Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time: Fri Oct 13 22:02:14 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1167973
======================================================================

  Trigger: 01167973      Segment: 000

  BAT Trigger Time: 705413219.84   [s; MET]
      Trigger Stop: 705413220.864   [s; MET]
               UTC: 2023-05-10T12:06:28.582740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 318.155739208481   Dec: 34.4426846404614  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.66
     Image Trigger?:     NO
     Rate S/N Ratio:     21.7485631709315  [ if not an image trigger ]
     Image S/N Ratio:    10.66

  Analysis Position:   [ source = BAT ]
    RA: 318.155739208481   Dec: 34.4426846404614  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 318.136041854508   Dec: 34.4342091674516  [deg; J2000]  
        { 21h 12m 32.7s , +34d 26' 03.2" }
         +/- 0.876726902986284 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.234886008920805 [arcmin] (formal 1-sigma fit error)
    SNR: 36.7063127697341
 
  Angular difference between the analysis and refined position is 1.099387 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 178.367999911308 +/- 6.93123251560823
        Measured from: -138.976000070572
                   to: 39.3919998407364     [s; relative to TRIGTIME]
     T50: 22.7199999094009 +/- 5.63090894757922
        Measured from: -1.37600004673004
                   to: 21.3439998626709     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 15.8839999437332     
                   to: 16.8839999437332     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -145.632000088692     
                   to: 56.095999956131     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.018531   6.165685   4.935458   1.168790
           0.269637   0.280848   0.241296   0.198083 [error]
 Peak      0.204935   0.274253   0.234908   0.065214
           0.013268   0.014622   0.013485   0.009948 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  201.728 -145.632   56.096
T90   178.368 -138.976   39.392
T50    22.720   -1.376   21.344
Peak    1.000   15.884   16.884
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.635    -0.095      0.094       -           -               -         5.57e-03     -2.80e-04          2.79e-04      67.970   57
CPL     -1.615    -0.115      0.260      972.797    -972.797      -972.797      5.70e-03     -3.99e-04          1.51e-04      68.070   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.334     -0.105     0.104       -           -               -         4.90e-02     -2.83e-03          2.83e-03      51.480   57
CPL     -1.322     -0.116     0.350     9978.300    -9978.300      -9978.300      4.96e-02     -3.29e-03          2.24e-02      51.560   56
 
 
=== 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         PL   1.63e-06  2.76e-06  3.55e-06  9.21e-06  1.05e-05  1.71e-05   erg/cm2
      90%_error_low -1.42e-07 -1.42e-07 -2.41e-07 -1.31e-06 -5.61e-07 -1.49e-06   erg/cm2
      90%_error_hi   1.47e-07  1.41e-07  2.40e-07  1.46e-06  5.64e-07  1.61e-06   erg/cm2
Peak flux       PL   1.72e+00  1.91e+00  1.52e+00  1.99e+00  5.88e+00  7.14e+00   ph/cm2/s
      90%_error_low -1.82e-01 -1.23e-01 -1.09e-01 -2.89e-01 -3.44e-01 -4.27e-01   ph/cm2/s
      90%_error_hi   1.88e-01  1.22e-01  1.08e-01  3.19e-01  3.44e-01  4.31e-01   ph/cm2/s
 
Fluence        CPL   1.64e-06  2.75e-06  3.53e-06  1.01e-05  1.05e-05  1.68e-05   erg/cm2
      90%_error_low -1.62e-07 -1.47e-07 -2.24e-07    N/A    -6.43e-07 -2.89e-06   erg/cm2
      90%_error_hi   1.51e-07  1.64e-07  2.58e-07    N/A     5.91e-07  1.86e-06   erg/cm2
Peak flux      CPL   1.72e+00  1.91e+00  1.51e+00  2.04e+00  5.89e+00  7.20e+00   ph/cm2/s
      90%_error_low -1.87e-01 -1.22e-01 -1.10e-01 -7.29e-01 -3.66e-01 -8.92e-01   ph/cm2/s
      90%_error_hi   1.87e-01  1.34e-01  1.28e-01  1.27e-01  3.49e-01  3.66e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

