TITLE: GCN CIRCULAR NUMBER: 39039 SUBJECT: EP250125A: Non-detection from Fermi-GBM Observations DATE: 25/01/26 14:36:25 GMT FROM: mariaedvige.ravasio@ru.nl

M. E. Ravasio (Radboud Univ.), E. Burns (LSU), and P.G. Jonker (Radboud Univ.) report on behalf of the Fermi-GBM Team:

The location of the EP-WXT event EP250125A (Wu et al., GCN 39028) was occulted by the Earth for Fermi at the EP trigger time T0=2025-01-25T02:37:31 UTC, as well as at the starting time 2025-01-25T02:36:19 UTC (T0-72 s) of the event reported by Wu et al. (GCN 39028). There was no Fermi-GBM onboard trigger around EP-WXT times. The location becomes visible at around ~T0+174 s.

The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals, was run in the time interval [-50;+500] s from the EP starting time (T0-72 s), seeking signals between 64 ms and 32.768 s in duration. No signal consistent both temporally and spatially is identified, as confirmed by visual inspection of the data.

[1] Goldstein et al. 2019 arXiv:1903.12597

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