batgrbproduct analysis for trigger=1351790

batgrbproduct Analysis for Trigger=1351790

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Thu Sep 25 09:49:20 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1351790/GCN5_download_cron
======================================================================

  Trigger: 01351790      Segment: 000

  BAT Trigger Time: 780394745.664   [s; MET]
      Trigger Stop: 780394762.048   [s; MET]
               UTC: 2025-09-24T08:18:29.279420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 51.8650857219976   Dec: 74.6519011868246  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.59
     Image Trigger?:     NO
     Rate S/N Ratio:     13.9283882771841  [ if not an image trigger ]
     Image S/N Ratio:    7.59

  Flight Position:   [ source = BAT ]
    RA: 51.8650857219976   Dec: 74.6519011868246  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 51.9075634228292   Dec: 74.6653056137565  [deg; J2000]  
        { 03h 27m 37.8s , +74d 39' 55.1" }
         +/- 1.68657173002263 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.782197329723424 [arcmin] (formal 1-sigma fit error)
    SNR: 14.4153697035566
 
  Angular difference between Flight and Ground position is 1.049534 arcmin
 
  Partial Coding Fraction: 0.1230469    [ including projection effects ]

  Duration
     T90: 26.527999997139 +/- 3.71814147999738
        Measured from: -8.19199991226196
                   to: 18.336000084877     [s; relative to TRIGTIME]
     T50: 14.3359999656677 +/- 2.71369857181295
        Measured from: -0.639999866485596
                   to: 13.6960000991821     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 15.7799999713898     
                   to: 16.7799999713898     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.92000007629395     
                   to: 20     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.757894   1.140066   1.165762   0.436935
           0.118745   0.127137   0.105728   0.083052 [error]
 Peak      0.040003   0.080734   0.077878   0.030985
           0.022244   0.024403   0.020862   0.016555 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 3.20e-07 5.99e-07 8.66e-07 2.66e-06 2.46e-06 4.44e-06   erg/cm2
              Error 6.44e-08 7.43e-08 1.01e-07 6.74e-07 2.61e-07 7.30e-07   erg/cm2
Peak flux Power-law 6.06e-01 6.75e-01 5.37e-01 7.08e-01 2.08e+00 2.53e+00   ph/cm2/s
              Error 3.54e-01 2.49e-01 1.65e-01 4.54e-01 6.77e-01 7.31e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.83e-07 6.21e-07 9.21e-07 1.53e-06 2.43e-06 3.35e-06   erg/cm2
              Error 7.96e-08 8.31e-08 1.27e-07 1.15e-06 2.67e-07 7.98e-07   erg/cm2
Peak flux Cutoff-PL 4.86e-01 7.20e-01 5.94e-01 3.17e-01 2.00e+00 2.12e+00   ph/cm2/s
              Error 4.09e-01 2.95e-01 2.08e-01 5.35e-01 6.96e-01 9.11e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.468    0.174    -      -           8.62e-03 9.04e-04   66.190 57
CPL   0.965    0.687     117.9  -38.4      1.45e-02 1.18e-02   64.610 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.330    0.499    -      -           1.73e-02 5.13e-03   48.310 57
CPL   0.372    5.806      92.6  -25.9      4.87e-02 1.25e+00   47.700 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 21.632000 sec.
T50 in the 50-300 keV band: 13.760000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   29.920   -9.920   20.000
T90    26.528   -8.192   18.336
T50    14.336   -0.640   13.696
Peak    1.000   15.780   16.780
  • Click here for the BAT GCN circular template
  • Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte

    Image

    Pre-slew 15-350 keV image (Event data; bkg subtracted)

    #   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
       51.9076 +74.6653 0.0133   54.8 -165.2       3.9008    14.4  TRIG_01351790       
    ------------------------------------------
     
    Foreground time interval of the image:
     -9.920  20.000 (delta_t =  29.920 [sec])
    Background time interval of the image:
    -239.664  -9.920 (delta_t = 229.744 [sec])
    

