Upper limit on TeV emission from Fermi J0139.5+2928 measured with HAWC
ATel #12892; Daniela Dorner (University of Würzburg), Antonio Galvà n (UNAM), Israel Martinez (University of Maryland)
on 27 Jun 2019; 00:01 UT
Credential Certification: Daniela Dorner (dorner@astro.uni-wuerzburg.de)
Subjects: TeV, VHE, Transient
The HAWC Collaboration reports an upper limit for the flux at TeV
energies of the gamma-ray source Fermi J0139.5+2928 during June
23rd, 2019.
On June 23rd, 2019, Fermi-LAT detected a new gamma-ray source at GeV
energies (ATEL #12888). For June 26, 2019, the FACT Collaboration
reported an upper limit of 1.2 times the flux of the Crab Nebula at TeV
energies (ATel #12891).
HAWC observed the source with a zenith distance smaller than 45 degree
on June 23rd, 2019, between 10:51 UTC and 17:17 UTC (ontime 6.43
hours). From this observation, no signal was found from the position of
Fermi J0139.5+2928 (R.A. = 24.88 deg, Decl. = +29.47 deg (J2000)). An
upper limit for the integral flux above 1 TeV of 6.5x10^-12
photons/cm2/s has been determined at 95% CL, assuming a PL index of
2.3. This is consistent with the Fermi measurement.
HAWC is a TeV gamma-ray water Cherenkov array located in the state of
Puebla, Mexico, that monitors 2/3 of the sky every day with an
instantaneous field of view of ~2 sr. The HAWC contact people for this
analysis are Antonio Galvan (agalvan@astro.unam.mx) and Israel Martinez
(imc@umd.edu).
