Mrk 421 Preliminary Analysis with lstchain v0.7.x Priyadarshi

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Mrk 421 Preliminary Analysis with lstchain v0.7.x Priyadarshi

General information

  • Name of the source: Mrk 421
  • Brief description of the source:
    • Object type : AGN
    • Redshift (z) : 0.0308
    • HBL
    • RA: 11 04 27.314 (hh mm ss), Dec: +38 12 31.8 (dd mm ss)
    • RA, Dec in deg (ICRS): 166.113808
  • Analysis by Chaitanya Priyadarshi (IFAE - cpriyadarshi@ifae.es)

Data-taking information

  • Dates of data-taking: 20201212, 202201213, 20201214, 20210212, 20210213, 20210214, 20210215, 20210216, 20210217, 20210219, 20210303, 20210310, 20210313, 20210316, 20210317, 20210318, 20210320, 20210321, 20210412, 20210416, 20210417, 20210418, 20210430, 20210505, 20210508, 20210509, 20210511, 20210531, 20210601, 20210606, 20210608
    • 20201212 (3.07 h)
      • ZD range (deg): [11.2, 52.1]
      • AZ range (deg): [34.68, 64.37]
      • Runs: 3216 - 3227
      • Joint observations with MAGIC? : Not for 3219 and 3220
    • 20201213 (0.7 h)
      • ZD range (deg): [10.16, 13.4]
      • AZ range (deg): [20.97, 42.6]
      • Runs: 3238, 3239
      • Joint observations with MAGIC? : Yes
    • 20201214 (1.25 h)
      • ZD range (deg): [11.25, 22.41]
      • AZ range (deg): [31.59, 57.87]
      • Runs: 3247 - 3250
      • Joint observations with MAGIC? : Yes
    • 20210212 (2.15 h)
      • ZD range (deg): [19.4, 45.78]
      • AZ range (deg): [-64.84, -55.85]
      • Runs: 3617 - 3624
      • Joint observations with MAGIC? : No
    • 20210213 (1.07 h)
      • ZD range (deg): [27.45, 45.24]
      • AZ range (deg): [-64.58, -61.95]
      • Runs: 3641, 3642, 3644, 3645, 3646
      • Joint observations with MAGIC? : No
    • 20210214 (2.42 h)
      • ZD range (deg): [14.38, 42.66]
      • AZ range (deg): [-64.31, -44.05]
      • Runs: 3661 - 3668
      • Joint observations with MAGIC? : No
    • 20210215 (0.62 h)
      • ZD range (deg): [9.44, 10.42]
      • AZ range (deg): [-5.43, 24.23]
      • Runs: 3687, 3688
      • Joint observations with MAGIC? : No
    • 20210216 (1.81 h)
      • ZD range (deg): [21.56, 48.6]
      • AZ range (deg): [-64.41, -58.23]
      • Runs: 3715 - 3721
      • Joint observations with MAGIC? : No
    • 20210217 (1.59 h)
      • ZD range (deg): [9.11, 14.3]
      • AZ range (deg): [-45.62, 40.88]
      • Runs: 3732 - 3737
      • Joint observations with MAGIC? : No
    • 20210219 (0.07 h)
      • ZD range (deg): [51.35]
      • AZ range (deg): [-62.46]
      • Runs: 3800
      • Joint observations with MAGIC? : No
    • 20210313 (0.77 h)
      • ZD range (deg): [27.71, 37.26]
      • AZ range (deg): [-64.51, -62.07]
      • Runs: 4016 - 4019
      • Joint observations with MAGIC? : No
    • 20210316 (1.26 h)
      • ZD range (deg): [12.55, 24.53]
      • AZ range (deg): [-61.46, -39.1]
      • Runs: 4097 - 4100
      • Joint observations with MAGIC? : No
    • 20210317 (2.56 h)
      • ZD range (deg): [12.82, 44.27]
      • AZ range (deg): [-64.14, -40.23]
      • Runs: 4131 - 4138
      • Joint observations with MAGIC? : No
    • 20210318 (1.28 h)
      • ZD range (deg): [33.49, 47.24]
      • AZ range (deg): [-63.86, -63.18]
      • Runs: 4153 - 4156
      • Joint observations with MAGIC? : No
    • 20210320 (1.44 h)
      • ZD range (deg): [24.68, 43.9]
      • AZ range (deg): [-64.41, -60.53]
      • Runs: 4184 - 4188
      • Joint observations with MAGIC? : No
    • 20210321 (0.31 h)
      • ZD range (deg): [40.09]
      • AZ range (deg): [-63.82]
      • Runs: 4208
      • Joint observations with MAGIC? : No
    • 20210412 (0.55 h)
      • ZD range (deg): [52.74, 62.03]
      • AZ range (deg): [-62.18, -59.17]
      • Runs: 4441 - 4443
      • Joint observations with MAGIC? : Yes
    • 20210417 (0.96 h)
      • ZD range (deg): [9.78, 12.51]
      • AZ range (deg): [-9.47, 38.73]
      • Runs: 4457 - 4459
      • Joint observations with MAGIC? : No
    • 20210418 (0.31 h)
      • ZD range (deg): [32.75]
      • AZ range (deg): [-63.38]
      • Runs: 4479
      • Joint observations with MAGIC? : No
    • 20210430 (1.59 h)
      • ZD range (deg): [11.94, 32.75]
      • AZ range (deg): [-62.11, -35.77]
      • Runs: 4568 - 4572
      • Joint observations with MAGIC? : No
    • 20210505 (0.71 h)
      • ZD range (deg): [16.13, 23.12]
      • AZ range (deg): [-58.44, -50.43]
      • Runs: 4612 - 4614
      • Joint observations with MAGIC? : Yes
    • 20210508 (0.27 h)
      • ZD range (deg): [14.12]
      • AZ range (deg): [-45.14]
      • Runs: 4649
      • Joint observations with MAGIC? : Yes
    • 20210509 (1.59 h)
      • ZD range (deg): [15.27, 34.35]
      • AZ range (deg): [-63.6, -48.35]
      • Runs: 4667 - 4671
      • Joint observations with MAGIC? : No
    • 20210531 (0.3 h)
      • ZD range (deg): [41.6, 45.69]
      • AZ range (deg): [-63.77, -63.39]
      • Runs: 4852, 4853
      • Joint observations with MAGIC? : No
    • 20210601 (0.64 h)
      • ZD range (deg): [46.22, 53.68]
      • AZ range (deg): [-63.32, -61.95]
      • Runs: 4868, 4869
      • Joint observations with MAGIC? : No
    • 20210606 (0.32 h)
      • ZD range (deg): [37.16]
      • AZ range (deg): [-64.47]
      • Runs: 4939
      • Joint observations with MAGIC? : No
    • 20210608 (0.25 h)
      • ZD range (deg): [38.21]
      • AZ range (deg): [-63.78]
      • Runs: 4962
      • Joint observations with MAGIC? : Yes


