GCN Circular 17617
Subject
GRB150323A: Swift-UVOT detection of the afterglow
Date
2015-03-23T11:40:56Z (9 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) and Amaral-Rogers (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150323A
156 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 17611).
A weak optical afterglow consistent with the XRT position (Goad et al.,
GCN Circ. 17615) or the P60 position (GCN Circ. 17612) is be present
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 156 306 147 20.53+/-0.30
u_FC 314 564 246 >20.0
white 4066 5702 1635 20.96+/-0.33
v 5912 6112 197 18.93+/-0.29
u 314 5291 442 >20.7
u 4991 5191 197 19.86+/-0.35
w1 4887 5086 197 >20.2
m2 4682 4881 197 >20.9
w2 4272 4472 197 >20.4
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).