GCN Circular 17635
Subject
GRB 150323C: Swift/UVOT Upper Limits
Date
2015-03-24T12:55:50Z (9 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and A. Amaral-Rogers (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150323C
179 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 17621).
No optical afterglow consistent with the optical position
(Xu et al. GCN Circ. 17625) 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 179 328 147 >21.5
u_FC 337 587 246 >20.7
white 179 11759 1513 >22.4
v 669 12698 555 >21.0
b 594 7661 444 >21.1
u 337 7541 717 >21.0
w1 718 7337 432 >21.2
m2 5494 7131 393 >20.6
w2 5084 12665 1279 >22.1
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).