[vsnet-grb-info 15635] GRB 141017A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16924
SUBJECT: GRB 141017A: Swift/UVOT Detection
DATE:    14/10/18 11:06:06 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC/UCL-MSSL) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141017A
92 s after the BAT trigger (Marshall et al., GCN Circ. 16919).
A source consistent with the XRT position (Goad et al. GCN Circ. 16921) 
is detected in the initial UVOT white filter exposures.

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 (FC)          92          242          150         20.54 +/- 0.25
white              859         1009          159        >20.91
v                  633        13060          691        >20.0
b                  559        17991         1306        >21.4
u                  304         7171          717        >20.7
w1                 683         6966          471        >20.3
m2                5133         6761          388        >20.1
w2                6152        12850         1082        >21.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).