[vsnet-grb-info 17831] GRB 160410A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19275
SUBJECT: GRB 160410A: Swift/UVOT Detection
DATE:    16/04/10 17:40:46 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and S. L. Gibson (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160410A
91 s after the BAT trigger (Gibson et al., GCN Circ. 19271).
A source consistent with the initial UVOT position
(Gibson et al. GCN Circ. 19271), the enhanced XRT position
(Beardmore et al. GCN Circ. 19273), and the GROND position
(Yates et al. GCN Circ. 19272)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  10:02:44.37 = 150.68488 (deg.)
    Dec (J2000) = +03:28:42.7  =   3.47853 (deg.)
with an estimated uncertainty of 0.49 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits 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               91          241          147         19.46 +/- 0.10
v                 4867         6503          393        >19.7
b                 4251         5887          393        >20.2
u                  304        12411          866         20.50 +/- 0.20
w1                5277        11801         1082        >20.3
m2                5072        10893         1082        >20.8
w2                4662         6298          393        >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).