[vsnet-grb-info 17598] GRB160220A: Swift/UVOT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19032
SUBJECT: GRB160220A: Swift/UVOT observations
DATE:    16/02/20 17:34:42 GMT
FROM:    Massimiliano de Pasquale at IASF-Palermo  <m.depasquale at ucl.ac.uk>

M. De Pasquale (MSSL-UCL) and A. Lien (GSFC/UMBC) report
on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160220A
4.11 ks after the BAT trigger (Lien et al., GCN Circ. 19023).
No optical afterglow consistent with the XRT position (Evans et al.
GCN Circ. 19025) is detected in the UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the
summed UVOT exposures are:

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

white             4110         5493          344         >20.6
v                 4268        34517          903         >19.4
b                 5088         5288          197         >19.7
u                 4882        17290          424         >19.5

w1                4678        17052         1175         >20.3
m2                4472        11445         1271         >20.3
w2                5499        32840         1177         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).