RIMOTSによるGRB030329可視光残光の観測

概要

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Bright gamma-ray burst GRB030329 was detected by HETE-2 at 1l:37:14.67(UT) on 29 March.2003. We got first image of its optical afterglow with RIMOTS at 164 minutes after the burst. Thetelescope of RIMOTS has 30cm aperture, and its field of view is 43' X43'. Our data shows itsmagnitude decreases from 13.0±0.2 to 14.2±0.1. This magnitude change can be described by apower-law function of time whose index is 1.0±0.1. These observations are consistent with otherobservations within the error. This power-law change of magnitude is explained by the model where ajet having nearly light speed expand and collide with interstellar gas decreasing its speed.Our non-filterd data shows that the fading of the afterglow becomes slower at 0.16 day after theburst. This change isn't seen in any data taken with R-band by other observatory. This phenomenonmay be due to the flux change of U, B, or V band. The spectroscopic observations are needed forfurther analysis of this phenomenon.
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