Early Optical Afterglow Spectra of GRB021004 by Kiso Observatory

Details Early Optical Afterglow Spectra of GRB021004 by Kiso Observatory Early Optical Afterglow Spectra of GRB021004 by Kiso Observatory

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2749u&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

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Scientific paper

We have operated TOO system for prompt GRB follow-up observations at Kiso observatory since 2001. The Kiso observatory is located in Nagano prefecture, Japan, and has 105 cm schmidt telescope and three instruments. We carried out 14 follow-up observations using this system. In the GRB021004, we could obtain the very early afterglow spectrum with low disp ersion slitless spectrograph using objective prism, well before a position of optical transient was reported. We carried out spectrophotometry, and obtained B-, V-, R-, and I-band light curve. The brightness re-increased at ˜2 hours after the burst. From our results, it is suggested that the light curve have two components. One of the interpretations it that one is a prompt optical emission, and the other is typical afterglow. Here we report the optical follow-up observations of GRB021004.

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