TITLE: GCN CIRCULAR NUMBER: 36564 SUBJECT: GRB 240529A: Swift-XRT refined Analysis DATE: 24/05/29 14:50:35 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Tohuvavohu (U. Toronto) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 5.8 ks of XRT data for GRB 240529A, from 107 s to 19.1 ks after the BAT trigger. The data comprise 344 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.945 (+0.015, -0.025). The best-fitting absorption column is consistent with the Galactic value of 4.1 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.07 (+0.05, -0.04) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (6.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.06 (+0.15, -0.00) x 10^21 cm^-2 Galactic foreground: 4.1 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 2.07 (+0.05, -0.04) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01231488. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36564. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...