Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jun 21 15:21:57 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger756284
======================================================================

  Trigger: 00756284      Segment: 000

  BAT Trigger Time: 518570512.896   [s; MET]
      Trigger Stop: 518570513.92   [s; MET]
               UTC: 2017-06-07T23:21:33.713940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 7.34357806330534   Dec: 9.23797385784254  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.32
     Image Trigger?:     NO
     Rate S/N Ratio:     41.821047332653  [ if not an image trigger ]
     Image S/N Ratio:    16.32

  Analysis Position:   [ source = BAT ]
    RA: 7.34357806330534   Dec: 9.23797385784254  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 7.35798348835567   Dec: 9.22449023832508  [deg; J2000]  
        { 00h 29m 25.9s , +09d 13' 28.2" }
         +/- 1.01266702398168 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.32009528664773 [arcmin] (formal 1-sigma fit error)
    SNR: 29.875064679646
 
  Angular difference between the analysis and refined position is 1.175731 arcmin
 
  Partial Coding Fraction: 0.5703125    [ including projection effects ]

  Duration
     T90: 320 +/- 172.325273828304
        Measured from: -191.896000027657
                   to: 128.103999972343     [s; relative to TRIGTIME]
     T50: 192 +/- 150.943698112906
        Measured from: -143.896000027657
                   to: 48.1039999723434     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.60399997234344     
                   to: 8.60399997234344     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -207.896000027657     
                   to: 144.103999972343     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.547108   4.578176   3.260995   0.659440
           0.138965   0.145247   0.127647   0.110512 [error]
 Peak      0.087767   0.127296   0.086378   0.016081
           0.009489   0.010320   0.008786   0.007334 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  352.000 -207.896  144.104
T90   320.000 -191.896  128.104
T50   192.000 -143.896   48.104
Peak    1.000    7.604    8.604
 
 
====== 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      -1.625    -0.072      0.072       -           -               -         2.32e-03     -8.96e-05          8.93e-05      42.220   57
CPL     -1.579    -0.114      0.241      465.611    -465.611      -465.611      2.45e-03     -2.09e-04          7.28e-04      42.280   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      -1.666     -0.167     0.164       -           -               -         2.06e-02     -2.10e-03          2.07e-03      57.950   57
CPL     -1.583     -0.717     0.627      220.114      N/A           N/A         2.29e-02        N/A               N/A         57.900   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   1.17e-06  2.00e-06  2.59e-06  6.79e-06  7.63e-06  1.26e-05   erg/cm2
      90%_error_low -8.20e-08 -8.18e-08 -1.32e-07 -7.40e-07 -3.11e-07 -8.32e-07   erg/cm2
      90%_error_hi   8.41e-08  8.15e-08  1.32e-07  8.01e-07  3.12e-07  8.79e-07   erg/cm2
Peak flux       PL   9.97e-01  9.09e-01  5.73e-01  5.53e-01  2.71e+00  3.03e+00   ph/cm2/s
      90%_error_low -1.46e-01 -8.59e-02 -7.56e-02 -1.33e-01 -2.52e-01 -2.84e-01   ph/cm2/s
      90%_error_hi   1.51e-01  8.56e-02  7.53e-02  1.57e-01  2.53e-01  2.85e-01   ph/cm2/s
 
Fluence        CPL   1.17e-06  2.01e-06  2.60e-06  6.77e-06  7.62e-06  1.24e-05   erg/cm2
      90%_error_low -1.02e-07 -8.84e-08 -1.09e-07 -2.33e-06 -3.55e-07 -2.39e-06   erg/cm2
      90%_error_hi   6.92e-08  8.95e-08  1.39e-07  4.81e-07  3.19e-07  1.02e-06   erg/cm2
Peak flux      CPL   9.86e-01  9.18e-01  5.75e-01  4.91e-01  2.70e+00  2.97e+00   ph/cm2/s
      90%_error_low -1.63e-01 -9.37e-02 -7.72e-02     N/A   -2.54e-01 -3.89e-01   ph/cm2/s
      90%_error_hi   8.46e-02  1.07e-01  7.90e-02     N/A    2.58e-01  3.41e-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
    7.3580     9.2245   0.0064    28.0316   132.9764         6.2914612     29.875 TRIG_00756284                 
 
