GCN Circular 14092
Subject
GRB 121217A: Swift/UVOT Detection
Date
2012-12-17T18:14:46Z (12 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121217A
73 s after the BAT trigger (Siegel et al., GCN Circ. 14089).
A source consistent with the GROND optical position (Elliott et al. GCN Circ. 14091)
is detected in the initial UVOT exposures. The preliminary UVOT position is:
RA (J2000) = 10:14:50.32 = 153.7097 (deg)
Dec (J2000) = -62:21:03.3 = -62.35096 (deg)
with an estimated uncertainty of 0.6 arcsec (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 73 222 147 19.58 +/- 0.13
v 616 5906 313 19.01 +/- 0.22
b 541 560 19 18.76 +/- 0.36
u 285 6522 540 20.09 +/- 0.34
w1 666 6317 313 >19.96
m2 641 6112 313 >19.85
w2 591 7138 510 >20.37
The magnitudes in the table are not corrected for the significant Galactic extinction
due to the reddening of E(B-V) = 0.37 in the direction of the burst
(Schlegel et al. 1998).