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arXiv 1001.0955astro-ph.HE
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用GBM掩星观测大于100 keV的软Gamma Ray源

Observations of Soft Gamma Ray Sources >100 keV Using Earth Occultation with GBM

Gary L. Case, Michael L. Cherry, James Rodi, Ascencion Camero-Arranz, Elef Belken, Colleen A. Wilson-Hodge, Peter Jenke, P. N. Bhat, Michael S. Briggs, Vandiver… 展开作者

Gary L. Case, Michael L. Cherry, James Rodi, Ascencion Camero-Arranz, Elef Belken, Colleen A. Wilson-Hodge, Peter Jenke, P. N. Bhat, Michael S. Briggs, Vandiver Chaplin, Valerie Connaughton, Rob Preece, Mark H. Finger

摘要:

费米星上的伽马射线暴监测器(GBM)上的NaI和BGO探测器目前正用于对硬X射线/低能伽玛射线天空的长期监测。利用康普顿伽马射线天文台的BATSE仪器先前演示的地球掩星技术,GBM用其NaI探测器在8 keV - 1 MeV波段和BGO高达40 MeV波段为已知源和瞬态爆发产生多波段光变曲线和光谱。每两个轨道获得整个天空的覆盖,灵敏度超过BATSE在能量低于~25千电子伏和高于~1.5兆电子伏。我们描述的技术,并提出初步的结果后的第一个17个月的观测能量在100千电子伏以上。探测到7个源:蟹状星云、天鹅座X-1、雨燕J1753.5-0127、1 E 1740-29、Cen A、GRS 1915+105和瞬变源XTE J1752-223。

英文摘要:

The NaI and BGO detectors on the Gamma ray Burst Monitor (GBM) on Fermi are now being used for long term monitoring of the hard X-ray/low energy gamma ray sky. Using the Earth occultation technique demonstrated previously by the BATSE instrument on the Compton Gamma Ray Observatory, GBM produces multiband light curves and spectra for known sources and transient outbursts in the 8 keV - 1 MeV band with its NaI detectors and up to 40 MeV with its BGO. Coverage of the entire sky is obtained every two orbits, with sensitivity exceeding that of BATSE at energies below ~25 keV and above ~1.5 MeV. We describe the technique and present preliminary results after the first ~17 months of observations at energies above 100 keV. Seven sources are detected: the Crab, Cyg X-1, Swift J1753.5-0127, 1E 1740-29, Cen A, GRS 1915+105, and the transient source XTE J1752-223.

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