XL-Calibur Image Gallery: Science
All figures shown here are from the GX301-2 observations made by the
X-Calibur flight in December 2018, one of the two targets studied
during the flight. These figures appear in
Abarr, Q et al., ApJ, 891, 70 (2020).
![](/docs/xlcalibur/gallery/images/gx301m2_polarization_constraints.png)
X-Calibur constraints on the linear polarization of GX301-2 at 15–35 keV
in the plane of the normalized Stokes parameters (with 1σ statistical
error bars):
- black filled circle: entire data set
- red square: the main pulse (phase 0.8–1.14)
- green triangle: secondary pulse (phase (0.14–0.8)
Polarization fractions are shown for illustrative purposes as:
- center: Q = U = 0 (0%)
- red circle: 30%
- black circle: 100%
![](/docs/xlcalibur/gallery/images/gx301m2_polarization_time.png)
Q (filled circles) and U (open circles) parameters for the background-subtracted
on source (red) and off source (black) as a function of time.
![GX301-2 detection rates at apastron flare as seen by X-Calibur](/docs/xlcalibur/gallery/images/gx301m2_rate.png)
GX301-2 detection rates around the apastron flare as seen by X-Calibur,
Swift BAT, NICER, and Swift XRT.
Movies
![Still frame from presentation on X-ray Polarimetry of Microquasers with IXPE and XL-Calibur](/docs/xlcalibur/gallery/images/polarimetric_observations_snapshot.png)
Principal Investigator Henric Krawcyznski discusses plans and modeled data
to explain how polarimetry observations of known black holes will provide
new insights on extreme condition physics (33 min;
640 x 360 MP4 (53.4 MB);
YouTube).