XL-Calibur Non-refereed Publications

  1. Development of Small-Pixel CZT Detectors for Future High-Resolution Hard X-ray Missions
    Beilicke, M, NASA APRA Proposal, 155 (2011)
  2. Design of a Hard X-ray Polarimeter: X-Calibur
    Guo, Q et al., arXiv, 1101, 0595 (2011)
  3. The Hard X-ray Polarimeter X-Calibur - Design and Tests
    Beilicke, M et al., arXiv, 1109, 6850 (2011)
  4. News and Views: Big mirror cast; X-Calibur afloat; Harpoon that comet!
    A&G, 53, 0112 (2012)
  5. The hard X-ray polarimeter X-Calibur
    Beilicke, M et al., High Energy Gamma-Ray Astronomy: 5th International Meeting on High Energy Gamma-Ray Astronomy, 805 (2012)
  6. Exploring the Hard X-ray Polarization of Southern Hemisphere X-ray Sources with a Long Duration Balloon Flight of X-Calibur
    Krawczynski, H, NASA APRA Proposal, 119 (2012)
  7. Theoretical Motivations for Polarization Studies in X-ray Astronomy & the Status of X-Calibur
    Cowsik, R, 39th COSPAR Scientific Assembly, 373 (2012)
  8. Status and Performance of the Hard X-Ray Polarimeter X-Calibur
    Kislat, F et al., AAS, 221, 32802 (2013)
  9. Observations of Accreting Black Holes in X-ray binaries with the X-Calibur Hard X-ray Polarimeter
    Guo, Q et al., AAS, 221, 42104 (2013)
  10. The Hard X-ray Polarimeter X-Calibur - Astrophysical Motivation and Performance
    Beilicke, M et al., HEAD, 13, 12317 (2013)
  11. Simulation and Laboratory results of the Hard X-ray Polarimeter: X-Calibur
    Guo, Q et al., AAS, 223, 20205 (2014)
  12. The hard X-ray polarimeter X-Calibur
    Beilicke, M, HEAD, 14, 10406 (2014)
  13. Blazar Observations with the Space-Borne X-Calibur X-Ray Polarimeter
    Guo, Q et al., HEAD, 14, 10620 (2014)
  14. Tests of General Relativity in the Strong Gravity Regime With the Space-Borne X-Calibur X-ray Polarimeter
    Hoormann, J et al., HEAD, 14, 11613 (2014)
  15. The Study of Highly Magnetized Neutron Stars with X-ray Polarimetry Observations
    Krawczynski, H, 40th COSPAR Scientific Assembly, 1645 (2014)
  16. Design and Tests of the Hard X-ray Polarimeter X-Calibur
    Beilicke, M et al., Multifrequency Behaviour of High Energy Cosmic Sources, 293 (2014)
  17. Systematic and Performance Tests of the Hard X-ray Polarimeter X-Calibur
    Endsley, R et al., AAS, 225, 33715 (2015)
  18. Status of the Balloon-Borne X-ray Polarimetry Mission X-Calibur
    Krawczynski, H et al., HEAD, 15, 11620 (2016)
  19. Exploring the Hard X-ray Polarization of Southern Hemisphere X-Ray Sources with a Long-Duration Balloon Flight of X-Calibur
    Krawczynski, H, NASA APRA Proposal, 68 (2016)
  20. X-Ray Polarimetry with X-Calibur and PolSTAR
    Krawczynski, E, Frontier Research in Astrophysics II (FRAPWS2016), 80 (2016)
  21. XL-Calibur: Plans for a Next-Generation Hard X-ray Polarimeter
    Abarr, Q, AAS, 234, 11601 (2019)
  22. Results From the Antarctic Balloon Flight of the Hard X-ray Polarimeter X-Calibur
    Kislat, F et al., AAS, 234, 21508 (2019)
  23. Study of the Systematic Errors of the Polarization Fraction and Angle Measurements with the X-Calibur Hard X-ray Polarimetry Mission
    Abarr, Q et al., HEAD, 17, 10976 (2019)
  24. Performance of the X-Calibur Hard X-ray Polarimetry Mission During the 2018-2019 Long Duration Balloon Flight
    Kislat, F et al., HEAD, 17, 10978 (2019)
  25. The Next-Generation Balloon-Borne Hard X-ray Polarimeter XL-Calibur
