GCN Circular 7982
Subject
GRB 080714: Swift/UVOT Detection of an Optical Afterglow
Event
Date
2008-07-15T16:06:40Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and M. Perri (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 080714 starting 90 s after
the BAT trigger (Perri et al., GCN Circ. 7978). The burst is in
a crowded field only 2.5 degrees from the Galactic Plane.
We find a fading source inside the enhanced XRT error circle
(Goad et al., GCN Circ. 7980) in observations with the White and
V filters. The preliminary position for the afterglow is:
RA(J2000) = 12:32:25.44 = 188.1060
DEC(J2000) = -60:16:40.4 = -60.2779
with a 90% confidence error radius of about 0.8 arcsec.
The measured magnitudes in the UVOT photometric system (Poole et al.
2008, MNRAS, 383, 627) and 3-sigma upper limits for detecting
a source in the first two finding chart (FC) exposures and
subsequent co-added exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white (FC) 90 189 98 20.2 +/- 0.2
white 4290 4489 197 >20.7
v (FC) 197 596 393 19.1 +/- 0.2
v 5896 6095 197 >19.7
b 677 4284 206 >20.2
u 652 12382 1137 >20.7
uvw1 628 6505 236 >19.7
uvm2 602 6300 236 >19.9
uvw2 707 16498 1007 >20.8
The values quoted above are not corrected for the predicted large, but uncertain,
Galactic extinction the direction of the burst (Schlegel et al. 1998).