[vsnet-grb-info 15938] Swift XRT and UVOT observations of GRB141222A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17226
SUBJECT: Swift XRT and UVOT observations of GRB141222A
DATE:    14/12/23 19:34:00 GMT
FROM:    Massimiliano de Pasquale at IASF-Palermo  <mdp at ifc.inaf.it>

M. De Pasquale (IASF/INAF Palermo) and M. Siegel (PSU) report on behalf of the Swift-XRT team:

We have analysed 4.7 ks of XRT data for GRB 141222A, detected by the Fermi/LAT
(McEnery et al. GCN 17218), Fermi/GBM (Jenke et al., GCN 17220) and IPN (Svinkin et al.
GCN 17223), from 42.0 ks to 53.4 ks after the Fermi/LAT trigger. The data are entirely
in Photon Counting (PC) mode. No source is detected within the LAT error circle; we
determined a 3 sigma upper limit of 2.3e-3 count/s at the LAT coordinates.
 
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020454.

The Swift/UVOT began settled observations of the field of GRB 141222
41986 s after the LAT trigger.  No optical afterglow is detected in the initial UVOT
exposures within the LAT error circle.  Preliminary 3-sigma upper limits using the
UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the
initial exposures are:

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

v                41986        53434         2510         >20.5
u                43226        50158         2375         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.42 in the direction of the burst
(Schlegel et al. 1998).
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