SN2024bch

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General Information

  • Name of the source: SN2024bch
  • Brief description of the source:
    • Object type: CCSN type II-P/II-n
    • Distance (Mpc): 16.45
    • Redshift: 0.003839
    • Host galaxy: NGC 3206
    • RA: 10:21:49.740 (hh mm ss), Dec: +56:55:40.51 (dd mm ss)
    • RA, Dec in deg (ICRS): 155.45725, +56.927919


People involved

Alphabetical order (corresponding authors)

  • Arnau Aguasca-Cabot
  • Alessandro Carosi
  • Alicia López-Oramas
  • Andrea Simongini (andrea.simongini@inaf.it)

Presentations

Data-taking Information

  • General information:
    • Start observation date: 2024-02-13
    • Total nights: 6
    • Total hours: 14.6
    • Total runs: 53
  • Observation condition: moon and dark
  • Observation mode: wobbles
  • Joint observations with MAGIC?: yes (16845-16863)
  • Joint analysis with MAGIC?: no


SN2024bch observations with LST-1
Run Number Night Run Start Time [UTC] Run Elapsed Time [min] Mean pointing zenith [deg] Wobble Position Used in stacked analysis Conditions ELOG
16771 20240213 00:29 20 32.6 W1 True dark 20240213
16772 20240213 00:49 19 30.5 W2 True dark 20240213
16773 20240213 01:08 24 29.9 W3 True dark 20240213
16774 20240213 01:32 17 28.1 W4 True dark 20240213
16775 20240213 01:49 20 xx W1 True dark 20240213
16776 20240213 02:09 20 xx W2 True dark 20240213
16777 20240213 02:29 20 28.9 W3 True dark 20240213
16778 20240213 02:49 20 xx W4 True dark 20240213
16779 20240213 03:09 22 30.3 W1 True dark 20240213
16780 20240213 03:31 19 32.5 W2 True dark 20240213
16781 20240213 03:50 17 34.3 W3 True dark 20240213
16803 20240214 01:11 26 29.3 W1 True dark 20240214
16804 20240214 01:37 18 28 W2 True dark 20240214
16805 20240214 01:55 15 28.5 W3 True dark 20240214
16806 20240214 02:10 20 27.8 W4 True dark 20240214
16807 20240214 02:30 23 28.5 W1 True dark 20240214
16808 20240214 02:53 18 30 W2 True dark 20240214
16809 20240214 03:11 20 31.4 W3 True dark 20240214
16810 20240214 03:31 21 32.3 W4 True dark 20240214
16811 20240214 03:52 4 34.4 W1 True dark 20240214
16815 20240215 00:14 16 33.3 W1 False dark 20240215
16816 20240215 00:30 20 31.4 W2 False dark 20240215
16817 20240215 00:50 21 30.5 W3 False dark 20240215
16818 20240215 01:11 21 28.7 W4 True dark 20240215
16819 20240215 01:32 18 28.3 W1 True dark 20240215
16820 20240215 01:50 20 28 W2 True dark 20240215
16821 20240215 02:10 22 28.6 W3 True dark 20240215
16822 20240215 02:32 19 28.5 W4 True dark 20240215
16823 20240215 02:51 19 29.7 W1 True dark 20240215
16824 20240215 03:10 22 31.9 W2 True dark 20240215
16825 20240215 03:32 18 33.4 W3 True dark 20240215
16826 20240215 03:50 12 34.6 W4 True dark 20240215
16845 20240216 01:02 21 29.4 W1 False dark 20240216
16846 20240216 01:23 20 28.3 W2 False dark 20240216
16847 20240216 01:43 22 28 W3 False dark 20240216
16848 20240216 02:05 19 27.8 W4 False dark 20240216
16849 20240216 02:24 21 28.6 W1 True dark 20240216
16850 20240216 02:45 20 29.9 W2 True dark 20240216
16851 20240216 03:05 21 31.4 W3 True dark 20240216
16852 20240216 03:26 20 32.5 W2 True dark 20240216
16853 20240216 03:46 14 34.5 W3 True dark 20240216
16863 20240218 03:10 19 32 W1 False moon 20240218
16864 20240218 03:29 18 34.7 W2 False moon 20240218
16866 20240218 03:47 19 36.1 W2 False moon 20240218
16867 20240218 04:06 28 38.1 W3 False moon 20240218
16868 20240218 04:25 3 xx xx False moon 20240218
16869 20240218 04:34 19 41.1 W4 True moon 20240218
16870 20240218 04:53 7 43.4 W1 True moon 20240218
16980 20240306 00:15 20 28 W1 True dark 20240306
16981 20240306 00:35 20 28 W2 True dark 20240306
16982 20240306 00:55 20 28.7 W3 True dark 20240306
16983 20240306 01:15 20 28.7 W4 True dark 20240306
16984 20240306 01:35 8 30 W1 True dark 20240306


