MG13 - Talk detail |
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Participant |
Toma, Kenji | |||||||
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Institution |
Department of Earth and Space Science, Osaka University - 5600043 - Toyonaka - Osaka - Japan | |||||||
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Session |
GRB2 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
Polarization of GRB Prompt Emission and Early Afterglows | |||||
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Abstract |
Very recently, we have reported the polarization measurement in prompt gamma-ray emission of GRB 100826A with the Gamma-Ray Burst Polarimeter (GAP) on board the small solar-power-sail demonstrator IKAROS (Yonetoku, Murakami, Gunji, Mihara, Toma, et al. 2011). This is the most reliable detection of prompt gamma-ray polarization so far. I would like to review the observational results of the GAP (including preliminary results on other bursts) with discussing some theoretical implications for the prompt emission mechanism. I will also review recent observational progress on optical polarimetry of early afterglows and their theoretical implications. |
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Session |
OC3 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Population III GRBs and their Afterglows | |||||
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Abstract |
Gamma-ray bursts produced by the collapses of Population III stars (i.e., first generation stars) could have total isotropic energies as high as 1e57 erg and observer's frame durations as long as 1 day, depending on the star mass. We calculate the afterglow spectra of such Pop. III GRBs based on the standard external shock model, and show that they can be detected by Swift satellite. Their radio afterglows can be very bright, which leads to a constraint on the Pop. III GRB rate from the current radio survey data, and could be interesting background source candidates for 21 cm absorption line detections. |
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