Further Fermi-LAT gamma-ray observations of Nova Sco 2024 (PNV J17261813-3809354)
ATel #16441; C. C. Cheung (NRL), P. Jean (IRAP, Toulouse), on behalf of the Fermi Large Area Telescope Collaboration
on 12 Feb 2024; 20:51 UT
Credential Certification: Teddy Cheung (Teddy.Cheung@nrl.navy.mil)
Subjects: Gamma Ray, >GeV, Nova, Transient
Following the initial Fermi-LAT report of evidence for >100 MeV gamma-ray emission in data from 2024 Feb 9.50 - 9.75 UT (ATel #16439) from the classical nova PNV J17261813-3809354 (= V1723 Scorpii = Nova Scorpii 2024; ATel #16440, CBET #5346), we performed follow-up analyses in 6-hr and 1-day time-bins. Preliminary results indicate a very significant (>5 sigma) detection in the 1-day interval from 2024 Feb 11.0-12.0 UT with a daily averaged (E >100 MeV) flux of (1.9 +/- 0.5) x 10^-6 photons cm^-2 s^-1 and a photon index = 2.3 +/- 0.2 (statistical uncertainties only).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source, we encourage multi-wavelength observations. For this source the Fermi LAT contact person is C.C. Cheung (Teddy.Cheung@nrl.navy.mil).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
