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 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). I.A.S.F. INAF Mailing System Outgoing mail is certified Virus Free. Checked by Kaspersky anti-virus system