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GCN Circular 17226

Subject
Swift XRT and UVOT observations of GRB141222A
Date
2014-12-23T19:34:00Z (9 years ago)
From
Massimiliano de Pasquale at IASF-Palermo <mdp@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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