TITLE: GCN CIRCULAR NUMBER: 40891 SUBJECT: Fermi GBM Triggers 250702B, C, D and E are likely from the same source DATE: 25/07/02 19:04:27 GMT FROM: eliza.neights@gmail.com E. Neights (GWU, NASA GSFC), O.J. Roberts (USRA, NASA MSFC), E. Burns (LSU), P. Veres (UAH) report on behalf of the Fermi-GBM Team: At 13:09:02.03 UT, Fermi GBM triggered on GRB 250702D and was initially localized to an RA and Dec of 292.9 and 3.6 (19h, 31m, +03,33’; J2000), with an error of 14.7 deg. The light curve shows several peaks occurring over ~60 seconds. Since then, an additional three bursts have triggered GBM with similar lightcurve characteristics and localizations. The trigger times and localizations are summarized as follows: GRB Name MET (s) Time (UT) RA (deg) Dec (deg) Err (deg) 250702E 773166098 16:21:33.07 286.8 -17.7 11.6 (GCN 40890) 250702C 773160576 14:49:31.91 270.3 1.4 12.7 (GCN 40885) 250702B 773157370 13:56:05.77 286.0 -8.7 7.8 (GCN 40883) 250702D 773154547 13:09:02.03 292.9 3.6 14.7 (GCN 40886) Despite the similar position lying close to or on the galactic plane, we observe photons in the BGO up to 1 MeV, with the majority of the photons occurring in the 50-300 keV range, which suggest the source may not be a typical galactic source and might be an ultra-long GRB or another source class. If a GRB origin is confirmed, it is 11.5 ks long, making it one of the longest ultra-long GRBs detected. The combined GBM skymap can be found here: https://zenodo.org/records/15793558. The skymaps are all associated with each other with confidence between 89.2 and 98.5%. There were no joint-GW detections during these triggered times. We strongly suggest follow-up of the region to determine the nature of the source over multiple wavelengths. View this GCN Circular online at https://gcn.nasa.gov/circulars/40891. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...