Analysis April 2022 with lstchain v0.9.X Pirola (cross-check)

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Relevant Analysis Name

General information

  • Name of the source: LHAASO J2108+5157
  • Brief description of the source:
- Object type : Unidentified Galactic PeVatron candidate
- Distance (pc) : Unknown
- RA, Dec in deg (ICRS): 317.22, 51.95
  • Analysis by Giorgio Pirola (MPP, gpirola@mpp.mgp.de)

Data-taking information (Run selection)

  • Run selection with the use of the notebook from Abelardo Moralejo [1]
  • Atmospheric transmission extracted from ELOG
  • The analysis has been performed on 2 samples, with different limits on the Zenith range:
- Zenith < 45 deg
- Zenith < 55 deg (in agreement with the primary analysis by Jakub Jurysek)
  • Summary of selection cuts:
- Wobble in (0.45, 0.55)deg
- elapsed_time > 5 min
- transmission_cut > 0.65
- pedestal charge std dev < 1.8 p.e.
- Cosmic rate > 3000 ev/s
- Cosmic rate( > 10 p.e.) > 20 ev/s
- Cosmic rate( > 30 p.e.) > 3 ev/s
- muon ring width std dev < 0.023
  • Run selection after cuts:
- Zenith < 45 deg:
 Total wobble runs: 162
 Observation time: 47.16 hours
 Selected Runs:
 1 : 2021-06-04 : [4913, 4914, 4915, 4916, 4917]
 2 : 2021-06-05 : [4935, 4936]
 3 : 2021-06-12 : [5028, 5029, 5030, 5031]
 4 : 2021-06-30 : [5072]
 5 : 2021-07-01 : [5082, 5083, 5084]
 6 : 2021-07-02 : [5091, 5092, 5093]
 7 : 2021-07-03 : [5101, 5102, 5103, 5104, 5105, 5106, 5107, 5108]
 8 : 2021-07-04 : [5118, 5119, 5120, 5121]
 9 : 2021-07-05 : [5138, 5139, 5140, 5141, 5142]
 10 : 2021-07-15 : [5270, 5272]
 11 : 2021-08-01 : [5440, 5441, 5442]
 12 : 2021-08-03 : [5461, 5462, 5463, 5464, 5465]
 13 : 2021-08-04 : [5473, 5474, 5475, 5476, 5477, 5478, 5479, 5480]
 14 : 2021-08-05 : [5491, 5492, 5493, 5494, 5497, 5498, 5499, 5500]
 15 : 2021-08-06 : [5505, 5506, 5507, 5508, 5509, 5510, 5511, 5512, 5513, 5514, 5515, 5516, 5517]
 16 : 2021-08-08 : [5576]
 17 : 2021-08-09 : [5590, 5591]
 18 : 2021-08-10 : [5641, 5642, 5643]
 19 : 2021-08-11 : [5681, 5682, 5683, 5684, 5685, 5686, 5687]
 20 : 2021-08-12 : [5707, 5708, 5709, 5710, 5711, 5712, 5713]
 21 : 2021-08-13 : [5727]
 22 : 2021-09-01 : [5947, 5948, 5949, 5950, 5952]
 23 : 2021-09-02 : [5980, 5981, 5982, 5983, 5984, 5985, 5986, 5987, 5988]
 24 : 2021-09-03 : [5999, 6000, 6001, 6002, 6003, 6004, 6005, 6006, 6007, 6008, 6009]
 25 : 2021-09-04 : [6023, 6024, 6034, 6035, 6036, 6037, 6038]
 26 : 2021-09-05 : [6057, 6058, 6059, 6060, 6061, 6062, 6063, 6064, 6065, 6066]
 27 : 2021-09-06 : [6079, 6080, 6082, 6083, 6084, 6085]
 28 : 2021-09-07 : [6130, 6131, 6132, 6133, 6134]
 29 : 2021-09-09 : [6175, 6176, 6177, 6178, 6179, 6180, 6181, 6182, 6183]
 30 : 2021-09-11 : [6230, 6231]
 31 : 2021-09-12 : [6254, 6255, 6256]
- Zenith < 55 deg:
 Total wobble runs: 177
 Observation time: 51.40 hours
 Selected Runs:
 1 : 2021-06-04 : [4913, 4914, 4915, 4916, 4917]
 2 : 2021-06-05 : [4935, 4936]
 3 : 2021-06-12 : [5028, 5029, 5030, 5031]
 4 : 2021-06-30 : [5071, 5072]
 5 : 2021-07-01 : [5080, 5081, 5082, 5083, 5084]
 6 : 2021-07-02 : [5091, 5092, 5093]
 7 : 2021-07-03 : [5101, 5102, 5103, 5104, 5105, 5106, 5107, 5108]
 8 : 2021-07-04 : [5115, 5116, 5117, 5118, 5119, 5120, 5121]
 9 : 2021-07-05 : [5135, 5136, 5137, 5138, 5139, 5140, 5141, 5142]
 10 : 2021-07-15 : [5270, 5272]
 11 : 2021-08-01 : [5440, 5441, 5442]
 12 : 2021-08-03 : [5461, 5462, 5463, 5464, 5465]
 13 : 2021-08-04 : [5473, 5474, 5475, 5476, 5477, 5478, 5479, 5480]
 14 : 2021-08-05 : [5491, 5492, 5493, 5494, 5497, 5498, 5499, 5500]
 15 : 2021-08-06 : [5505, 5506, 5507, 5508, 5509, 5510, 5511, 5512, 5513, 5514, 5515, 5516, 5517]
 16 : 2021-08-08 : [5576]
 17 : 2021-08-09 : [5590, 5591]
 18 : 2021-08-10 : [5641, 5642, 5643]
 19 : 2021-08-11 : [5681, 5682, 5683, 5684, 5685, 5686, 5687]
 20 : 2021-08-12 : [5707, 5708, 5709, 5710, 5711, 5712, 5713]
 21 : 2021-08-13 : [5727]
 22 : 2021-09-01 : [5947, 5948, 5949, 5950, 5952]
 23 : 2021-09-02 : [5980, 5981, 5982, 5983, 5984, 5985, 5986, 5987, 5988, 5989, 5990, 5991]
 24 : 2021-09-03 : [5999, 6000, 6001, 6002, 6003, 6004, 6005, 6006, 6007, 6008, 6009, 6010]
 25 : 2021-09-04 : [6023, 6024, 6034, 6035, 6036, 6037, 6038]
 26 : 2021-09-05 : [6057, 6058, 6059, 6060, 6061, 6062, 6063, 6064, 6065, 6066]
 27 : 2021-09-06 : [6079, 6080, 6082, 6083, 6084, 6085]
 28 : 2021-09-07 : [6130, 6131, 6132, 6133, 6134]
 29 : 2021-09-09 : [6175, 6176, 6177, 6178, 6179, 6180, 6181, 6182, 6183]
 30 : 2021-09-11 : [6230, 6231, 6233]
 31 : 2021-09-12 : [6254, 6255, 6256, 6257]

