GdR Gravitational Waves WG joint meeting: Source populations and Multi-messenger Astronomy

Session

Multimessenger follow-up and alert systems

16 nov. 2026, 14:00

Amphithéatre (IAP)

Présidents de session

Multimessenger follow-up and alert systems

• Marion Pillas (IAP)

4. Invited talk: Multimessenger in the LIGO-Virgo-KAGRA collaboration

Thomas JACQUOT (IJCLAB)

16/11/2026 14:00

MultiMessenger astronomy is some of the most exciting science that we can do with gravitational waves. The LIGO-Virgo-KAGRA (LVK) Collaboration searches for coincident gravitational wave event with an external counterpart and searches for coincident triggers in multiple external data channels (e.g. Neutrinos, Gamma Ray Bursts, Fast Radio Bursts, Soft Gamma Repeaters, pulsar glitches). Searches...

2. Contributed talk: Multimessenger astronomy with sub-solar mass neutron stars

Camille Allan (IP2I)

16/11/2026 14:30

The existence of sub-solar mass neutron stars remains uncertain, despite several theoretical scenarios for their formation. Assuming that such objects exist, could they be observed through multimessenger astronomy? The detection of a sub-solar mass neutron star through both gravitational-wave and electromagnetic signals would provide valuable insights into nuclear physics and the formation of...

15. Contributed talk: ET-WST synergy for next generation gravitational wave multi-messenger observations

Dr Sofia Bisero (Irfu, CEA-Saclay), Sofia Bisero (GEPI, Observatoire de Paris, Université PSL, CNRS)

16/11/2026 14:50

Third generation (3G) gravitational wave (GW) interferometers such as the Einstein Telescope (ET) and Cosmic Explorer (CE) will explore a larger volume of the Universe with respect to now, detecting up to 10$^{5}$ binary neutron star system mergers (BNS) per year and revolutionizing GW multi-messenger (MM) astrophysics. The error volume on the sky position of such BNS will be large and finding...

16. Invited talk: The Vera C. Rubin Observatory in Operation: First Results and Prospects for Multi-Messenger Astronomy

Roman Le Montagner

16/11/2026 15:40

After first light in 2025, the Vera C. Rubin Observatory formally began the 10-year Legacy Survey of Space and Time (LSST) on 29 June 2026. The public alert stream has been running since February 2026. In this talk I will give an overview of Rubin’s status and early science. I will start with the observatory, the survey strategy and the data products released so far, including the Data...

6. Contributed talk: KM3NeT alerts system

Jean-gregoire Ducoin (CPPM)

16/11/2026 16:10

KM3NeT is dedicated to detect and study neutrinos from distant astrophysical sources as well as from our own atmosphere. It is composed of the ARCA detector, located offshore Portopalo di Capo Passero, Sicily, Italy, at a depth of about 3,450 m and the ORCA detector, located at a depth of about 2,450 m, offshore Toulon, France. KM3NeT is under construction but already operational and its...

11. Contributed talk: Follow-up of gravitational events

Damien Turpin (CEA), Sarah ANTIER (IJCLAB)

16/11/2026 16:30

Due to the upcoming IR1 GW run, follow-up campaign will restart to identify the optical counterpart of GW events. After briefly presenting the alert system for IR1, I will come back to observing strategies for IR1, especially since LSST and SVOM are both taking data.

14. Contributed talk: Benchmarking the expected performance of Bayesian parameter inference on Kilonovae

Thomas Hussenot

16/11/2026 16:50

In the study of optical transients, parameter inference is a part of the process of extracting physical information, i.e. constraints on the source's characteristics, by comparing the observed lightcurves to the predictions of different astrophysical models and finding the model and parameter combination that make the closest match.
In the developing field of the study of kilonovae (KN),...