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GCN Circular 3230

Subject
GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
Date
2005-04-11T02:50:36Z (19 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
P. Boyd (GSFC-UMBC), S. T. Holland, M. Still (GSFC-USRA), V. Mangano
(INAF-IASF/Palermo), S. Hunsberger, (PSU), T. Poole (MSSL), N. Gehrels
(GSFC), K. Mason (MSSL), J. Nousek (PSU), and A. Wells (Leicester) on
behalf of the Swift UVOT team report:

     The Swift Ultraviolet/Optical Telescope (UVOT) observed the field
of GRB 050410 (Fenimore et al., GCN 3219) starting at 12:46:04 UT on
10 April 2005.  We find no evidence for a source in the 5 arcsecond
radius XRT error circle (La Parola et al., GCN 3218) in the UVOT data.
The 3-sigma limiting magnitudes in a 3.5 arcsecond radius circular
aperture , and the coadded exposure times, are: V = 19.9 (392 s), B =
21.2 (1199 s), U = 20.9 (1326 s), UVW1 = 20.8 (399 s), UVM2 = 21.1
(399 s), and UVW2 = 21.7 (788 s).  The magnitudes reported in this
Circular are based upon preliminary flight calibrations.
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