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arXiv 0801.4462astro-ph
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伽玛暴的Swift-XRT位置改进

Improving Swift-XRT positions of GRBs

P. A. Evans, A. P. Beardmore, M. R. Goad, J. P. Osborne, D. N. Burrows, N. Gehrels

摘要:

由于伽玛射线暴衰减迅速,因此在早期公布准确、精确的位置非常重要。对于雨燕探测到的爆发,最好的即时可用位置通常是X射线望远镜(XRT)的位置。我们提出了两个过程,开发的斯威夫特团队在莱斯特,这是现在经常使用的,以提高精度和准确性的XRT的位置报告的斯威夫特团队。这两种方法都是完全自动化的,都使用了PSF拟合方法,该方法可以解释CCD上的坏柱。第一种方法在触发后10- 20分钟内产生90%误差半径<4.4”90%的位置。第二种方法使用UVOT场星和XRT和UVOT探测器之间的已知映射进行天体测量校正位置,产生增强的位置,90%的时间误差半径<2.8”90%,通常在触发后约2小时。

英文摘要:

Since GRBs fade rapidly, it is important to publish accurate, precise positions at early times. For Swift-detected bursts, the best promptly available position is most commonly the X-ray Telescope (XRT) position. We present two processes, developed by the Swift team at Leicester, which are now routinely used to improve the precision and accuracy of the XRT positions reported by the Swift team. Both methods, which are fully automated, make use of a PSF-fitting approach which accounts for the bad columns on the CCD. The first method yields positions with 90% error radii <4.4" 90% of the time, within 10--20 minutes of the trigger. The second method astrometrically corrects the position using UVOT field stars and the known mapping between the XRT and UVOT detectors, yielding enhanced positions with 90% error radii of <2.8" 90% of the time, usually ~2 hours after the trigger.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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