Gravitational wave event S250725l identified as highly probable BBH merger.

AI Summary

The event, detected by LIGO-Virgo-KAGRA, has a 98.5% probability of being a BBH merger, with a false alarm rate of 3e-08 Hz. Swift-BAT observed the area but found no associated gamma-ray emission.

Measurements

Notices (2)

LIGO-Virgo-KAGRA — GW · Fri, 25 Jul 2025 04:20:50 GMT

IceCube — NEUTRINO · Fri, 25 Jul 2025 04:20:50 GMT

GCN Circulars (4)

GCN-41203 — LIGO/Virgo/KAGRA S250725l · Wed, 30 Jul 2025 17:54:00 GMT
Swift/BAT, triggered by a LIGO/Virgo/KAGRA gravitational wave event alert, searched for gamma-ray emission and set upper limits using data from a 200-second window around the merger time. No signal was detected, and the results are available online.

GCN-41175 — LIGO/Virgo/KAGRA S250725l · Sun, 27 Jul 2025 11:06:08 GMT
The LIGO, Virgo, and KAGRA collaborations have updated the sky localization and distance estimate for a compact binary merger event, S250725l. The 90% credible region for the sky localization is 1532 deg2, and the distance is estimated to be 2567 +/- 766 Mpc.

GCN-41156 — LIGO/Virgo/KAGRA S250725l · Fri, 25 Jul 2025 04:54:50 GMT
A duplicate alert has been issued by Junjie Zhao at Henan Academy of Sciences regarding the identification of a gravitational wave compact binary merger candidate by LIGO, Virgo, and KAGRA.

GCN-41155 — LIGO/Virgo/KAGRA S250725l · Fri, 25 Jul 2025 04:53:42 GMT
The LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration have identified a compact binary merger candidate, S250725l, during real-time processing of data from their observatories. The event, which occurred on July 25, 2025, at 04:20:50.940 UTC, was detected by multiple analysis pipelines and has a false alarm rate of approximately one in a year and a half. The source is most likely a binary black hole merger, with a chirp mass falling in the range of (11.0, 22.0) solar masses. The initial localization of the source is available in two sky maps, with the preferred one covering 1990 square degrees. The estimated luminosity distance is 2186 +/- 673 Mpc.