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

- 3C454.3

The observations should be organized through the ToO form when the integral photon flux (>100 MeV) reaches 1×10−5 cm−2 s−1. 
In this state, LST-1 is expected to detect low-energy gamma-ray signals with ∼30 hours of observations. 
If we detect a significant flare and the integral photon flux is still above the mentioned threshold after the flare, we also request another 30 hours of observations after the flare

- 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 (1-2 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). If we detect some signs of active state (e.g. high energy photons), we will contact schedulers.

Analysis

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

- wiki page -- https://www.lst1.iac.es/wiki/index.php/TON599 -- https://www.lst1.iac.es/wiki/index.php/3C454.3