GRB170307A: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Apr 12 14:54:41 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger741528
======================================================================

  Trigger: 00741528      Segment: 000

  BAT Trigger Time: 510611080   [s; MET]
      Trigger Stop: 510611152   [s; MET]
               UTC: 2017-03-07T20:24:21.280840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 13.5352800445089   Dec: 9.53652894499694  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.12
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.12

  Analysis Position:   [ source = BAT ]
    RA: 13.5352800445089   Dec: 9.53652894499694  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 13.514118959145   Dec: 9.53587930870353  [deg; J2000]  
        { 00h 54m 03.4s , +09d 32' 09.2" }
         +/- 2.46736282940119 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.38057196833961 [arcmin] (formal 1-sigma fit error)
    SNR: 8.37115719688091
 
  Angular difference between the analysis and refined position is 1.252726 arcmin
 
  Partial Coding Fraction: 0.4335938    [ including projection effects ]

  Duration
     T90: 29.91999989748 +/- 28.176160486023
        Measured from: 56.160000026226
                   to: 86.0799999237061     [s; relative to TRIGTIME]
     T50: 13.2159999012947 +/- 6.53420695337461
        Measured from: 65.2200000286102
                   to: 78.4359999299049     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 69.7239999771118     
                   to: 70.7239999771118     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 55.2039999961853     
                   to: 125.096000015736     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.824420   0.818859   0.501033   0.207930
           0.085220   0.092843   0.088831   0.095467 [error]
 Peak      0.054904   0.068698   0.035263  -0.012848
           0.010868   0.012384   0.011454   0.011525 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   69.892   55.204  125.096
T90    29.920   56.160   86.080
T50    13.216   65.220   78.436
Peak    1.000   69.724   70.724
 
 
====== 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      -1.886    -0.236      0.223       -           -               -         2.05e-03     -3.14e-04          3.06e-04      44.580   57
CPL     -1.734    -0.529      0.979       71.924      N/A           N/A         2.51e-03        N/A               N/A         44.480   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      -1.902     -0.399     0.359       -           -               -         9.90e-03     -2.71e-03          2.63e-03      58.750   57
CPL     -0.407     -1.676     4.077       40.478     -14.820       -40.478      8.18e-02     -8.18e-02          4.48e+01      56.550   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   2.63e-07  3.82e-07  4.13e-07  8.36e-07  1.32e-06  1.89e-06   erg/cm2
      90%_error_low -4.33e-08 -4.52e-08 -8.58e-08 -3.01e-07 -1.95e-07 -4.03e-07   erg/cm2
      90%_error_hi   4.43e-08  4.51e-08  8.82e-08  4.01e-07  2.02e-07  4.85e-07   erg/cm2
Peak flux       PL   6.00e-01  4.77e-01  2.55e-01  1.99e-01  1.42e+00  1.53e+00   ph/cm2/s
      90%_error_low -1.66e-01 -1.01e-01 -8.73e-02 -1.04e-01 -3.00e-01 -3.33e-01   ph/cm2/s
      90%_error_hi   1.74e-01  1.01e-01  9.15e-02  1.58e-01  3.00e-01  3.38e-01   ph/cm2/s
 
Fluence        CPL   2.60e-07  3.89e-07  4.10e-07  6.07e-07  1.29e-06  1.67e-06   erg/cm2
      90%_error_low -4.66e-08 -5.13e-08 -9.80e-08 -4.90e-07 -2.38e-07 -5.72e-07   erg/cm2
      90%_error_hi   4.64e-08  6.18e-08  9.10e-08  2.99e-07  1.99e-07  3.68e-07   erg/cm2
Peak flux      CPL   5.51e-01  5.66e-01  2.23e-01  2.78e-02  1.36e+00  1.37e+00   ph/cm2/s
      90%_error_low -1.84e-01 -1.45e-01 -2.23e-01 -2.78e-02 -3.02e-01 -3.05e-01   ph/cm2/s
      90%_error_hi   1.87e-01  1.66e-01  1.18e-01  2.17e-01  3.05e-01  3.30e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   13.5141     9.5359   0.0229    33.2805   -55.7184         2.1799000      8.371 TRIG_00741528                 
 
