The unusual X-ray emission of the short Swift GRB 090515: evidence for the formation of a magnetar?

Rowlinson A., O'Brien P. T., Tanvir N. R., Zhang B., Evans P. A., Lyons N., ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.409, sa.2, ss.531-540, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 409 Sayı: 2
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1111/j.1365-2966.2010.17354.x
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.531-540
  • Anahtar Kelimeler: gamma-ray burst: individual: 090515, stars: neutron, ENERGY INJECTION, OPTICAL AFTERGLOW, NEUTRON-STARS, HOST GALAXY, SPECTRAL LAGS, LIGHT CURVES, BURST, FLARES, DURATION, PROMPT
  • İstanbul Üniversitesi Adresli: Evet

Özet

The majority of short gamma-ray bursts (SGRBs) are thought to originate from the merger of compact binary systems collapsing directly to form a black hole. However, it has been proposed that both SGRBs and long gamma-ray bursts (LGRBs) may, on rare occasions, form an unstable millisecond pulsar (magnetar) prior to final collapse. GRB 090515, detected by the Swift satellite was extremely short, with a T-90 of 0.036 +/- 0.016 s, and had a very low fluence of 2 x 10(-8) erg cm(-2) and faint optical afterglow. Despite this, the 0.3-10 keV flux in the first 200 s was the highest observed for an SGRB by the Swift X-ray Telescope (XRT). The X-ray light curve showed an unusual plateau and steep decay, becoming undetectable after similar to 500 s. This behaviour is similar to that observed in some long bursts proposed to have magnetars contributing to their emission.