Data quality cuts

We performed a standard source independent analysis for this source. The data quality is performed using the data_quality.ipynb notebook from the 2024-LST-School.

  • Source selection:
    • zenith_range = [0, 90]
    • min_angle_to_source = 0.35
    • max_angle_to_source = 0.45
  • Global cuts:
    • max_diffuse_nsb_std = 2.3
    • max_pointing_dec_std = 0.01
    • min_mean_fit_p = -3.
    • max_LS_periodogram_maxamplitude = 1e-2
    • min_drdi_index = -2.35
    • max_drdi_index = -2.1
    • min_drdi_at_422pe = 1.4
    • min_fraction_around_mode = 0.8
    • max_intensity_at_half_peak_rate = 70
  • Data quality plots:

Quality cuts.png

  • Relative light yield of the selected nights:

Light yield SN2024bch.png

  • Results:
    • Good quality runs: 41/53(77%)
    • Total time: 12.1 h
  • Extra notes:
    • 16868 is a very short run (3.4939323 min) due to data taking interruption by shifters
    • 16815 16816 16817 16847 16848 16867 were removed due to different NSB level

Data analysis

MC production

According to the data_quality.ipynb, the NSB level in the FoV of SN2024bch is low enough to consider the standard MC.

  • MC used:
    • 20240131_allsky_v0.10.5_all_dec_base
  • Declination line:
    • dec_6166 (4.8 deg away from SN 2024bch)

Declination map SN2024bch.png

Pointing issues

We could not fit 3 OFF positions in several runs due to small offset angular distance of the wobbles.

  • Possible solutions (applied in this analysis):
    • Reduce the max_theta_cut to 0.26 deg
    • Use only 1 OFF position

DL3 production

The DL3 are produced using the following standard parameters:

  • Intensity cut: [50GeV, infty]
  • w1: [0.01, 1]
  • r: [0, 1]
  • leakage_intensity_width_2: [0, 1]
  • event_type: [32, 32]
  • theta_containment: 0.7
  • gh_efficiency: 0.7
  • min_livetime: 300
  • max_zenith: 90

DL3 data are stored here:

  • /fefs/aswg/workspace/andrea.simongini/SN2024bch/DL3

Theta-squared plots

  • We produced theta-squared plots with all good quality data:
    • n_wobbles: 4
    • theta2_cut: 0.04
    • energy bounds: [50GeV-100GeV]; [100GeV-1TeV]; [1TeV-10TeV]
    • gammaness_cut: 0.7
    • theta2_cut: 0.07 deg2
  • Plots:

Declination map SN2024bch.png

  • Results:
    • [50GeV-100GeV]: N_on = 287155; N_off = 6220812; Significance = -0.572341
    • [100GeV-1TeV]: N_on = 107335; N_off = 2284060; Significance = -1.255360
    • [1TeV-10TeV]: N_on = 267; N_off = 6189; Significance = -1.701900
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