GCN Circular 22967
Subject
GRB 180715A: Swift/UVOT Upper Limits
Date
2018-07-19T15:46:40Z (7 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180715A
4312 s after the BAT trigger (Ukwatta et al., GCN Circ. 22947).
No optical afterglow consistent with the BAT position (Ukwatta et al., GCN
Circ. 22951) 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 4312 4462 147 >20.6
white 4312 5695 344 >21.0
v 4469 4669 197 >19.1
b 5290 5490 197 >20.1
u 5085 5284 197 >19.8
w1 4879 5079 197 >19.5
m2 4674 4874 197 >19.7
w2 5701 5726 25 >18.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).