AstroSat UVIT observations of the 2022 outburst of Recurrent Nova M31N2008-12a
ATel #15810; Judhajeet Basu (IIA), Sudhanshu Barway (IIA), G. C. Anupama (IIA), K. P. Singh (IISER Mohali)
on 15 Dec 2022; 08:08 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Sudhanshu Barway (sudhanshu.barway@iiap.res.in)
Subjects: Ultra-Violet, Nova
Referred to by ATel #: 15902
We report the detection of the 2022 outburst of the recurrent nova M31N2008-12a (ATel #15786, #15787, #15788, #15789, #15790, #15795, #15797, #15798, #15802 ) with the 37.5 cm Ultra Violet Imaging Telescope (UVIT) on board AstroSat. The source was clearly detected at a threshold of > 5 sigma with FUV CaF2 filter centred at 148.5 nm with a width of 50 nm.
M31N2008-12a was observed during 6 orbits of AstroSat. Orbit-wise images were stacked to obtain an image with net exposure of 7872 seconds. The recurrent nova was detected at an AB magnitude of 20.578 +/- 0.050 on 2459920.736 JD, around 4.5 days after the outburst. Detailed analysis is underway.
UVIT L1 data was reduced using CCDLAB (Postma and Leahy, 2017) and PSF photometry was performed using standard IRAF procedures.
We thank the AstroSat team for their positive response to our ToO request to observe M31N2008-12a. We also thank members of ISSDC at ISRO and UVIT-POC at IIA for making the data available at the earliest.
