VLT observations of GRB 990510 and its environment

C. Kouveliotou; E. Palazzi; E. Pian; E. Rol; F. Frontera; F.V. Hessman; H. Nicklas; J. van Paradijs; K. Beuermann; K. Reinsch

VLT observations of GRB 990510 and its environment

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arxiv astro-ph/9909043 v1 pith:XEESOA5V submitted 1999-09-02 astro-ph

VLT observations of GRB 990510 and its environment

K. Beuermann , F.V. Hessman , K. Reinsch , H. Nicklas , P.M. Vreeswijk , T.J. Galama , E. Rol , J. van Paradijs

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C. Kouveliotou F. Frontera N. Masetti E. Palazzi E. Pian

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keywords galaxyafterglowcurvelightsigmatransientaloneantu

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We present BVRI photometry and spectrophotometry of GRB990510 obtained with the ESO VLT/Antu telescope during the late decline phase. Between days 8 and 29 after the burst, the afterglow faded from R=24.2 to ~26.4. The spectral flux distribution and the light curve support the interpretation of the afterglow as synchrotron emission from a jet. The light curve is consistent with the optical transient alone but an underlying SN with maximum brightness R>27.4 or a galaxy with R>27.6 (3-sigma upper limits) cannot be ruled out. To a 5-sigma detection threshold of R=26.1, no galaxy is found within 6'' of the transient. A very blue V~24.5 extended object which may qualify as a starburst galaxy is located 12'' SE, but at unknown redshift.

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Short GRB 090510: a magnetized neutron star binary merger leading to a black hole
astro-ph.HE 2025-09 conditional novelty 6.0

GRB 090510 is modeled as a merger of two ~1.2 solar mass neutron stars that forms a spinning 2.36 solar mass black hole, with each emission phase traced to a different energy source.