4.7 Article

MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B*

期刊

ASTROPHYSICAL JOURNAL
卷 908, 期 1, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.3847/1538-4357/abd249

关键词

Gamma-ray bursts

资金

  1. German BMBF
  2. German MPG
  3. Italian INFN
  4. Italian INAF
  5. Swiss National Fund SNF
  6. ERDF under the Spanish MINECO [FPA2017-87859-P, FPA2017-85668-P, FPA2017-82729-C6-2-R, FPA2017-82729-C6-6-R, FPA2017-82729-C6-5-R, AYA2015-71042-P, AYA2016-76012-C3-1-P, ESP2017-87055-C2-2-P, FPA2017-90566-REDC]
  7. Indian Department of Atomic Energy
  8. Japanese ICRR
  9. Japanese University of Tokyo
  10. Japanese JSPS
  11. Japanese MEXT
  12. Bulgarian Ministry of Education and Science, National RI Roadmap Project [DO1-268/16.12.2019]
  13. Academy of Finland [320045]
  14. Spanish Centro de Excelencia Severo Ochoa [SEV-2016-0588, SEV-2015-0548, SEV-2012-0234]
  15. Unidad de Excelencia Maria de Maeztu [MDM-2014-0369]
  16. la Caixa Foundation [LCF/BQ/PI18/11630012]
  17. Croatian Science Foundation (HrZZ) Project [IP-2016-06-9782]
  18. University of Rijeka Project [13.12.1.3.02]
  19. DFG Collaborative Research Centers [SFB823/C4, SFB876/C3]
  20. Polish National Research Centre grant [UMO-2016/22/M/ST9/00382]
  21. Brazilian MCTIC
  22. Brazilian CNPq
  23. Brazilian FAPERJ
  24. Marie Sklodowska-Curie actions (H2020-MSCA-COFUND-2014, Project P-Sphere) [GA 665919]
  25. JSPS KAKENHI grant from MEXT, Japan [JP20KK0067]
  26. European Union [664931]
  27. JSPS KAKENHI from MEXT, Japan [JP17K05460]
  28. RIKEN iTHEMS program
  29. Istituto Nazionale di Astrofisica in Italy
  30. Centre National d'Etudes Spatiales in France
  31. DOE [DE-AC02-76SF00515]

向作者/读者索取更多资源

The coincident detection of GW170817 in gravitational waves and electromagnetic radiation provided direct evidence of short gamma-ray bursts originating from binary neutron star mergers. Through high-energy observations such as in the case of GRB 160821B, we can gain better insight into the nature and origin of short GRBs, particularly those associated with BNS mergers. Further studies and future observations in the GeV-TeV bands are crucial for advancing our understanding in this field.
The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided the first direct evidence that short gamma-ray bursts (GRBs) can originate from binary neutron star (BNS) mergers. On the other hand, the properties of short GRBs in high-energy gamma-rays are still poorly constrained, with only similar to 20 events detected in the GeV band, and none in the TeV band. GRB 160821B is one of the nearest short GRBs known at z = 0.162. Recent analyses of the multiwavelength observational data of its afterglow emission revealed an optical-infrared kilonova component, characteristic of heavy-element nucleosynthesis in a BNS merger. Aiming to better clarify the nature of short GRBs, this burst was automatically followed up with the MAGIC telescopes, starting from 24 s after the burst trigger. Evidence of a gamma-ray signal is found above similar to 0.5 TeV at a significance of similar to 3 sigma during observations that lasted until 4 hr after the burst. Assuming that the observed excess events correspond to gamma-ray emission from GRB 160821B, in conjunction with data at other wavelengths, we investigate its origin in the framework of GRB afterglow models. The simplest interpretation with one-zone models of synchrotron-self-Compton emission from the external forward shock has difficulty accounting for the putative TeV flux. Alternative scenarios are discussed where the TeV emission can be relatively enhanced. The role of future GeV-TeV observations of short GRBs in advancing our understanding of BNS mergers and related topics is briefly addressed.

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