Fermi Gamma-ray Space Telescope

Fermi ToO 090609-1-1

A ToO observation to observe ASAS-SN 17HX at RA, Dec = 277.9413, -19.3154 (J2000) was approved at 2017-06-26 15:08:06 UTC.

The justification for the ToO is: A new Galactic nova has been discovered early in its evolution (before light curve maximum). It is ASASSN-17hx, and is currently observed at a brightness V~12.5 mag (ATel #10523). Last night, it was spectroscopically classified as a nova, showing expansion velocities, FWHM ~ 1200 km/s (ATel #10527). We request Fermi/LAT pointed observations of this outburst in order to place deep limits on GeV gamma-ray luminosity for a wide, diverse sample of Galactic novae.

The planned duration is 500.00 ks.

The autonomous request threshold during this ToO is LOW.

The ToO observation should begin between 2017-06-26 19:59:59 UTC and 2017-06-26 19:59:59 UTC.

The ToO observation was requested by PROF. LAURA CHOMIUK.

Exposure Map for Week 473

Exposure Map
  • Energy Band: 100.00 MeV to 200000.00 MeV
  • The ToO is inserted in the Mission Week 473 timeline from 2017-176-17:33:00 to 2017-180-00:00:00.
  • Exposure is 1.1992e+09 cm^2 s^1 at the ToO location (RA=277.9413, dec=-14.3154)
  • Orbit latitude of the pointing is -1.2249 degrees

Exposure Map for Week 474

Exposure Map
  • Energy Band: 100.00 MeV to 200000.00 MeV
  • The ToO is inserted in the Mission Week 474 timeline from 2017-180-00:00:00 to 2017-182-12:26:00.
  • Exposure is 1.2023e+09 cm^2 s^1 at the ToO location (RA=277.9413, dec=-14.3154)
  • Orbit latitude of the pointing is -20.9832 degrees