GCN Circular 38071
Subject
EP241021a: OHP/T193 further optical observations
Event
Date
2024-11-04T12:48:00Z (a year ago)
From
Benjamin Schneider at MIT <bschn@mit.edu>
Via
Web form
Benjamin Schneider (MIT), Christophe Adami (LAM/Pytheas/AMU) report on behalf of a larger collaboration:
We re-observed the field of EP241021a (Hu et al., GCN 37834) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. A total of 120 min of exposure (12x600s) were obtained in the r-band starting at 20:29 UT on 2024-11-03 (13.7 days post-trigger). The optical transient is still clearly detected in our stacked image (Fu et al., GCNs 37840, 37842; Li et al., GCNs 37844, 37846; Ror et al., GCN 37845; Zheng et al., GCN 37849; Moskvitin & Spiridonova, GCN 37850; Pugliese et al., GCN 37852; Pérez-Fournon et al., GCN 37858; Bochenek & Perley, GCN 37869; Kumar et al., GCN 37875; Busmann et al., GCN 37877; J-Jin et al., GCN 37892; Freeburn et al., GCNs 37911, 37942, Quirola-Vasquez et al., GCN 37930; Freeburn et al., GCN 37942; Moskvitin et al., GCN 37951; Pan et al., GCN 37968; Klingler et al., GCN 37990; Carotenuto et al., GCN 38014; Schneider et al., GCN 38022; Bochenek et al., GCN 38030; Svinkin et al., GCN 38034; Aryan et al., GCN 38042; Freeburn et al., GCN 38062).
The preliminary magnitude derived for the source is
r = 22.53 +/- 0.12 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.