GCN Circular 36890

V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), D.N. Burrows
(PSU), J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB), C.
Salvaggio (INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of
the Swift-XRT team:

Swift-XRT has performed follow-up observations of the IPN-detected
burst GRB 240715A, collecting 4.7 ks of Photon Counting (PC) mode data
between T0+36.0 ks and T0+54.3 ks. 

Three 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 1:
  RA (J2000.0):  5.2342  =  00:20:56.20
  Dec (J2000.0): -36.5445  =  -36:32:40.1
  Error: 6.7 arcsec (radius, 90% conf.)
  Count-rate: (1.40 [+0.84, -0.62])e-3 ct s^-1	 
  Distance: 135 arcsec from IPN position.

Source 2:
  RA (J2000.0):  5.3550  =  00:21:25.20
  Dec (J2000.0): -36.6383  =  -36:38:17.9
  Error: 7.8 arcsec (radius, 90% conf.)
  Count-rate: (1.83 [+1.05, -0.78])e-3 ct s^-1	 
  Distance: 487 arcsec from IPN position.
  Flux: (3.3 [+1.9, -1.4])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 3:
  RA (J2000.0):  5.1463  =  00:20:35.12
  Dec (J2000.0): -36.3896  =  -36:23:22.4
  Error: 5.5 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (4.0 [+1.4, -1.2])e-3 ct s^-1   
  Distance: 595 arcsec from IPN position.
  Flux: (6.7 [+2.3, -1.9])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Further analysis is ongoing. 

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/00021699.

This circular is an official product of the Swift-XRT team.