OP313 Dec2023 Jan2024 LST1 analysis details
Contents
LST analysis OP313 Dec 2023 and Jan 2024
Wiki page with general information on all results for the paper: December_January_paper
LST-1 analyzers:
- Seiya Nozaki (MPP)
- Jorge Otero-Santos (IAA-CSIC)
- Mireia Nievas-Rosillo (IAC)
- Daniel Morcuende (IAA-CSIC)
Data-taking information
- NSB level: all data was taken in dark NSB conditions
- Zenith angles: 15-54 deg (December 2023 data have zenith angle > 30 deg)
Good-quality selected dataset
The list of data runs below was obtained using the notebook https://github.com/cta-observatory/cta-lstchain/blob/main/notebooks/data_quality.ipynb.
We used default settings, but min_drdi_at_422pe = 1.2
instead of the default 1.5 to recover 1.7 h from January 2024 where low statistics limit us. Still, the data selected have a relative light yield above ~80%.
Also, short data runs (< 5 min) were excluded, because usually short runs are a symptom of problems during data acquisition.
'2023-12-09': [15942, 15943, 15944, 15945], '2023-12-10': [15975, 15976, 15977, 15978], '2023-12-11': [16007, 16008, 16009, 16010], '2023-12-12': [16042, 16043, 16044, 16045], '2023-12-13': [16079, 16080, 16081, 16082, 16083], '2023-12-14': [16114, 16116, 16117, 16118, 16119], '2023-12-15': [16150, 16151, 16152, 16153, 16154, 16155, 16156], '2023-12-16': [16188, 16189, 16191, 16192, 16193], '2023-12-17': [16220, 16221, 16222, 16223, 16224, 16225], '2023-12-18': [16240, 16241, 16242, 16243, 16244, 16246], '2024-01-09': [16293, 16294, 16295], '2024-01-13': [16350, 16351, 16352, 16353, 16354, 16356, 16357, 16358, 16359], '2024-01-17': [16391, 16392], '2024-01-19': [16412, 16413, 16414, 16415], '2024-01-21': [16418, 16419, 16420]
In total, there are 19.8 hours effective time.
- Relative light yield of the selected data:
lstchain settings
- lstchain version: v0.10.7
- MC production: 20230901_v0.10.4_allsky_base_prod
- RF models: /fefs/aswg/data/models/AllSky/20230901_v0.10.4_allsky_base_prod/dec_3476/
- DL2 MC for IRF calculation: /fefs/aswg/data/mc/DL2/AllSky/20230901_v0.10.4_allsky_base_prod/TestingDataset/dec_3476
- Used IRF interpolation
- Energy threshold: ~ 40 GeV
- Selection cuts IRF and DL3: 70% efficiency in both gammaness and theta gamma-ray selection cuts. Intensity > 50 p.e.
Gammapy settings
- Gammapy version: v1.1
- Energy binning:
reco energy axis: 5 GeV - 10 TeV, 5 bins per decade true energy axis: 1 GeV - 20 TeV, 10 bins per decade
- 3 off positions for SED and LC calculation
- Safe mask: 5% of max. Aeff
- Energy range for spectral fitting: 70 GeV - 1 TeV
- EBL model: Saldaña-Lopez 2021
Analysis cross-check
Cross-checks of different LST-1 analysis results.
Analyzer | Analysis method | Spectral model | Index | Amplitude [TeV-1 s-1 cm-2] | E_ref [GeV] | alpha_norm |
---|---|---|---|---|---|---|
Seiya | source-dependent | PWL+EBL | 2.37 +/- 0.88 | (0.82 +/- 0.14)e-08 | 100 | 1.0 |
Jorge | source-independent | PWL+EBL | 2.07 +/- 0.51 | (1.15 +/- 0.13)e-08 | 100 | 1.0 |
Mireia | source-independent | PWL+EBL | 1.86 +/- 0.50 | (0.93 +/- 0.11)e-08 | 100 | 1.0 |
Daniel | source-independent | PWL+EBL | 2.00 +/- 0.45 | (1.14 +/- 0.13)e-08 | 100 | 1.0 |
Go back to wiki page with general information on all results for the paper