Table 2.
Recent examples of GRBs, with X-ray emissions detected by EP long before the prompt gamma-ray emission.
| EP name | GRB name | Trigger Time EP | GRB Trigger time | Delay(a) | References(b) | T0(c) |
|---|---|---|---|---|---|---|
| (UT) | (UT) | (s) | (s) | |||
| EP240315a | 240315C | 20:10:44 | 20:16:54 | 370 | (1) | N/A |
| EP240802a | 240802A | 10:32:52 | 10:34:03 | 71 | (2,3) | N/A |
| EP240913a | 240913C | 11:39:33 | 11:42:36 | 183 | (4,5) | N/A |
| EP241026a | 241026A | 22:41:28 | 22:42:32 | 64 | (6,7) | N/A |
| EP241213a(d) | 241213A | 02:17:15 | 02:19:00 | 105 | (8,9) |  |
| EP250615a(d) | 250615A | 22:25:17 | 22:25:20 | 3 | (10,11) | < 13 |
Notes. (a)Calculated as tγ − tX, where tγ and tX are the GRB trigger time and the EP X-ray trigger time, respectively. (b) (1) Liu et al. (2025); (2) Wang et al. (2024); (3) SVOM/GRM Team et al. (2024a); (4) Li et al. (2024a); (5) Bissaldi et al. (2024); (6) Li et al. (2024b); (7) SVOM/GRM Team et al. (2024b); (8) Zhou et al. (2024); (9) Gupta et al. (2024); (10) Yang et al. (2025); and (11) Dichiara et al. (2025). (c)T0 in the observer frame; redshift unavailable. The upper limit is given at 90% confidence. (d) Thanks to the prompt follow-up with Swift/XRT, it is possible to model the early X-ray emission and test the prior activity model. For this reason, we included EP250615a despite the small delay between the X- and gamma rays.
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