Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.47
    Process Start Time: Mon May 18 15:01:12 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger949361
======================================================================

  Trigger: 00949361      Segment: 000

  BAT Trigger Time: 600781848   [s; MET]
      Trigger Stop: 600781912   [s; MET]
               UTC: 2020-01-15T11:50:23.734140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 56.4539329277401   Dec: 5.61281785041262  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.01
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    15.01

  Analysis Position:   [ source = BAT ]
    RA: 56.4539329277401   Dec: 5.61281785041262  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 56.4518326005438   Dec: 5.60776455911605  [deg; J2000]  
        { 03h 45m 48.4s , +05d 36' 28.0" }
         +/- 1.13035909116946 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.377095709742856 [arcmin] (formal 1-sigma fit error)
    SNR: 25.5325920508074
 
  Angular difference between the analysis and refined position is 0.328113 arcmin
 
  Partial Coding Fraction: 0.828125    [ including projection effects ]

  Duration
     T90: 242.139999985695 +/- 27.2340727025964
        Measured from: -54.3519999980927
                   to: 187.787999987602     [s; relative to TRIGTIME]
     T50: 64.067999958992 +/- 6.30407527055165
        Measured from: 56.2680000066757
                   to: 120.335999965668     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 99.7480000257492     
                   to: 100.748000025749     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -122.904000043869     
                   to: 231.18799996376     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     5.675779   7.322475   4.753215   0.782666
           0.156855   0.162595   0.139983   0.118669 [error]
 Peak      0.115763   0.148657   0.151272   0.029834
           0.010487   0.011775   0.010501   0.007492 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  354.092 -122.904  231.188
T90   242.140  -54.352  187.788
T50    64.068   56.268  120.336
Peak    1.000   99.748  100.748
 
 
====== 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: CPL)
 
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      -1.774    -0.055      0.055       -           -               -         3.42e-03     -1.03e-04          1.03e-04      53.920   57
CPL     -1.212    -0.236      0.249       70.826      -8.354        16.335      6.46e-03     -1.48e-03          2.05e-03      36.190   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      -1.391     -0.127     0.127       -           -               -         2.95e-02     -2.28e-03          2.28e-03      60.840   57
CPL     -0.812     -0.509     0.574      111.445     -31.086       323.213      5.55e-02     -2.32e-02          4.57e-02      56.990   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   1.99e-06  3.10e-06  3.63e-06  8.19e-06  1.11e-05  1.69e-05   erg/cm2
      90%_error_low -1.06e-07 -9.78e-08 -1.44e-07 -6.89e-07 -3.43e-07 -7.94e-07   erg/cm2
      90%_error_hi   1.08e-07  9.75e-08  1.44e-07  7.31e-07  3.43e-07  8.24e-07   erg/cm2
Peak flux       PL   1.09e+00  1.17e+00  8.94e-01  1.11e+00  3.58e+00  4.27e+00   ph/cm2/s
      90%_error_low -1.47e-01 -1.01e-01 -8.21e-02 -1.95e-01 -2.85e-01 -3.34e-01   ph/cm2/s
      90%_error_hi   1.53e-01  1.00e-01  8.14e-02  2.17e-01  2.85e-01  3.35e-01   ph/cm2/s
 
Fluence        CPL   1.78e-06  3.23e-06  3.73e-06  3.94e-06  1.06e-05  1.27e-05   erg/cm2
      90%_error_low -1.33e-07 -1.13e-07 -1.57e-07 -9.41e-07 -3.95e-07 -1.03e-06   erg/cm2
      90%_error_hi   1.35e-07  1.14e-07  1.58e-07  1.30e-06  3.95e-07  1.35e-06   erg/cm2
Peak flux      CPL   9.62e-01  1.23e+00  9.58e-01  6.54e-01  3.51e+00  3.80e+00   ph/cm2/s
      90%_error_low -1.82e-01 -1.15e-01 -1.00e-01 -2.35e-01 -2.93e-01 -3.89e-01   ph/cm2/s
      90%_error_hi   1.88e-01  1.17e-01  1.02e-01  3.96e-01  2.93e-01  4.73e-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
   56.4518     5.6078   0.0075    30.1069  -165.2481         4.6212126     25.533 TRIG_00949361                 
 
