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GCN Circular 34985

GRB231111A: YAHPT Observations
2023-11-11T18:04:47Z (8 months ago)
Tianrui Sun at Purple Mountain Obs,CAS <>
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Tian-Rui Sun, Jin-Jun Geng, Jian Chen and Lei Hu report on behalf of the YAHPT team:

Following the detection of GRB 231111A by SWIFT (Melandri et al., GCN 34981), MASTER (Lipunov et al., GCN 34980, GCN 34983) and Nanshan/HMT (Jiang et al. GCN 34982), we conducted observations using the Yaoan High Precision Telescope at Yaoan Astronomy Observation Station (YAHPT; Yunnan province, China) to search and follow up its afterglow around the SWIFT/UVOT detection.

Our follow-up imaging obervations adopted 180s exposure in Rc-band starting from 11 Nov 2023, UTC 14:47:12.70, about 1792.99 seconds after the burst. 
The YAHPT observations detected a declining optical afterglow from 18.34 +/- 0.07 mag to 18.98 +/- 0.12 mag in Rc band throughout our observations. 
We monitored this object until it is technically unobservable for our telescope, at about 4755 second after the burst.

We used the USNO B1.0 catalog (R1mag) as the magnitude reference for calibration.

[Editor's Note: The subject was modified at the user's request to list the correct GRB name.]
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