{
  "bibcode": "2023GCN.33540....1L",
  "body": "T.H. Lu, S.Q. Jiang, S.Y. Fu, X. Liu (NAOC), Z.P. Zhu (NAOC, HUST), D. \nXu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 230328B detected by Swift (Gropp et al., \nGCN 33527) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, \nChina. We obtained 12x300 s frames in the Sloan r-band, starting at \n14:49:11 UT on 2023-03-29 (i.e., 23.9 hr after the BAT trigger).\n\nThe optical afterglow (e.g., Pankov et al., GCN 33528; Belkin et al., \nGCN 33530; Lu et al., GCN 33534; Catapano et al., GCN 33535; Suresh et \nal., GCN 33536; Adami et al., GCN 33537; Gompertz et al., GCN 33538; \nKomesh et al., GCN 33539) is not detected in our stacked image. \nPreliminary photometric result is as follows:\n\nT_mid-T0 (hr)   Filter   Upper limit(3-sigma)\n    24.42             r           >21.0\n\ncalibrated with the nearby PanSTARRS field and not corrected for \nGalactic extinction.",
  "circularId": 33540,
  "createdOn": 1680141190000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 230328B: Nanshan/NEXT 2nd optical observation",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 230328B"
}