TITLE: GCN CIRCULAR NUMBER: 29092 SUBJECT: GRB 201214A: Swift-XRT afterglow detection DATE: 20/12/19 19:28:30 GMT FROM: Aaron Tohuvavohu at U Toronto J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), B. Sbarufatti (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the INTEGRAL-detected burst GRB 201214A (Mereghetti et al. GCN Circ. 29037). The observations now extend from T0+5.3 ks to T0+378.1 ks. The source previously reported by Kennea et al. (GCN Circ. 29048), "Source 2", is fading with 3-sigma significance, and is therefore likely the GRB afterglow. Using 2671 s of PC mode data and 4 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 170.92446, +33.86930 which is equivalent to: RA (J2000): 11h 23m 41.87s Dec(J2000): +33d 52' 09.5" with an uncertainty of 2.2 arcsec (radius, 90% confidence). This position is 36 arcsec from the INTEGRAL position. The source is fading with alpha >0.6. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.7 (+0.9, -0.7). The best-fitting absorption column is 1.9 (+2.2, -1.6) x 10^21 cm^-2, in excess of the Galactic value of 2.4 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.6 x 10^-11 (2.6 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.9 (+2.2, -1.6) x 10^21 cm^-2 Galactic foreground: 2.4 x 10^20 cm^-2 Excess significance: 1.8 sigma Photon index: 2.7 (+0.9, -0.7) The results of the XRT-team automatic analysis of the likely afterglow are at https://www.swift.ac.uk/ToO_GRBs/00021406/Source2.php. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021406. This circular is an official product of the Swift-XRT team.