GCN Circular 14086
Subject
GRB 121209A: Swift/UVOT Upper Limits
Date
2012-12-14T17:19:02Z (11 years ago)
From
Stefan Immler at NASA/GSFC <stefan.m.immler@nasa.gov>
S. Immler (NASA/CRESST/GSFC) and A. Maselli (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 121209A
96 s after the BAT trigger (Maselli et al., GCN Circ. 14045).
No optical afterglow consistent with the optical position (Kruehler
et al. GCN Circ. 14049) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 96 246 147 >21.4
white 96 12808 1217 >21.7
v 5857 35749 1967 >20.3
b 5241 24926 1784 >21.1
u 308 30697 1959 >21.6
w1 6267 29936 1968 >21.5
m2 6062 36468 2314 >22.3
w2 5652 34835 1968 >21.8
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).