[vsnet-grb-info 18597] GRB 161014A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20045
SUBJECT: GRB 161014A: Swift/UVOT Detection
DATE:    16/10/15 10:59:41 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (U. of Warwick) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 161014A
4 ks after the BAT trigger (Racusin et al., GCN Circ. 20035).
A source consistent with the optical position reported by MITSuME (Morita et al GCN Circ 20036)
and LCOGT-FTS (Guidorzi et al., GCN Circ. 20037) is detected in the
initial UVOT exposures. The lack of detection in the u and UV bands
is consistent with the redshift of 2.823 reported by GTC
(de Ugarte Postigo et al., GCN Circ. 20043).

The preliminary UVOT position is:
    RA  (J2000) =  22:10:35.46 = 332.64775 (deg.)
    Dec (J2000) =   7:28:07.3  =   7.46869 (deg.)
with an estimated uncertainty of about 0.9 arc sec. (radius, 90% confidence).

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

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
wh       4491          4690          197       20.4 +/- 0.3
wh       5929          6129          197       > 20.85
v       4903          5103          197       19.1 +/- 0.4
b       4286          5924          393         20.3 +/- 0.3
u       4081          23870         1630        > 20.9
w1       5314          23503         1968        > 21.0
m2       5109          18128         1163        > 20.8
w2       4698          6335          393         > 20.2

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).