GCN Circular 33101
Subject
IceCube-221223A: BOOTES-4/MET Optical Observations
Date
2022-12-25T07:48:52Z (2 years ago)
From
Dingrong Xiong at Yunnan Observatories of CAS, China <xiongdingrong@ynao.ac.cn>
D. R. Xiong, J. M. Bai, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. R. Mao, X. H. Zhao, L. Xu, X. G. Yu, K. X. Lu, X. Ding, D. Q. Wang (Yunnan Observatories), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team:
On 22-12-23 at 07:43:00.52 UT (T0) IceCube detected a track-like event with a high probability of being of astrophysical origin (GCN 33094). The gamma-ray source 4FGL J2322.7+3436 is located within the preliminary 90% uncertainty radius of the event (GCN 33094, 33100).
We observed the gamma-ray source 4FGL J2322.7+3436 using BOOTES-4/MET 0.6m automatic optical telescope. During our observation period, this target is darker in optical SDSS-i band compared to result of SDSS DR16 (15.32 mag). From the 23rd to the 24th, the target has a small brightening. The magnitudes were calculated using four stars in the same frame and the SDSS DR16 catalogue as reference. The SDSS-i band magnitudes (without being corrected for Galactic extinction) are given as follows.
MJD-T0 (day) | UT(start) | Magnitude (error) | Exposure Time
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0.394 | 22-12-23T17:10:40.800 | 15.565 (0.07) | 180s
0.397 | 22-12-23T17:14:47.990 | 15.585 (0.07) | 180s
0.4 | 22-12-23T17:18:58.982 | 15.545 (0.07) | 180s
0.403 | 22-12-23T17:23:11.962 | 15.565 (0.08) | 180s
0.406 | 22-12-23T17:27:18.979 | 15.455 (0.08) | 180s
1.263 | 22-12-24T14:01:26.026 | 15.401 (0.04) | 180s
1.267 | 22-12-24T14:06:55.037 | 15.427 (0.04) | 180s
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There was no optical source within best-fit position of IceCube-221223A. The upper limit of magnitude (without being corrected for Galactic extinction) is 20.18 +/- 0.06 (clear filter, exposure of 30*60s, 22-12-23T11:19:55.746 UT).
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The Burst Optical Observer and Transient Exploring System (BOOTES) is a world-wide automatic telescope network which aims to repaid follow-up of transient and astrophysical sources in the sky for which the first station was installed in 1998 (Hu et al. 2021). The fourth station of the BOOTE Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020). We acknowledge the support of these staffs from the BOOTES telescope networks.