Important notice for HXI data (June 12, 2024)

All HXI data products have been re-produced based on energy calibration. The new data products for observations since Apr. 1， 2023 were online on Jun. 12，2024. If you are interested in the data observed between Oct. 21，2022 and Apr. 1，2023, please contact HXI team.

(1) The new energy calibration improved the correction of the non-linear effect for energies below ~25 keV. Spectral fitting and imaging at low energies are therefore improved.

(2) You may check the file name of the Lev 1 FITS and the DPS plot for the latest data version or check the header of Lev 1 FITS for the latest version of the production software (‘code_ver’ = 1.7).

(3) The new version of HXI GUI will be released in this month. HXI_Clean will be improved with the latest calibration results. VIS_Clean will be available for imaging with semi-corrected visibilities.

Important notice for HXI data (Oct. 31 2023)

All HXI data products have been re-produced based on improved energy calibration. The new data for observations since 1 Apr. 2023 were online on 30 Oct. 2023.

(1) If you are interested in the data observed between 21 Oct. 2022 and 1 Apr. 2023, please contact HXI team.

(2) Currently, the HXI GUI (v1.24beta) does not provide imaging calibration. The next version of the GUI and the user guide will be online within ten days and provide preliminary imaging calibration, new function for selecting background (which is very important for imaging), new function for merging spectra data from different detectors.

(3) For most of the observations, you may use the new light curve data (cts_thinthick) provided in Q1 FITS, which are the average count rate of three total flux monitors and provides the best SN ratio. You can find the PNG file in the ‘Image Browser’ for quicklook.

(4) If you are using the data for scientific purposes, it is suggested that you contact HXI team to confirm the results, especially images. HXI team will help confirm or make the images.

Important note for HXI users: (Aug. 27 2023)

All HXI data is being re-produced as planned based on the new Level 0 data and new production software (v1.5 beta, which includes improved energy calibration). This process will take a few days to a week. 

Please wait for the new products. 

Thanks to Albert Y. Shih's efforts, the HXI quicklook plots can be also viewed from the RHESSI Browser 2.0 since July 2023. 

At the current stage, imaging calibration and visibility calibration (hxi_vis_clean or hxi_vis_bp are not ready for science) are still in progress. Background removal may be difficult and case by case. 

Therefore, we encourage users to follow the data policy and contact HXI science team if you want to use HXI images in publications. The team will help producing images (once the calibration is done and the GUI is ready, users can make images). 

The next update for HXI GUI will be released in a few weeks. 

We would be happy to accept your suggestions on how to improve HXI data and software. 

Many thanks. 

Aug. 27 2023

Yang Su, on behalf of HXI team