Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.47
    Process Start Time: Tue Jun  2 00:12:58 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger953689
======================================================================

  Trigger: 00953689      Segment: 000

  BAT Trigger Time: 602203300.352   [s; MET]
      Trigger Stop: 602203301.376   [s; MET]
               UTC: 2020-01-31T22:41:15.994140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 3.09544610319421   Dec: 51.123636218354  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    25.71
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    25.71

  Analysis Position:   [ source = BAT ]
    RA: 3.09544610319421   Dec: 51.123636218354  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 3.08896096317396   Dec: 51.1248790912871  [deg; J2000]  
        { 00h 12m 21.4s , +51d 07' 29.6" }
         +/- 0.471353036202913 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.137591063685911 [arcmin] (formal 1-sigma fit error)
    SNR: 89.077190335919
 
  Angular difference between the analysis and refined position is 0.255349 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 32.7399998903275 +/- 0.879054111945978
        Measured from: -1.96399998664856
                   to: 30.7759999036789     [s; relative to TRIGTIME]
     T50: 1.7279999256134 +/- 0.0509117071272196
        Measured from: -0.547999978065491
                   to: 1.17999994754791     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0160000324249268     
                   to: 1.01600003242493     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.45200002193451     
                   to: 46.555999994278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.440416   3.793163   3.287559   0.869917
           0.047341   0.051926   0.047015   0.036720 [error]
 Peak      0.619115   1.194116   1.211314   0.341292
           0.013797   0.018504   0.019321   0.012540 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   50.008   -3.452   46.556
T90    32.740   -1.964   30.776
T50     1.728   -0.548    1.180
Peak    1.000    0.016    1.016
 
 
====== 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      -1.315    -0.035      0.036       -           -               -         1.41e-02     -2.66e-04          2.66e-04      41.540   57
CPL     -1.174    -0.072      0.145      348.736    -145.137      7122.904      1.62e-02     -1.90e-03          2.39e-03      38.620   56
 
 
=== 1-s peak 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      -1.082     -0.035     0.035       -           -               -         2.32e-01     -4.71e-03          4.71e-03      77.030   57
CPL     -0.616     -0.150     0.155      179.646     -29.951        55.292      3.64e-01     -4.83e-02          5.74e-02      47.390   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   7.59e-07  1.56e-06  2.51e-06  9.03e-06  6.96e-06  1.39e-05   erg/cm2
      90%_error_low -3.11e-08 -3.74e-08 -5.20e-08 -4.40e-07 -1.32e-07 -4.58e-07   erg/cm2
      90%_error_hi   3.17e-08  3.73e-08  5.19e-08  4.56e-07  1.32e-07  4.71e-07   erg/cm2
Peak flux       PL   1.82e-03  2.17e-02  3.43e-01  2.98e+01  1.55e+00  3.00e+01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   7.28e-07  1.57e-06  2.55e-06  7.61e-06  6.91e-06  1.25e-05   erg/cm2
      90%_error_low -4.24e-08 -3.84e-08 -6.29e-08 -1.17e-06 -1.41e-07 -1.17e-06   erg/cm2
      90%_error_hi   4.33e-08  3.84e-08  6.33e-08  1.42e-06  1.41e-07  1.15e-06   erg/cm2
Peak flux      CPL   5.56e+00  8.38e+00  8.28e+00  8.80e+00  2.63e+01  3.10e+01   ph/cm2/s
      90%_error_low -3.56e-01 -2.26e-01 -2.21e-01 -9.89e-01 -5.93e-01 -1.19e+00   ph/cm2/s
      90%_error_hi   3.64e-01  2.26e-01  2.22e-01  1.15e+00  5.95e-01  1.31e+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
        3.0890    51.1249   0.0021    23.1579   -16.4227         9.8400643     89.077 TRIG_00953689                 
     
    Foreground time interval of the image:
     -3.452  13.549 (delta_t =  17.001 [sec])
    Background time interval of the image:
    -239.352  -3.452 (delta_t = 235.900 [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   -3.452 sec. to   46.556 sec.
    XSPEC12>exit
     XSPEC: quit
     
     
    Photon index: -1.31477     ( -0.0354386   0.0355306 )
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.31477     ( -0.0355306   0.0354386 )
    Norm@50keV  : 1.41323E-02    ( -0.000266309   0.000266095 )
    ------------------------------------------------------------
     
    Photon flux (15-150 keV)    in 50.01 sec: 1.69071 ( -0.03592  0.03604 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 6.95994e-06 ( -1.32046e-07  1.32354e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -3.452 sec. to   46.556 sec.
     XSPEC: quit
     
