Fermi Gamma-ray Space Telescope

Fermi ToO 080606-1-1

A ToO observation to observe PSR J1119-6127 at RA, Dec = 169.8096, -61.4637 (J2000) was approved at 2016-08-01 18:06:45 UTC.

The justification for the ToO is: PSR J1119-6127 is a high-B (4.0E14 G) pulsar (0.4 s) detected from radio to gamma-rays, including in the 0.1-300 GeV range with LAT. On 27 July 2016, it emitted two magnetar-like bursts seen with GBM and BAT. This caused an increase of 2 orders of magnitude in its X-ray flux. Moreover, pulsations in X-rays are now detected up to higher energies, while radio pulsations disappeared. Comparing the X-ray pulse arrival time to the previous ephemeris, it appears that the source has undergone a strong spin-up glitch during this outburst. We propose a week-long observation with LAT to search for any time evolution of the high energy spectrum and pulse profile during the outburst, and determine whether it correlates with its behavior at other energies.

The planned duration is 605.00 ks.

The autonomous request threshold during this ToO is LOW.

The ToO observation should begin between 2016-08-01 18:06:44 UTC and 2016-08-08 18:06:44 UTC.

The ToO observation was requested by DR. GEORGE ASSAF YOUNES.