GRB 210218A: Swift-XRT confirmation of afterglow
Abstract
Swift-XRT has performed follow up observations of GRB 210218A (Sbarufatti et al. GCN Circ. 29529). The Swift-BAT trigger happened while the burst position in the sky was Moon constrained for XRT and UVOT observations. A first follow up observation was performed when the target emerged from Moon constraint, with one uncatalogued X-ray source (source #3) detected inside the BAT error circle (Sbarufatti et al. GCN Circ. 29542). Swift-XRT observed the field again, for a further 4.7 ks, from T+497 ks to T+549 ks. Source #3 has faded below detection, with a 3-sigma upper limit of 2.5E-3 cts s^-1 (equivalent to 4.6E-14 erg cm^-2 s^-1 ), and is thus confirmed to be the burst afterglow. This circular is an official product of the Swift-XRT team.
- Publication:
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GRB Coordinates Network
- Pub Date:
- February 2021
- Bibcode:
- 2021GCN.29573....1S