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GRB 010921: LOCALIZATION AND OBSERVATIONS BY THE HIGH ENERGY TRANSIENT EXPLORER SATELLITE

机译:GRB 010921:高能瞬态探测卫星的定位和观测

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On 2001 September 21 at 05:15:50.56 UT, the French Gamma Telescope (FREGATE) on the High Energy Transient Explorer (HETE) detected a bright gamma-ray burst (GRB). The burst was also seen by the X-detector on the Wide-field X-ray Monitor (WXM) instrument and was therefore well localized in the X-direction; however, the burst was outside the fully coded field of view of the WXM Y-detector, and therefore information on- the Y-direction of the burst was limited. Cross-correlation of the HETE and Ulysses time histories yielded an Interplanetary Network (IPN) annulus that crosses the HETE error strip at an ~45° angle. The intersection of the HETE error strip and the IPN annulus produces a diamond-shaped error region for the Ideation of the burst having an area of 310 arcmin~2. Based on the FREGATE and WXM light curves, the duration of the burst is characterized by t_(90) = 34.2 s in the WXM 4-25 keV energy range, and 23.8 and 21.8 s in the FREGATE 6-40 and 32-400 keV energy ranges, respectively. The fluence of the burst in these same energy ranges is 4.8 x 10~(-6), 5.5 x 10~(-6), and 11.4 x 10~(-6) ergs cm~(-2), respectively. Subsequent optical and radio observations by ground-based observers have identified the afterglow of GRB 010921 and determined an apparent redshift of z = 0.450.
机译:2001年9月21日,美国东部时间05:15:50.56,高能瞬变探测器(HETE)上的法国伽玛望远镜(FREGATE)检测到明亮的伽玛射线暴(GRB)。广角X射线监视器(WXM)仪器上的X探测器也可以看到该脉冲,因此可以很好地定位在X方向上。但是,该脉冲串不在WXM Y检测器的完全编码视野范围内,因此该脉冲串Y方向的信息受到限制。 HETE和尤利西斯(Ulysses)时间历史的互相关产生了一个行星际网络(IPN)环带,该环带以大约45°的角度穿过HETE误差带。 HETE误差带和IPN环的交点产生了一个菱形的误差区域,用于突发概念,其面积为310 arcmin〜2。根据FREGATE和WXM光曲线,爆发的持续时间的特征在于WXM 4-25 keV能量范围内的t_(90)= 34.2 s,以及FREGATE 6-40和32-400 keV的23.8和21.8 s能量范围。在相同的能量范围内,爆发的能量密度分别为4.8 x 10〜(-6),5.5 x 10〜(-6)和11.4 x 10〜(-6)ergs cm〜(-2)。地面观察员随后的光学和无线电观察发现了GRB 010921的余辉,并确定了z = 0.450的表观红移。

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