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浏览/检索结果: 共11条，第1-10条 帮助

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Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文  OAI收割
The Astrophysical Journal, 2020, 卷号: 901, 页码: L7
作者:  HXMT
  |  收藏  |  浏览/下载：25/0  |  提交时间：2022/02/08
Radio transient sources  Magnetars  Soft gamma-ray repeaters  2008  992  1471  Astrophysics - High Energy Astrophysical Phenomena  Astrophysics - Instrumentation and Methods for Astrophysics  Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of AJ = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 1014 Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to RNIR ? 0.025 (fluence index ?0.35).  
GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare? 期刊论文  OAI收割
The Astrophysical Journal, 2020, 卷号: 899, 页码: 106
作者:  HXMT
  |  收藏  |  浏览/下载：41/0  |  提交时间：2022/02/08
Gamma-ray bursts  Soft gamma-ray repeaters  Magnetars  Gamma-ray  transient sources  629  1441  992  1853  Astrophysics - High Energy  Astrophysical Phenomena  Abstract: The giant flares of soft gamma-ray repeaters (SGRs) have long been proposed to contribute to at least a subsample of the observed short gamma-ray bursts (GRBs). In this paper, we perform a comprehensive analysis of the high-energy data of the recent bright short GRB 200415A, which was located close to the Sculptor galaxy. Our results suggest that a magnetar giant flare provides the most natural explanation for most observational properties of GRB 200415A, including its location, temporal and spectral features, energy, statistical correlations, and high-energy emissions. On the other hand, the compact star merger GRB model is found to have difficulty reproducing such an event in a nearby distance. Future detections and follow-up observations of similar events are essential to firmly establish the connection between SGR giant flares and a subsample of nearby short GRBs.  
整合素-ICAM-1相互作用的二维反应动力学研究 会议论文  OAI收割
第九届全国生物力学学术会议, 中国天津, 2009-10-11
作者:  佟春芳;  高宇欣;  龙勉;  付长亮
收藏  |  浏览/下载：36/0  |  提交时间：2010/11/25
TL16C554在异步通信中的应用 期刊论文  OAI收割
光机电信息, 2003, 期号: 04, 页码: 29-33
孙建松; 翟多佳; 苏宛新
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/11
电脉冲下超硬铝合金中形成纳米铝的TEM观察与EDS分析 期刊论文  OAI收割
电子显微学报, 2002, 期号: 5, 页码: 667-668
张伟,隋曼龄,周亦胄,李斗星
收藏  |  浏览/下载：29/0  |  提交时间：2012/04/12
光子线微腔激光器 期刊论文  OAI收割
光机电信息, 2001, 期号: 12, 页码: 21-23
作者:  王立军;  秦莉
收藏  |  浏览/下载：24/0  |  提交时间：2013/03/11
胶州湾建港的地质环境 期刊论文  OAI收割
海洋科学, 1999, 期号: 5, 页码: 27-30
李平; 李常珍; 李乃胜
收藏  |  浏览/下载：20/0  |  提交时间：2013/10/08
铁对浮游植物生长影响的研究进展 期刊论文  OAI收割
海洋科学, 1999, 期号: 3, 页码: 48-49
杨东方; 谭雪静
收藏  |  浏览/下载：26/0  |  提交时间：2013/10/08
海洋生物基因库的研究与利用 期刊论文  OAI收割
海洋科学, 1995, 期号: 2, 页码: 24-26
张国范; 张福绥
收藏  |  浏览/下载：27/0  |  提交时间：2013/10/08
轻稀有气体同位素地球化学 期刊论文  OAI收割
地质地球化学, 1989, 期号: 04, 页码: 57-59+56
杜建国
收藏  |  浏览/下载：25/0  |  提交时间：2012/11/20