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Comment: Added Feb 10th meeting information

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This working group also supports additional opportunities for coordinated cross-calibration observations between observatories.

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Activity

2023-02-10 - WG meeting on zoom

2021-10-22 - WG meeting on zoom

2021-05-18 - Chairs report at 2021 IACHEC Spring WG meeting is available here

2021-05-13 - WG meeting on zoom

2021-05-18 - Chairs report at 2021 IACHEC Spring WG meeting is available here

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2023 February 10th  - Working group meeting     

 
Held on Zoom   (https://caltech.zoom.us/j/82613799491) 

 

Meeting Time: 1300 UT

5am PST (Los Angeles)

8am EST (New York)1pm GMT (Leicester)
2pm CET (Madrid)6:30pm IST (Mumbai)10pm JST (Tokyo)

Agenda

  • XRISM calibration plans - Eric Miller
  • XRISM scheduling - Chris Baluta
    • communication paths between scheduling teams
    • coordinating observatory data availability / processing
  • 2023 multi-mission coordinated calibration campaign (3C 273) - All

 

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2021 October 22nd  - Working group meeting     

 
Held on Zoom
 
Attending (in alphabetical order):  Sunil Chandra, Hannah Earnshaw, Karl Forster, Felix Fuerst, Elisabeth Jourdain, Jamie Kennea, Renee Ludlam, Kristin Madsen, Herman Marshall, Katja Pottschmidt, Pedro Rodriguez, Celia Sanchez, Maria Santos-Lleo, Norbert Schartel, Yukikatsu Terada, Josh Wing

There were four presentations made during the working group meeting sparking a lively and constructive conversation. The meeting began with a reminder about the calibration observation information posted on the working group google sheets (https://tinyurl.com/4z94r895).

Report on recent coordinated calibration observations:
1ES 0229+200
The observations were organized to investigate the possibility of using this blazar for future cross-calibration campaigns based on the report from Norbert Schartel and Felix Fuerst presented at the last working group meeting. Coordinated observations were performed between 2021-08-08 to 14 by the following observatories:

 

ObservatoryExposure time (ks)  ...and at other wavelengths
Astrosat160 LAXPC (40 ks UVIT) ATOMBVRI
NICER45.9 Effelsberg 100m2cm and 14mm bands
NuSTAR107+65+63 H.E.S.STeV 10 ks/day
Swift20 MAGIC30 GeV - 100 TeV
XMM-Newton122.6   


Crab 

 Coordinated observations by INTEGRAL, XMM-Newton, and NuSTAR continue with the goal of refining the NuSTAR and XMM-pn calibration. Observations coordinated with the IXPE schedule (currently 2022-02-21) are also planned.


3C 273
The annual multi-mission cross-calibration campaign will continue in 2022. Note that an IXPE observation is currently planned for 2022-06-16.

Cross-Calibrations of X-ray Satellites with Quasar 3C 273 - Corin Marasco & Kristin Chapman   (pdf)

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  • Example for 2017 observations:

 

 

Model parameters from the 2017 observations

Cross normalization constants from the pairs of observations are shown on the left. Note:

    • The Swift fluxes appear relatively high - perhaps due to the extraction annulus used - the analysis will be checked wit the Swift team
    • Analysis above 1 keV chosen to avoid known soft excess in 3C 273 spectrum
  • Communication with the Chandra team is underway to check the Chandra analysis
    • The NuSTAR analysis will be redone with the updated calibration released this month (2021 October)
  • NICER observations will also be folded into the analysis (Renee Ludlam)
  • Analysis will be extended to evaluate within the concordance framework (arXiv)
    • Flux ratio examined in narrow energy bands - model independent
  • There is some complexity to the XMM spectrum - Felix Fuerst
    • with correlated residuals between instruments
  • Work is continuing and will include the 2021 XMM-Newton observations as well as the NICER observations.

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