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伽玛暴光学余辉光度函数 和 60 cm 光学望远镜

伽玛暴光学余辉光度函数 和 60 cm 光学望远镜. 王祥高 广西大学 — 国家天文台天体物理与空间科学研究中心 China-VO and Astroinformatics 2012·2012.11.28-12.02· 三峡大学. Outline. 1. GRB and it’s optical emission 2. Observed GRB Optical Brightness Distribution Function 3. MC simulation 4. Robotic 60-cm Telescopes of GXU-NAOC Center

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伽玛暴光学余辉光度函数 和 60 cm 光学望远镜

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  1. 伽玛暴光学余辉光度函数和60 cm 光学望远镜 王祥高 广西大学—国家天文台天体物理与空间科学研究中心 China-VO and Astroinformatics 2012·2012.11.28-12.02·三峡大学

  2. Outline 1. GRB and it’s optical emission 2. Observed GRB Optical Brightness Distribution Function 3. MC simulation 4. Robotic 60-cm Telescopes of GXU-NAOC Center 5. Summary and Discussion

  3. 1.伽玛暴 伽玛射线暴(Gamma-Ray Burst，GRB)是宇宙学距离上的宇宙大爆炸以来的最强的能量爆发事件，它的主要特点是伽玛射线波段流量突然增强，以及具有的瞬时性，能量高，时标短，光变曲线复杂多变等特点。

  4. 星系 物理 恒星 物理 伽玛暴 高能辐射过程 宇宙学 科学意义 引力物理 中心能源？ 喷流形成和演化？ 火球动能辐射？ 各种成份的物理起源？ …….

  5. Shallow Decay Oneset 伽玛暴光变曲线 Distinct origins of various components ? luminosity functions (LF) at t<1h ? Li, Liang et al. 2012, arXiv1203.2332

  6. Outline 1. GRB and it’s optical emission 2.Observed GRB Optical Brightness Distribution Function 3. MC simulation 4. Robotic 60-cm Telescopes of GXU-NAOC Center 5. Summary and Discussion

  7. Data selection • Sample: • Full sample of GRBs with optical afterglow detection from 1997-2012, 230 GRBs included • 146 well-sampled LCs for our analysis. Most of them were observed in the R-band. • Optical data, prompt gamma-ray dataand redshift. • Corrections: • k-correction, • Galactic extinction (No correction for host galaxy extinction )

  8. 光度分布 Global lightcurves

  9. 光度分布 Onset

  10. 光度分布 shallow Decay

  11. 光度分布

  12. Optical prompt emission of GRBs • 目前已探测到伽玛暴～4000个； • 但探测到爆发时光学辐射的<10个: • GRB 990123, 041219, 050401, 050820A, 060111B, 061121, 080913B • 其中仅仅 GRB 080913B有无时延观测！ GRB 080913B

  13. Summary for the observations: • The observed distributions of R-band magnitude are roughly a Gaussian function. About 90% of GRBs in the above samples have R<20. This may be due to instrumental selection effect (only small robotic telescope can rapidly response to the GRB triggers). • Prompt Optical Flares: More luminous, and the burst time is more early

  14. Outline 1. A generic Optical Lightcurves of GRBs 2. Observed GRB Optical Brightness Distribution Function 3. MC simulation 4. Robotic 60-cm Telescopes of GXU-NAOC Center 5. Summary and Discussion

  15. Free parameters in our models: MC simulation Model (3)Extinction: (1)Optical luminosity function: (2)GRB rate:

  16. MC Result {α1=0.70, α2=1.9} Lb~ 1046 erg s-1 • Our Monte Carlo (MC) simulations suggest that a intrinsic broken power-law luminosity function can well reproduced the observed magnitude distributions.

  17. Outline 1. GRB and it’s optical emission 2. Observed GRB Optical Brightness Distribution Function 3. MC simulation 4. Robotic 60-cm Telescopes of GXU-NAOC Center (Robotic Autonomous Observatory) 5. Summary and Discussion

  18. GRM VT GWAC GFTs MXT CXG SVOM Space Multi-band Variable Objects Monitor GWAC, an array of ground wide angle cameras 450-900nm 2sr (90*90 deg)

  19. GXU-NAOC Robotic Telescopes • Diameter: 60cm • FoV: 10arcmin • Colors: g,r,i (z) • CCDs: 1k1k EMCCD • 600mm (24") Ritchey-Chrétien System • f/3 primary mirror with f8 System focal ratio • LOMO Ritchey Chrétien optical set • Mirror material zero to low expansion Astro-Sital ceramics • L/8 PtV wave, >95% Strehl • Direct Drive Mount • speed 15°/sec. ( 25°/sec. optional) • Pointing ：<3“ RMS with pointingfile • Tracking precision： <0.15“ RMS in 5 minutes • Encoder resolution： 0.007“ on the axis

  20. EMCCD • 增益可显著地改善这种极微弱信号的信噪比，由此在大吞吐量的分析研究中可实现更快的采样和更短的曝光时间。 • 快速读出, 半导体制冷型（ -90 ℃ ）.

  21. Science goal of GXU-NAOC Robotic Telescopes • Fast time resolution light curves • Prompt emissions • Early afterglow • Confirming GWAC On: • Sub-arcsecond localization • Multi-color diagram

  22. Swift SVOM 观测策略 伽玛暴坐标网络(GCN) GWAC 60 cm Robotic telescope 大型望远镜

  23. 中心集群机硬件配置与软件环境 ►管理及IO节点：1个， 2颗8核CPU ►计算节点：5个，每个节点有2颗8核CPU, 计算核心总数80核，每个计算 节点的内存容量：32G，共160G ►速度：双精度浮点运算峰值每秒0.64万亿次 ►容量：磁盘阵列存储空间裸容量32T。 ►系统峰值功耗：约为5kW

  24. 广西大学多功能计算平台网络拓扑图

  25. 广西大学多功能计算平台 采用混合式的集群（Cluster）架构，计算节点80个（1036核）包括： 刀片式计算节点：69个，每节点2颗六核处器； GPU节点： 10个，每节点2颗八核处器 胖节点： 1个，每节点8颗六核处器 速度： 双精度浮点运算理论峰值每秒15万亿次 节点总内存容量：2.56TB 分配磁盘总容量： 135TB

  26. Thanks

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