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The Fermi-LAT detection of PNV J11261220-6531086

ATel #11201; Kwan-Lok Li (Michigan State University), Koji Mukai (NASA/GSFC), Thomas Nelson (University of Pittsburgh), and Laura Chomiuk (Michigan State University)
on 19 Jan 2018; 16:10 UT
Credential Certification: K. L. Li (lilirayhk@gmail.com)

Subjects: Gamma Ray, Nova

Referred to by ATel #: 11212, 11296, 11298

We report a possible gamma-ray detection of the Galactic nova candidate PNV J11261220-6531086 (CBET #4472). Since 2018-01-11UT, a significant gamma-ray source has been seen in the direction of the nova candidate with averaged TS = 65 (8-sigma detection significance) and F(100MeV-300GeV) = 2.4 x 10^-7 ph/cm^2/s (photon index of 2.2 assumed). We also performed a gtfindsrc analysis to constrain the position of the source, which is well consistent with the nova position: RA (J2000) 11h 26m 15.16s, DEC (J2000) -65d 31' 23.3". The daily TS of the last four days are 14 (Jan 15), 33 (Jan 16), 14 (Jan 17), and 12 (Jan 18) with F(100MeV-300GeV) ~> 10^-7 ph/cm^2/s, indicating that the nova is still active in gamma-rays.

A Fermi ToO program for the transient is on-going until 2018-01-22 18:03:26 UTC. Swift and SOAR follow-up observations have been scheduled. More multi-wavelength observations are strongly encouraged.

We thank the Fermi Science Support Center, supported by the Flight Operations Team, for scheduling the Fermi ToO observations.