GCN Circular 9949
Subject
GRB090926B: Swift/UVOT Upper Limits
Date
2009-09-27T12:42:23Z (15 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and D. Grupe (PSU) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 090926B 98s after the BAT trigger (Grupe et al., GCN 9935).
We do not detect any source at the position reported by
VLT (Malesani et al., GCN 9944) and the enhanced Swift XRT
position (Grupe et al. GCN 9940).
The 3-sigma upper limits for the finding charts (FC) and summed images
are:
Filter T_start T_stop Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------------
white(FC) 98 248 147 > 21.02
white 591 2053 303 > 21.21
v 641 2103 175 > 19.19
b 567 5976 226 > 20.32
u(FC) 310 560 246 > 20.30
u 715 5900 333 > 20.22
uvw1 691 5695 333 > 20.25
uvm2 5290 5490 197 > 19.77
uvw2 616 1389 58 > 19.09
-------------------------------------------------------------
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.02 mag.
All photometry is on the UVOT photometric system described in Poole et
al. (2008, MNRAS, 383, 627).