• Ana, Ariel, Benjamin, Dominique, Estelle, Jacco, Jakob, Joel, Martin, Mat, Mattia, Maxime C, Maxime D, Melissa, Mickael, Nicolas, Simeon, Suhail, Valery, Young-Lo

• ZTF21aapexph: SNIa with a bump! Trinity to get spectra.
• ZTF21aaplnxw: Overluminous (-20): SuperChandra? We don't have many of these on the rise.
• ZTF21aapvsxv: Looking like it's going to be underluminous.

• ZTF is now releasing a public newsletter along with every data release.
  • Contains interviews, ads, spotlights on people, some science news. Aimed at a wide audience.
• Rahul & Ariel have covered this months. Maybe Maxime's work would be good next month.

Mickael on ztfquery.fritz:

• Major update to work with fritz.
  • There are now tutorials with specific examples
• Can download photometry, alerts, sources and spectroscopy
• https://github.com/MickaelRigault/ztfquery
  • Specific objects: get_data, get_redshift, get_lightcurve, download_alerts, get_reference_timeframe
  • Groups / samples: fritz.groups; download_sample; download_sources. Integrated with dask.
  • Access: FritzAccess: tells you what you can have access to.
• Follow the tutorials and ask Mickael: it does loads
• What papers can come out of this? Let's do some brainstorming. If nothing else: cite it!

• dark energy measurements rely on anchors / high-z samples; fsigma_8 doesn't: it's ZTF only.
  • this is the survey niche: expertise/interest in Stockholm, Marseille, Berlin and Lyon.
  • are existing measurements better than us? No: this should be fast-tracked.
• Mickael: the problem is software to account for bias / selection? (Howlett)
  • many tools are available though. is our 'zero' effort work really not competitive?
  • velocity velocity comparison is easy, velocity density crossmatching is harder.
  • some paper assume density from galaxies and don’t refit and this is faster, but may bias (if mismatch)
• Jakob: calibration is the other big uncertainty
  • sky position calibration errors (homogeneity in the sky) is key.
  • this shouldn't hold us up though: we're probably already competitive.
• we should come up with a roadmap.
  • who can commit time?
  • what should come first: calibration or measurements? what floor are we aiming at? the data should drive this.
    • we need to document how good calib is wrt position in sky, moon phase, etc. i.e. estimate systematics.
    • CCD dependent residuals is another issue. Since we don’t dither, some SN will be in high mag, some in low.
  • this was discussed a year ago: progress is being made? there is a plan

ZTF Ia Phone-con: 2021-Mar-31

Meeting Agenda:

1. SNe of the week [Joel J]

2. ZTF Public Newsletter [the group]

3. PSF modelling update [Mickael R]

4. Measuring f sigma_8 / getting something out now [the group]

5. AOB / Close

-

Participants (XX):

Notes:

Transients of the Week:

Everyone on the newsletter:

Mickael on PSF modeling:

Everyone on fσ8:

Closing Remarks:

• Sign up for a talk!