PG1553+113 Preliminary Analysis with lstchain v0.7.x Priyadarshi

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PG1553+113 Preliminary Analysis with lstchain v0.7.x Priyadarshi

General information

  • Name of the source: PG 1553+113
  • Brief description of the source:
    • Object type : AGN
    • Redshift (z) : 0.433 Dorigo Jones et al
    • BL Lac
    • RA: 15 5543.044 (hh mm ss), Dec: +11 11 24.365 (dd mm ss)
    • RA, Dec in deg (ICRS): 238.92934976, 11.19010155
  • Analysis by Chaitanya Priyadarshi (IFAE - cpriyadarshi@ifae.es)

Data-taking information

  • Dates of data-taking: 20210321, 20210407, 20210408, 20210410, 20210420, 20210508, 20210604, 20210605, 20210606, 20210609
    • 20210321 (0.31 h)
      • ZD range (deg): [39.76]
      • AZ range (deg): [108.39]
      • Runs: 4207
      • Joint observations with MAGIC? : Yes
    • 20210407 (1.11 h)
      • ZD range (deg): [18.42, 26.43]
      • AZ range (deg): [197.5, 231.14]
      • Runs: 4333 - 4336
      • Joint observations with MAGIC? : No
    • 20210408 (0.43 h)
      • ZD range (deg): [17.71, 18.46]
      • AZ range (deg): [183.62, 198.43]
      • Runs: 4343, 4344
      • Joint observations with MAGIC? : No
    • 20210410 (1.96 h)
      • ZD range (deg): [17.48, 48.84]
      • AZ range (deg): [100.79, 190.59]
      • Runs: 4363 - 4370
      • Joint observations with MAGIC? : No
    • 20210420 (0.29 h)
      • ZD range (deg): [20.15, 22.06]
      • AZ range (deg): [211.01, 219.81]
      • Runs: 4514, 4515
      • Joint observations with MAGIC? : No
    • 20210508 (0.83 h)
      • ZD range (deg): [34, 42.45]
      • AZ range (deg): [105.21, 114.84]
      • Runs: 4652 - 4654
      • Joint observations with MAGIC? : Yes
    • 20210604 (0.88 h)
      • ZD range (deg): [18.8, 24.67]
      • AZ range (deg): [131.9, 162.59]
      • Runs: 4902 - 4905
      • Joint observations with MAGIC? : No
    • 20210605 (0.79 h)
      • ZD range (deg): [33.95, 41.33]
      • AZ range (deg): [245.96, 253.11]
      • Runs: 4930 - 4932
      • Joint observations with MAGIC? : Yes
    • 20210606 (1.28 h)
      • ZD range (deg): [18.21, 27.27]
      • AZ range (deg): [125.81, 172.56]
      • Runs: 4940 - 4943
      • Joint observations with MAGIC? : No
    • 20210609 (0.89 h)
      • ZD range (deg): [19.11, 28.35]
      • AZ range (deg): [123.68, 139.46]
      • Runs: 4987 - 4989
      • Joint observations with MAGIC? : No

Monte Carlo information

For energy-dependent cuts

  • 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]

For global cuts

  • Link to MC DL2 files used:

/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/{particle}/zenith_20deg/south_pointing/20210416_v0.7.3_prod5_trans_80_local_taicut_8_4/

    • Particle types: point-gamma (offset=0.4 deg), proton, electron
    • ZD (deg): [20]
    • AZ (deg): [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/DL1/20210319/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

For energy-dependent cuts

Information about your DL3 data selection.

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

For global cuts

Information about your DL3 data selection.

  • intensity > 0
  • r: [0, 1]
  • wl: [0.01, 1]
  • leakage_intensity_width_2: [0, 1]
  • source-indep
    • global_gh_cut: 0.7
    • global_theta_cut: 0.2


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 8.69 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, Power Law
  • Reference energy used by calculating the decorrelation energy with a Power Law fit, ~86 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

For energy-dependent cuts

Preliminary LC and SED, for the full dataset-

  • With Log Parabola model

LC Run 4207 4989 lp model e ref 86GeV fit 30GeV 100TeV.png SED Run 4207 4989 lp model e ref 86GeV fit range w 5 bin p decade 10 40.png

  • With Power Law model

LC Run 4207 4989 pl model e ref 86GeV fit 30GeV 100TeV.png SED Run 4207 4989 pl model e ref 86GeV fit range w 5 bin p decade 10 40.png

For global cuts

  • With Power Law model

Model parameters Run 4207 4989 pl model e ref 150GeV fit range w 5 bin p decade 10GeV 40TeV.png

LC Run 4207 4989 pl model e ref 150GeV fit 100GeV 100TeV.png SED Run 4207 4989 pl model e ref 150GeV fit range w 5 bin p decade 10GeV 40TeV.png