Monte Carlo information

- 20200629_prod5_trans_80
- 20, 40 deg zenith angle, south-pointing
- Note: 20 deg zenith angle MC was tuned manually using lstchain scripts, while for 40 deg MC we used lstmcpipe production [2] and thus the directory structure for the two is different
  • PSF and NSB tuned:
"image_modifier": {
      "increase_nsb": true,
      "extra_noise_in_dim_pixels": 0.705,
      "extra_bias_in_dim_pixels": 0.269,
      "transition_charge": 8,
      "extra_noise_in_bright_pixels": 0.673,
      "increase_psf": true,
      "smeared_light_fraction": 0.125
      }
  • Tuned DL1b MC:
- 20 deg zenith angle:
/fefs/aswg/workspace/jakub.jurysek/simulations/dl1/20200629_prod5_trans_80/gamma/zenith_20deg/south_pointing/20220225_v0.9.1_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/off0.4deg/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl1/20200629_prod5_trans_80/gamma-diffuse/zenith_20deg/south_pointing/20220225_v0.9.1_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl1/20200629_prod5_trans_80/proton/zenith_20deg/south_pointing/20220225_v0.9.1_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl1/20200629_prod5_trans_80/electron/zenith_20deg/south_pointing/20220225_v0.9.1_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
- 40 deg zenith angle:
/fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/gamma/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/off0.4deg/
/fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/gamma-diffuse/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
/fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/electron/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
/fefs/aswg/data/mc/DL1/20200629_prod5_trans_80/proton/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
  • Random Forests - source independent:
- 20 deg zenith angle:
/fefs/aswg/workspace/jakub.jurysek/simulations/models/20200629_prod5_trans_80/zenith_20deg/south_pointing/20220225_v0.9.2_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
- 40 deg zenith angle:
/fefs/aswg/data/models/20200629_prod5_trans_80/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
  • DL2 MC (testing only):
- 20 deg zenith angle:
/fefs/aswg/workspace/jakub.jurysek/simulations/dl2/20200629_prod5_trans_80/gamma/zenith_20deg/south_pointing/20220225_v0.9.2_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/off0.4deg/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl2/20200629_prod5_trans_80/gamma-diffuse/zenith_20deg/south_pointing/20220225_v0.9.2_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl2/20200629_prod5_trans_80/proton/zenith_20deg/south_pointing/20220225_v0.9.2_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
/fefs/aswg/workspace/jakub.jurysek/simulations/dl2/20200629_prod5_trans_80/electron/zenith_20deg/south_pointing/20220225_v0.9.2_prod5_trans_80_dl1ab_tune_MC_to_LHAASO/
- 40 deg zenith angle:
/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/proton/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/gamma/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/off0.4deg/
/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/gamma-diffuse/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/
/fefs/aswg/data/mc/DL2/20200629_prod5_trans_80/electron/zenith_40deg/south_pointing/20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2/

