CHIME detects FRB 1170891025 with high SNR and extragalactic dispersion measure
AI Summary
The CHIME/FRB Real-time Search Pipeline detected a fast radio burst on 2026-07-23 at 21:02:43.478 UTC with a signal-to-noise ratio of 19.8 and high confidence (importance: 0.9999). The burst exhibits a dispersion measure of 244.6 ± 0.4 pc/cm³, significantly exceeding the Galactic maximum (44.0 pc/cm³) and indicating an extragalactic origin. The source is localized to RA 136.84°, Dec 30.06° with ~0.49° positional uncertainty, observed across the 400-800 MHz band. No follow-up observations or additional detections have been reported.
Measurements
| Event ID | 1170891025 |
|---|---|
| Source | CHIME |
| Alert type | FRB |
| Significance | medium |
| Trigger time (UTC) | Thu, 23 Jul 2026 21:02:43 GMT |
| Right ascension (J2000) | 136.8358152° |
| Declination (J2000) | 30.0615647° |
| Dispersion measure | 244.6464386 pc/cm³ |
| SNR | 19.8216896 |
| GCN notices | 1 |
| GCN circulars | 0 |
Notices (1)
CHIME — FRB · Thu, 23 Jul 2026 21:02:43 GMT
AI summary generated Mon, 27 Jul 2026 05:57:45 GMT.