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GCN Circular 35012

GRB 231111A: Xinglong-2.16m optical observations
2023-11-13T15:33:47Z (8 months ago)
Dong Xu at NAOC/CAS <>
S.Q. Jiang, Z.P. Zhu, S.Y. Fu, J. An, X. Liu, T.H. Lu, D. Xu (NAOC) report:

We observed the optical afterglow of GRB 231111A detected by Swift (Melandri et al., GCN 34981) using the 2.16m telescope
located at Xinglong, Hebei, China, equipped with the BFOSC camera. Observations started at 14:34:11 UT on 2023-11-11 (i.e., 16.87 min after the Swift/BAT trigger), and 3x200, 9x300 s frames were obtained in the R-band.

Preliminary photometric results of the optical afterglow (e.g., Melandri et al. GCN 34981; Jiang et al. GCN 34982; Lipunov et al. GCN 34983; Kumar et al. GCN 34984; Sun et al. GCN 34985; Pankov et al. GCN 34994; Ruocco et al. GCN 34997; Li et al. GCN 35001; Sun et al. GCN 35002; Moretti et al. GCN 35003; Komesh et al. GCN 35004) are as follows:

Tmid-T0 (day)  Filter     Magnitude (5-sigma)
   0.0153           R         17.89 +/- 0.01
   0.8523           R          >21.6

calibrated with the nearby Pan-STARRS field.

We thank the great support of the Xinglong-2.16m staff.

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