Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Aug 15 14:34:51 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger765130
======================================================================

  Trigger: 00765130      Segment: 000

  BAT Trigger Time: 522975818.88   [s; MET]
      Trigger Stop: 522975819.136   [s; MET]
               UTC: 2017-07-28T23:03:19.438780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 238.044095700942   Dec: 70.1423694896049  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.73
     Image Trigger?:     NO
     Rate S/N Ratio:     41.5571895103603  [ if not an image trigger ]
     Image S/N Ratio:    6.73

  Analysis Position:   [ source = BAT ]
    RA: 238.044095700942   Dec: 70.1423694896049  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA:    Dec:   [deg; J2000]  
        { 00h 00m 00.0s , +00d 00' 00.0" }
         +/- -inf [arcmin] (estimated 90% radius based on SNR)
         +/- 0 [arcmin] (formal 1-sigma fit error)
    SNR: 
 
  Angular difference between the analysis and refined position is -4778.571352 arcmin
 
  Partial Coding Fraction: 0.05126953    [ including projection effects ]

  Duration
     T90: 47.6800000071526 +/- 26.496695635164
        Measured from: 0.0559999942779541
                   to: 47.7360000014305     [s; relative to TRIGTIME]
     T50: 19.1999999880791 +/- 26.3931530977479
        Measured from: 0.439999997615814
                   to: 19.6399999856949     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0920000076293945     
                   to: 0.907999992370605     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0719999670982361     
                   to: 50.5519999861717     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.469871   1.313646   0.635031   0.110905
           0.203273   0.215489   0.192223   0.164690 [error]
 Peak      0.127635   0.303286   0.414489   0.162809
           0.041725   0.047321   0.049444   0.034627 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   50.624   -0.072   50.552
T90    47.680    0.056   47.736
T50    19.200    0.440   19.640
Peak    1.000   -0.092    0.908
 
 
====== 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      -1.871    -0.383      0.344       -           -               -         3.56e-03     -9.55e-04          9.35e-04      70.260   57
CPL      1.441    -1.172      7.607       48.309      -8.593         8.026      1.86e-01     -1.86e-01          1.81e+03      58.000   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.169     -0.233     0.241       -           -               -         6.66e-02     -1.05e-02          1.05e-02      66.190   57
CPL      0.489     -1.238     1.771       91.706     -19.852        86.618      3.27e-01     -3.27e-01          1.25e+00      60.510   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   3.28e-07  4.79e-07  5.21e-07  1.06e-06  1.65e-06  2.38e-06   erg/cm2
      90%_error_low -1.07e-07 -1.19e-07 -1.70e-07 -5.44e-07 -4.35e-07 -7.78e-07   erg/cm2
      90%_error_hi   1.17e-07  1.19e-07  1.75e-07  7.95e-07  4.43e-07  9.63e-07   erg/cm2
Peak flux       PL   2.68e-04  3.66e-03  3.63e-02  3.62e+00  1.88e-01  3.62e+00   ph/cm2/s
      90%_error_low -1.42e-05 -5.21e-04 -7.48e-04 -5.36e-01 -2.73e-02 -4.96e-01   ph/cm2/s
      90%_error_hi   3.77e-04  3.67e-03  3.94e-02  1.95e+00  1.38e-01  2.06e+00   ph/cm2/s
 
Fluence        CPL   1.57e-07  7.24e-07  5.35e-07  2.47e-08  1.44e-06  1.44e-06   erg/cm2
      90%_error_low -1.07e-07 -1.80e-07 -2.59e-07    N/A    -3.73e-07 -3.73e-07   erg/cm2
      90%_error_hi   1.37e-07  1.90e-07  2.61e-07    N/A     4.11e-07  4.20e-07   erg/cm2
Peak flux      CPL   1.21e+00  2.56e+00  2.70e+00  1.30e+00  7.37e+00  7.76e+00   ph/cm2/s
      90%_error_low -6.47e-01 -5.79e-01 -5.09e-01 -6.66e-01 -1.31e+00 -1.52e+00   ph/cm2/s
      90%_error_hi   8.05e-01  5.66e-01  5.31e-01  1.25e+00  1.34e+00  1.76e+00   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
  238.0188    70.1111   0.0213    55.2709    10.0366         3.1859843      9.038 TRIG_00765130                 
 
