Coordinated optical-EXOSAT-tenma observations of a burst from 2S1636-536 |
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| Authors: | M J L Turner L M Breedon T Ohashi T Courvoisier H Inoue M Matsuoka H Pedersen J van Paradijs W H G Lewin |
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| Institution: | (1) X-ray Astronomy Group, University of Leicester, University Road, LE1 7RH Leicester, UK;(2) STECF, Karl Schwarzschildstr. 2., D8046 Garching bei Munchen, W. Germany;(3) Institute of Space and Astronautical Science, 6-1 Komaba 4-chome, Meguro-Ku, 153 Tokyo, Japan;(4) European Southern Observatory, Casilla, 16317 Santiago, Chile;(5) Astronomical Institute, University of Amsterdam, Roeterstraat 15, Amsterdam, The Netherlands;(6) Department of Physics, Center for Space Research MIT, 02139 Cambridge, Ma, USA |
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| Abstract: | During a coordinated observations of 2S1636-536 with EXOSAT, Tenma and the 1.4 metre Danish telescope at La Silla, a single burst was detected at all three observatories. The burst was bright with a peak flux of 6 × 10-8
ergs/cm
2
/s and rapid expansion of the blackbody radius. EXOSAT and Tenma agree closely in the values of blackbody radius, temperature and flux which are very similar to the three bursts recently reported by Tenma which appear to reach the Eddington flux limit at their peak. Preliminary analysis of the X-ray and optical timing data reveal that this burst is unusual in having a sharp leading edge in both X-ray and optical data and a very short X-ray-optical delay compared with those previously observed. If confirmed, this result puts significant restraints on the location of the optical reprocessing site. |
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