[vsnet-grb-info 4347] GRB070223: Swift/UVOT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6134
SUBJECT: GRB070223: Swift/UVOT refined analysis
DATE:    07/02/23 15:55:51 GMT
FROM:    Wayne Landsman at GSFC/SSAI  <landsman at milkyway.gsfc.nasa.gov>

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Message-ID: <45DF0C17.9020206 at milkyway.gsfc.nasa.gov>
Date: Fri, 23 Feb 2007 10:45:27 -0500
From: Wayne Landsman <landsman at milkyway.gsfc.nasa.gov>
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To:  gcncirc at capella
Subject: GRB070223: Swift/UVOT refined analysis
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W. Landsman(NASA/GSFC), L. Angelini(GSFC/JHU) and J. Greiner(MPE) report 
on behalf of the Swift UVOT team:

The Swift/UVOT observed the field of GRB 070223 starting 102s after the 
BAT trigger (Vertere et al. 2007, GCN Circ. 6125) with the settling 
exposure.

We do not find any source, in any of the UVOT observations, inside of 
the refined XRT error circle (Vertere et al. 2007, GCN Circ. 6130).

We have the following 3-sigma upper limits for a source inside the XRT 
error circle in the first exposure with the White filter, and in the 
coadded frames with all filters:

Filter  T_Start    T_End   Exp (s)   3sigma U.L. mag

White   120         219      98         20.2

V       102         295      79         18.9
B      5893        6084     189         20.6
U      5688       16398     351         20.5
UVW1   3863       16234    1069         21.2
UVM2   3658        3858     197         20.1
White   120       11872    1002         21.4

No correction has been made for the small extinction corresponding to 
E(B-V) = 0.015
(Schlegel et al. 1998).


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