    Kislat, F, HEAD, 17, 10979 (2019)
  26. Swift and NICER observations of the X-ray binary GX 301-2 during the X-Calibur balloon campaign in December 2018.
    Errando, M et al., HEAD, 17, 11108 (2019)
  27. A long, broadband X-ray study of Vela X-1 and its environment
    Fuerst, F et al., HEAD, 17, 11258 (2019)
  28. Results from the Observations of the Accreting X-Ray Pulsar GX 301-2 with the X-Calibur Hard X-ray Polarimetry Mission
    Krawczynski, H et al., HEAD, 17, 40106 (2019)
  29. Observing Neutron Stars and Black Holes with the Hard X-ray Polarimeter XL-Calibur
    Lisalda, L et al., AAS, 235, 43708 (2020)
  30. Evaluating the Calibration of SN Ia Anchor Datasets with a Bayesian Hierarchical Model
    Currie, M et al., arXiv, 2007, 02458 (2020)
  31. Using Polarization Spectra as a Measure of Disk Thickness in Black Hole Systems
    West, A & Krawczynski, H, AAS, 237, 40403 (2021)
  32. Measuring Black Hole Spins and Constraining the Shapes and Locations of the Coronas of Stellar Mass Accreting Black Holes with the Upcoming IXPE and XL-Calibur X-ray Polarization Missions
    Krawczynski, H, AAS, 237, 40404 (2021)
  33. Implementing and investigating the numerical accuracy of the exact Compton scattering in the x-ray reflection from the black hole accretion disk
    Hossen, M et al., AAS, 237, 40408 (2021)
  34. Design and Performance of the Next-Generation Hard X-Ray Polarimeter XL-Calibur
    Lisalda, L & XL-Calibur Collaboration, AAS, 237, 43501 (2021)
  35. XL-Calibur, the next-generation balloon-borne hard X-ray polarimeter
    Takahashi, H et al., 43rd COSPAR Scientific Assembly. Held 28 January - 4 February, 1665 (2021)
  36. Probing magnetar magnetospheres and fundamental QED physics via X-ray polarimetry
    Baring, M et al., 43rd COSPAR Scientific Assembly. Held 28 January - 4 February, 1667 (2021)
  37. Hard X-ray polarimetry in the stratosphere
    Takahashi, H & Pearce, M, 43rd COSPAR Scientific Assembly. Held 28 January - 4 February, 2304 (2021)
  38. Performance of the X-Calibur Hard X-Ray Polarimetry Mission during its 2018/19 Long-Duration Balloon Flight
    Abarr, Q et al., arXiv, 2204, 09761 (2022)
  39. The Next-Generation Hard X-ray Polarimeter XL-Calibur
    Kislat, F et al., HEAD, 19, 20402 (2022)

Latest News

Oct 2023

New XL-Calibur launch window
The new XL-Calibur launch window from Kiruna, Sweden, is set from May 7 to July 15 2024.

Oct 2022

Update on the XL-Calibur Jul 2022 flight
the 6-day long flight had to contend with an accidental drop of the entire flight ballast at one side of the gondola, leading to 3.5 days of recovery operations without science observations. Furthermore, a mirror alignment error prevented the observations of the X-ray targets in the remaining time.

12 Jul 2022

Successful XL-CALIBUR launch
XL-CALIBUR was launched in the early morning hours of 12 July 2022 (local time) from Esrange under excellent launch conditions. The balloon carried the payload to 130,000 feet altitude until the mission was terminated over northern Canada on July 18, 2022.

30 Jun 2022

XL-CALIBUR launch attempt #2
XL-CALIBUR planned launch early 1 July 2022 scrubbed due to wind conditions. Next planned launch attempt 2 July 2022 (early morning local time)

24 Jun 2022

XL-CALIBUR launch scrubbed
The payload was rigged for flight, but weather conditions prevented the planned launch.