{
  "subject": "GECAM observation of a burst from SGR J1555.2-5402",
  "bibcode": "2021GCN.30787....1Z",
  "createdOn": 1631198952000,
  "circularId": 30787,
  "submitter": "Zhao Yi at POLAR  <yizhao@ihep.ac.cn>",
  "email": "yizhao@ihep.ac.cn",
  "body": "Yi Zhao, S. Xiao, S. L. Xiong, L. Lin, C. Cai, J. J. He, Y. Huang, Z. W. Guo, \nC. Y. Li, X. B. Li, J. C. Liu, X. Y. Song, C. W. Wang, P. Wang, S. L. Xie, W. C. Xue,\nQ. B. Yi, Y. Q. Zhang, G. Y. Zhao, X. Y. Zhao, C. Zheng, Y. Q. Du, D. Y. Guo, \nJ. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song, J. Wang, H. Wu, \nP. Zhang, S. N. Zhang, X. L. Zhang, Z. Zhang, S. J. Zheng (IHEP),\nreport on behalf of GECAM team:\n\nDuring the commissioning phase, GECAM-B was triggered on-ground by\na bright short burst from SGR J1555.2-5402 at 2021-09-07T19:15:21.100 UTC (T0),\nwhich was also detected by Fermi/GBM.\n\nAccording to the GECAM-B light curves in about 15-60 keV, this burst\nmainly consists of a single pulse with T90 of 18 ms measured from\nT0-0.014 s.\n\nThe GECAM light curve could be found here: \nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/SGR20210907T191521.100-Lc.png\n\nSince this burst has very few counts registered on GECAM-B detectors, the location\ngiven by GECAM-B alone is quite coarse but broadly consistent with SGR J1555.2-5402.\n\nAccording to our multiple-mission joint location pipeline (S. Xiao et al.,\naccepted by ApJ) using GECAM-B and Fermi/GBM data, this burst is localized to\nan annulus which is very consistent with SGR J1555.2-5402. \n\nThe GECAM-GBM joint location could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/SGR20210907T191521.100-JointLoc.png\n\nConsidering these results stated above and some activities reported recently,\nwe conclude that this burst is from SGR J1555.2-5402.\n\nPlease note that all GECAM results here are preliminary. The final analysis\nwill be published in journal papers or GECAM online catalog.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor\n(GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in\nLow Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time),\nwhich was funded by the Chinese Academy of Sciences (CAS)."
}