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

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  318.1360    34.4342   0.0052     8.6178   -17.2314         6.4120871     36.706 TRIG_01167973                 
 
Foreground time interval of the image:
-32.939  11.461 (delta_t =  44.400 [sec])
Background time interval of the image:




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from -145.632 sec. to   56.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63502     ( -0.0945728   0.0935679 )
Norm@50keV  : 5.57112E-03    ( -0.000279858   0.000278728 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.97     using 59 bins.
 Reduced chi-squared = 1.19246
# Null hypothesis probability of 1.52e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 201.7 sec: 0.723927 ( -0.036862  0.037001 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04685e-05 ( -5.6099e-07  5.64018e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -145.632 sec. to   56.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63318     ( -0.11489   0.260268 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 5.58324E-03    ( -0.000281024   0.000269058 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.98     using 59 bins.
 Reduced chi-squared = 1.21393
# Null hypothesis probability of 1.31e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 201.7 sec: 0.725923 ( -0.043466  0.038627 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04951e-05 ( -6.42588e-07  5.90695e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   15.884 sec. to   16.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.334     ( -0.104631   0.104483 )
Norm@50keV  : 4.90013E-02    ( -0.00283176   0.0028252 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.48     using 59 bins.
 Reduced chi-squared = 0.903158
# Null hypothesis probability of 6.81e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.88425 ( -0.34357  0.34401 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.80386e-07 ( -3.14132e-08  3.16258e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   15.884 sec. to   16.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32169     ( -0.10621   0.359534 )
Epeak [keV] : 9978.30      ( -9999.34 -9999.34 )
Norm@50keV  : 4.96448E-02    ( -0.00284154   0.02284 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.56     using 59 bins.
 Reduced chi-squared = 0.920714
# Null hypothesis probability of 6.43e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.89159 ( -0.36602  0.34858 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.81271e-07 ( -3.59533e-08  3.24768e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 178.368 sec.
Hardness ratio (energy fluence ratio) = 1.28789324963

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = 4.385355e-06
S(50-150 keV) = 6.083181e-06

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = 1.447515832337387E-01, IMY = 4.489497646591305E-02

    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:

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

    Time interval of the image:
-32.939400 11.460600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4928  35.4718    4.3  44.0  127.5  -2.3031  -2.7    7.9	Her X-1                       
288.9273  11.0207    8.5  35.7   64.8   0.4793   1.4    8.8	GRS 1915+105                  
299.5427  35.2115    1.6  10.7   86.6   1.2347   7.3    2.4	Cyg X-1                       
308.2082  40.9131    6.3   2.1  114.4   0.2932   1.8    5.0	Cyg X-3                       
325.9936  38.2874    8.9  11.8  -56.1  -0.2132  -1.3    8.6	Cyg X-2                       
299.4753  15.6480    2.5  27.3   50.5   0.8664   4.5 ------	UNKNOWN                       
318.1361  34.4342    0.3   8.6  -17.2   6.4121  36.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
51.060600 782.430000
900.160000 934.860600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.8158  11.0724    7.3  35.5   70.3  -2.9087  -1.6    7.7	GRS 1915+105                  
299.5309  35.1887    1.0  15.3  112.5  11.2988  11.2    3.0	Cyg X-1                       
307.9130  40.9282   10.4  10.4  146.1   1.0255   1.1    9.1	Cyg X-3                       
325.9576  38.4126   13.0   7.4 -110.2  -0.8684  -0.9   11.5	Cyg X-2                       
286.5464  19.6293    2.8  31.6   84.7   6.3829   4.1 ------	UNKNOWN                       
308.9518  -8.9020    3.7  44.2   27.5   4.3989   3.1 ------	UNKNOWN