GRB220310A

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Alert Information

• Name/type of the alert: Name
• GCN notice: https://gcn.gsfc.nasa.gov/gcn3/31725.gcn3
• Triggered by: MAXI
• Alert coordinates:
  • RA: 11 13 02.33 (hh mm ss), Dec: +23 15 08 (dd mm ss)
  • RA, Dec in deg (ICRS): 168.2597083, +23.2522222
• Alert arrival time: 2022-03-10 01:01:48 UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2022-03-09
  • 2022-03-09
    • Zenith range (deg): 6 -> 35
    • Transmission9km:
    • Observation condition: moon -> dark
    • Observation mode: std wobbles
    • Runs: 7371 - 7378 (moon: 7371,7372)
    • Joint observations with MAGIC? : No
    • ELOG link: Logbook URL
    • Important comments: NSB level of Run7371,7372 should be below 2x dark NSB according to PMT anode current

Analysis by Kenta

Analysis configuration

• Analyzer: Kenta Terauchi (Kyoto Univ., email: terauchi.kenta.74s@st.kyoto-u.ac.jp)

• Software versions:
  • lstchain v0.9.2

• Cuts and parameters used:
  • intensity > 50
  • gammaness > 0.4, 0.7
  • leakage < 0.2

• DL1 files :

Used DL1b files produced by LSTOSA (lstchain v0.9.X)

/fefs/aswg/data/real/DL1/20220302/v0.9/tailcut84/dl1_LST-1.Run0{7371-7378}.h5

• Random Forest :

src-indep (diffuse gamma, src_r<3deg, disp_norm)

/fefs/aswg/data/models/20200629_prod5_trans_80/zenith_20deg/south_pointing/20220215_v0.9.1_prod5_trans_80_local_tailcut_8_4

• DL2 MC data for IRF:

• Overall selected observation time: 132 min (2.2 h)

• Position analyzed: 168.2597083, 23.2522222 (deg)

• Analysis/data problems:

Theta2 plot

• theta < 0.2
• norm_range_theta2: 0.3 - 0.5

Theta2 plot for GRB220310A using only 1st run; gammaness > 0.4

Theta2 plot for GRB220310A using only 1st run; gammaness > 0.7

Theta2 plot for GRB220310A using only all runs; gammaness > 0.4

Theta2 plot for GRB220310A using all runs; gammaness > 0.7

Excess/Significance Evolution

Excess evolution plot for GRB220310A; gammaness > 0.4

Significance evolution plot for GRB220310A; gammaness > 0.4

Excess evolution plot for GRB220310A; gammaness > 0.7

Significance evolution plot for GRB220310A; gammaness > 0.7

Skymap

• Background estimation method: ring background (mainly developed by Mathieu)

Skymap for GRB220310A; gammaness > 0.4; colorbar of the significance map has been adjusted for visualization

Skymap for GRB220310A; gammaness > 0.7; colorbar of the significance map has been adjusted for visualization