GCN Circular 18322
Subject
GRB 150915A: Swift UVOT upper limits
Date
2015-09-16T17:53:39Z (9 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
A. A. Breeveld (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 150915A
295s after the BAT trigger (D'Elia et al., GCN Circ. 18315).
No optical afterglow consistent with the XRT position (D���Elia et al.,
GGN Circ. 18315) or the GROND position (Yates et al., GCN Circ. 18317)
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
u_FC 295 545 246 >20.0
white 576 769 39 >19.9
v 625 818 39 >18.2
b 550 745 39 >19.2
u 295 4267 434 >20.0
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.10 in the direction of the
burst (Schlegel et al. 1998).