GCN Circular 8757
Subject
GRB 081230 Swift/UVOT Observations
Event
Date
2008-12-31T12:31:41Z (17 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and V. La Parola (INAF-IASFPA) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began observerving the field of GRB 081230 132 s
after the BAT trigger ( La Parola et al., GCN Circ. 8753). We detect the
optical afterglow in the white, v, b and u filters at the position:
RA(J2000.0) = 02:29:19.467
DEC(J2000.0) = -25:08:51.0
with an estimated uncertainty of 0.9 arcsec (radius, 90% confidence).
This position is consistent with the UVOT-enhanced XRT position
(Osborne et al., GCN 8756)
and the optical afterglow position reported by ROTSE-III (Yuan et al.,
GCN 8754).
The magnitudes and 3 sigma upper limits are reported below:
Filter T_start (s) T_stop Exposure Mag/3sig UL
------------------------------------------------------------
white 4060 4210 147 20.45 +/- 0.35
v 587 607 19 18.30 +/- 0.48
b 388 408 19 18.92 +/- 0.36
u 132 382 246 20.28 +/- 0.38
u 511 531 19 19.04 +/- 0.52
uvw1 487 5854 435 > 21.23
uvm2 462 5649 255 > 20.95
uvw2 414 6575 353 > 21.44
------------------------------------------------------------
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.01 mag (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT flight system
described in Poole et al. (2008, MNRAS, 383,627).