EPW20240219aa is Likely a GRB Event
ATel #16473; Binbin Zhang (NJU), Hui Sun (NAOC), Yi-Han Iris Yin (NJU), Jun Yang (NJU), Bing Zhang (UNLV), Xuefeng Wu (PMO)
on 22 Feb 2024; 16:18 UT
Credential Certification: Binbin Zhang (bbzhang@nju.edu.cn)
Subjects: X-ray, Gamma Ray, Gamma-Ray Burst, Transient
Our team has followed up on EP's initial X-ray flare detection (EPW20240219aa; ATel 16463; ATel 16472) and discovered a weak, untriggered gamma-ray transient in the Fermi/GBM data at 2024-02-19T06:21:42 UTC. This transient lasted approximately 50 seconds and its location aligns with that of EPW20240219aa.
Considering the factors that the gamma-ray transient is consistent with EPW20240219aa in terms of event time, duration, and location, we are inclined to believe that this is a GRB event. A preliminary spectral analysis indicates that its peak energy reaches a few hundred keV, which further supports its classification as a GRB.
We strongly recommend further follow-up on EPW20240219aa to confirm its physical nature and to detect any afterglows.
