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GCN Circular 37373

Subject

GRB 240825A: Magnitude Correction in SVOM/C-GFT Optical Observations

Date

2024-09-02T13:29:52Z (6 months ago)

From

Chao Wu at NAOC <wuchao.lamost@gmail.com>

Via

Web form

SVOM/C-GFT team: Chao Wu (NAOC), Zhe Kang (CHO)，Liping Xin(NAOC),Xuhui Han(NAOC),Pinpin Zhang (NAOC)，Xiaomeng Lu (NAOC), Zhenwei Li (CHO)，You Lv (CHO)，Ruosong Zhang (NAOC)，Yujie Xiao(NAOC)

SVOM JSWG: Jian-Yan Wei (NAOC,  China), Bertrand Cordier (CEA, F), Shuang-Nan Zhang (IHEP, CN), Stephane  Basa (LAM, F), Jean-Luc Attéia (IRAP, F), Arnaud Claret (CEA, F),  Zi-Gao Dai (USTC, CN), Frederic Daigne (IAP, F), Jin-Song Deng (NAOC,  CN), Andrea Goldwurm (APC, F), Diego  Götz (CEA, F), Xu-Hui Han (NAOC, CN), Cyril Lachaud (APC, F), En-Wei Liang (GXU, CN), Yu-Lei Qiu (NAOC,  CN), Susanna Vergani (Obs.Paris, F), Jing Wang (NAOC, CN), Chao Wu(NAOC, CN), Li-Ping Xin (NAOC,CN), Bing Zhang (UNLV, CN)



After taking refined analysis on the Optical Observations (Wu et al. GCN 37292Loading...
 
 ), we fixed a bug in the flux calibration pipeline. We update the afterglow magnitude of GRB 240825A as following, 
-----------------------------------------------------------
 Filter    (t-T0) sec          mag  +/- mag_error 
  g       65  -> 2555     13.73 +/- 0.02 -> 18.58 +/- 0.28 
  r       206 -> 2088     15.11 +/- 0.02 -> 17.93 +/- 0.15 
  i       294 -> 2162     15.14 +/- 0.02 -> 17.68 +/- 0.15

The magnitudes were calibrated using nearby PS1 stars.  

We apologize for any confusion caused.