batgrbproduct Analysis for Trigger=922808

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Wed Aug 28 17:44:04 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger922808
======================================================================

  Trigger: 00922808      Segment: 000

  BAT Trigger Time: 588690022.912   [s; MET]
      Trigger Stop: 588690023.936   [s; MET]
               UTC: 2019-08-28T12:59:59.424820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.818484637617   Dec: 27.2367605883349  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.03
     Image Trigger?:     NO
     Rate S/N Ratio:     23.8537208837531  [ if not an image trigger ]
     Image S/N Ratio:    10.03

  Flight Position:   [ source = BAT ]
    RA: 251.818484637617   Dec: 27.2367605883349  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 251.838387884022   Dec: 27.2869246830542  [deg; J2000]  
        { 16h 47m 21.2s , +27d 17' 12.9" }
         +/- 0.975221194161496 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.282165456439403 [arcmin] (formal 1-sigma fit error)
    SNR: 31.5271951911798
 
  Angular difference between Flight and Ground position is 3.191560 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 66.5799999237061 +/- 6.24039258261463
        Measured from: -28.7999999523163
                   to: 37.7799999713898     [s; relative to TRIGTIME]
     T50: 24.6039998531342 +/- 2.6524652771161
        Measured from: 0.676000118255615
                   to: 25.2799999713898     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 10.7440000772476     
                   to: 11.7440000772476     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -42.3639999628067     
                   to: 53.3400000333786     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.596961   2.312677   1.994119   0.543440
           0.072643   0.074906   0.067101   0.057449 [error]
 Peak      0.074160   0.104776   0.106709   0.036038
           0.008476   0.009478   0.009395   0.007267 [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 4.42e-07 9.24e-07 1.51e-06 5.55e-06 4.16e-06 8.42e-06   erg/cm2
              Error 3.22e-08 3.86e-08 6.57e-08 5.64e-07 1.64e-07 5.99e-07   erg/cm2
Peak flux Power-law 5.98e-01 7.35e-01 6.56e-01 1.01e+00 2.34e+00 3.00e+00   ph/cm2/s
              Error 1.01e-01 7.58e-02 7.22e-02 2.36e-01 2.15e-01 3.05e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.45e-07 9.23e-07 1.50e-06 5.74e-06 4.17e-06 8.51e-06   erg/cm2
              Error -------- 4.00e-08 5.85e-08 9.02e-07 1.90e-07 1.34e-06   erg/cm2
Peak flux Cutoff-PL 5.81e-01 7.45e-01 6.67e-01 8.49e-01 2.33e+00 2.84e+00   ph/cm2/s
              Error 1.14e-01 8.46e-02 8.18e-02 3.17e-01 2.20e-01 4.58e-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    1.292    0.068    -      -           4.40e-03 1.57e-04   48.430 57
CPL   1.278    0.149    9966.7    0.0      4.46e-03 3.63e-04   48.720 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.164    0.160    -      -           2.00e-02 1.83e-03   61.180 57
CPL   1.018    0.460     356.9    0.0      2.36e-02 1.41e-02   60.990 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: 68.224000 sec.
T50 in the 50-300 keV band: 19.712000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   95.704  -42.364   53.340
T90    66.580  -28.800   37.780
T50    24.604    0.676   25.280
Peak    1.000   10.744   11.744

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  251.8384    27.2869   0.0061     2.9670   -20.4016         4.3500472     31.527 TRIG_00922808                 
 
Foreground time interval of the image:
-42.364  17.789 (delta_t =  60.153 [sec])
Background time interval of the image:
-447.611 -433.221 (delta_t =  14.390 [sec])
-239.912 -42.364 (delta_t = 197.548 [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

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

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

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

Spectral Evolution

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model
Time interval is from  -42.364 sec. to   53.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.29237     ( -0.0678052   0.0675305 )
Norm@50keV  : 4.39575E-03    ( -0.000157009   0.000157009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.43 using 59 PHA bins.
# Reduced chi-squared =         0.8496 for     57 degrees of freedom 
# Null hypothesis probability =   7.834818e-01
 
Photon flux (15-150 keV)    in 95.7 sec: 0.523700 ( -0.019805  0.019859 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.16526e-06 ( -1.63396e-07  1.63987e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -42.364 sec. to   53.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.27848     ( -0.228727   0.0702611 )
Epeak [keV] : 9966.67      ( -9999.33 -9999.33 )
Norm@50keV  : 4.45959E-03    ( -0.000156537   0.000569206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.72 using 59 PHA bins.
# Reduced chi-squared =         0.8701 for     56 degrees of freedom 
# Null hypothesis probability =   7.441195e-01
 
Photon flux (15-150 keV)    in 95.7 sec: 0.524663 ( -0.023963  0.021073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.1738e-06 ( -2.00772e-07  1.79431e-07 ) ergs/cm2
 

Peak spectrum fit

Power-law model
Time interval is from   10.744 sec. to   11.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16410     ( -0.159996   0.1591 )
Norm@50keV  : 2.00376E-02    ( -0.00183121   0.00182863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.18 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     57 degrees of freedom 
# Null hypothesis probability =   3.284157e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.34082 ( -0.21472  0.21481 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.05433e-07 ( -2.1703e-08  2.19039e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   10.744 sec. to   11.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.01846     ( -0.631478   0.28839 )
Epeak [keV] : 356.936      ( -356.936 -356.936 )
Norm@50keV  : 2.35835E-02    ( -0.00519816   0.0230519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.99 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.013059e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.32787 ( -0.2208  0.22005 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.03348e-07 ( -2.34609e-08  2.25748e-08 ) ergs/cm2
 

Plot creation:
Wed Aug 28 18:13:52 EDT 2019