2026-09-05 15:42:20 UTC
JD 2461289.15
STATION 04 · MULTI-MESSENGER OBSERVATORY WIRE

High-Energy Transient Alert Desk

Continuous verification desk for extreme cosmological transients: gravitational waves from compact mergers, millisecond fast radio bursts, ultra-relativistic gamma-ray jets, and astrophysical PeV neutrinos.

Indexed Transients ⚡
14
Multi-messenger events catalogued
Deepest Cosmic Horizon REDSHIFT
z = 1.19
AT 2022cmc · 8.5 Billion light-years
Shortest Coherent Pulse DURATION
0.33 ms
FRB 20220610A · ASKAP detection
Max Photon Energy ENERGY
18 TeV
GRB 221009A · LHAASO gamma-ray
All Wire (14) Gravitational Wave (3) Fast Radio Burst (3) Gamma-Ray Burst (3) Supernova / Optical (2) Tidal Disruption Event (1) High-Energy Neutrino (2)
GW230529_181500
LIGO Livingston / KAGRA / Virgo (O4 Run)
Gravitational Wave
Sky Coordinates
13h 09m 24.0s · -24° 49' 12"
Luminosity Distance
650 Million ly (200 Mpc)
Constellation
Corvus / Hydra border
Redshift
z = 0.0450

Merger in the Lower Mass Gap: Neutron Star Collides with Mystery Compact Object

GW230529 represents a landmark gravitational wave detection by the LIGO-Virgo-KAGRA Collaboration during the O4 run. The primary component was determined to be 2.5 to 4.5 solar masses—placing it squarely in the elusive lower "mass gap" between known neutron stars and stellar-mass black holes. The secondary object was a 1.2 to 2.0 solar mass neutron star.

ZTF / DECam Fermi GBM Swift XRT
GW170817
LIGO Hanford, LIGO Livingston & Virgo
Gravitational Wave
Sky Coordinates
13h 09m 48.08s · -23° 22' 53.3"
Luminosity Distance
130 Million ly (40 Mpc)
Constellation
Hydra (NGC 4993)
Redshift
z = 0.0097

First Multi-Messenger Binary Neutron Star Merger & Kilonova

The foundational milestone of modern multi-messenger astronomy. The coalescence of two neutron stars was detected in gravitational waves, followed 1.7 seconds later by a short gamma-ray burst (GRB 170817A) detected by Fermi-GBM and INTEGRAL, and subsequently identified across the entire electromagnetic spectrum in host galaxy NGC 4993 as kilonova AT 2017gfo.

Fermi GBM / INTEGRAL Swope 1m / Magellan Chandra X-ray Observatory
GW190521
LIGO Hanford, LIGO Livingston & Virgo
Gravitational Wave
Sky Coordinates
12h 49m 36.0s · -26° 48' 00"
Luminosity Distance
17.3 Billion ly (5.3 Gpc)
Constellation
Coma Berenices / Virgo
Redshift
z = 0.8200

Intermediate-Mass Black Hole Formation in the Pair-Instability Gap

A short-duration gravitational wave burst (approx. 0.1 seconds) resulting from the collision of two massive black holes of 85 M☉ and 66 M☉. The primary black hole fell directly inside the pair-instability supernova mass gap, where stellar core-collapse theoretically cannot produce remnants. The remnant was a 142 M☉ intermediate-mass black hole.

ZTF Fermi LAT