    Lightcurves

    Notes:

    1 s binning

    From T0-310 s to T0+310 s
    From T100_start - 20 s to T100_end + 30 s
    Full time interval

    64 ms binning

    Full time interval
    From T100_start to T100_end
    From T0-5 sec to T0+5 sec

    16 ms binning

    From T100_start-5 s to T100_start+5 s
    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    8 ms binning

    From T100_start-3 s to T100_start+3 s
    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    2 ms binning

    From T100_start-1 s to T100_start+1 s
    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    SN=5 or 10 sec. binning (whichever binning is satisfied first)

    SN=5 or 10 sec. binning (T < 200 sec)

    Spectra

    Notes:

    Time averaged spectrum fit using the pre-slew DRM

    Power-law model
    Time interval is from   -9.920 sec. to   20.000 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.46823     ( -0.175515   0.172776 )
    Norm@50keV  : 8.62273E-03    ( -0.000905409   0.000903455 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          66.19 using 59 PHA bins.
    # Reduced chi-squared =          1.161 for     57 degrees of freedom 
    # Null hypothesis probability =   1.894005e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.06753 ( -0.125289  0.126294 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.46064e-06 ( -2.61017e-07  2.61351e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -9.920 sec. to   20.000 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.965074     ( -0.793955   0.58104 )
    Epeak [keV] : 117.859      ( -41.0815 -117.859 )
    Norm@50keV  : 1.45317E-02    ( -0.00641531   0.0171792 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
    # Reduced chi-squared =          1.154 for     56 degrees of freedom 
    # Null hypothesis probability =   2.012660e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.04152 ( -0.130052  0.13091 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.4291e-06 ( -2.67796e-07  2.66707e-07 ) ergs/cm2
     
    
    Band function
    Time interval is from   -9.920 sec. to   20.000 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -0.965149   ( -0.501316   0.778645 )
    beta        : -10.0000    ( 10   1.06581e-14 )
    Epeak [keV] : 117.851      ( -33.7437 -117.851 )
    Norm@50keV   : 1.45295E-02    ( -0.00645574   0.0172302 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
    # Reduced chi-squared =          1.175 for     55 degrees of freedom 
    # Null hypothesis probability =   1.761632e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.05304 (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    
    Single BB
     
    Spectral model blackbody:
    ------------------------------------------------------------
    Parameters  : value    Lower 90%  Upper 90%
    kT [keV]    : 18.4452  (-2.13656  2.50542)
    R^2/D10^2   : 6.01519E-02  (-0.0222519   0.0337232)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          81.79 using 59 PHA bins.
    # Reduced chi-squared =          1.435 for     57 degrees of freedom 
    # Null hypothesis probability =   1.736459e-02
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.216e-07   2.778e-08
    25- 50  5.727e-07   1.053e-07
    50-150  1.423e-06   2.308e-07
    15-150  2.117e-06   2.985e-07
    
    Thermal bremsstrahlung (OTTB)
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 200.000       (-47.8142      -200)
    Norm        : 4.49124       (-0.468428     0.468428)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  3.347e-07   5.270e-08
    25- 50  6.440e-07   1.503e-07
    50-150  1.412e-06   5.923e-07
    15-150  2.391e-06   8.159e-07
    
    Double BB
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 6.13818        (-1.82799      3.06798)
    R1^2/D10^2  : 1.59072        (-1.20931      5.17262)
    kT2 [keV]   : 24.5743        (-4.30341      8.35006)
    R2^2/D10^2  : 1.88545E-02    (-0.0125887   0.0160615)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  3.057e-07   1.617e-07
    25- 50  5.935e-07   2.318e-07
    50-150  1.533e-06   5.436e-07
    15-150  2.432e-06   8.179e-07
    

