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  A bright γ-ray flare interpreted as a giant magnetar flare in NGC 253

Svinkin, D., Frederiks, D., Hurley, K., Aptekar, R., Golenetskii, S., Lysenko, A., et al. (2021). A bright γ-ray flare interpreted as a giant magnetar flare in NGC 253. Nature, 589(7841), 211-213. doi:10.1038/s41586-020-03076-9.

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Svinkin, D., Author
Frederiks, D., Author
Hurley, K., Author
Aptekar, R., Author
Golenetskii, S., Author
Lysenko, A., Author
Ridnaia, A. V., Author
Tsvetkova, A., Author
Ulanov, M., Author
Cline, T. L., Author
Mitrofanov, I., Author
Golovin, D., Author
Kozyrev, A., Author
Litvak, M., Author
Sanin, A., Author
Goldstein, A., Author
Briggs, M. S., Author
Wilson-Hodge, C., Author
Kienlin, A. von1, Author              
Zhang, X.-L.1, Author              
Rau, A.1, Author              Savchenko, V., AuthorBozzo, E., AuthorFerrigno, C., AuthorUbertini, P., AuthorBazzano, A., AuthorRodi, J. C., AuthorBarthelmy, S., AuthorCummings, J., AuthorKrimm, H., AuthorPalmer, D. M., AuthorBoynton, W., AuthorFellows, C. W., AuthorHarshman, K. P., AuthorStarr, H. Enos & R., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Soft γ-ray repeaters exhibit bursting emission in hard X-rays and soft γ-rays. During the active phase, they emit random short (milliseconds to several seconds long), hard-X-ray bursts, with peak luminosities of 1036 to 1043 erg per second. Occasionally, a giant flare with an energy of around 1044 to 1046 erg is emitted. These phenomena are thought to arise from neutron stars with extremely high magnetic fields (1014 to 1015 gauss), called magnetars. A portion of the second-long initial pulse of a giant flare in some respects mimics short γ-ray bursts , which have recently been identified as resulting from the merger of two neutron stars accompanied by gravitational-wave emission. Two γ-ray bursts, GRB 051103 and GRB 070201, have been associated with giant flares. Here we report observations of the γ-ray burst GRB 200415A, which we localized to a 20-square-arcmin region of the starburst galaxy NGC 253, located about 3.5 million parsecs away. The burst had a sharp, millisecond-scale hard spectrum in the initial pulse, which was followed by steady fading and softening over 0.2 seconds. The energy released (roughly 1.3 × 1046 erg) is similar to that of the superflare from the Galactic soft γ-ray repeater SGR 1806−20 (roughly 2.3 × 1046 erg). We argue that GRB 200415A is a giant flare from a magnetar in NGC 253.

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Language(s): eng - English
 Dates: 2021-01-13
 Publication Status: Published online
 Pages: -
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 Identifiers: DOI: 10.1038/s41586-020-03076-9
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 589 (7841) Sequence Number: - Start / End Page: 211 - 213 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238