GRB 190804B: Swift-XRT afterglow detection
Abstract
Swift-XRT has conducted further observations of the field of the MAXI-detected burst GRB 190804B (Sato et al. GCN Circ. 25262). The observations now extend from T0+37.2 ks to T0+273.4 ks. Of the sources reported by Osborne et al. (GCN Circ. 25273), "Source 2" has faded from 1.1e-01 count/s to 1.1e-03 count/s between observations and is believed to be the afterglow. The position of this source (astrometrically enhanced by using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec=240.0251, -44.7816 which is equivalent to: RA (J2000): 16:00:6.02 Dec(J2000): -44:46:53.9 with an uncertainty of 3.8 arcsec (radius, 90% confidence). Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 177). This position is 5.6 arcmin from the MAXI position. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020916. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00082. This circular is an official product of the Swift-XRT team.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2019
- Bibcode:
- 2019GCN.25286....1O