EGAL02

Proposal

Proposal: EGAL02:Observations of distant bright FSRQs in active states
PI: Seiya Nozaki (nozaki@mpp.mpg.de)

  Source: 3C454.3 

    RA (J2000) 343.49061685 deg 

    DEC (J2000) 16.14821153 deg 

  Source: Ton599 

    RA (J2000) 179.88264131 deg 

    DEC (J2000) 29.24550745 deg 

Observational settings/limits

- original criteria to observe Ton 599

we request 50 hours of observations unless the average integral photon flux (>100 MeV) goes down below 0.5×10−6 cm−2 s−1

It seems the gamma-ray spectrum of Ton 599 is sometimes hard (<2.0) (especially since April) and variable. So even when integral photon flux above 100 MeV is below the original limit (0.5x10-6 cm-2 s-1), there is a possibility to detect this source. When the spectrum is hard enough (e.g. April 23, 2023), it is detectable for a short observation. Thus, we want to request to schedule short exposure observations (1-1.5 hours) for monitoring purposes, rather than longer exposure for less nights, when this source can be scheduled (=no collision with other higher priority tasks/sources).

Performed observation

Ton 599

• 2023-04-19 (no detection)
  • run 12768, 12769, 12770, 12771, 12772, 12774
• 2023-04-23 (3-5 sigma?)
  • run 12832, 12833, 12834, 12835
• 2023-05-11 (no detection)
  • run 12941, 12942, 12943, 12944, 12945

Analysis

- Summary (Ton599) https://docs.google.com/presentation/d/1gaDXn9cRdHN7RWg4m9iZqNLSwOAlH4m0W2f5V8CqSI8/edit?usp=sharing