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首页> 外文期刊>The Astrophysical journal >GRB 050911: A BLACK HOLE-NEUTRON STAR MERGER OR A NAKED GRB
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GRB 050911: A BLACK HOLE-NEUTRON STAR MERGER OR A NAKED GRB

机译：GRB 050911：黑色孔中子星合并或裸GRB

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摘要

GRB 050911, discovered by the Swift Burst Alert Telescope, was not seen 4.6 hr later by the Swift X-ray Telescope, making it one of the very few X-ray nondetections of a gamma-ray burst (GRB) afterglow at early times. The γ-ray light curve shows at least three peaks, the first two of which (～T_0 - 0.8 and T_0 + 0.2 s, where T_0 is the trigger time) were short, each lasting 0.5 s. This was followed by later emission 10-20 s postburst. The upper limit on the unabsorbed X-ray flux was 1.7 x 10~(-14) ergs cm~(-2) s~(-1) (integrating 46 ks of data taken between September 11 and 18), indicating that the decay must have been rapid. All but one of the long bursts detected by Swift were above this limit at ～4.6 hr, whereas the afterglows of short bursts became undetectable more rapidly. Deep observations with Gemini also revealed no optical afterglow 12 hr after the burst, down to r = 24.0 (5 σ limit). We speculate that GRB 050911 may have been formed through a compact object (black hole-neutron star) merger, with the later outbursts due to a longer disk lifetime linked to a large mass ratio between the merging objects. Alternatively, the burst may have occurred in a low-density environment, leading to a weak, or nonexistent, forward shock—the so-called "naked GRB" model.
机译：由Swift Burst Alert Telescope发现的GRB 050911，在4.6小时后才被Swift X射线望远镜发现，这使其成为早期很少出现的伽马射线暴（GRB）余辉X射线未探测到的现象之一。 γ射线曲线显示至少三个峰值，其中前两个峰值（〜T_0-0.8和T_0 + 0.2 s，其中T_0为触发时间）很短，每个持续0.5 s。随后是爆发后10-20 s的后期发射。未吸收X射线通量的上限为1.7 x 10〜（-14）ergs cm〜（-2）s〜（-1）（积分了9月11日至18日之间采集的46 ks数据），表明衰减一定是很快的。 Swift所检测到的长脉冲中只有一个在4.6小时以上都超过了该限制，而短脉冲的余辉变得更加难以检测。用双子座进行的深层观察还发现，爆裂后12小时没有光学余辉，降至r = 24.0（5σ极限）。我们推测GRB 050911可能是由紧凑的物体（黑洞-中子星）合并形成的，后来爆发是由于更长的磁盘寿命与合并对象之间的质量比有关。或者，爆发可能发生在低密度环境中，从而导致微弱或不存在的前向冲击-所谓的“裸GRB”模型。

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