{
  "bibcode": "2022GCN.31529....1X",
  "body": "D. R. Xiong, J. Mao, Y. Xin���D. H. Yan, J.-M. Bai (YNAO), and Y. L. Chang, W. Li, D. L. Xu (TDLI) report: \n\n\n\n\nWe follow the IceCube-211208A alert (GCN circ. 31191), and we observe the BL Lac object PKS0735+178,\n\nwhich might be the source candidate of IceCube-211208A. We have performed the optical monitor in each\n\nnight since 11, Dec. 2021. The 2.4-meter telescope and the BOOTES-4 telescope located at Gao-Mei-Gu (GMG)\n\nstation of Yunnan Observatories are utilized for the multi-band photometry. We have obtained the very\n\npreliminary results. As an example, the magnitude of r=14.69 was measured from the observation\n\nin 11, Dec. 2021, and the the magnitude of r=15.60 was measured from the observation in 14, Jan. 2022.\n\nWe note that the magnitude of r=15.50 is provided for this source by the Sloan Digital Sky Survey.\n\nThe multi-band photometric monitor is ongoing. We are working on the careful data reduction.\n\nThe long-term multi-wavelength observation for this target is encouraged.\n\n\n\n\nWe acknowledge the support of the staff from the Lijiang GMG 2.4-m telescope and the BOOTES\n\ntelescopes (A. J. Castro-Tirado and E. Fernandez- Garcia et al.).",
  "circularId": 31529,
  "createdOn": 1643437456000,
  "email": "jirongmao_obs@ynao.ac.cn",
  "subject": "IceCube-211208A: the optical observation of the candidate PKS0735+178",
  "submitter": "Jirong Mao at Yunnan Obs  <jirongmao_obs@ynao.ac.cn>",
  "eventId": "IceCube-211208A"
}