X-ray transient EP240315a: Montarrenti Observatory optical upper limit
Abstract
We observed the field of the possible optical countepart of the X-ray transient EP240315a (Einstein Probe, GCN 35931, Zhang et al.; GCN 35932, GCN 35933, Srivastav et al.; GCN 35935, Jiang et al.; GCN 35937, Rau; GCN 35938, Chen et al.) with the automated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88). The observations were started at 2024-03-16 20:10:21 UT (approximately 24 hours after the discovery of the X-ray transient) stacking 32x40s V and Rc-band CCD images. We have not found any optical transient candidate within the error-box of the EP mission position with the following upper limit: MJD Filter Limit SNR 60385.8572 V > 20.43 6.9 60385.8578 Rc > 20.90 5.4 Magnitude was calibrated with the nearby PanSTAR stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.
- Publication:
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GRB Coordinates Network
- Pub Date:
- March 2024
- Bibcode:
- 2024GCN.35944....1L