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| Long gamma-ray bursts | |
|---|---|
| Name | Long gamma-ray bursts |
| Duration | >2 seconds |
| Progenitor | Massive stellar collapse |
| Associated | Type Ic supernovae |
| First observed | 1967 (Vela satellites) |
| Detectors | BATSE, BeppoSAX, Swift, Fermi |
Long gamma-ray bursts are a class of high-energy transients characterized by prompt gamma-ray emission lasting longer than about two seconds and by luminous multiwavelength afterglows. Discovered by Vela satellites and defined observationally by instruments such as BATSE and Swift, they are linked to the core collapse of massive, rapidly rotating stars and to energetic Type Ic supernovae. Long gamma-ray bursts are cosmological probes used in studies involving Hubble Space Telescope, Chandra X-ray Observatory, and Very Large Telescope observations.
Long gamma-ray bursts were separated from short bursts in surveys performed by BATSE and further localized by BeppoSAX enabling follow-up by Keck Observatory, Gemini Observatory, and Very Large Array. They exhibit prompt emission with complex light curves recorded by instruments aboard Compton Gamma Ray Observatory, Swift, and Fermi and have isotropic-equivalent energies that can exceed 10^54 erg in events observed by Konus-Wind. Long bursts preferentially occur at redshifts measured with Keck Observatory and Very Large Telescope spectroscopy, with notable detections in the fields of Hubble Space Telescope deep surveys and in association with cataloged supernovae such as the one linked to GRB 980425.
Leading progenitor models invoke the collapse of massive, low-metallicity, rapidly rotating stars, often referred to in the literature through studies involving Wolf–Rayet stars and models developed by research groups at Caltech, Princeton University, and University of California, Berkeley. The collapsar model, articulated by teams including Stan Woosley and Andrew MacFadyen, describes black hole formation and relativistic jet launching aided by accretion disks and magnetic fields studied in magnetohydrodynamics simulations conducted at Max Planck Institute for Astrophysics and Lawrence Berkeley National Laboratory. Alternative channels explored by theorists at MIT and Harvard–Smithsonian Center for Astrophysics include magnetar models invoking rapidly spinning neutron stars, with magnetic mechanisms investigated by groups at Northwestern University and University of Chicago.
Prompt emission spectra and temporal structure have been characterized by instruments from CGRO to Fermi and analyzed by teams at NASA Goddard Space Flight Center and European Space Agency. Spectral parameters such as peak energy are often reported from joint fits by Swift and Fermi, with polarization studies pursued by missions like INTEGRAL and observatories including Rossi X-ray Timing Explorer. Light curve morphologies, variability timescales, and high-energy components have been cataloged by collaborations at Los Alamos National Laboratory and Max Planck Institute for Extraterrestrial Physics.
Afterglows spanning X-ray, optical, infrared, and radio bands are regularly observed by facilities such as Chandra X-ray Observatory, Hubble Space Telescope, Spitzer Space Telescope, Very Large Array, and Atacama Large Millimeter/submillimeter Array. Rapid-response follow-up by teams operating Swift and ground-based observatories including Liverpool Telescope and Keck Observatory probes jet physics, circumburst medium properties, and reverse-shock signatures. Multiwavelength campaigns coordinated through networks like Gamma-ray Burst Coordinates Network and institutions at University of Leicester and University of Amsterdam enable modeling of afterglow light curves within frameworks developed by researchers at University of Oxford and University of California, Santa Cruz.
Host galaxies of long bursts are typically star-forming, low-metallicity systems identified in surveys by Hubble Space Telescope and ground-based efforts at Very Large Telescope and Subaru Telescope. Studies led by groups at Max Planck Institute for Astronomy and University of Hawaii map host stellar masses, star-formation rates, and metallicities using instruments like Keck Observatory and Gemini Observatory. Environments span compact dwarf galaxies to outskirts of larger systems cataloged in surveys such as the Sloan Digital Sky Survey and follow-up programs associated with European Southern Observatory.
A subset of long bursts is spectroscopically associated with energetic stripped-envelope supernovae, notably Type Ic broad-lined events identified via coordinated observations using Keck Observatory, Very Large Telescope, and Hubble Space Telescope. Landmark associations include GRB–supernova links reported by teams at Caltech and Max Planck Institute for Astronomy for events like GRB 980425/SN 1998bw and subsequent associations studied by groups at University of Tokyo and Monash University. These connections underlie the collapsar framework and inform nucleosynthesis, explosion energetics, and progenitor evolution modeled at Los Alamos National Laboratory and University of Cambridge.
Long bursts serve as probes of star formation history and reionization studied using data from Hubble Space Telescope, Spitzer Space Telescope, and deep-field surveys by James Webb Space Telescope and Chandra X-ray Observatory. Rate estimates derived from Swift catalogs and population synthesis from teams at University of Oxford and McGill University constrain cosmic star-formation rates and metallicity evolution, with implications for studies by Planck (spacecraft) and large surveys like Sloan Digital Sky Survey.
Key theoretical work on jet dynamics, radiation mechanisms, and progenitor evolution has been carried out at centers including Caltech, Princeton University, Harvard–Smithsonian Center for Astrophysics, and Max Planck Institute for Astrophysics. Open questions concern jet composition, magnetic reconnection, role of magnetic fields studied at Perimeter Institute and Institute for Advanced Study, rates versus metallicity tracked by teams at University of Cambridge and University of Edinburgh, and the diversity of supernova associations explored by research groups at National Astronomical Observatory of Japan and Instituto de Astrofísica de Canarias. Continued observations by Swift, Fermi, and upcoming missions coordinated with James Webb Space Telescope and ground-based arrays will test models developed across these institutions.
Category:Gamma-ray bursts