[vsnet-grb-info 10214] GRB 110206A: UVOT detection of afterglow candidate
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Feb 8 02:27:12 JST 2011
TITLE: GCN CIRCULAR
NUMBER: 11662
SUBJECT: GRB 110206A: UVOT detection of afterglow candidate
DATE: 11/02/07 17:27:08 GMT
FROM: Erik Hoversten at Swift/Penn State <hoversten at astro.psu.edu>
E. A. Hoversten (PSU) and P. A. Evans (U. Leicester) report on behalf of
the Swift UVOT team:
We have analyzed Swift UVOT observations of the INTEGRAL-detected
GRB 110206A (Mereghetti et al. et al. GCN Circ. 11654). UVOT
observations
began 26.9 ks after the INTEGRAL trigger. The UVOT data reveal a
faint new
source that does not appear in archival MAST DSS images. The refined
UVOT
position of the new source is:
RA (J2000) 06:09:20.14 = 92.33392 (deg)
Dec (J2000) -58:48:25.3 = -58.80703 (deg)
with an estimated uncertainty of 0.8 arcsec (radius, 90% confidence,
statistical + systematic). This position is within 0.2 arcseconds of
the
enhanced XRT position (Evans, GCN Circ. 11657) which is well within the
measurement errors.
The source is detected in the uvw1, u, and b filters, while an upper
limit
was found in uvm2. The observed magnitudes and 3-sigma upper limits
using
the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) are:
Filter T_start(s) T_stop(s) Exp(s) Mag
=============================================================
b 28761 29253 480 21.00 +/- 0.37
u 27847 34952 1044 20.56 +/- 0.24
uvw1 26941 34783 1771 20.36 +/- 0.26
uvm2 32977 33876 885 > 20.61
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).
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