    Peak spectrum fit

    Power-law model
    Time interval is from   15.780 sec. to   16.780 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.32967     ( -0.522797   0.475493 )
    Norm@50keV  : 1.73307E-02    ( -0.0051585   0.00509545 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          48.31 using 59 PHA bins.
    # Reduced chi-squared =         0.8475 for     57 degrees of freedom 
    # Null hypothesis probability =   7.870549e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.07933 ( -0.668001  0.686719 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.70053e-07 ( -4.98884e-08  5.0068e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   15.780 sec. to   16.780 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.372330     ( -3.79153   7.82001 )
    Epeak [keV] : 92.5689      ( -40.7449 -92.5846 )
    Norm@50keV  : 4.86583E-02    ( -0.0486409   2.44776 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          47.70 using 59 PHA bins.
    # Reduced chi-squared =         0.8518 for     56 degrees of freedom 
    # Null hypothesis probability =   7.771878e-01
     
    Photon flux (15-150 keV)    in 1 sec: 2.00101 ( -0.68509  0.70633 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.62893e-07 ( -5.5199e-08  5.2265e-08 ) ergs/cm2
     
    
    Band function
    Time interval is from   15.780 sec. to   16.780 sec.
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : 4.36760   ( -4.36761   -4.36761 )
    beta        : -1.65461    ( -3.38084   0.680351 )
    Epeak [keV] : 37.8633      ( -37.8538 200.94 )
    Norm@50keV   : 61.1547    ( -61.3136   25.2711 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          47.12 using 59 PHA bins.
    # Reduced chi-squared =         0.8567 for     55 degrees of freedom 
    # Null hypothesis probability =   7.662579e-01
     
    Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.6519e-07 ( -1.65183e-07  -4.978e-08 ) ergs/cm2
     
    
    Single BB
     XSPEC: quit
     
     
    Spectral model blackbody:
    ------------------------------------------------------------
    Parameters  : value    Lower 90%  Upper 90%
    kT [keV]    : 17.3065  (-4.74688  8.36841)
    R^2/D10^2   : 0.154677  (-0.154403   0.339114)
    (R is the radius in km and D10 is the distance to the source in units of 10 kpc)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  9.388e-09   5.888e-09
    25- 50  4.213e-08   2.508e-08
    50-150  9.059e-08   5.895e-08
    15-150  1.421e-07   8.640e-08
    
    Thermal bremsstrahlung (OTTB)
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: thermal bremsstrahlung
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT [keV]    : 199.361       (-109.318      -199.363)
    Norm        : 9.01657       (-2.62395     2.62415)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  2.245e-08   1.388e-08
    25- 50  4.319e-08   2.643e-08
    50-150  9.472e-08   5.790e-08
    15-150  1.604e-07   9.605e-08
    
    Double BB
    XSPEC12>exit
     XSPEC: quit
     
     
    Spectral model: bbodyrad<1> + bbodyrad<2>
    ------------------------------------------------------------
    Parameters  : value         Lower 90%    Upper 90%
    kT1 [keV]   : 12.8981        (-11.7867      9.78819)
    R1^2/D10^2  : 0.352312        (-0.348394      -0.348394)
    kT2 [keV]   : 80.7213        (-87.1034      -87.1034)
    R2^2/D10^2  : 9.06949E-04    (-0.00070849   0.305245)
    ------------------------------------------------------------
     Reduced chi-squared = 
     
    Energy  Fluence     90% Error
    [keV]   [erg/cm2]   [erg/cm2]
    15- 25  1.352e-08   9.215e-09
    25- 50  4.557e-08   3.114e-08
    50-150  1.066e-07   5.680e-08
    15-150  1.657e-07   8.430e-08
    

    Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

    Power-law model
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.46823     ( -0.175515   0.172776 )
    Norm@50keV  : 8.62273E-03    ( -0.000905409   0.000903455 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          66.19 using 59 PHA bins.
    # Reduced chi-squared =          1.161 for     57 degrees of freedom 
    # Null hypothesis probability =   1.894005e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.06753 ( -0.125289  0.126294 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.46064e-06 ( -2.61017e-07  2.61351e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.965074     ( -0.793955   0.58104 )
    Epeak [keV] : 117.859      ( -41.0815 -117.859 )
    Norm@50keV  : 1.45317E-02    ( -0.00641531   0.0171792 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
    # Reduced chi-squared =          1.154 for     56 degrees of freedom 
    # Null hypothesis probability =   2.012660e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.04152 ( -0.130052  0.13091 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.4291e-06 ( -2.67796e-07  2.66707e-07 ) ergs/cm2
     
