GCN Circular 19390
Subject
GRB 160504A: Swift/UVOT Upper Limits
Date
2016-05-05T18:34:55Z (8 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and D. Malesani (DARK/NBI)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160504A
99 s after the BAT trigger (Malesani et al., GCN Circ. 19382).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 19386)
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) 99 249 147 >20.8
white 99 11822 1316 >21.7
v 587 16542 1317 >20.2
b 513 10910 1145 >21.5
u (fc) 257 507 246 >20.4
u 257 6616 678 >21.2
w1 636 6411 432 >20.4
m2 4571 17443 1275 >21.0
w2 735 12387 963 >21.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).