GCN Circular 21155
Subject
GRB 170526A: Swift/UVOT Upper Limits
Event
Date
2017-05-27T13:28:48Z (9 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (Uni. of Warwick) and B. Sbarufatti (INAF-OAB/PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170526A
128 s after the BAT trigger (Sbarufatti et al., GCN Circ. 21149).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 21151) 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 128 278 147 >19.9
white 128 4127 344 >20.4
v 4338 4537 197 >18.5
b 3722 5197 235 >19.7
u 286 5152 404 >19.4
w1 4748 4947 196 >19.1
m2 4542 4742 197 >19.3
w2 4133 4333 197 >19.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).