Foreground time interval of the image:
-122.995  13.805 (delta_t = 136.800 [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 -207.896 sec. to  144.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62528     ( -0.072468   0.0721692 )
Norm@50keV  : 2.32298E-03    ( -8.958e-05   8.93247e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.22 using 59 PHA bins.
# Reduced chi-squared =         0.7408 for     57 degrees of freedom 
# Null hypothesis probability =   9.280700e-01
 
Photon flux (15-150 keV)    in 352 sec: 0.300910 ( -0.012181  0.01223 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.62576e-06 ( -3.11465e-07  3.12448e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -207.896 sec. to  144.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62335     ( -0.111382   0.243878 )
Epeak [keV] : 9996.03      ( -9995.7 -9995.7 )
Norm@50keV  : 2.32821E-03    ( -8.9223e-05   0.000848082 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.22 using 59 PHA bins.
# Reduced chi-squared =         0.7540 for     56 degrees of freedom 
# Null hypothesis probability =   9.134945e-01
 
Photon flux (15-150 keV)    in 352 sec: 0.300692 ( -0.013345  0.012407 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.6189e-06 ( -3.55119e-07  3.18581e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    7.604 sec. to    8.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66607     ( -0.167266   0.163981 )
Norm@50keV  : 2.06408E-02    ( -0.00210146   0.00207279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.95 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     57 degrees of freedom 
# Null hypothesis probability =   4.399693e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.70974 ( -0.25239  0.25253 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.91695e-07 ( -2.06186e-08  2.08691e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    7.604 sec. to    8.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58305     ( -0.717751   0.627121 )
Epeak [keV] : 220.114      (   )
Norm@50keV  : 2.28991E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.89 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.053505e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.70123 ( -0.25364  0.25808 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90187e-07 ( -2.31049e-08  2.20201e-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 = -3.629465970071011E-01, IMY = -3.895343691985889E-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:
-122.995400 13.804600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
357.3081  15.8868    1.8  39.6  137.9   2.3065   6.3 ------	UNKNOWN                       
357.4795  25.7640    2.4  43.9  151.3   1.9051   4.8 ------	UNKNOWN                       
  7.3580   9.2245    0.4  28.0  133.0   6.2906  29.9 ------	UNKNOWN                       
 13.4773  25.3928    2.3  32.7  166.2   1.1081   5.0 ------	UNKNOWN                       
  2.0004  49.8441    1.9  57.4  177.7   6.0188   6.0 ------	UNKNOWN                       
 63.4691 -51.7358    3.5  56.8   -0.2   2.6704   3.3 ------	UNKNOWN                       
 69.5285 -23.8268    2.6  41.7  -32.3   1.2838   4.4 ------	UNKNOWN                       
 73.3284   4.4960    3.5  40.0  -76.6   2.2105   3.3 ------	UNKNOWN                       
 77.1245  -3.6513    3.4  43.5  -64.2   2.5482   3.4 ------	UNKNOWN                       
 61.9377  39.6879    3.0  48.1 -129.2   3.4264   3.9 ------	UNKNOWN                       
 62.7977  37.9781    2.8  47.2 -127.0   3.6046   4.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
62.404590 836.886000
900.104000 962.157600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2369  38.2280    7.0  46.9  156.1   2.6455   1.7    6.4	Cyg X-2                       
 13.5503 -13.5443    3.3  23.6    6.0   1.7877   3.5 ------	UNKNOWN                       
 29.5390 -40.4280    2.5  53.7    0.3   6.9802   4.6 ------	UNKNOWN                       
 15.4297  -2.3488    2.7  14.1  -14.0   2.0825   4.2 ------	UNKNOWN                       
 40.8430  48.1001    3.0  48.0 -129.1  10.9304   3.8 ------	UNKNOWN                       
 46.9500  26.2135    4.9  41.1  -98.4   6.5090   2.4 ------	UNKNOWN                       
 52.4685  -4.2975    3.4  46.9  -54.0   9.6062   3.4 ------	UNKNOWN