TITLE: GCN CIRCULAR NUMBER: 35773 SUBJECT: EPW20240219aa is Likely a GRB Event DATE: 24/02/22 16:29:47 GMT FROM: Binbin Zhang at Nanjing U <bbzhang@nju.edu.cn> Binbin Zhang (NJU), Hui Sun (NAOC), Yi-Han Iris Yin (NJU), Jun Yang (NJU), Bing Zhang (NJU), Xuefeng Wu (PMO) report on behalf of large collaboration: 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/35773. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...