(short flashes of gamma rays apparently from outside our galaxy)
A gamma-ray burst (GRB) is a short flash of gamma rays,
lasting from a few milliseconds to several minutes,
often followed by an afterglow (GRB afterglow) of longer-wavelength
radiation. Roughly half are accompanied by a
visible transient (GRB optical transient),
the others being termed dark bursts.
Some show such extreme energy that it is presumed that the source
emits them directionally, i.e., they cannot be from an
GRBs were first detected in
1967 by satellites intended to detect nuclear weapons tests.
A significant part of gamma-ray astronomy is detection and study of the
bursts, and gamma ray observatory satellites have invariably
included burst detectors.
Presumed sources (GRB progenitors, gamma-ray burst progenitors)
include supernovae, magnetars, and/or
mergers of neutron stars. The latter is theorized
as a cause of short gamma ray bursts (SGRB), i.e.,
those lasting less than two seconds.
Superluminous supernovae are theorized to create long gamma ray bursts (LGRB),
i.e., more than two seconds.
Thus GRB light curves are part of their study.
GBS for gamma-ray burst source or gamma burst source
used for bodies such as pulsars presumed to be sources.
Some bursts have been termed FRED GRBs
for fast rise exponential decay GRBs.
An orphan afterglow (orphan GRB afterglow) is the appearance
of an afterglow not subsequent to an apparent GRB. The presumption
is that the GRB gamma rays are highly beamed but the afterglow
spreads a bit wider, so we can observe the afterglow of some GRBs
that miss us.
(EMR,gamma rays,event type,transient type)
|Prefix||Example|| || |
|GBS||GBS 0525-66||or GRB, "gamma burst source"|| |
|GRB||GRB 170817A||general GRB prefix|| |
Referenced by pages:
Compton Gamma Ray Observatory (CGRO)
Fenton Hill Observatory (FHO)
gamma rays (GR)
habitable zone (HZ)
high-B radio pulsar (HBRP)
high-energy astrophysics (HEA)
Hercules-Corona Borealis Great Wall (Her-CrB GW)
High Energy Transient Explorer (HETE)
hypermassive neutron star (HMNS)
International Cometary Explorer (ICE)
Livermore Optical Transient Imaging System (LOTIS)
MASTER Robotic Net
Pi of the Sky
Pioneer Venus Orbiter (PVO)
soft gamma repeater (SGR)
superluminous supernova (SLSN)
Transiting Exoplanet Survey Satellite (TESS)
X-ray burster (XRB)