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| Short gamma-ray bursts | |
|---|---|
| Name | Short gamma-ray bursts |
| Duration | "< 2 seconds (typical)" |
| Progenitors | "Compact binary mergers (neutron star–neutron star, neutron star–black hole)" |
| First observed | "1970s (Vela satellites)" |
| Detection | "Gamma-ray observatories, gravitational-wave detectors" |
Short gamma-ray bursts are intense flashes of gamma-ray photons with prompt durations typically under two seconds, characterized by hard spectra and rapid variability. They were first hinted at by the Vela (satellite) program and later classified in observational studies by the Compton Gamma Ray Observatory and the Burst and Transient Source Experiment. Short bursts have been central to multi-messenger astronomy through joint detections with facilities such as LIGO, Virgo, and space observatories including Fermi Gamma-ray Space Telescope and Neil Gehrels Swift Observatory.
Short bursts form one of the two canonical classes in the empirical taxonomy established from BATSE data alongside long bursts associated with events like GRB 980425 and SN 1998bw. The defining phenomenological criterion—prompt emission shorter than ~2 s—was popularized in studies by teams at NASA and the Max Planck Institute for Extraterrestrial Physics. Beyond duration, short bursts display harder spectral energy distributions and often negligible accompanying supernova signatures, distinguishing them from the long-duration population linked to events such as Type Ic supernovae and surveys by the Sloan Digital Sky Survey.
The leading progenitor channel for short bursts is the merger of compact-object binaries, specifically double neutron star systems exemplified by the binary pulsar PSR B1913+16 analogues and neutron star–black hole pairs influenced by dynamics within systems like NGC 4993. Such mergers were predicted in theoretical work by researchers at institutions including Caltech and MIT and were observationally confirmed in the multi-messenger event associated with detectors LIGO and Virgo and the electromagnetic counterpart observed by teams using Hubble Space Telescope, Chandra X-ray Observatory, and ground-based facilities such as Gemini Observatory. The compact merger produces an accreting compact remnant—either a hypermassive neutron star or a nascent black hole—powering a relativistic jet through mechanisms involving the Blandford–Znajek process or magnetically driven winds studied by groups at Princeton University and University of California, Berkeley.
Prompt gamma-ray spectra are often modeled with empirical functions like the Band function and exhibit peak energies in the hard X-ray to soft gamma-ray band, as characterized by instruments on Fermi and Swift. Short bursts show high-energy emission extending to the GeV regime in cases monitored by Fermi Large Area Telescope, with temporal structures down to millisecond scales recorded by the Konus-Wind experiment. Polarization measurements attempted by collaborations including POLAR and proposals from IXPE aim to constrain jet composition and magnetic field topology, while localization capabilities from networks involving INTEGRAL and AGILE enabled rapid follow-up by optical facilities such as Keck Observatory and Very Large Telescope.
Afterglows in X-ray, optical, and radio bands were first associated with short bursts through swift follow-up, with X-ray observations by Chandra and XMM-Newton and optical imaging by Hubble Space Telescope and ground-based observatories detecting fading counterparts. Radio detections by arrays like the Karl G. Jansky Very Large Array provided constraints on kinetic energy and ambient density, while infrared and optical transient emission consistent with kilonovae were modeled after nuclear synthesis work from researchers at University of Copenhagen and Monash University. The joint electromagnetic and gravitational-wave detection of GW170817 by LIGO/Virgo with the counterpart observed by teams at Pan-STARRS, Subaru Telescope, and Las Cumbres Observatory provided decisive evidence linking kilonova emission, r-process nucleosynthesis, and jet-driven afterglows.
Short bursts occur in a diverse set of host galaxies, including early-type ellipticals identified in surveys by Hubble Space Telescope and late-type spirals catalogued by Sloan Digital Sky Survey. Hosts such as NGC 4993 illustrate occurrences in evolved stellar populations, while other events are located in star-forming galaxies studied by teams at European Southern Observatory and Carnegie Observatories. Offsets of burst locations from host centers, measured using precise astrometry from HST and radio interferometry from VLBI, reflect binary natal kicks and long inspiral timescales predicted by population synthesis groups at University of Cambridge and Australian National University.
Local volumetric rates estimated from survey data of Swift and Fermi and informed by gravitational-wave detections by LIGO/Virgo suggest merger rates comparable to predictions from binary evolution models developed at Northwestern University and Yale University. Short bursts are observed across a broad redshift range, with measured redshifts from host spectroscopy by Keck Observatory and Very Large Telescope enabling cosmological population studies and comparisons with long bursts cataloged by BATSE. The combination of electromagnetic selection effects and gravitational-wave sensitivity shapes the inferred redshift distribution explored by consortia including LSST planning teams and the Einstein Telescope design studies.
Numerical relativity and magnetohydrodynamic simulations from groups at Max Planck Institute for Gravitational Physics and Princeton University model inspiral, merger, and post-merger accretion leading to jet launching, using codes developed alongside collaborations at Flatiron Institute and Los Alamos National Laboratory. Nuclear reaction network calculations relevant to kilonova light curves have been advanced by researchers at Lawrence Berkeley National Laboratory and University of Tokyo, connecting r-process yields to observed spectral features. Radiation transfer and jet propagation models by teams at Stanford University and University of Illinois Urbana-Champaign continue to refine predictions for prompt spectra, polarization, and afterglow light curves tested against observations from Fermi, Swift, and multiwavelength facilities worldwide.
Category:Gamma-ray bursts