GCN Circular 17538
Subject
GRB 150302A: Swift/UVOT Upper Limits
Date
2015-03-02T23:45:02Z (10 years ago)
From
Margaret Chester at PSU <chester@swift.psu.edu>
M. M. Chester (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150302A
110 s after the BAT trigger (Lien et al., GCN Circ. 17526). No optical
afterglow consistent with the optical candidate reported by Fynbo et al.
(GCN Circ. 17527) 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) are as follows. We report only the
second finding chart (FC) exposure and subsequent exposures; the first
finding chart exposure was too short (< 2 s) to be useful.
Filter T_start(s) T_stop(s) Exp(s) UL (3-sigma)
white_FC 3436 3585 147 >21.4
white 3436 11616 993 >22.1
v 5262 28248 1077 >21.0
b 3799 17368 1738 >22.2
u 3594 23030 2557 >21.9
w1 5672 22421 1960 >21.5
m2 5466 28871 1690 >22.4
w2 4210 27342 995 >21.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).