Difference between revisions of "Fermi LAT Main OP313"

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=== Parameters ===
 
=== Parameters ===
  
RA      =        197.6324  degrees
+
RA      =        197.6324  degrees
 
+
Dec    =        32.3547  degrees
Dec    =        32.3547  degrees
+
Start  =        715617241.0  MET (s)
 
+
Stop    =        727281241.0  MET (s)
Start  =        715617241.0  MET (s)
+
ROI    =        10.0  degrees
 
+
E min  =        100.0  MeV
Stop    =        727281241.0  MET (s)
+
E max  =        300000.0  MeV
 
+
E min ext      =        50.11872336272722  MeV
ROI    =        10.0  degrees
+
E max ext      =        598578.6944906638  MeV
 
+
IRFs    =        P8R3_SOURCE_V3
E min  =        100.0  MeV
+
evclass =        128
 
+
evtype  =        3
E max  =        300000.0  MeV
 
 
 
E min ext      =        50.11872336272722  MeV
 
 
 
E max ext      =        598578.6944906638  MeV
 
 
 
IRFs    =        P8R3_SOURCE_V3
 
 
 
evclass =        128
 
 
 
evtype  =        3
 
  
  
Line 68: Line 57:
 
=== Low ===
 
=== Low ===
  
Decorrelation energy : 4.14e+02 MeV
+
The spectrum is best described by a logparabola with a TS = 7
  
TS :  1356.0178181243173
+
Decorrelation energy : 4.14e+02 MeV
 
+
TS :  1356.0178181243173
norm :  108.86 +/-  6.16 [ -6.05, + 6.27 ] 1e-12
+
norm :  108.86 +/-  6.16 [ -6.05, + 6.27 ] 1e-12
 
+
alpha :  2.03 +/-  0.08 [ -0.08, + 0.07 ] 1e+00
alpha :  2.03 +/-  0.08 [ -0.08, + 0.07 ] 1e+00
+
beta :  0.08 +/-  0.04 [ -0.03, + 0.04 ] 1e+00
 
+
Eb :  414.00  1e+00
beta :  0.08 +/-  0.04 [ -0.03, + 0.04 ] 1e+00
 
 
 
Eb :  414.00  1e+00
 
  
  
Line 86: Line 72:
 
=== Mid ===
 
=== Mid ===
  
Decorrelation energy : 4.66e+02 MeV
+
The spectrum is best described by a logparabola with a TS = 8
 
+
Decorrelation energy : 4.66e+02 MeV
TS :  2584.4997249984517
+
TS :  2584.4997249984517
 
+
norm :  238.16 +/-  11.60 [ -11.40, + 11.80 ] 1e-12
norm :  238.16 +/-  11.60 [ -11.40, + 11.80 ] 1e-12
+
alpha :  1.79 +/-  0.05 [ -0.06, + 0.05 ] 1e+00
 
+
beta :  0.06 +/-  0.02 [ -0.02, + 0.02 ] 1e+00
alpha :  1.79 +/-  0.05 [ -0.06, + 0.05 ] 1e+00
+
Eb :  466.00  1e+00
 
 
beta :  0.06 +/-  0.02 [ -0.02, + 0.02 ] 1e+00
 
 
 
Eb :  466.00  1e+00
 
  
  
Line 106: Line 88:
 
The spectrum is best described by a logparabola with a TS = 80
 
The spectrum is best described by a logparabola with a TS = 80
  
Decorrelation energy : 5.66e+02 MeV
+
Decorrelation energy : 5.66e+02 MeV
 
+
TS :  8991.45
TS :  8991.45
+
norm :  467.06 +/-  14.19 [ -13.97, + 14.41 ] 1e-12
 
+
alpha :  1.57 +/-  0.03 [ -0.03, + 0.03 ] 1e+00
norm :  467.06 +/-  14.19 [ -13.97, + 14.41 ] 1e-12
+
beta :  0.10 +/-  0.01 [ -0.01, + 0.01 ] 1e+00
 
+
Eb :  564.00  1e+00
alpha :  1.57 +/-  0.03 [ -0.03, + 0.03 ] 1e+00
 
 
 
beta :  0.10 +/-  0.01 [ -0.01, + 0.01 ] 1e+00
 
 
 
Eb :  564.00  1e+00
 
  
  
