[vsnet-grb-info 18979] GRB 170117A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jan 19 21:39:03 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 20484
SUBJECT: GRB 170117A: Swift/UVOT Upper Limits
DATE: 17/01/19 12:38:02 GMT
FROM: Alice Breeveld at MSSL-UCL <a.breeveld at ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170117A
86251 s after the BAT trigger (Palmer, GCN Circ. 20480).
No optical afterglow consistent with the BAT position given in that
circular is detected in the initial UVOT exposures.
The preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial summed
exposures is:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 86251 116034 2654 >22.0
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.35 in the direction of the
burst (Schlegel et al. 1998).
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