GRB230512A

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Alert Information

• Name/type of the alert: Name
• GCN notice: https://gcn.nasa.gov/circulars/33778
• Triggered by: Fermi GBM (but alert from TH by Fermi-LAT)
• Alert coordinates (From Fermi-LAT):
  • RA: 19 41 36.00 (hh mm ss), Dec: +38 24 00.00 (dd mm ss)
  • RA, Dec in deg (ICRS): 295.4, 38.4
• Alert arrival time: 06:27:45 UT
• Other relevant information:
  • Redshift (z): n/a

Multi-wavelength Observations

Timeline

T0+	Instrument	Outcome	Outcome specific value (flux/UL/...)	Comment	Link
0-300 s after the GBM trigger	Fermi-LAT	Detection	(1.0 ± 0.3) E-05 ph/cm2/s	The highest-energy photon is a 1.7 GeV	https://gcn.nasa.gov/circulars/33780
45.5 - 57.3 ks	Swift-XRT	No aparent detection	Nine uncatalogued X-ray sources have been detected	However none of them is above the RASS limit or shows definitive signs of fading.	https://gcn.nasa.gov/circulars/33789
2 hours	Zwicky Transient Facility	No aparent detection	Two sources were found within the 95% localization region	These are likely unrelated as they fall outside the LAT localization	https://gcn.nasa.gov/circulars/33784

LST Observations

• * Dates of data-taking: 2023-05-12
  • 2023-05-12 (4.1 h)
    • Zenith range (deg): 62 - 15
    • Transmission9km: n/a
    • Observation condition: dark, moonlight, high level of dust, moderate cloudiness
    • Observation mode: std wobbles
    • Runs: 12962 - 12973
    • Joint observations with MAGIC? : Yes
    • ELOG link: [1]
    • Important comments: '

Analysis by Arnau Aguasca-Cabot (UB - arnau.aguasca@fqa.ub.edu)

Data-taking information

• Overall selected observation time:
• Selected runs:
• Position analyzed: RA, Dec

DL1 data

Used DL1b files produced by LSTOSA

/fefs/aswg/data/real/DL1/20230512/v0.9/tailcut84/

DL2 data

• Random forest:

XXXXXXXXXXXXX

• lstchain v0.9.12 with config file

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Theta2 plot from DL2

• Cuts and parameters used:
  • intensity > 50
  • gammaness > 0.8
  • Theta2_global_cut=0.04
  • leakage < 0.2
  • norm_range_theta2_min=0.3
  • norm_range_theta2_max=0.5

Theta2 plot for GRB230512A.

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