[vsnet-grb-info 7294] GRB 090126A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Jan 31 03:03:51 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8864
SUBJECT: GRB 090126A: Swift/UVOT Upper Limits
DATE: 09/01/30 18:03:40 GMT
FROM: Stephen Holland at USRA/NASA/GSFC/SSC <Stephen.T.Holland at nasa.gov>
S. T. Holland (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), and
M. C. Stroh (PSU) report, on the behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 090126A (Evangelista
et al. 2009, GCN Circ. 8852) starting approximately 48 ks after the
SuperAGILE detection. We find no new source, relative to the DSS or
USNO-B1.0 catalogue, or a variable source, inside the UVOT-enhanced
XRT error circle (Stroh et al. 2009, GCN Circ. 8854). Preliminary
3-sigma upper limits for detecting a source in the co-added images,
using an aperture-corrected 2.5 arcsecond radius circular aperture,
are
Filter T_start T_stop Exp(s) Mag
------------------------------------------
v 49,398 55,302 208 >20.1
b 48,033 71,752 3256 >22.7
u 47,960 71,155 333 >21.0
white 48,713 66,162 2022 >23.1
------------------------------------------
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a
reddening of E_{B-V} = 0.20 mag (Schlegel et al., 1998, ApJS, 500,
525). All photometry is on the UVOT photometry system described in
Poole et al. (2008, MNRAS, 383, 627).
Please update my e-mail address in your Address Book to <Stephen.T.Holland at nasa.gov
>.
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