Detection of GRB 090618 with RT-2 Experiment Onboard the Coronas-Photon Satellite
A. R. Rao, J. P. Malkar, M. K. Hingar, V. K. Agrawal, S. K. Chakrabarti, A. Nandi, D. Debnath, T. B. Kotoch, R. Sarkar, T. R. Chidambaram, P. Vinod, S. Sreekuma… 展开作者
A. R. Rao, J. P. Malkar, M. K. Hingar, V. K. Agrawal, S. K. Chakrabarti, A. Nandi, D. Debnath, T. B. Kotoch, R. Sarkar, T. R. Chidambaram, P. Vinod, S. Sreekumar, Y. D. Kotov, A. S. Buslov, V. N. Yurov, V. G. Tyshkevich, A. I. Arkhangelskij, R. A. Zyatkov, Sachindra Naik
备注:
12 pages, 6 figures, 3 tables, Accepted for publication in The Astrophysical Journal
We present the results of an analysis of the prompt gamma-ray emission from GRB 090618 using the RT-2 Experiment onboard the Coronas-Photon satellite. GRB 090618 shows multiple peaks and a detailed study of the temporal structure as a function of energy is carried out. As the GRB was incident at an angle of 77 degree to the detector axis, we have generated appropriate response functions of the detectors to derive the spectrum of this GRB. We have augmented these results using the publicly available data from the Swift BAT detector and show that a combined spectral analysis can measure the spectral parameters quite accurately. We also attempt a spectral and timing analysis of individual peaks and find evidence for a systematic change in the pulse emission characteristics for the successive pulses. In particular, we find that the peak energy of the spectrum, E_p, is found to monotonically decrease with time, for the successive pulses of this GRB.
In-Orbit GRB Identification Using LLM-based model for the CXPD CubeSat
School of Physical Science, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);School of Astronomy and Space Sciences, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University(广西大学物理科学与技术学院相对论天体物理重点实验室);Zhejiang Lab(之江实验室);New Cornerstone Science Laboratory, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台新基石科学实验室)
Swift/UVOT: 18 Years of Long GRB Discoveries and Advances
Neil Gehrels Swift天文台(Swift)已经运行了18年。雨燕上的紫外线/光学望远镜(UVOT)被设计用来捕捉伽马射线暴(GRB)最早的光学/紫外线辐射,时间跨度从伽玛射线爆发后的最初几分钟到几天。在这篇文章中,我提供了一个由Swift/UVOT观测到的长伽玛暴(其瞬发伽玛射线持续时间>2秒)的概述,并回顾了Swift/UVOT在过去18年中所取得的重大发现。我讨论了我们的知识和理解的光学/UV发射,特别是早期的光学/UV余辉的改进。
GRB 110709A, 111117A and 120107A: Faint high-energy gamma-ray photon emission from Fermi/LAT observations and demographic implications
2008年6月11日发射的$Fermi$伽马射线太空望远镜上的LAT仪器为研究伽马射线暴的高能光子发射提供了一个难得的机会。尽管费米LAT协作组已确定了大多数此类事件(27),但使用更灵敏的统计技术发现了4个事件(Akerlof et al 2010,Akerlof et al 2011,Zheng et al 2 012)。在本文中,我们继续我们的前期工作,发现了另外三个与高能光子发射有关的伽玛暴,伽玛暴110709 A,111117 A和120107 A。为了系统化我们的匹配滤波器方法,已经开发了一个流水线来近实时地识别这些对象。GRB 120107 A是该分析程序的第一个产品。尽管识别阈值降低,但伽玛射线暴事件的数量并未显著增加。这种相对缺乏的事件与低光子数促使研究的表观光子数分布。我们发现一个非常好的适合一个简单的幂律指数为-1.8 $\pm $ 0.3的微分分布。正如所预期的,在GBM探测到的较低能量光子的数量与LAT观测到的数量之间存在实质相关性。因此,高能光子发射与一些但不是所有较亮的GBM事件相关联。对少数高能爆发的性质进行更深入的研究,最终可能会使我们对整个现象有更好的理解。
SVOM/VT: Overview of data processing and GRB identifications with X-band data
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿交叉科学研究院);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理学院)