GCN Circular 14472
Subject
GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
Date
2013-04-27T20:22:45Z (11 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. Pritchard (PSU), A. Maselli (INAF-IASFPA), N. P. M. Kuin (MSSL),
S. R. Oates (MSSL-UCL), M. De Pasquale (MSSL-UCL),
and M. H. Siegel (PSU), report on behalf of the Swift/UVOT team:
Further to Maselli et al., GCN Circ. 14448 we have performed manual
stacking and aspect corrections on the initial UVOT image. These
resulting images still retain some instrumental effects due to the
brightness of the object and loss of star tracking lock.
Preliminary 3-sigma detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the UVOT
observations are:
Filter T_start(s) T_stop(s) Exp(s) Mag
wh 1522 1542 19.5 13.8�1.1
v 382 401 19.5 12.1�0.04
b 480 500 19.5 12.6�1.09
u 456 475 19.5 11.8�1.09
w1 430 450 19.5 11.2�0.04
m2 406 426 19.5 11.2�0.04
w2 358 377 19.5 11.2�0.04
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.24 in the direction of the burst
(Schlegel et al. 1998).