Foreground time interval of the image:
 -0.040  52.392 (delta_t =  52.432 [sec])
Background time interval of the image:
-239.880  -0.040 (delta_t = 239.840 [sec])




    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   -0.072 sec. to   50.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87136     ( -0.374857   0.352328 )
Norm@50keV  : 3.55924E-03    ( -0.000951901   0.000938537 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.26 using 59 PHA bins.
# Reduced chi-squared =          1.233 for     57 degrees of freedom 
# Null hypothesis probability =   1.115003e-01
 
Photon flux (15-150 keV)    in 50.62 sec: 0.505134 ( -0.126857  0.127768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65414e-06 ( -4.34695e-07  4.43409e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.072 sec. to   50.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.43613     ( -3.38188   5.39705 )
Epeak [keV] : 46.4729      ( -6.63383 9.98502 )
Norm@50keV  : 2.24565    ( -2.1831   1805.98 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.75 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     56 degrees of freedom 
# Null hypothesis probability =   4.467302e-01
 
Photon flux (15-150 keV)    in 50.62 sec: 0.447189 ( -0.120636  0.127005 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.44013e-06 ( -3.72697e-07  4.11146e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.092 sec. to    0.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1695     ( -0.233349   0.241263 )
Norm@50keV  : 6.66306E-02    ( -0.0105309   0.0104566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.19 using 59 PHA bins.
# Reduced chi-squared =          1.161 for     57 degrees of freedom 
# Null hypothesis probability =   1.895037e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.188389 ( -0.027334  0.138299 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.82025e-07 ( -1.06002e-07  1.06073e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.092 sec. to    0.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.488726     ( -1.23757   1.77094 )
Epeak [keV] : 91.7061      ( -19.852 86.6182 )
Norm@50keV  : 0.327372    ( -0.327374   1.25055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.51 using 59 PHA bins.
# Reduced chi-squared =          1.081 for     56 degrees of freedom 
# Null hypothesis probability =   3.162605e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.37137 ( -1.31472  1.33946 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.70363e-07 ( -1.12073e-07  1.10294e-07 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 47.68 sec.
Hardness ratio (energy fluence ratio) = 1.08928153285

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

    S(15-50 keV)  = 8.063002e-07
S(50-150 keV) = 8.4783e-07

    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 = 1.420540216816482E+00, IMY = -2.514151513748106E-01

    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:
-239.880000 -0.072000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
196.2002  14.9679    2.2  14.6  117.9   1.1267   5.3 ------	UNKNOWN                       
224.4736  67.8034    2.5  50.0    9.1   2.0579   4.6 ------	UNKNOWN                       
165.5516  -2.7667    3.2  32.6 -153.0   0.8709   3.6 ------	UNKNOWN                       
162.1775  46.8872    2.4  28.7  -41.8   1.2298   4.9 ------	UNKNOWN                       
161.3406 -24.9434    2.5  54.0 -163.6   3.0255   4.7 ------	UNKNOWN

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

    Time interval of the image:
-0.072000 50.552000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
237.9847  70.1172    1.8  55.3   10.0   2.8139   6.6 ------	UNKNOWN                       
212.7808  64.9968    2.1  44.7    7.2   0.7622   5.6 ------	UNKNOWN                       
175.0341  49.3327    2.2  26.1  -23.2   0.4515   5.3 ------	UNKNOWN                       
162.7955   6.5672    2.2  27.1 -136.7   0.4576   5.2 ------	UNKNOWN                       
157.3265  38.3635    2.4  26.8  -61.4   0.4978   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
452.720600 962.150000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4588  35.3643    9.3  35.9  132.4   0.8320   1.2    1.3	Her X-1                       
299.3344  59.3203    2.2  26.9   57.8   2.4471   5.2 ------	UNKNOWN                       
177.3180  34.3641    4.1  48.1 -129.1   4.8454   2.8 ------	UNKNOWN