GCN Circular 11242
Subject
GRB 100906A: Swift/UVOT Observations
Date
2010-09-07T02:33:56Z (14 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU) and C. B. Markwardt (NASA/GSGC) report on behalf
of the Swift/UVOT team.
The Swift/UVOT began settled observations of the field of
GRB 100906A 89s after the BAT trigger (Markwardt et al.,
GCN Circ. 11227). Data summed from the first orbit confirms
a fading optical transient at the position report by Markwardt
et al. The non-detection in the UVW2 and UVM2 filters is consistent
with the Gemini redshift of 1.727 reported by Tanvir et al.
(GCN Circ. 11230). Observations of the GRB are continuing.
The magnitudes and 3-sigma upper limits for the finding chart
(fc) and summed exposures are reported below:
FILTER T_start(s) T_stop Exposure Mag/3UL
========================================================
u (fc) 146 396 245 14.93+-0.02
u 146 1305 490 15.40+-0.01
v 453 1381 116 15.97+-0.05
b 403 1330 116 16.49+-0.04
uvw1 503 1280 97 17.13+-0.11
uvm2 478 1404 115 >18.97
uvw2 429 1356 116 >19.19
=======================================================
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.36 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).