Improved Localization of the Fermi-LAT Gamma-ray Transient in the Galactic Plane: Fermi J0614+1713
ATel #15199; I. Mereu (INFN Perugia), C. C. Cheung (NRL), S. Ciprini (ASI Space Science Data Center, Roma, & INFN Roma Tor Vergata), on behalf of the Fermi-LAT collaboration
on 4 Feb 2022; 15:27 UT
Credential Certification: Teddy Cheung (Teddy.Cheung@nrl.navy.mil)
Subjects: Gamma Ray, >GeV, Request for Observations, Transient
ATel #15196 reported the Fermi-LAT detection of Fermi J0614+1713, a new gamma-ray transient in the Galactic plane on Jan 31, 2022. Preliminary follow-up analysis of earlier LAT data from Jan 27-30 indicates this source was detected at >3-sigma significance in 1-day intervals on Jan 29 and 30, and in the last 6 hr interval of Jan 28 (18:00-24:00). The source was not significantly detected after the initially reported detection in 1-day intervals (i.e., on Feb 1, 2 and 3).
Summing the detections from the 3.25 days beginning on the last 6 hr interval of Jan 28 resulted in an improved localization for the gamma-ray source, with a best-fit (J2000) position of RA = 93.48 deg, Decl. = 17.18 deg (Galactic coordinates: l, b = 193.43 deg, -0.22 deg), with a 95% containment radius of 0.17 deg (errors are statistical only). The averaged gamma-ray flux (E >100 MeV) was (8.7 +/- 1.8) x 10^-7 ph cm^-2 s^-1, with a photon index, Gamma = 2.28 +/- 0.13. The magnetic CV, Swift J0614.0+1709, noted in ATel #15196 remains located within the improved LAT localization.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Isabella Mereu (mereuisabella at gmail.com).
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.
