PKS1424 LST1 analysis Cycle I DanielMorcuende

Analysis of LST-1 PKS 1424+240 data from observation cycle I

General information

• Name of the source: PKS 1424+240
• Brief description of the source:
  • Object type : blazar, HBL object
  • Detected in VHE, TeVCat: http://tevcat.uchicago.edu/?mode=1;id=184
  • Redshift (z) : uncertain, current limits place it in the range z = 0.24 - 1.19 (see several works references in TeVCat)
  • Other relevant information: potential neutrino emitter found by IceCube (https://doi.org/10.1126/science.abg3395)
  • RA, Dec in deg (ICRS): 216.75163247, 23.80001042

• Analysis by Name (Institute - email)
  • Daniel Morcuende (IAA-CSIC, dmorcuende@iaa.es)
  • José Manuel Gavilán (IAA-CSIC)

Data-taking information

Cycle I observations 2023-01-23 to 2023-07-17

• Dates of data-taking:
  • Date (time of observation h)
    • ZD range (deg):

Dataset after good quality selection

Number of runs (% is w.r.t. those in Sky region & zenith range): 

    In the requested Sky region and range of dates:	 35
  + zenith in requested range:				 35
  + NSB in requested range:				 32 (91.4%) 

  + FF and pedestal interleaved events are present:	 32 (91.4%)
  + Stable pointing:					 32 (91.4%)
  + dR/dI fit P-value ok:				 32 (91.4%)
  + dR/dI LS periodogram ok:				 30 (85.7%)
  + dR/dI index ok:					 29 (82.9%)
  + dR/dI rate ok:					 20 (57.1%)
  + intensity threshold ok:				 20 (57.1%)
Total observation time: 5.47 h (20 runs)

Total number of runs: 20 (in 5 nights)
Total observation time: 5.47 hours

'2023-01-23': [11805, 11806, 11807, 11808],
'2023-01-27': [11933, 11934, 11935, 11936, 11937, 11938],
'2023-04-18': [12747, 12748, 12749, 12750],
'2023-05-12': [12957, 12958, 12959, 12960, 12961],
'2024-03-10': [17029],

File:Pk1424 LST1 rel light yield cycle I dmorcuende.png

Analysis information

• lstchain v0.10
• source-independent analysis
• Gammapy v1.1

Monte Carlo information

Closest declination line towards La Palma latitude (28.8 deg)

20240131_allsky_v0.10.5_all_dec_base/?

DL1 data

Standard DL1b files produced by LSTOSA (lstchain v0.10, tailcut 8-4 with cleaning based on pedestal RMS, dynamic cleaning)

/fefs/aswg/data/real/DL1/YYYYMMDD/v0.10/tailcut84/dl1_LST-1.Run?????.h5

Random forest

Models:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/?

DL2

Files:

/fefs/aswg/workspace/daniel.morcuende/data/real/DL2/PKS1424

IRF and DL3 data selection

DL3 files:

/fefs/aswg/workspace/daniel.morcuende/data/real/DL3/NGC1068/20240131_allsky_v0.10.5_all_dec_base/dec_931/gh_eff_0.7_th_cont_0.7

• IRF linear interpolation
• intensity > 50 p.e.
• gammaness energy-dependent cuts with 70% efficiency
• theta energy-dependent cuts 70% efficiency

High-level analysis

• Science Tool: Gammapy 1.1
• point-like IRF, 1D analysis

Analysis Results

Theta2 plot

Theta2 plots (Effective time: 5.185 h; Elapsed time: 5.463 h)

No detection

Energy range: 0.0 - 0.2 TeV
Excess: -534.0; Off: 177283
Gamma rate: -1.7 events / minute
Off rate: 569.9 events / minute
alpha (backg normalization): 1.00
Li & Ma Significance: 0.0 standard deviations

File:Pks1424 LST1 theta2 HE cycle I dmorcuende.png

Energy range: 0.2 - 1000000.0 TeV
Excess: 9.3; Off: 380
Gamma rate: 0.0 events / minute
Off rate: 1.2 events / minute
alpha (backg normalization): 0.33
Li & Ma Significance: 0.7 standard deviations

Spectral results

• Fermi-LAT 3FHL and 3FGL SED shown.
  • Spectral model plotted corresponds to the Fermi-LAT data, extended to VHE.