Difference: 2022PabloDrakeResearchJournal (10 vs. 11)

Revision 112022-08-25 - PabloDrake

Line: 1 to 1
META TOPICPARENT name="2022Journals"

Pablo Drake Research Journal (Summer '22)


Line: 95 to 95



  • Carried out several of the analysis suggested by Qi and Massimo. For example, I tried carrying out 3-month timebins and 5-month timebins, and also a series of 1-day bins for the week around the May 2022 flare. None of these solutions had any effect, with the problem persisting.
06/28 and 06/29
  • Carried out several analysis with an increased ROI, up to 40 degrees. Tried several combinations of ROI radius and time bins, to no avail.
  • Read Variability and Spectral Characteristics of Three Flaring Gamma-ray Quasars Observed by VERITAS and Fermi-LAT by C. B. Adams (https://iopscience.iop.org/article/10.3847/1538-4357/ac32bd). Wrote a set of notes on it.
  • Contacted Isabella Guilherme, an alumn of the VERITAS group who had carried out a series of lightcurve analysis last year, in order to enquire about my problem. They showed me several lightcurve analysis that had been fully completed with a previous version of



Line: 105 to 110
  • Contacted Ari Brill regarding the problem. He asked the following questions, as a sanity check:

    "1) Did the baseline analysis using the entire dataset converge successfully? Were you able to look at the validation plots and see that the results seemed reasonable?

    2) To follow up on what Qi was saying, if you look at the <a data-saferedirecturl="https://www.google.com/url?q=https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name%3D4FGL_J1350.8%2B3033&source=gmail&ust=1660253301149000&usg=AOvVaw2tgbwULgc8vg8pR_R3f9eF" href="https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J1350.8+3033" target="_blank">monthly lightcurve</a>, you can see that there are years-long stretches in between the flares when the source isn't detected at all. So there are parts of the lightcurve that might not be detected even with a 12-week time bin. That shouldn't cause the fit to fail though. It should converge and report an upper limit.

    3) Are you able to see the error message that's printed out? Just to make sure, do you have enough space in your output directory to store all of the output files?"

  -- Massimo Capasso - 2022-06-16
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback