Fermi-LAT Gamma-ray Observations of Recurrent Nova V745 Sco
ATel #5879; C. C. Cheung (NRL), P. Jean (IRAP, Toulouse), on behalf of the Fermi Large Area Telescope Collaboration, S. N. Shore (U. Pisa and INFN)
on 12 Feb 2014; 01:18 UT
Credential Certification: Teddy Cheung (ccheung@milkyway.gsfc.nasa.gov)
Subjects: Gamma Ray, >GeV, Nova, Transient
Referred to by ATel #: 5920
We report Fermi Gamma-ray Space Telescope observations of the recurrent nova V745 Sco discovered in outburst on 2014 February 6.694 UT (CBET 3803). Preliminary analysis of the Fermi-LAT data indicates the largest observed significances on Feb 6th and 7th of 2 and 3 sigma, respectively, with a peak daily flux, F(E>100 MeV) ~ (3 +/- 1) x 10^-7 ph cm^-2 s^-1 (statistical error only; photon index of 2.2 was assumed). No significant emission was detected in the subsequent days (through the end of Feb 10th) with daily flux upper limits <(2-3) x 10^-7 ph cm^-2 s^-1 (95% confidence). Note that since Feb 5, Fermi recommenced a modified sky survey profile favoring the Galactic center region (http://fermi.gsfc.nasa.gov/ssc/proposals/alt_obs/obs_modes.html) leading to enhanced exposure at the nova position.
We strongly encourage multiwavelength observations. For this source the Fermi LAT contact persons are C.C. Cheung (Teddy.Cheung@nrl.navy.mil) and P. Jean (Pierre.Jean@irap.omp.eu).
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.
