X-ray transient EP240315a: PRIME near infrared detection
Abstract
Following the Einstein Probe detection (GCN 35931) of EP240315a, we observed the transient field in the J filter with PRIME ~1 day after the Einstein Probe detection. At the position of the optical transient AT2024eju reported by ATLAS (Srivastav et al. GCN 35932), we detect an uncatalogued source in J band. Using nearby VISTA Hemispherical Survey (VHS) stars for preliminary calibration we derive the following magnitude, not corrected for Galactic extinction: Filter | Mag(VISTA) | SNR | Seeing | Total exposure time (s) | UT Date-time at start -------|----------------|-----|--------|------------------------------------------------ J | 19.7 +/- 0.3 | 6.0 | 1.3" | 675 | 2024-03-16T19:14:20 This result is consistent with GROND detection (Rau GCN 35937). Conditions were intermittently cloudy, resulting in higher than usual photometric error. PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa. Further observations are planned. We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations.
- Publication:
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GRB Coordinates Network
- Pub Date:
- March 2024
- Bibcode:
- 2024GCN.35956....1G