GCN Circular 3220
Subject
GRB 050410: Early observations with Swift-UVOT
Date
2005-04-10T17:03:38Z (19 years ago)
From
Padi Boyd at GSFC <padi@milkyway.gsfc.nasa.gov>
P. Boyd (GSFC), V. Mangano (INAF-IASF/Palermo), S. T. Holland (GSFC), S.
Hunsberger (PSU), T. Poole (MSSL), M. Still (GSFC), N. Gehrels (GSFC), K.
Mason (MSSL), J. Nousek (PSU) report, on behalf of the Swift UVOT team:
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled
observations of the field of GRB 050410 (Parola et al; GCN 3218) at
12:46:17 UT on 10 April 2005. This is immediately after the target exited
the Swift Earth-limb constraint, 1912 seconds after the BAT trigger.
The first UVOT data arrived via TDRSS; it is a 100s V image starting
immediately after spacecraft settling, binned 8x8 (pixel size 4.x4.
arcsec) centered on the BAT position, and 5.33 arcminutes per side.
Mid-exposure time was 1962 s after the trigger. A comparison against the
Digitized Sky Survey reveals no new sources within the BAT and XRT error
circles down to a 5-sigma background limit of V = 18.5 with a systematic
uncertainty of 0.1 mag (due to uncertainties in the photometric zero
point). This limit is based upon preliminary flight calibrations.