Prompt optical detection of GRB 050401 with ROTSE-IIIa


Rykoff E., Yost S., Krimm H., Aharonian F., Akerlof C., Alatalo K., ...Daha Fazla

ASTROPHYSICAL JOURNAL, cilt.631, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 631 Konu: 2
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1086/497370
  • Dergi Adı: ASTROPHYSICAL JOURNAL

Özet

The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detected prompt optical emission from Swift GRB 050401. We present observations of the early optical afterglow, first detected by the ROTSE-IIIa telescope 33 s after the start of gamma-ray emission, contemporaneous with the brightest peak of this emission. This GRB was neither exceptionally long nor bright. This is the first prompt optical detection of a GRB of typical duration and luminosity. We find that the early afterglow decay does not deviate significantly from the power-law decay observable at later times and is uncorrelated with the prompt gamma-ray emission. We compare this detection with the other two GRBs with prompt observations, GRB 990123 and GRB 041219a. All three bursts exhibit quite different behavior at early times.