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GCN Circular 36862

Subject
GRB 240713A: JinShan optical upper limits
Date
2024-07-14T14:29:52Z (5 months ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Via
Web form
S.Q. Jiang, S.Y. Fu, Z.P. Zhu, X. Liu, J. An, L.B. He, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration:

We observed the field of GRB 240713A detected by SVOM/ECLAIRs (Schanne et al., GCN 36854Not found
 
 
) and by Fermi/GBM as a sub-threshold event (Burns et al., GCN 36856Not found
 
 
) using the 50D, 100C telescopes of the JinShan project located at Altay, Xinjiang, China.

A series of Sloan r-, i-, and z- bands frames were obtained fro m 17:33:20 UT to 20:22:38.95 on 2024-07-13, i.e., starting 15.51 hr after the SVOM trigger time.

We didn't detect any credible new source at the positions of the ten X-ray afterglow candidates found by EP/FXT (Yang et al., GCN 36860Not found
 
 
), down to the following 5-sigma upper limits:

Source | R.A. | Dec. | Sloan-r | Sloan-i | Sloan-z |
--------------------------------------------------------
EP J233058.2+015317  | 352.7425 | 1.8879 | 22.0 | 19.7 | 20.0
EP J233023.3+015537  | 352.5970 | 1.9269 | 20.6 | 19.7 | 20.2
EP J233039.0+014426  | 352.6627 | 1.7404 | 22.0 | 19.7 | 20.0
EP J233020.4+015231  | 352.5850 | 1.8753 | 22.0 | 19.7 | 20.2
EP J233016.5+020124  | 352.5687 | 2.0232 | 20.6 | 19.7 | 20.2
EP J233017.4+014339  | 352.5724 | 1.7275 | 22.0 | 19.7 | N/A
EP J233012.2+015001  | 352.5509 | 1.8335 | 20.6 | 19.7 | 20.0
EP J233042.1+015623  | 352.6754 | 1.9397 | 20.6 | 19.7 | 20.0
EP J233002.5+015949  | 352.5104 | 1.9968 | 20.6 | 19.7 | 20.2
EP J232954.2+015030  | 352.4757 | 1.8416 | 20.6 | 19.7 | N/A

calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction.

We acknowledge the excellent support from S.W Luo, M.M. Yang, Z. K. Feng, Q. C. Zhao and L.F. Huo for enabling these observations.