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GCN Circular 35054

GRB 231115A: archival Chandra X-ray observations
2023-11-16T05:14:29Z (6 months ago)
Albert Kong at NTHU <>
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A.K.H. Kong (NTHU), K.-L. Li (NCKU) report:

Following the discovery of GRB 231115A (GCN 35035) in the direction of M82 and its optical counterpart candidate AT 2023xvj (GCN 35041), we searched for X-ray emission from the progenitor with the Chandra X-ray Observatory. Chandra observed M82 with the ACIS detector 32 times between 2000 and 2016, with a total exposure time of about 561 ks. We combined all the observations and no source is visible at the position of the optical transient. We derive a 3-sigma luminosity limit of 2.3e37 erg/s (0.3-10 keV; D=3.5 Mpc) by assuming an absorbed power-law model with a photon index of 2. 
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