GCN Circular 6291
Subject
GRB 070411: Swift/UVOT observations
Date
2007-04-12T14:00:03Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R.Oates (UCL-MSSL) and A. Moretti (INAF-OAB) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 070411 on 2007-04-11 at
20:16:37 UT, 243s after the BAT trigger (Moretti et al., GCN 6267). A weak
afterglow is detected in the WHITE, V and B filters at a refined position:
RA(J2000) = 07:09:19.903
Dec(J2000) = +01:03:52.95
The magnitudes and 3 sigma upper limits are provided in the table below.
The numbers in square brackets represent the significance of the detections.
Filter Start(s) End(s) Exposure Magnitude
-----------------------------------------------------------------
WHITE 242.9 342.7 98.2 18.76 +/- 0.13 [8.3]
WHITE 4418.0 4617.8 196.6 20.56 (3sigma UL)
V 349.2 368.9 19.5 17.40 +/- 0.33 [3.3]
V 4827.9 4911.8 82.6 18.81 (3sigma UL)
B 445.9 455.7 9.6 19.02 +/- 0.65 [1.8]
B 4213.5 4413.2 196.6 20.56 +/- 0.51 [2.1]
U 421.5 4208.2 216.1 19.87 (3sigma UL)
UVW1 397.5 16931.8 833.9 20.89 (3sigma UL)
UVM2 373.1 16297.4 1326.0 21.38 (3sigma UL)
UVW2 474.9 4823.2 216.1 20.37 (3sigma UL)
------------------------------------------------------------------
These magnitudes are not corrected for the Galactic reddening of E(B-V)=0.285.
The value of the Galactic reddening is uncertain as the burst lies at a
Galactic latitude of +5 degrees.