Hubble Space Telescope Imaging of the Optical Transient Associated with GRB 970508

  title={Hubble Space Telescope Imaging of the Optical Transient Associated with GRB 970508},
  author={Elena Pian and Andrew S. Fruchter and Louis E. Bergeron and Stephen Erik Thorsett and Fillippo Frontera and Marco Tavani and E. Costa and Marco Feroci and Jules P. Halpern and Ray A. Lucas and Luciano Nicastro and Eliana Palazzi and Luigi Piro and William B. Sparks and Alberto J. Castro-Tirado and Theodore Gull and Kevin Hurley and Holger Pedersen},
  journal={The Astrophysical Journal Letters},
  pages={L103 - L106}
We report on Hubble Space Telescope observations of the optical transient (OT) discovered in the error box of the gamma-ray burst GRB 970508. The object was imaged on 1997 June 2 with the Space Telescope Imaging Spectrograph and Near-Infrared Camera and Multiobject Spectrometer. The observations reveal a pointlike source with R = 23.1±0.2 and H = 20.6±0.3, in agreement with the power-law temporal decay seen in ground-based monitoring. Unlike the case of GRB 970228, no nebulosity is detected… 

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