TITLE:   GCN CIRCULAR
NUMBER:  38041
SUBJECT: GRB241030A: OHP/T193 optical observations
DATE:    24/11/02 11:55:37 GMT
FROM:    Christophe Adami at LAM <christophe.adami@lam.fr>

C. Adami (LAM), B. Schneider (MIT)， report on behalf of a larger collaboration:

We observed the field of GRB241030A (at a redshift of z=1.41) (Fermi GBM Team, GCN 37955, 
Klingler et al., GCN 37956; Beardmore et al., GCN 37962; Wang et al., GCN 37972; Pillera et al., 
GCN 37979; Ridnaia et al., GCN 37982; Ambrosi et al., GCN 37988; Wu et al., GCN 37997; Liang et 
al., GCN 38026; Watson et al., GCN 37957; Fernández-Rodríguez et al., GCN 37958; Zheng et al., 
GCN 37959; An et al., GCN 37960; Higuchi et al., GCN 37963; Qiu et al.,GCN 37965; Lin et al., 
GCN 37966; Wu et al., GCN 37970; Breeveld & Klingler, GCN 37974; Méndez-Lapido et al., GCN 37993;
Moskvitin & Goranskij, GCN 38016; Busmann et al., GCN 38019; Schneider et al., GCN 38021; Li et 
al., GCN 38027; Masi, GCN 38031; Moskvitin et al., GCN 38032, Yan et al., GCN 38035, Liang et 
al., GCN38040) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped 
with the MISTRAL spectro-imager. A total of 70 min of exposure (7x600s) were obtained in the 
r-band starting at 03:46:29 UT on 2024-11-02 (~2.9 days after the trigger).

The optical counterpart is clearly detected on the stacked images, with the following 
preliminar magnitude: r = 21.9 +/- 0.1 mag (AB)

The photometric calibration was performed using nearby stars from the PanSTARRS catalog and 
the magnitude is not corrected for Galactic extinction.

We acknowledge the excellent support from Observatoire de Haute-Provence and in particular 
Stephane Favard for the MISTRAL observations.