Hi,
I report the observation of TDE AT2025aarm announced by the TNS (AstroNote 2025-311) and supported by Michel Dennefeld (RAPAS-mail of 2/11/2025) with our 0.432 m telescope of the SpaceObs AITP observatory in San Pedro de Atacama in Chile, using a CMOS camera QHY268M. Series of 5 images, with an exposure time of 180 s, were achieved through the Sdss-g, Sdss-r, Sdss-i filters and an L filter (420-685 nm)~Gaia GBp. Each series of 5 images was calibrated with Tycho-Tracker (Ted Parrott) and stacked into a median sum with AstroimageJ. The stacked images were uploaded to STDWeb, the web-based tool for photometry and transient detection in astronomical images, based on the STDPipe library and developed by Sergey Karpov (Karpov, S. (2025). STDweb: Simple transient detection pipeline for the web. Acta Polytechnica, 65(1), 50-64. https://doi.org/10.14311/AP.2025.65.0050) and hosted by the Observatoire de Bretagne Sud, 56390 Grand Champ and financed by Pierre-Yves Lechapelain. The images were calibrated using the Pan-STARRS DR1 reference catalog for Sloan filters and Gaia eDR3 for the Gaia-GBp filter.
Here are the results:
The instrument at the AITP Observatory in San Pedro Atacama, Chile is a Planewave CDK17’’ equipped with a QHY268M camera on an Astelco NTM500 mount. Its position is 068 10 47.98 W, 22 57 12.52 S, Alt; 2399m, Code W96.
Roger Hellot
Tel: +33 6 08 54 80 93
Mail: roger.hellot.astro@gmail.com
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