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Journal Article
A fast radio burst associated with a Galactic magnetar
2020
Overview
Since their discovery in 2007
1
, much effort has been devoted to uncovering the sources of the extragalactic, millisecond-duration fast radio bursts (FRBs)
2
. A class of neutron stars known as magnetars is a leading candidate source of FRBs
3
,
4
. Magnetars have surface magnetic fields in excess of 10
14
gauss, the decay of which powers a range of high-energy phenomena
5
. Here we report observations of a millisecond-duration radio burst from the Galactic magnetar SGR 1935+2154, with a fluence of 1.5 ± 0.3 megajansky milliseconds. This event, FRB 200428 (ST 200428A), was detected on 28 April 2020 by the STARE2 radio array
6
in the 1,281–1,468 megahertz band. The isotropic-equivalent energy released in FRB 200428 is 4 × 10
3
times greater than that of any radio pulse from the Crab pulsar—previously the source of the brightest Galactic radio bursts observed on similar timescales
7
. FRB 200428 is just 30 times less energetic than the weakest extragalactic FRB observed so far
8
, and is drawn from the same population as the observed FRB sample. The coincidence of FRB 200428 with an X-ray burst
9
–
11
favours emission models that describe synchrotron masers or electromagnetic pulses powered by magnetar bursts and giant flares
3
,
4
,
12
,
13
. The discovery of FRB 200428 implies that active magnetars such as SGR 1935+2154 can produce FRBs at extragalactic distances.
Observations of the fast radio burst FRB 200428 coinciding with X-rays from the Galactic magnetar SGR 1935+2154 indicate that active magnetars can produce fast radio bursts at extragalactic distances.
