TITLE: GCN CIRCULAR NUMBER: 30877 SUBJECT: IceCube-210922A: No Candidate Counterparts from Swift/XRT follow up observations DATE: 21/09/24 20:52:44 GMT FROM: Hugo Ayala at Pennsylvania State University <hgayala@psu.edu> Felicia Krauss, Timothée Gregoire, Derek Fox, Doug Cowen, Hugo Ayala (PSU) and Alexis Coleiro (APC) report for AMON (https://amon.psu.edu/): The Neil Gehrels Swift Observatory X-ray Telescope (XRT) observed the uncertainty region of the IceCube neutrino event IceCube-210922A (GCN Circ. 30862) on 2021-09-23, between 02:00 and 21:52 UTC . A 6-point tiling observation centered on the neutrino position was taken for a total of 3.5 ksec. Of the 90% confidence 1.23 sq. degrees uncertainty region, the XRT observations cover roughly 75% of the central area. No X-ray candidate counterparts were detected above a level of 3 sigma. The 3 sigma upper limit for the flux is 1.2x10^(-13) ergs/s/cm^2.