FERMI GBM OBSERVATIONS OF LIGO GRAVITATIONAL-WAVE EVENT GW150914
FERMI GBM OBSERVATIONS OF LIGO GRAVITATIONAL-WAVE EVENT GW150914
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DOI：
10.3847/2041-8205/826/1/l6
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
V. Connaughton;E. Burns;A. Goldstein;L. Blackburn;L. Blackburn;M. Briggs;Bin-Bin Zhang-Bin;Bin-Bin Zhang-Bi
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文献类型：
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作者：
V. Connaughton;E. Burns;A. Goldstein;L. Blackburn;L. Blackburn;M. Briggs;Bin-Bin Zhang-Bin;Bin-Bin Zhang-Bi
费米伽马射线暴监测器（GBM）拥有70%的天空瞬时视图，是寻找引力波（GW）事件电磁对应物的绝佳合作伙伴。激光干涉仪引力波天文台（LIGO）事件GW 150914时的GBM观测揭示了GW事件后0.4 s存在50 keV以上的弱瞬态，虚警概率为0.0022（2.9σ）。这种持续1秒的微弱瞬变没有被任何其他仪器探测到，似乎与其他先前已知的天体物理学、太阳、地球或磁层活动无关。它的定位是病态约束，但与GW 150914的方向一致。瞬态事件的持续时间和光谱与弱短伽马射线暴（GRB）以大角度到达费米所指的方向一致，GBM探测器的响应不是最佳的。如果GBM瞬变与GW 150914有关，那么来自恒星质量黑洞双星合并的电磁信号是意想不到的。我们计算了在1 keV和10 MeV之间硬X射线发射的光度为1.8 − 1.0 + 1.5 × 10 49 erg s−1。未来LIGO/Virgo和Fermi GBM对GW事件的联合观测可以揭示这里报告的弱瞬态是否是GW 150914的合理对应物或偶然巧合，并将进一步探索紧凑的二元合并和短GRB之间的联系。
With an instantaneous view of 70% of the sky, the Fermi Gamma-ray Burst Monitor (GBM) is an excellent partner in the search for electromagnetic counterparts to gravitational-wave (GW) events. GBM observations at the time of the Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914 reveal the presence of a weak transient above 50 keV, 0.4 s after the GW event, with a false-alarm probability of 0.0022 (2.9σ). This weak transient lasting 1 s was not detected by any other instrument and does not appear to be connected with other previously known astrophysical, solar, terrestrial, or magnetospheric activity. Its localization is ill-constrained but consistent with the direction of GW150914. The duration and spectrum of the transient event are consistent with a weak short gamma-ray burst (GRB) arriving at a large angle to the direction in which Fermi was pointing where the GBM detector response is not optimal. If the GBM transient is associated with GW150914, then this electromagnetic signal from a stellar mass black hole binary merger is unexpected. We calculate a luminosity in hard X-ray emission between 1 keV and 10 MeV of 1.8 − 1.0 + 1.5 × 10 49 erg s−1. Future joint observations of GW events by LIGO/Virgo and Fermi GBM could reveal whether the weak transient reported here is a plausible counterpart to GW150914 or a chance coincidence, and will further probe the connection between compact binary mergers and short GRBs.