TITLE:   GCN CIRCULAR
NUMBER:  45324
SUBJECT: EP260809a: OHP/T193 optical observations
DATE:    26/08/09 03:43:07 GMT
FROM:    Christophe Adami at LAM <christophe.adami@lam.fr>

C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), B. Schneider (LAM), A. Saccardi (CEA/Irfu), S. Basa (LAM/OHP/Pytheas/AMU) report on behalf of a larger collaboration:

We observed the field of EP260809a (Sun et al., GCN45321) using the T193cm telescope at Observatoire de Haute-Provence (France) with the MISTRAL spectro-imager. We obtained 4x10 minutes of exposure in the r-band under a 2.3arcsec seeing, starting at 20260809_020201UT (1.4 hr after the Sun et al. trigger) and ending at 20260809_025709UT (2.3 hr after the Sun et al. trigger).

In the preliminary stacked images, we detect an object not present in PanStarr images at 

RA (J2000): 21:54:19.2 
DEC (J2000): +17:36:23 

with a preliminar magnitude of: 

r = 21.53 +/- 0.10 mag

The photometric calibration was performed using nearby stars from the PanSTARRS catalog and the STDWeb/STDPipe tools (Karpov 2025), is in the AB system, and is not corrected for Galactic extinction.

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