GCN Circular 11649
Subject
GRB 110205A: Swift/UVOT Continuing Observations
Date
2011-02-05T17:55:39Z (13 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M. M. Chester (PSU) and A. P. Beardmore (U Leicester) report on
behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110205A
164 s after the BAT trigger (Beardmore et al., GCN Circ. 11629).
The peak near 1000s reported by Klotz et al. (GCN Circ. 11632) and
Andreev et al. (GCN Circ. 11641) is seen in the UVOT optical filters
and one of the UV filters (uvw1), consistent with the reported
redshift z=2.22 (Cenko et al., GCN Circ. 11638 and Vreeswijk et al.,
GCN Circ. 11640). The weak detections (2-3 sigma) in uvw2 are
probably due to the filter's extended sensitivity in the red.
After 5000s, the estimated temporal slope in the white filter is 1.6.
Preliminary photometry using the UVOT photometric system (Poole et al.
2008, MNRAS, 383, 627) for the finding chart (FC) and subsequent
exposures is:
FILTER TSTART TSTOP MAG +/- UL(2o)
white_FC 164.0 313.8 18.79 0.07
white 601.9 621.7 17.01 0.08
white 774.6 794.4 15.74 0.06
white_FC 875.4 1025.1 15.36 0.04
white 1181.0 1375.8 15.39 0.05
v 652.0 671.8 15.76 0.11
v 824.3 844.1 14.98 0.08
v 1056.5 1251.8 14.68 0.06
b 577.5 597.3 17.10 0.12
b 750.3 770.1 15.77 0.07
b 1154.7 1351.5 15.33 0.05
u_FC 321.9 571.7 18.24 0.09
u 725.4 745.2 15.59 0.09
u 1130.5 1325.1 15.02 0.06
uvw1 701.0 720.8 18.23 0.41
uvw1 1106.0 1300.8 17.09 0.17
uvm2 676.3 1276.1 19.89
uvm2 1430.1 1795.8 19.60
uvw2 627.4 1226.2 19.89 0.49
uvw2 1381.4 1747.0 19.28 0.41
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).