GCN Circular 17892
Subject
GRB 150530A: Swift/UVOT Upper Limits
Event
Date
2015-05-30T21:29:27Z (10 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
M. De Pasquale (UCL-MSSL) and R. L. C. Starling (U Leicester)report on
behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150530A
106 s after the BAT trigger (Starling et al., GCN Circ. 17888).
No optical afterglow consistent with the XRT position (Goad et al.
GCN Circ. 17889) 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 106 256 147 >20.1
u_FC 319 562 238 >19.2
white 106 5690 541 >21.0
v 4465 6101 393 >19.3
b 3849 5485 393 >20.4
u 319 5280 435 >19.7
w1 4875 5075 197 >19.5
m2 4670 6306 393 >19.9
w2 4260 5896 393 >20.1
The magnitudes in the table are not corrected for the strong Galactic
extinction due to the reddening of E(B-V) = 1.81 in the direction of
the burst (Schlegel et al. 1998).