TITLE:   GCN CIRCULAR
NUMBER:  34782
SUBJECT: NuEm-230927A: Swift-XRT follow-up
DATE:    23/09/29 21:20:17 GMT
FROM:    Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>

The AMON group reports:

We requested follow-up time for the AMON alert NuEM230927A (GCN 34776).
The follow-up looks for any x-ray source inside the 90% region of the AMON
alert:
RA (J2000): 331.92 deg
Dec (J2000): 12.44 deg
Location uncertainty (90% containment): 0.24 deg (statistical only).

We used the available software in www.swift.ac.uk

Swift-XRT started the follow up on 2023-09-28 08:08:01 and ended
on 2023-09-28 11:32:27.
It collected 3735 sec of photon counting (PC) mode data.

One uncatalogued X-ray source has been detected:
Source :
  RA (J2000.0):  331.877  =  22:07:30.50
  Dec (J2000.0): 12.357  =  +12:21:24
  Error: 4.9 arcsec (radius, 90% conf.)
  Count-rate: (3.7 (+2.1, -1.7))e-3 ct s^-1

The results can be found in:
https://www.swift.ac.uk/user_objects/tprods/USERPROD_114407/index.php

Source detection is based on Evans, et al. 2020 ApJ Supplemental, 247

AMON seeks to perform a real-time correlation analysis of the
high-energy signals across all known astronomical messengers. More
information about AMON can be found in https://www.amon.psu.edu/
Information on the IceCube collaboration: http://icecube.wisc.edu/
Information on the HAWC collaboration: https://www.hawc-observatory.org