GCN Circular 8864

Subject

GRB 090126A: Swift/UVOT Upper Limits

Event

Date

2009-01-30T18:03:40Z (17 years ago)

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. 8852Loading...
 
 ) 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. 8854Loading...
 
 ).  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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