Hrc I Background Maps

The background map is created as follows:

• Add up all HRC I event 1 fits files for a given year.
• Create an image file with bin size of 256x256 pixels.
• Compute the background time of the year (including dead time correction ) normalized to the background count rate per sec per pixel.

The table blow shows an overview of stowed background changes over years. The fist column is year, the second column is a dead time corrected yearly comulative background time. The third column is a stowed background map with event 1 data scaled so that details show up. The fourth column is the same data but unified scale for all years. The fifth and sixth columns are similar to those of the third and the fourth, but status bit corrected data. If you click on the year or one of the maps, it will take to the larger map of the map.

Year	Time (sec) Total Event Numbers	Evt1 (Peak Area)	Evt1 (Same Scale)	Lev2 (Peak Area)	Lev2 (Same Scale)
2000	94,292 3,907,097
2001	67,258 3,070,201
2002	70,560 3,312,125
2003	38,267 1,838,713
2004	42,471 2,717,713
2005	42,450 2,768,383
2006	33,920 2,724,371
2007	47,738 4,539,941
2008	37,129 3,976,703
2009	32,445 4,078,590
2010	16,468 1,967,995
2011	32,467 3,537,743
2012	19,807 1,934,917
2013	51,682 4,682,604
2014	28,793 2,427,420
2015	14,356 1,337,910
2016	16,942 2,661,755
2017	19,774 3,111,414
2018	9,200 1,497,558
2019	14,611 2,457,233
2020	13,630 1,977,865
2021	32,571 4,672,490
2022	2,161 0
Cumulative Maps
Total	778,992 65,200,741

If you have any questions about this page, please contact: swolk@cfa.harvard.edu.