Materials for "GRB221009A: INTEGRAL detection of Hard X-ray emission at least 38 hours after trigger"

Images and data for "GRB221009A: INTEGRAL detection of Hard X-ray emission at least 38 hours after trigger". Text of the ATel #15663 and GCN #32691 below. <pre>Volodymyr Savchenko (UNIGE, EPFL), Carlo Ferrigno, Enrico Bozzo (UNIGE), D. Gotz (CEA Paris Saclay), S. Mereghetti (INAF/IASF Milano), Antonio Martin Carrillo, Lorraine Hanlon (UCD), Elisabeth Jourdain, Jean-Pierre Roques (IRAP), Thomas Siegert (University of Würzburg), Erik Kuulkers, Celia Sanchez (ESA) Following the detection of the record-breaking GRB221009A by Swift/BAT (GCN #32632,#32635), Fermi/GBM (GCN #32636), INTEGRAL/SPI-ACS (GCN #32660), we have performed INTEGRAL pointed observations of the GRB221009A location. INTEGRAL pointed observation lasted from 2022-10-10T14:31:40 (T0 + 25.2 hours, where T0 is 2022-10-09T13:17:00) to 2022-10-11T03:18:20 (T0 + 38.0 hours) with a total exposure time of 30.2 ks (for ISGRI). In the complete observation, the source is clearly detected in JEM-X1, JEM-X2 (3-30 keV), and ISGRI (28 - 80 keV), with S/N of 27.8, 27.3, 15.0 respectively. The joint JEM-X and ISGRI spectra can be satisfactorily modeled between 3 and 80 keV with a single powerlaw of slope 2.15 +/- -0.07 (90% confidence) with a flux of 4.4e-10 +/- -2.1e-11 erg/cm2/s (3 - 80 keV). This might indicate a single spectral component spanning from from hard X-ray to Fermi/LAT (GCN #32658). Combination of bright Hard X-ray afterglow with gamma-ray emission was also found in GRB120711A (Martin-Carrillo et al. 2014 A&amp;A 567, 84) and GRB130427A (Kouveliotou et al. 2013 ApJ 779L, 1K) - in fact GRB221009A appears rather similar to GRB120711A, but at 10 times smaller distance. Within the relatively short JEM-X not ISGRI lightcurves, we do not observe any evidence for flux decrease. Further INTEGRAL observations are scheduled between 2022-10-11 13:52:21 and 2022-10-13 00:58:26. These observations will overlap with the planned observation of IXPE (GCN #32690). We are grateful to the INTEGRAL Ground Segment team for quickly scheduling the observations. Images and reduced data related to this publication can be found here: https://zenodo.org/record/7186289 </pre>本数据集配套论文为《GRB221009A：触发后至少38小时硬X射线辐射的INTEGRAL探测》，以下为ATel #15663与GCN #32691的原文内容。弗拉基米尔·萨夫琴科（Volodymyr Savchenko，UNIGE、EPFL）、卡洛·费里尼奥（Carlo Ferrigno）、恩里科·博佐（Enrico Bozzo，UNIGE）、D.戈茨（D. Gotz，CEA Paris Saclay）、S.梅雷盖蒂（S. Mereghetti，INAF/IASF Milano）、安东尼奥·马丁·卡里略（Antonio Martin Carrillo）、洛林·汉隆（Lorraine Hanlon，UCD）、伊丽莎白·茹尔丹（Elisabeth Jourdain）、让-皮埃尔·罗克（Jean-Pierre Roques，IRAP）、托马斯·西格尔特（Thomas Siegert，维尔茨堡大学）、埃里克·库尔克尔斯（Erik Kuulkers）、西莉亚·桑切斯（Celia Sanchez，ESA）在Swift/BAT（GCN #32632、#32635）、Fermi/GBM（GCN #32636）以及INTEGRAL/SPI-ACS（GCN #32660）探测到创纪录的GRB221009A后，对该暴的天区位置开展了INTEGRAL定点观测。本次观测时段为2022年10月10日14时31分40秒（触发时刻T0为2022年10月9日13时17分00秒，对应T0+25.2小时）至2022年10月11日03时18分20秒（对应T0+38.0小时），ISGRI探测器的总曝光时长为30.2千秒（ks）。在完整观测数据中，源在JEM-X1、JEM-X2（3~30 keV）以及ISGRI（28~80 keV）能段均被清晰探测到，对应的信噪比（S/N）分别为27.8、27.3和15.0。JEM-X与ISGRI的联合能谱在3~80 keV能段可通过单幂律谱（powerlaw）得到良好拟合：谱指数为2.15±0.07（90%置信区间），3~80 keV能段的通量为(4.4±0.21)×10^-10 尔格/(平方厘米·秒)。这表明该源存在单一能谱成分，覆盖范围从硬X射线（Hard X-ray）直至Fermi/LAT（GCN #32658）所探测的能段。明亮硬X射线余辉与伽马射线辐射共存的现象也曾在GRB120711A（Martin-Carrillo等，2014，《A&A》567卷，84页）和GRB130427A（Kouveliotou等，2013，《ApJ》779L卷，1K页）中被观测到——事实上GRB221009A与GRB120711A的特征较为相似，但前者的距离仅为后者的1/10。在JEM-X而非ISGRI的短时光变曲线中，我们未观测到任何通量衰减的迹象。后续INTEGRAL观测计划于2022年10月11日13时52分21秒至2022年10月13日00时58分26秒期间开展，本次观测将与计划中的IXPE观测（GCN #32690）存在时段重叠。我们感谢INTEGRAL地面系统团队快速安排本次观测。本论文相关的图像与归约后数据可通过以下链接获取：https://zenodo.org/record/7186289