     
    Photon index: -1.17354     ( -0.0718057   0.145021 )
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.17354     ( -0.145021   0.0718057 )
    Epeak [keV] : 348.736      ( -145.146 7122.89 )
    Norm@50keV  : 1.62116E-02    ( -0.00189892   0.00238784 )
    ------------------------------------------------------------
     
    Photon flux (15-150 keV)    in 50.01 sec: 1.67206 ( -0.03999  0.04019 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 6.90998e-06 ( -1.41413e-07  1.41118e-07 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.016 sec. to    1.016 sec.
    XSPEC12>exit
     XSPEC: quit
     
     
    Photon index: -1.08205     ( -0.0351305   0.0352274 )
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 1.08205     ( -0.0352274   0.0351305 )
    Norm@50keV  : 0.231958    ( -0.00471093   0.00470681 )
    ------------------------------------------------------------
     
    Photon flux (15-150 keV)    in 1 sec: 1.55392 (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.4395e-06 ( -5.13588e-08  5.13639e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.016 sec. to    1.016 sec.
     XSPEC: quit
     
     
    Photon index: -0.616037     ( -0.150435   0.155306 )
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: 0.616037     ( -0.155306   0.150435 )
    Epeak [keV] : 179.646      ( -29.9509 55.2923 )
    Norm@50keV  : 0.364429    ( -0.0482875   0.0573725 )
    ------------------------------------------------------------
     
    Photon flux (15-150 keV)    in 1 sec: 26.2606 ( -0.5932  0.5946 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 2.40392e-06 ( -5.34755e-08  5.33903e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 32.74 sec.
    Hardness ratio (energy fluence ratio) = 1.60797774166
    

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

    S(15-50 keV)  = 2.3208552e-06
    S(50-150 keV) = 4.639182e-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 = 4.102801948967180E-01, IMY = 1.209286996380831E-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:
    -239.352000 -3.452000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    326.1198  38.4952   21.6  48.7  -40.2   0.3498   0.5   10.7	Cyg X-2                       
    349.5442  68.5676    3.3  38.2    5.7   0.8973   3.5 ------	UNKNOWN                       
    302.6055  66.0729    3.5  55.2   -1.8   2.1549   3.3 ------	UNKNOWN                       
     49.5291 -15.3176    3.3  55.8 -176.5   2.8272   3.5 ------	UNKNOWN                       
     40.4257 -12.4290    3.3  50.6 -166.8   1.7083   3.5 ------	UNKNOWN                       
    326.8378  52.0468    3.1  45.2  -22.2   1.2402   3.7 ------	UNKNOWN                       
      1.7439  25.0999    3.4  26.0  -81.6   0.9043   3.4 ------	UNKNOWN                       
    339.9262  36.3834    2.6  38.9  -47.9   1.5484   4.5 ------	UNKNOWN                       
     22.0217 -16.1559    2.7  53.5 -144.0   4.7608   4.3 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -3.452000 13.548610
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    326.2395  38.1975    5.6  48.7  -40.6  -0.6550  -2.0    8.1	Cyg X-2                       
      3.0890  51.1249    0.1  23.2  -16.4   9.8400  89.1 ------	UNKNOWN                       
      6.3532  30.2837    3.2  19.9  -75.3   0.4504   3.6 ------	UNKNOWN                       
    301.3977  55.0610    3.6  59.2  -14.1   2.2017   3.2 ------	UNKNOWN                       
    311.9636  51.8132    2.2  54.3  -20.2   1.8197   5.1 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    57.948590 406.748600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    299.6848  35.0756    6.8  47.4  -40.9   1.9510   1.7    8.9	Cyg X-1                       
    308.1558  40.8593    8.7  38.6  -40.1  -0.6934  -1.3    6.0	Cyg X-3                       
    326.0376  38.4463   24.6  28.8  -58.3   0.2042   0.5    9.8	Cyg X-2                       
    301.3538  68.5686    2.8  33.6    7.6   1.6583   4.2 ------	UNKNOWN                       
    263.8814  53.9743    3.3  55.2   -1.8   3.7515   3.5 ------	UNKNOWN                       
     27.7030  13.2122    2.4  42.8 -173.4   2.3519   4.8 ------	UNKNOWN                       
     20.1234  -3.3561    3.0  56.4 -157.3   6.6594   3.9 ------	UNKNOWN                       
    357.8255   3.2176    3.3  48.1 -129.7   5.4205   3.7  233.0	UNKNOWN                       
    357.3317   3.3944    2.2  48.0 -129.0   7.8674   5.4  259.0	UNKNOWN                       
    357.5091   3.1030    3.7  48.3 -129.3   5.8186   4.0  238.7	UNKNOWN