Fermi LAT Main OP313
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
Contents
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
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
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
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
All in a SED
This plot show the same 3 SED but in one plot
Sanity checks
I ran a Fermi-LAT analysis in each block to see differences within each block
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
Energy bins :
Energy (MeV) Emin (MeV) Emax (MeV) E**2. dN/dE (erg.cm-2s-1) GaussianError MinosNegativeError MinosPositiveError 194.87678426697477 100.0 379.7696104623707 9.319484501181774e-11 2.1543103572878036e-11 2.1543103572878036e-11 2.1543103572878036e-11 740.0828044922853 379.7696104623707 1442.2495703074076 2.2242267948656154e-10 3.740704450500723e-11 3.740704450500723e-11 3.740704450500723e-11 2810.60958371934 1442.2495703074076 5477.225575051662 2.5812348537462586e-10 6.3223341587809e-11 6.3223341587809e-11 6.3223341587809e-11 10673.841067708996 5477.225575051662 20800.838230519017 3.732781066915012e-10 1.418387773038279e-10 1.418387773038279e-10 1.418387773038279e-10 40536.00464421105 20800.838230519017 78995.26232095003 6.63379628561793e-10 0 0 0 153943.4269343286 78995.26232095003 300000.0 8.357587434248279e-10 0 0 0
January
- GTI definition :
726552297.6990001 726561947.6859998 726892290.0700003 726907611.6300001 727240316.6290002 727249629.2620002 727413535.0709997 727427037.5470002 727591996.0049999 727601886.3499998
The spectrum is best described by a PowerLaw
Decorrelation energy : 7.50e+02 MeV Diffential flux at the Decorrelation energy : 9.45e-11 +/- 3.38e-11 ph/cm2/s/MeV SED value at the Decorrelation energy : 8.51e-11 +/- 3.04e-11 erg/cm2/s TS : 35.69191921871675 Prefactor : 12.46 +/- 5.67 [ -4.97, + 6.36 ] 1e-12 Index : -1.92 +/- 0.27 [ -0.28, + 0.25 ] 1e+00 Scale : 2158.74 1e+00
Energy bins :
Energy (MeV) Emin (MeV) Emax (MeV) E**2. dN/dE (erg.cm-2s-1) GaussianError MinosNegativeError MinosPositiveError 194.87678426697477 100.0 379.7696104623707 8.633107975744825e-11 0 0 0 740.0828044922853 379.7696104623707 1442.2495703074076 1.460440435930128e-10 6.190196350297941e-11 6.190196350297941e-11 6.190196350297941e-11 2810.60958371934 1442.2495703074076 5477.225575051662 1.6577500394312136e-10 1.0205468393089642e-10 1.0205468393089642e-10 1.0205468393089642e-10 10673.841067708996 5477.225575051662 20800.838230519017 2.8424561022011924e-10 0 0 0 40536.00464421105 20800.838230519017 78995.26232095003 1.0610616799876391e-09 0 0 0 153943.4269343286 78995.26232095003 300000.0 4.074288665502138e-09 0 0 0
Fermi-LAT analysis on the MAGIC GTI
December
- GTI definition :
723873738.9638007 723886116.7592399 723959842.0563712 723972624.2676063 724048522.9209478 724059356.7475426 724306288.9017658 724315124.9729121 724393554.9572983 724405332.7793977 724478343.1023378 724491622.7682776 724564582.8709738 724577855.7759162 724651134.921248 724664669.7927337
- results
