INTEGRALPlanckGaiaPOLARCHEOPSEuclidATHENA
HEAVENSFACTCTALOFTSPICAJEM-EUSOXIPEeXTPTheseus
XRISMMAGBOUNDSMARTNet
ISDCCDCI
INTEGRAL Science Data Centre
ISDC Frequently Asked Questions
Frequently Asked Questions

  or     in all 146 FAQs

Note: The search is case insensitive, so use lower case characters to avoid confusion with categories. For clarity, answers are only displayed for a string search matching less than 10 FAQs.

What is the Crab count rate in IBIS/ISGRI ? [ IBIS-019 : 2007-NOV-20 ]

The Crab off-axis corrected ISGRI count rates for the Crab (pulsar + nebula) with OSA 7, taken from spectral extraction are as follows: 

17.3  -  63.3 keV: constant level 337 cps up to IJD 2000, then linear decrease
                   down to 326 cps at IJD 3000.
21.1  -  40.3 keV: 180 cps up to IJD 2000, then again linear decrease to 172 cps
40.3  - 101.6 keV: behaviour similar to above two bands, 115 cps, then 110 cps.
101.6 - 312.2 keV: opposite situation, linear increase from 23 cps at IJD 1000
                   to 26.5 cps at IJD 2000, then constant.
Those count rates can simply be added for an extended spectral range. [see also IBIS-026] [see also SPI-007]

Created on 2005-JUN-03. Updated on 2007-NOV-20. Answered by Piotr Lubinski
Complementary information can be found in the ISDC Glossary and in OSA Known Issues.
Please send unanswered questions to the INTEGRAL Helpdesk.
To add or update an FAQ entry, please contact the Webmaster.