Monte Carlo information

  • Link to MC DL2 files used:

/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/{particle}/zenith_20deg/south_pointing/20210923_v0.7.5_prod5_trans_80_dynamic_cleaning/ /fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/{particle}/zenith_40deg/south_pointing/20210506_v0.7.3_prod5_trans_80_zen40deg_local_tailcut_8_4/

    • Particle types: point-gamma (offset=0.4 deg), proton, electron
    • ZD (deg): [20, 40]
    • AZ (deg): [180, 180]

DL1 data

This includes whether you use LSTOSA, specific versions of lstchain, dllab scripts, cleaning levels, and calibration information.


DL1a files produced by LSTOSA (lstchain v0.7.1 and v0.7.3)

  • original real DL1a data
/fefs/aswg/data/real/DL1/{Date}/v0.7.{1,3}/tailcut84/


  • lstchain v0.7.1 tailcut8-4 (with cleaning based on pedestal RMS)
 /fefs/aswg/data/real/DL1/20201212/v0.7.1/log/lstchain_standard_config_tailcut84.json
  • lstchain v0.7.3 tailcut8-4 (with cleaning based on pedestal RMS), dynamic cleaning
 /fefs/aswg/data/real/DL1/20210320/v0.7.3/tailcut84/log/lstchain_standard_config_tailcut84.json
  • MC (zen 20 deg): tailcut8-4 (with cleaning based on pedestal RMS), dynamic cleaning
 /fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/proton/zenith_20deg/south_pointing/20210923_v0.7.5_prod5_trans_80_dynamic_cleaning/lstchain_standard_config_v075_Tel1_tail84_dynamic_clean.json
  • MC (zen 40 deg): tailcut8-4 (with cleaning based on pedestal RMS)
/fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/proton/zenith_40deg/south_pointing/20210506_v0.7.3_prod5_trans_80_zen40deg_local_tailcut_8_4/lstchain_standard_config_v073_Tel1_tail_8_4_MC_config.json

Random forest

  • lstchain v0.7.5 source-indep, zenith 20 deg, azimuth 180 deg, dynamic cleaning
 /fefs/aswg/data/models/20200629_prod5_trans_80/zenith_20deg/south_pointing/20210923_v0.7.5_prod5_trans_80_dynamic_cleaning/lstchain_standard_config_v075_Tel1_tail84_dynamic_clean.json
  • lstchain v0.7.3 source-indep, zenith 40 deg, azimuth 180 deg
 /fefs/aswg/data/models/20200629_prod5_trans_80/zenith_40deg/south_pointing/20210506_v0.7.3_prod5_trans_80_zen40deg_local_tailcut_8_4/lstchain_standard_config_v073_Tel1_tail_8_4_MC_config.json

DL2 data

Similar to DL1 files


DL3 data selection

Information about your DL3 data selection.

  • intensity > 0
  • r: [0, 1]
  • wl: [0.01, 1]
  • leakage_intensity_width_2: [0, 1]
  • source-indep, energy-dependent cuts
    • gh_efficiency: 0.8
    • theta_containment: 0.8

High-level analysis

  • lstchain Tools to generate source-independent IRF and DL3
  • Science Tool: gammapy 0.20.dev309+gb11005a (Developer build to extract signal from energy-dependent regions)
  • point-like IRF, 1D analysis

Gammaness cuts distribution 80% efficiency different MC pointing.png Theta cuts distribution 80% efficiency different MC pointing.png

Effective area 80% efficiency different MC pointing.png Energy dispersion 80% efficiency different MC pointing.png

A total of 24.5 hrs of data was analyzed

For DL3 data reduction to DL4 dataset,

  • OFF regions selected - 1 Wobble
  • Safe Energy mask for systematics - No
  • Energy axes -
    • True: 10 GeV to 100 TeV with 10 bins per decade
    • Reco: 10 GeV to 40 TeV with 5 bins per decade

For spectral analysis,

  • Model used - Log Parabola
  • Reference energy used by calculating the decorrelation energy with a Power Law fit, ~490 GeV
  • Spectral Fit energy range - 10 GeV to 40 TeV with 5 bins per decade
  • Spectral fit with gammapy default optimization - minuit

Analysis Results

Theta2 plot

Significance map

Excess map

Spectral results

Preliminary LC and SED, for the full dataset-

LC Run 2177 6078 lp model e ref 487GeV fit 300GeV 100TeV.png

SED Run 2177 6078 lp model e ref 487GeV fit range w 5 bin p decade 10 40.png

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