Two international teams of astronomers from the CHIME and STARE2 projects recorded extraordinary activity of SGR 1935 + 2154 on April 28 this year. Astronomers have decided that this is probably the analogue of the so-called fast radio bursts, which for the first time in history come from our native galaxy. It is important that simultaneously the flash was recorded in the gamma range using a number of space instruments: the Russian Cone Wind, European INTEGRAL and AGILE, Chinese Insight-HMXT. Following that event, the object became the object of observation for the Swift space telescope, the NICER instrument mounted on ISS and other instruments and for radio telescopes around the world.
After a month, the researchers were able to see two short radio flashes, separated only one and a half seconds, which is less time this magnet (a neutron star with a very large magnetic field) around its axis.
“The source of the soft repetitive gamma-ray bursts of SGR 1935+2154 made a noise. The main focus, of course, was the April flare, which was simultaneously recorded in the hard band and radio. But the source was in a high stage of activity at this time, and there were many hard bursts. However, recent observations did not record a simultaneous spike in the hard band. Which is not surprising, because new radio outbreaks are much weaker than those in April. And if the X-ray flux is smaller this time as much as the radio flux, our instruments simply will not see it,” says astrophysicist, Professor of the Russian Academy of Sciences Sergei Popov.
Scientists are not yet ready to state that the mystery of fast radio bursts has been solved. They are confused by the power of the signal, because only for those close to SGR 1935 + 2154 Earth telescopes it seems strong, and outside the Galaxy it would be barely visible. The April flash falls within the energy range currently set for fast radio bursts at its lowermost border. So doubts remain as to whether the SGR 1935 + 2154 magnet showed a complete analogue of a space fast radio burst.