Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Apr 11 00:07:17 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger892607
======================================================================

  Trigger: 00892607      Segment: 000

  BAT Trigger Time: 574007036.224   [s; MET]
      Trigger Stop: 574007037.248   [s; MET]
               UTC: 2019-03-11T14:23:33.671280    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 212.102032655211   Dec: 53.5194678294132  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.45
     Image Trigger?:     NO
     Rate S/N Ratio:     13.4164078649987  [ if not an image trigger ]
     Image S/N Ratio:    8.45

  Analysis Position:   [ source = BAT ]
    RA: 212.102032655211   Dec: 53.5194678294132  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.064293932901   Dec: 53.4805887644857  [deg; J2000]  
        { 14h 08m 15.4s , +53d 28' 50.1" }
         +/- 1.32306908775071 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.434736092911697 [arcmin] (formal 1-sigma fit error)
    SNR: 20.3905557087685
 
  Angular difference between the analysis and refined position is 2.693650 arcmin
 
  Partial Coding Fraction: 0.796875    [ including projection effects ]

  Duration
     T90: 13.9519999027252 +/- 5.3155650397405
        Measured from: -1.1599999666214
                   to: 12.7919999361038     [s; relative to TRIGTIME]
     T50: 5.43999993801117 +/- 1.08799991186927
        Measured from: 1.01600003242493
                   to: 6.4559999704361     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.740000009536743     
                   to: 1.74000000953674     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.12000000476837     
                   to: 22.0080000162125     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.564787   0.549613   0.413052   0.105191
           0.044494   0.046046   0.041745   0.038944 [error]
 Peak      0.072263   0.078793   0.046906   0.014275
           0.010192   0.010591   0.009787   0.008402 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   24.128   -2.120   22.008
T90    13.952   -1.160   12.792
T50     5.440    1.016    6.456
Peak    1.000    0.740    1.740
 
 
====== 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      -1.770    -0.171      0.166       -           -               -         4.19e-03     -4.15e-04          4.07e-04      64.630   57
CPL     -1.773    -0.168      0.401     9999.350    -9999.340      -9999.350      4.19e-03     -2.30e-03          2.54e-03      64.640   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      -1.849     -0.311     0.286       -           -               -         1.28e-02     -2.38e-03          2.27e-03      62.200   57
CPL     -1.858     -1.107     0.544     9999.320      N/A           N/A         1.27e-02        N/A               N/A         62.200   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   1.66e-07  2.59e-07  3.04e-07  6.89e-07  9.32e-07  1.42e-06   erg/cm2
      90%_error_low -2.29e-08 -2.23e-08 -4.17e-08 -1.79e-07 -9.45e-08 -2.20e-07   erg/cm2
      90%_error_hi   2.36e-08  2.23e-08  4.18e-08  2.19e-07  9.60e-08  2.51e-07   erg/cm2
Peak flux       PL   7.35e-01  6.02e-01  3.34e-01  2.73e-01  1.79e+00  1.94e+00   ph/cm2/s
      90%_error_low -1.66e-01 -8.90e-02 -8.24e-02 -1.14e-01 -2.66e-01 -2.92e-01   ph/cm2/s
      90%_error_hi   1.75e-01  8.89e-02  8.22e-02  1.54e-01  2.66e-01  2.93e-01   ph/cm2/s
 
Fluence        CPL   1.66e-07  2.56e-07  2.43e-07  7.36e-07  9.39e-07  1.42e-06   erg/cm2
      90%_error_low -2.29e-08 -2.49e-08 -4.07e-08 -3.97e-07 -9.01e-08 -3.61e-07   erg/cm2
      90%_error_hi   2.36e-08  3.33e-08  3.25e-08  6.25e-08  8.90e-08  2.22e-07   erg/cm2
Peak flux      CPL   6.95e-01  4.77e-01  2.24e-01  1.72e-01  1.47e+00  1.57e+00   ph/cm2/s
      90%_error_low -2.06e-01 -1.39e-01 -2.24e-01 -1.72e-01     N/A       N/A     ph/cm2/s
      90%_error_hi   1.97e-01  1.39e-01  9.06e-02  1.07e-01     N/A       N/A     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
  212.0643    53.4806   0.0094    33.0248   -13.3909         1.5117489     20.391 TRIG_00892607                 
 
