GCN Circular 19963
Subject
GRB 160927A: Swift/UVOT Upper Limits
Date
2016-09-28T16:13:58Z (8 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Paul Kuin(MSSL-UCL) and S. L. Gibson (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160927A
85 s after the BAT trigger (Gibson et al., GCN Circ. 19952).
No optical afterglow consistent with the optical position
(D'Avanzo et al. GCN Circ. 19956)
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 85 235 147 >21.0
u_FC 297 547 246 >20.4
white 85 13184 1426 >21.8
v 627 6999 510 >19.9
b 553 12500 1179 >21.5
u 297 11587 1433 >21.1
w1 850 7411 491 >20.2
m2 826 7204 294 >20.5
w2 602 6794 510 >21.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).