Foreground time interval of the image:
 55.204 125.096 (delta_t =  69.892 [sec])
Background time interval of the image:
-60.000  55.204 (delta_t = 115.204 [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

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   55.204 sec. to  125.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88575     ( -0.235828   0.222683 )
Norm@50keV  : 2.04709E-03    ( -0.000314219   0.000305574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.58 using 59 PHA bins.
# Reduced chi-squared =         0.7822 for     57 degrees of freedom 
# Null hypothesis probability =   8.841957e-01
 
Photon flux (15-150 keV)    in 69.89 sec: 0.292036 ( -0.034122  0.034122 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31545e-06 ( -1.95147e-07  2.01515e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   55.204 sec. to  125.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73435     ( -0.529437   0.979151 )
Epeak [keV] : 71.9241      (   )
Norm@50keV  : 2.51282E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.48 using 59 PHA bins.
# Reduced chi-squared =         0.7944 for     56 degrees of freedom 
# Null hypothesis probability =   8.662812e-01
 
Photon flux (15-150 keV)    in 69.89 sec: 0.290115 ( -0.03562  0.035338 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.28835e-06 ( -2.38411e-07  1.99381e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   69.724 sec. to   70.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.90211     ( -0.398759   0.359068 )
Norm@50keV  : 9.90036E-03    ( -0.00271006   0.00262972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.75 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     57 degrees of freedom 
# Null hypothesis probability =   4.112803e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.42218 ( -0.29987  0.29995 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.10458e-08 ( -2.35992e-08  2.49013e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   69.724 sec. to   70.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.407043     ( -1.68219   4.07077 )
Epeak [keV] : 40.4779      ( -14.7666 -40.4239 )
Norm@50keV  : 8.17516E-02    ( -0.0830045   44.8315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.55 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     56 degrees of freedom 
# Null hypothesis probability =   4.541734e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36453 ( -0.30181  0.30513 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.71472e-08 ( -2.39168e-08  2.90395e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 29.92 sec.
Hardness ratio (energy fluence ratio) = 1.08245538743

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

S(15-50 keV)  = 6.44644e-07
S(50-150 keV) = 6.708224e-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 = 3.697188030351253E-01, IMY = 5.423614920818834E-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:
-60.000000 55.204000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 69.4353  35.0971    2.4  52.7   28.9   5.8235   4.8 ------	UNKNOWN                       
 59.9715   0.9974    2.7  22.2   60.6   0.9995   4.2 ------	UNKNOWN                       
 28.4947 -44.0532    2.4  35.6 -165.8   1.2271   4.8 ------	UNKNOWN                       
 19.4498  -1.0193    2.8  22.9  -69.0   1.0980   4.1 ------	UNKNOWN                       
  2.0541  13.2337    3.1  44.8  -60.3   3.8316   3.7 ------	UNKNOWN                       

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

Time interval of the image:
55.204000 125.096000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  5.4658 -61.5338    2.9  57.6 -161.8   3.7872   3.9 ------	UNKNOWN                       
 13.5156   9.5368    1.4  33.3  -55.7   2.2188   8.5 ------	UNKNOWN                       
358.5688 -15.4478    2.1  41.3 -102.9   3.9267   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
366.200640 963.090000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5115 -40.5241    0.9  30.3    5.5   6.7708  12.2    2.0	Vela X-1                      
170.4827 -60.4494   22.6  22.9  -61.4   0.3827   0.5   11.5	Cen X-3                       
186.4586 -62.8259    7.7  26.1  -79.0   1.1393   1.5    6.4	GX 301-2                      
155.8464 -22.7280    3.5  22.1   60.7   1.8543   3.3 ------	UNKNOWN                       
 90.3049 -51.0283    2.8  58.4  -19.5  10.7965   4.1 ------	UNKNOWN                       
 97.4271 -72.5502    4.3  50.5  -44.5   7.8310   2.7 ------	UNKNOWN                       
237.0810 -49.1577    4.1  45.3 -121.3   6.6411   2.8 ------	UNKNOWN