GCN Circular 11871
Subject
GRB 110402A: Swift/UVOT detection of afterglow candidate
Event
Date
2011-04-03T02:32:55Z (15 years ago)
From
Craig Swenson at PSU/Swift <cswenson@astro.psu.edu>
C. A. Swenson (PSU) and T. N. Ukwatta (MSU)report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110402A
548 s after the BAT trigger (Ukwatta et al., GCN Circ. 11857).
We find a faint new source consistent with the enhanced XRT position
(Beardmore et al., GCN Circ. 11860).
Preliminary magnitudes and 3-sigma upper limits using the UVOT
photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
---------------------------------------------------------------------
white_FC 548 698 147 >20.5
white 548 24657 1628 20.89 �0.11
v 704 18897 510 >20.1
b 803 24593 1544 20.84 �0.20
u 778 30417 430 >20.6
w1 754 30390 1296 20.39 �0.22
m2 7176 7376 197 >19.7
w2 6767 18791 1112 20.29 �0.20
The values quoted above 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).