GCN Circular 18238
Subject
GRB 150902A: Swift/UVOT Upper Limits
Date
2015-09-04T15:37:25Z (9 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and L. Hagen (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150902A
59510 s after the LAT trigger (Arimoto et al., GCN Circ. 18228).
No optical afterglow consistent with the XRT Source 1 position given in
McCauley et al. (GCN Circ. 18237) is detected in the initial UVOT
exposures. Source 2 is outside the UVOT field of view.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial
exposures for source 1 are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 60331 60972 631 >21.7
v 61152 61997 828 >20.3
u 59510 66787 1184 >20.7
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.40 in the direction of the
burst (Schlegel et al. 1998).