DL1 data

  • DL1a files produced by LSTOSA (lstchain v0.9)
  • lstchain v0.9 tailcut8-4 (with cleaning based on pedestal RMS, dynamical cleaning)
  • cfg /fefs/aswg/data/real/DL1/{date}/v0.9/tailcut84/log/lstchain_config_tailcut84_v092.json
/fefs/aswg/data/real/DL1/{date}/v0.9/tailcut84/

DL2 data

  • data in range of zenith angles (0, 30) reconstructed with 20 deg RFs
  • data in range of zenith angles (30, 55) reconstructed with 40 deg RFs
 /fefs/aswg/workspace/giorgio.pirola/LST_analysis/lhaaso_pipe/data/DL2_config/{date}

IRFs

  • Full enclosure
  • IRF path: /fefs/aswg/workspace/giorgio.pirola/LST_analysis/lhaaso_pipe/data/mc/IRFs/fixed_cuts
  • Two different approaches:
- for the sample with up to 55deg Zenith, I used IRFs depending on the run mean zenith angle
 point source assumption
 irf_20deg_180deg_off0.4deg_20220225_v0.9.1_prod5_trans_80_dl2ab_tune_MC_to_LHAASO_fixed_cuts_gh75_theta005.fits.gz (mean Zenith angle <30deg)
 irf_40deg_180deg_off0.4deg_20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2_fixed_cuts_gh75_theta005.fits.gz (mean Zenith angle >30deg)
 extended source assumption
 irf_20deg_180deg_off0.4deg_20220225_v0.9.1_prod5_trans_80_dl2ab_tune_MC_to_LHAASO_fixed_cuts_gh75_theta026.fits.gz (mean Zenith angle <30deg)
 irf_40deg_180deg_off0.4deg_20220308_v0.9.3_prod5_trans_80_zen40az180_dl1ab_tuned_nsb_psf_src2_fixed_cuts_gh75_theta026.fits.gz (mean Zenith angle >30deg)

Lhaaso aeff extended giorgio.png

- for the sample with up to 45deg Zenith, I interpolated the effective area using pyirf, according to the run mean zenith angle ('linear' for values included in the 20-40 deg range, otherwise 'closest')

Lhaaso aeff interpolation giorgio.png

DL3 data selection

  • Fixed cuts:
"intensity": [50, Infinity],
"width": [0, Infinity],
"length": [0, Infinity],
"r": [0, 1],
"wl": [0.1, 1],
"leakage_intensity_width_2": [0, 1.0],
"event_type": [32, 32]
  • Global gammaness and theta2 cuts optimized on Crab detection significance (see: )
 global_gh_cut: 0.75
-Point-like source assumption:
 global_theta_cut: 0.2236067 (0.05 deg^2)
-Extended source assumption (95% UL on extension from the LHAASO paper [3] used)
 global_theta_cut: 0.26 (~0.07 deg^2)

High-level analysis

  • Performed with gammapy-v0.19

1D Spectral analysis

bkg_maker = ReflectedRegionsBackgroundMaker(exclusion_mask=exclusion_mask,
                                           min_distance=1 * u.rad,
                                           max_region_number=2
                                          )
safe_mask_masker = SafeMaskMaker(methods=["aeff-max"], aeff_percent=10)

energy_axis = MapAxis.from_energy_bounds(
   0.1, 100, nbin=2, per_decade=True, unit="TeV", name="energy"
)
energy_axis_true = MapAxis.from_energy_bounds(
   0.01, 100, nbin=5, per_decade=True, unit="TeV", name="energy_true"
)
  • Spectral fitting of stacked LST dataset
  • Performed for point-like and extended source assumption
  • LST-1 data alone: Power-law spectral model
  • Joint likelihood forward folding with LHAASO SED data points: Exponential cutoff power-law spectral model

Zenith<55deg:

Zenith<45deg (run-wise interpolated effective areas):

Analysis Results

Zenith<55deg

Power-law model of LST-1 data

Point-like Lhaaso table pl.png

Lhaaso plot pl.png

Extended Lhaaso table pl extended.png

Lhaaso plot pl extended.png

Joint likelihood forward folding with LHAASO flux points

Point-like

Lhaaso plot joint.png

Extended

Lhaaso plot joint extended.png

Zenith<45deg (run-wise interpolated effective areas)

Power-law model of LST-1 data

Point-like Lhaaso table pl int.png

Lhaaso plot pl int.png

Extended Lhaaso table pl extended int.png

Lhaaso plot pl extended int.png

Joint likelihood forward folding with LHAASO flux points

Point-like Lhaaso table joint int.png

Lhaaso plot joint int.png

Extended Lhaaso table joint extended int.png

Lhaaso plot joint extended int.png

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