Bright gamma-ray emission from TCP J04432130+4721280 (V392 Per) detected by Fermi-LAT

ATel #11590; Kwan-Lok Li, Laura Chomiuk, and Jay Strader (Michigan State University)
on 1 May 2018; 02:26 UT
Credential Certification: K. L. Li (lilirayhk@gmail.com)

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We report the Fermi-LAT detection of the optical transient TCP J04432130+4721280 (V392 Per), which was discovered by Yuji Nakamura on 2018-04-29.4740 (CBET #4515) and later identified as a Galactic nova by Wagner et al. (ATel #11588). Using the Fermi-LAT data collected from 2018-04-30 00:00:00 to 23:25:53 UT, a strong gamma-ray source was detected at the nova position. There is no known LAT source within 2 degrees around the nova. Assuming a simple power law spectrum, the photon flux is F(100MeV-300GeV) = (8.9 +/- 2.9) x 10^-7 ph/cm^2/s, with a photon index of 1.9 +/- 0.2 and TS = 40 (equivalent to a ~6 sigma detection). We also performed a gtfindsrc analysis to find the optimized position of the gamma-ray source, which is well consistent with V392 Per's.

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.