Foreground time interval of the image:
-10.899  84.701 (delta_t =  95.600 [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
    Multiple GTIs in the spectrum
tstart tstop
-122.904000 148.626800
150.000000 231.188000
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.77401     ( -0.0553888   0.0551125 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77401     ( -0.0551125   0.0553888 )
Norm@50keV  : 3.42302E-03    ( -0.000103211   0.000103058 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 352.7 sec: 0.467039 ( -0.015092  0.015143 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1128e-05 ( -3.42587e-07  3.43407e-07 ) ergs/cm2
    Cutoff power-law model
    Multiple GTIs in the spectrum
tstart tstop
-122.904000 148.626800
150.000000 231.188000
 XSPEC: quit
 
 
Photon index: -1.21205     ( -0.236036   0.249358 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.21205     ( -0.249358   0.236036 )
Epeak [keV] : 70.8263      ( -8.35355 16.3353 )
Norm@50keV  : 6.45937E-03    ( -0.00147924   0.00205247 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 352.7 sec: 0.448127 ( -0.016735  0.016806 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06447e-05 ( -3.94932e-07  3.94922e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   99.748 sec. to  100.748 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.39135     ( -0.127255   0.126818 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.39135     ( -0.126818   0.127255 )
Norm@50keV  : 2.94505E-02    ( -0.00227859   0.00227567 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 3.57961 ( -0.28501  0.28542 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85115e-07 ( -2.38868e-08  2.39928e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   99.748 sec. to  100.748 sec.
 XSPEC: quit
 
 
Photon index: -0.811558     ( -0.508641   0.573597 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.811558     ( -0.573597   0.508641 )
Epeak [keV] : 111.445      ( -31.0865 323.213 )
Norm@50keV  : 5.55027E-02    ( -0.0232214   0.0456659 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 3.50811 ( -0.29286  0.29261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78914e-07 ( -2.48284e-08  2.48386e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -5.607287817869183E-01, IMY = 1.476473434765085E-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:

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

    Time interval of the image:
-10.899400 84.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6412  22.0171    0.7  26.3  126.3   3.7519  16.8    0.5	Crab                          
 17.7203  76.4124    3.0  44.5   -0.4   1.2008   3.9 ------	UNKNOWN                       
 56.4518   5.6077    0.5  30.1 -165.2   4.6210  25.6 ------	UNKNOWN                       
 53.4295   2.2978    3.1  33.6 -160.0   0.7355   3.8 ------	UNKNOWN                       
329.8511  59.4692    2.9  58.9  -24.3   4.6618   4.0 ------	UNKNOWN                       
 26.6600   0.8002    3.0  45.3 -121.3   2.9980   3.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
113.500590 148.626800
150.000000 204.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6547  22.0056    0.7  27.9  138.6   3.4546  16.7    1.3	Crab                          
116.0010  40.1874    2.6  39.4   80.6   2.9615   4.4 ------	UNKNOWN                       
 99.7764  15.9907    3.8  42.0  123.9   1.8590   3.0 ------	UNKNOWN                       
 57.6124  61.5941    2.8  18.2   -2.4   0.6727   4.2 ------	UNKNOWN                       
 65.7142 -14.0225    2.1  57.7 -179.1   5.3588   5.6 ------	UNKNOWN                       
 61.9003   0.7548    2.7  42.8 -174.6   1.1343   4.3 ------	UNKNOWN                       
 48.8447  43.0228    2.6   9.8  -83.9   0.6847   4.4 ------	UNKNOWN                       
 56.4397   5.6105    0.5  38.3 -165.8   5.1991  24.6 ------	UNKNOWN