z (8 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and Amaral-Rogers (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151118A
70 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 18611).
No optical afterglow consistent with the XRT position
(Amaral-Rogers et al. GCN Circ. 18611)
is detected in the initial UVOT exposures.
Preliminary 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) 70 220 148 >20.6
u (fc) 282 532 246 >20.0
white 70 754 186 >20.8
v 612 631 19 >18.3
b 537 730 39 >19.3
u 282 705 265 >19.9
w1 661 680 19 >18.2
w2 587 607 19 >17.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.10 in the direction of the burst
(Schlegel et al. 1998).