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| [[File:sanitylow.png|thumb|centre|400px|Fermi-LAT SED low]]   
 
| [[File:sanitylow.png|thumb|centre|400px|Fermi-LAT SED low]]   
 
|}
 
|}
 +
 +
 +
== Fermi-LAT analysis on the LST GTI ==
 +
 +
The Fermi-LAT pipeline allow to run an analysis based on pre-defined GTI. This has been done using the LST observation time. For this the December and January data set were separated since they correspond to 2 different flux states.
 +
 +
GTI correspond to the LST observation time after data selection, plus or minus 1 hour
 +
 +
=== December ===
 +
 +
* GTI definition :
 +
 +
 +
723873640.4679999 723885814.544
 +
723961205.0 723972636.3690003
 +
724045627.3670001 724058152.8549998
 +
724131722.0 724143939.893
 +
724218276.9149997 724231900.1550002
 +
724304640.2630002 724318201.9809997
 +
724390555.44 724404422.1790001
 +
724477321.222 724491352.339
 +
724563718.779 724577641.8430002
 +
724650067.315 724663888.9659998
 +
 +
* results
 +
 +
 +
The spectrum is best described by a logparabola with a TS = 8
 +
 +
Decorrelation energy : 6.36e+02 MeV
 +
TS :  485.58040012843094
 +
norm :  319.83 +/-  42.96 [ -37.51, + 0.00 ] 1e-12
 +
alpha :  1.47 +/-  0.14 [ -0.15, + 0.14 ] 1e+00
 +
beta :  0.15 +/-  0.06 [ -0.06, + 0.07 ] 1e+00
 +
Eb :  631.00  1e+00

Revision as of 14:15, 19 February 2024

The Fermi LAT analysis has been performed on a large time scale to derive a long-term light curve and run a Bayesian block analysis to defined bocks of observation

Parameters

RA      =        197.6324  degrees
Dec     =        32.3547  degrees
Start   =        715617241.0   MET (s)
Stop    =        727281241.0   MET (s)
ROI     =        10.0  degrees
E min   =        100.0  MeV
E max   =        300000.0  MeV
E min ext       =        50.11872336272722  MeV
E max ext       =        598578.6944906638  MeV
IRFs    =        P8R3_SOURCE_V3
evclass =        128
evtype  =        3


Long term Fermi-LAT Light curve

This plot is the Fermi-LAT LC with the final bayesian block description. The block are given in the table after

Fermi-LAT BB light-curve


In the High state, I used bins of around 12 hours, 1 day in the Mid state and 3 days in the low state

Date MET start MET stop N bins
high 722300909 722984524 16
723877193 724823786 22
Mid 722104724 722300909 2
722984524 723877193 10
724823786 725266164 5
726394414 726767552 4
Low 716277470 722104724 22
725266164 726394414 4
726767552 727281241 2


SEDs

For each SED, a powelaw and a logparabola model were tested

Low

The spectrum is best described by a logparabola with a TS = 7

Decorrelation energy : 4.14e+02 MeV
TS :  1356.0178181243173
norm :  108.86 +/-  6.16 [ -6.05, + 6.27 ] 1e-12
alpha :  2.03 +/-  0.08 [ -0.08, + 0.07 ] 1e+00
beta :  0.08 +/-  0.04 [ -0.03, + 0.04 ] 1e+00
Eb :  414.00   1e+00


Fermi-LAT SED Low

Mid

The spectrum is best described by a logparabola with a TS = 8
Decorrelation energy : 4.66e+02 MeV
TS :  2584.4997249984517
norm :  238.16 +/-  11.60 [ -11.40, + 11.80 ] 1e-12
alpha :  1.79 +/-  0.05 [ -0.06, + 0.05 ] 1e+00
beta :  0.06 +/-  0.02 [ -0.02, + 0.02 ] 1e+00
Eb :  466.00   1e+00


Fermi-LAT SED Mid

High

The spectrum is best described by a logparabola with a TS = 80

Decorrelation energy : 5.66e+02 MeV
TS :  8991.45
norm :  467.06 +/-  14.19 [ -13.97, + 14.41 ] 1e-12
alpha :  1.57 +/-  0.03 [ -0.03, + 0.03 ] 1e+00
beta :  0.10 +/-  0.01 [ -0.01, + 0.01 ] 1e+00
Eb :  564.00   1e+00


Fermi-LAT SED high


All in a SED

This plot show the same 3 SED but in one plot


Fermi-LAT SED high


Sanity checks

I ran a Fermi-LAT analysis in each block to see differences within each block


Fermi-LAT SED high
Fermi-LAT SED mid
Fermi-LAT SED low


Fermi-LAT analysis on the LST GTI

The Fermi-LAT pipeline allow to run an analysis based on pre-defined GTI. This has been done using the LST observation time. For this the December and January data set were separated since they correspond to 2 different flux states.

GTI correspond to the LST observation time after data selection, plus or minus 1 hour

December

  • GTI definition :


723873640.4679999 723885814.544
723961205.0 723972636.3690003
724045627.3670001 724058152.8549998
724131722.0 724143939.893
724218276.9149997 724231900.1550002
724304640.2630002 724318201.9809997
724390555.44 724404422.1790001
724477321.222 724491352.339
724563718.779 724577641.8430002
724650067.315 724663888.9659998
  • results


The spectrum is best described by a logparabola with a TS = 8

Decorrelation energy : 6.36e+02 MeV
TS :  485.58040012843094
norm :  319.83 +/-  42.96 [ -37.51, + 0.00 ] 1e-12
alpha :  1.47 +/-  0.14 [ -0.15, + 0.14 ] 1e+00
beta :  0.15 +/-  0.06 [ -0.06, + 0.07 ] 1e+00
Eb :  631.00   1e+00