Optical Follow-up of the GRB 010222 Afterglow by Subaru Telescope

Details Optical Follow-up of the GRB 010222 Afterglow by Subaru Telescope Optical Follow-up of the GRB 010222 Afterglow by Subaru Telescope

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53l..27w&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 4, pp. L27-L31

Astronomy and Astrophysics

Astrophysics

4

Cosmology: Early Universe, Gamma Rays: Bursts, Gamma Rays: Individual (Grb 010222), Gamma Rays: Observations, High Energy Astrophysics: General

Scientific paper

The optical afterglow of a gamma ray burst, GRB 010222, which was discovered by the BeppoSAX Team as the brightest one ever detected, was observed by Suprime-Cam of the Subaru Telescope at Mauna Kea. The obtained R-band magnitude was 18.59 +/- 0.04 at February 22.51 UT, 18.99 +/- 0.04 at February 22.65 UT, and 21.76 +/- 0.03 at February 25.64 UT. The light curve made from all data reported so far shows the decay of the brightness with a broken power law, of which the indices are -0.92 +/- 0.01 before and -1.27 +/- 0.01 after the break. The break point of the light curve is 0.73 +/- 0.02d after the burst, which is the earliest example ever observed. A brief summary of our follow-up observations, together with the importance of the optical follow-up capable by the Subaru telescope, is described in this letter.

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