[vsnet-grb-info 20387] GRB 180314A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22483
SUBJECT: GRB 180314A: Swift/UVOT Detection
DATE:    18/03/14 11:49:54 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (U.Warwick) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180314A
167 s after the BAT trigger (D'Avanzo et al., GCN Circ. 22478).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 22480)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
   RA  (J2000) =  06:37:03.68 =  99.26535 (deg.)
   Dec (J2000) = -24:29:46.0  = -24.49610 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white(FC)          167          317          147         16.28 +/- 0.03
white              606          626           19         17.86 +/- 0.15
v                  829          849           19         17.07 +/- 0.25
b                  755          774           19         18.09 +/- 0.28
u                  326          576          246         16.95 +/- 0.06
w1                 705         1131           39         17.98 +/- 0.33
m2                 680         1106           58         18.12 +/- 0.35
w2                 631         1578          117         18.75 +/- 0.30

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).







---------------------------------------------

Dr Samantha Oates

Leverhulme Early Career Fellow
Department of Physics
University of Warwick
Coventry
CV4, UK
Tel:  +44 (024) 765 23383
Email: s.oates at warwick.ac.uk<mailto:s.oates at warwick.ac.uk>
-----------------------------------------------