GCN Circular 16088
Subject
GRB 140408A: Swift/UVOT Upper Limits
Event
Date
2014-04-09T07:42:56Z (12 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140408A
109 s after the BAT trigger (D'Elia et al., GCN Circ. 16082).
No optical afterglow consistent with the XRT position (Evans et al.,
GCN Circ. 16085,) and with the non-detection reported by Kuroda et al.
(GCN Circ. 16086), 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 109 259 147 >20.9
u_FC 321 571 246 >20.5
white 109 1025 334 >21.2
v 652 4403 236 >20.0
b 577 769 39 >18.7
u 321 745 265 >20.5
w1 701 720 19 >18.1
m2 676 4572 201 >19.9
w2 627 1046 54 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).