Foreground time interval of the image:
 -2.120  11.077 (delta_t =  13.197 [sec])
Background time interval of the image:
-239.224  -2.120 (delta_t = 237.104 [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   -2.120 sec. to   22.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.77012     ( -0.170862   0.166186 )
Norm@50keV  : 4.18926E-03    ( -0.000415426   0.000407399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.63 using 59 PHA bins.
# Reduced chi-squared =          1.134 for     57 degrees of freedom 
# Null hypothesis probability =   2.275926e-01
 
Photon flux (15-150 keV)    in 24.13 sec: 0.570748 ( -0.049662  0.049751 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.31917e-07 ( -9.44897e-08  9.59505e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.120 sec. to   22.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.77272     ( -0.168519   0.401113 )
Epeak [keV] : 9999.35      ( -9999.35 -9999.36 )
Norm@50keV  : 4.19016E-03    ( -0.00230156   0.00254281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.64 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     56 degrees of freedom 
# Null hypothesis probability =   2.005241e-01
 
Photon flux (15-150 keV)    in 24.13 sec: 0.571379 ( -0.050721  0.04946 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.38592e-07 ( -9.01202e-08  8.90158e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.740 sec. to    1.740 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84877     ( -0.311232   0.286447 )
Norm@50keV  : 1.27627E-02    ( -0.00237922   0.00227002 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.20 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.964598e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.79313 ( -0.26552  0.2657 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17371e-07 ( -2.1274e-08  2.1826e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.740 sec. to    1.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.69971     ( -0.274141   1.37663 )
Epeak [keV] : 229.099      (   )
Norm@50keV  : 4.90483E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.02 using 59 PHA bins.
# Reduced chi-squared =          1.090 for     56 degrees of freedom 
# Null hypothesis probability =   3.002416e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.46623 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17166e-07 ( -1.99405e-08  2.17269e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 13.952 sec.
Hardness ratio (energy fluence ratio) = 1.17276235526

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

    S(15-50 keV)  = 4.258647e-07
S(50-150 keV) = 5.06046e-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 = 6.323501214808236E-01, IMY = 1.505408696684990E-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:
-239.224000 -2.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
149.1992  20.7711    2.9  31.4  115.1   1.9063   4.0 ------	UNKNOWN                       
233.2294  38.8921    2.5  53.0   -6.1   2.9120   4.5 ------	UNKNOWN

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

    Time interval of the image:
-2.120000 11.076600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.0389  36.2134    2.5  40.5   12.9   0.4093   4.6 ------	UNKNOWN                       
159.4392  58.4855    2.3   7.0  -64.6   0.2873   5.0 ------	UNKNOWN                       
212.0643  53.4806    0.6  33.0  -13.4   1.5117  20.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
66.676640 962.852700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4889  35.3143    2.1  34.6  -34.1   5.5735   5.6    2.3	Her X-1                       
177.5346  35.4223    2.9  30.1  108.7   5.4402   3.9 ------	UNKNOWN                       
178.3131  35.8651    3.6  29.4  108.3   4.2575   3.2 ------	UNKNOWN                       
175.3928  40.9516    2.4  27.5  119.4   4.9752   4.8 ------	UNKNOWN                       
232.1929   0.4679    2.9  55.6   16.9  13.5194   4.0 ------	UNKNOWN                       
250.0809  15.4620    3.0  48.2  -11.2   5.2996   3.9 ------	UNKNOWN                       
 27.9268  75.4553    2.7  51.0 -137.2  17.2428   4.3 ------	UNKNOWN                       
359.9810  76.9028    2.7  48.0 -129.2  15.9140   4.2 ------	UNKNOWN