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@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).

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