We have developed an optical wide-field polarimeter, HOWPoI, which employs a wedged double Wollaston prism and enables us to derive linear polarization (i.e., Stokes Q I 1 and U/I) from only a single exposure. We successfully performed observation for the afterglow of GRB 091208B. Its first exposure started — 150 seconds after the gamma-ray trigger. Our preliminary result suggests that the early afterglow was significantly polarized, larger than a few percent.
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机译：我们开发了一种光学宽野偏振仪HOWPOI，它采用楔形的双杆杆棱镜，使我们能够从单个曝光中导出线性极化（即，斯托克Q I 1和U / I）。我们成功地对GRB 091208B的余辉进行了观察。它的第一次曝光开始 - 伽马射线触发后150秒。我们的初步结果表明，早期的余辉显着偏振，大于百分比。
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