GCN Circular 44593
Subject
GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
Event
Date
2026-05-13T02:15:50Z (20 days ago)
From
lijj328@mail2.sysu.edu.cn
Via
Web form
Jin-Ji Li, Chun Chen, Duo-Le Cao, Zhong-Nan Dong, Wei-Sen Huang, Jia-Qi Lin, Pu Lin, Yun Shi, Hao-Nan Yang, Yan Yu, P H Thomas Tam, Rong-Feng Shen, Bin Ma (Sun Yat-sen University) report on behalf of the SYSU 80 cm infrared telescope team:
We further observed the field of GRB 260511B detected by SVOM/ECLAIRs (Godet et al., GCN 44543) and Fermi (Fermi GBM team, GCN 44542), using the Sun Yat-sen University (SYSU) 80 cm infrared telescope.
The afterglow (Wu et al., GCN 44547; Sasada et al., GCN 44549; Jiang et al., GCN 44551; Wu et al., GCN 44552; Li et al., GCN 44557; Vijaykumar et al., GCN 44561; Lee et al., GCN 44567; Li et al., GCN 44568; Wang et al., GCN 44571; Belkin et al., GCN 44572; Adami et al., GCN 44573; Saccardi et al., GCN 44574; Rajabov et al., GCN 44576; Pérez-Fournon et al., GCN 44577; Novotný et al., GCN 44580; Moskvitin, GCN 44582; Calapai, GCN 44592) with the redshift of z=2.006 (Postigo et al., GCN 44565) was clearly detected in our stacked J-band images. The photometric results are summarized in the table below. The photometry was calibrated against nearby stars from the 2MASS catalog and is reported in the Vega system, without correction for Galactic extinction.
Mid time |Band | Exposure | Mag (Vega)
------------|-------|-------------|------------------
5.362 h | J | 700s | 16.66 +/- 0.14
5.568 h | J | 640s | 16.57 +/- 0.10
5.771 h | J | 640s | 16.85 +/- 0.13
5.985 h | J | 560s | 17.16 +/- 0.18
6.191 h | J | 660s | 17.10 +/- 0.19
7.011 h | J | 960s | 17.11 +/- 0.15
7.367 h | J | 1040s | 17.26 +/- 0.14
7.720 h | J | 1100s | 17.46 +/- 0.18
The SYSU 80 cm infrared telescope is operated and managed by the Department of Astronomy, Sun Yat-sen University.