TITLE: GCN CIRCULAR NUMBER: 31013 SUBJECT: GRB 211024A: Swift-XRT observations DATE: 21/10/27 06:33:32 GMT FROM: Phil Evans at U of Leicester pae9@leicester.ac.uk
M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Swift/BAT-detected burst GRB 211024A (Aaron Tohuvavohu et al. GCN Circ. 31006), collecting 5.1 ks of Photon Counting (PC) mode data between T0+221.8 ks and T0+234.5 ks.
Four uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below:
Source 3: RA (J2000.0): 27.9803 = 01:51:55.28 Dec (J2000.0): -6.9611 = -06:57:39.9 Error: 9.0 arcsec (radius, 90% conf.) Count-rate: (1.24 [+0.76, -0.56])e-3 ct s^-1 Distance: 261 arcsec from Swift/BAT position. Flux: (4.0 [+2.4, -1.8])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 4: RA (J2000.0): 28.1958 = 01:52:47.00 Dec (J2000.0): -7.0082 = -07:00:29.4 Error: 3.3 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0146 [+0.0032, -0.0029] ct s^-1 Distance: 527 arcsec from Swift/BAT position. Flux: (3.49 [+0.76, -0.70])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 5: RA (J2000.0): 27.8881 = 01:51:33.14 Dec (J2000.0): -6.9512 = -06:57:04.2 Error: 6.8 arcsec (radius, 90% conf.) Count-rate: (1.21 [+0.83, -0.59])e-3 ct s^-1 Distance: 592 arcsec from Swift/BAT position.
Source 6: RA (J2000.0): 28.0277 = 01:52:6.65 Dec (J2000.0): -7.0969 = -07:05:48.8 Error: 7.5 arcsec (radius, 90% conf.) Count-rate: (1.60 [+0.87, -0.66])e-3 ct s^-1 Distance: 454 arcsec from Swift/BAT position.
A catalogued source was also detected.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021464.
This circular is an official product of the Swift-XRT team.