GCN Circular 9802
Subject
GRB 090814A: Swift/UVOT Observations
Date
2009-08-14T13:52:07Z (15 years ago)
From
Peter Curran at MSSL <pac@mssl.ucl.ac.uk>
P.A. Curran (MSSL-UCL), T. N. Ukwatta (GSFC/GWU), report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090814A
170s after the BAT trigger (Ukwatta et al., GCN 9793). The proposed
optical counterpart (Updike et al. , GCN 9794) is marginally detected in
the u and white UVOT exposures. No optical afterglow consistent with the
enhanced XRT position (Beardmore et al., GCN 9796) is detected in the
other UVOT exposures.
Preliminary magnitudes and 3-sigma upper limits using the UVOT
photometric system (Poole et al. 2008, MNRAS, 383, 627) for for the
first finding charts (FC) and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
u 328 577 246 > 20.16 (FC)
wh 170 319 147 > 20.70 (FC)
u 328 8144 834 21.05 +/- 0.35
b 584 8340 599 > 21.30
v 658 7528 607 > 20.18
w1 708 7939 529 > 20.66
m2 683 7733 529 > 20.5
w2 708 7939 607 > 20.81
wh 170 7117 699 21.54 +/- 0.27
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.078 in the direction of the burst
(Schlegel et al. 1998).