    
    Band function
     
    Spectral model in the Band function:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    alpha       : -0.965149   ( -0.501316   0.77864 )
    beta        : -10.0000    ( 10   20 )
    Epeak [keV] : 117.851      ( -33.7437 -117.851 )
    Norm@50keV   : 1.45295E-02    ( -0.00645574   0.0172302 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
    # Reduced chi-squared =          1.175 for     55 degrees of freedom 
    # Null hypothesis probability =   1.761632e-01
     
    Photon flux (15-150 keV)    in 29.92 sec: 1.05304 (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    S(25-50 keV) vs. S(50-100 keV) plot

    S(25-50 keV)  = 5.99e-07
    S(50-100 keV) = 8.66e-07
    

    T90 vs. Hardness ratio plot

    T90                                   = 26.527999997139 sec.
    Hardness ratio (energy fluence ratio) = 1.44574
    

    Color vs. Color plot

    Count Ratio  (25-50 keV) / (15-25 keV) = 1.50426
    Count Ratio (50-100 keV) / (15-25 keV) = 1.53816
    

    Mask shadow pattern

    IMX = -1.368530591935290E+00, IMY = 3.627529546043436E-01
    

    TIME vs. PHA plot around the trigger time

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    TIME vs. DetID plot around the trigger time

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    100 us light curve (15-350 keV)

    Blue+Cyan dotted lines: Time interval of the scaled map
    From 0.000000 to 16.384000
    

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band

    Time interval of the image:
    -239.664000 -9.920000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6178  22.0113    0.5  20.8  -81.2   9.1800  21.6    0.9	Crab                          
     16.4613  72.1672    3.1  57.9 -176.9   6.0814   3.7 ------	UNKNOWN                       
     88.0218  29.3134    2.9  25.8  -98.2   1.8409   4.0 ------	UNKNOWN                       
    103.1814  65.9269    2.8  53.1 -142.2   7.1336   4.1 ------	UNKNOWN                       
    105.3279   9.1310    3.0  43.8  -64.2   6.2764   3.9 ------	UNKNOWN                       
    

    Pre-slew background subtracted image of 15-350 keV band

    Time interval of the image:
    -9.920000 20.000000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.7437  21.8906   37.7  20.9  -80.9  -0.0271  -0.3    9.6	Crab                          
     70.9060 -26.5190    1.9  47.6    6.3   0.8458   6.1 ------	UNKNOWN                       
     71.1096 -22.6282    2.6  43.8    4.9   0.5070   4.5 ------	UNKNOWN                       
     51.9075  74.6653    0.8  54.8 -165.2   3.9015  14.4 ------	UNKNOWN                       
     79.1545  72.1217    2.0  53.0 -155.4   1.2737   5.6 ------	UNKNOWN                       
     98.0524 -14.7632    2.2  50.2  -30.9   0.9048   5.3 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    171.436600 429.796000
    431.336000 638.958800
    640.336000 962.474100
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6075  22.0169    1.2  55.2    2.2  26.6229   9.7    1.4	Crab                          
     74.8849  66.6250    3.0  10.9  -16.2   3.9233   3.9 ------	UNKNOWN                       
    280.7056  86.4947    2.4  17.8 -150.0   4.2893   4.8 ------	UNKNOWN                       
    106.7560  35.2791    2.2  47.1  -27.2   9.9198   5.2 ------	UNKNOWN                       
    138.1993  47.4260    3.5  43.8  -64.2  16.1508   3.3 ------	UNKNOWN                       
    
    Plot creation:
    Thu Sep 25 09:53:20 EDT 2025