 TheHubble Space Telescope caught the fading afterglow of GRB 190114C and its home galaxy on February 11 and March 12, 2019. The difference between these images reveals a faint, short-lived glow (center of the green circle) located about 800 light-years from the galaxy’s core. Blue colors beyond the core signal the presence of hot, young stars, indicating that this is aspiral galaxy somewhat similar to our own. The source of the burst is located about 4.5 billion light-years away in the direction of theconstellation Fornax. | |
| Event type | Gamma-ray burst  |
|---|---|
| Constellation | Delphinus |
| Right ascension | 03h 38m 1.63s[1] |
| Declination | −26° 56′ 48.1″[1] |
| Redshift | 0.4245 ±0.0005 |
| Other designations | GRB 190114C |
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GRB 190114C was an extremegamma-ray burst explosion from a galaxy 4.5 billion light years away (z=0.4245;[2] magnitude=15.60est[3]) near theFornax constellation,[4][5][6] that was initially detected in January 2019.[3][7] The afterglow light emitted soon after the burst was found to be tera-electron volt radiation frominverse Compton emission, identified for the first time.[8] According to the astronomers, "We observed a huge range of frequencies in the electromagnetic radiation afterglow of GRB 190114C. It is the most extensive to date for a gamma-ray burst."[8] Also, according to other astronomers, "light detected from the object had the highest energy ever observed for a GRB: 1Tera electron volt (TeV)—about one trillion times as much energy per photon as visible light";[4] another source stated, "the brightest light ever seen from Earth [to date]."[9]
Recent publications following the event indicate thatinverse Compton scattering is the mechanism responsible for producing TeV photons.[8] X-ray photons are scattered off of the GRB's polar jets of electrons, which move at 0.9999c. In a scattering event, much of the energy of a relativistic electron is transferred to a photon.[10][11][12][13] Researchers "have been trying to observe such very high energy emission from GRB's for a long time, so this detection is considered a milestone in high-energy astrophysics".[4][14]The most recent studies propose, in summary, amodel ofbinary system ofhypernova (BdHN I) with twoneutron stars, where one of them collapses in ablack hole, surrounded by anaccretion disk and from whose poles theGRB is launched.[15][16]
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