# \#gw **URL:** https://forum.astro-colibri.science/tag/gw/4.md [Latest](https://forum.astro-colibri.science/latest.md) · [Categories](https://forum.astro-colibri.science/categories.md) · [Tags](https://forum.astro-colibri.science/tags.md) --- ## [The end of O4: gravitational wave observations paused](https://forum.astro-colibri.science/t/the-end-of-o4-gravitational-wave-observations-paused/466)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 0\ **Last updated:** [November 19, 2025, 9:27am UTC](https://forum.astro-colibri.science/t/the-end-of-o4-gravitational-wave-observations-paused/466 "2025-11-19T09:27:41Z")
The observation run “O4” of the gravitational wave interferometers has come to its end as planned on November 18, 2025. The run has started on May 24th, 2023 and was thus the longest gravitational wave observing period s… --- ## [S250206dm: a intriguing multi-messenger event](https://forum.astro-colibri.science/t/s250206dm-a-intriguing-multi-messenger-event/330)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 4\ **Last updated:** [February 14, 2025, 12:50pm UTC](https://forum.astro-colibri.science/t/s250206dm-a-intriguing-multi-messenger-event/330 "2025-02-14T12:50:17Z")
An intriguing chain of events has been detected on February 6, 20205: It all started with S250206dm, a gravitational wave detected by both LIGO interferometers. It has rapidly been classified as being either a merger of… --- ## [Updated schedule of the gravitational wave detectors](https://forum.astro-colibri.science/t/updated-schedule-of-the-gravitational-wave-detectors/324)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 0\ **Last updated:** [January 26, 2025, 1:15pm UTC](https://forum.astro-colibri.science/t/updated-schedule-of-the-gravitational-wave-detectors/324 "2025-01-26T13:15:35Z")
The currently ongoing observation run (called O4b) of the gravitational wave observatories LIGO and VIRGO was meant to continue until June 9, 2025. This schedule has just been updated: an additional break for repairs wil… --- ## [Counterpart to the black hole merger S241125n](https://forum.astro-colibri.science/t/counterpart-to-the-black-hole-merger-s241125n/271)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 0\ **Last updated:** [November 25, 2024, 8:36pm UTC](https://forum.astro-colibri.science/t/counterpart-to-the-black-hole-merger-s241125n/271 "2024-11-25T20:36:17Z")
Possibly exciting news for multi-messenger astrophysics: The Swift/GUANO team analyzed data recorded by the BAT instrument onboard the Swift satellite. In a search spatially and temporally coincident with the gravitatio… --- ## [S240422ed: a neutron star + black hole merger](https://forum.astro-colibri.science/t/s240422ed-a-neutron-star-black-hole-merger/154)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 5\ **Last updated:** [July 3, 2024, 4:41pm UTC](https://forum.astro-colibri.science/t/s240422ed-a-neutron-star-black-hole-merger/154 "2024-07-03T16:41:58Z")
All three currently running gravitational wave interferometers jointly detected a very interesting event last night: named S240422ed, it is classified as a merger of a neutron star and a black hole. The event is well loc… --- ## [S240615dg: an extremely well localized GW event](https://forum.astro-colibri.science/t/s240615dg-an-extremely-well-localized-gw-event/193)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 1\ **Last updated:** [June 20, 2024, 7:53am UTC](https://forum.astro-colibri.science/t/s240615dg-an-extremely-well-localized-gw-event/193 "2024-06-20T07:53:05Z")
The GW event S240615dg has been detected by the LIGO and Virgo interferometers on 2024-06-15 11:36:20. It is classified as a merger of two black holes at a distance of 1321 ± 238 Mpc. What makes the event special, is it… --- ## [Gravitational wave observations paused](https://forum.astro-colibri.science/t/gravitational-wave-observations-paused/73)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 0\ **Last updated:** [January 16, 2024, 6:54pm UTC](https://forum.astro-colibri.science/t/gravitational-wave-observations-paused/73 "2024-01-16T18:54:01Z")
The first part of the O4 run of the LIGO interferometers detecting gravitational waves (GW) ended today. The instruments are now undergoing some minor improvements. Observations of GWs by LIGO and VIRGO (!) are schedule… --- ## [S231226av: a well-localized binary black hole merger](https://forum.astro-colibri.science/t/s231226av-a-well-localized-binary-black-hole-merger/20)
**Author:** [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Replies:** 0\ **Last updated:** [December 26, 2023, 4:54pm UTC](https://forum.astro-colibri.science/t/s231226av-a-well-localized-binary-black-hole-merger/20 "2023-12-26T16:54:59Z")
Mergers of binary objects like black holes are notoriously difficult to pinpoint on the sky when observing them with gravitational wave interferometers. Today, the two LIGO observatories detected and located S231226av, a…