GRB170203A: 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 15:27:32 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger736432
======================================================================

  Trigger: 00736432      Segment: 000

  BAT Trigger Time: 507773039.616   [s; MET]
      Trigger Stop: 507773043.712   [s; MET]
               UTC: 2017-02-03T00:03:41.060220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 332.860488803399   Dec: 25.1734109087689  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.81
     Image Trigger?:     NO
     Rate S/N Ratio:     11.4891252930761  [ if not an image trigger ]
     Image S/N Ratio:    7.81

  Analysis Position:   [ source = BAT ]
    RA: 332.860488803399   Dec: 25.1734109087689  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 332.859323193104   Dec: 25.1854591260923  [deg; J2000]  
        { 22h 11m 26.2s , +25d 11' 07.7" }
         +/- 2.18779393219831 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.02968493737673 [arcmin] (formal 1-sigma fit error)
    SNR: 9.94019564009821
 
  Angular difference between the analysis and refined position is 0.725658 arcmin
 
  Partial Coding Fraction: 0.671875    [ including projection effects ]

  Duration
     T90: 45.9039999246597 +/- 5.96155414134771
        Measured from: 0.748000025749207
                   to: 46.6519999504089     [s; relative to TRIGTIME]
     T50: 12.4359999299049 +/- 12.9255890910487
        Measured from: 3.80000001192093
                   to: 16.2359999418259     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.7039999961853     
                   to: 4.7039999961853     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0400000214576721     
                   to: 48.9760000109673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.301190   0.329008   0.250571   0.086948
           0.049112   0.051254   0.044633   0.039170 [error]
 Peak      0.022752   0.039297   0.026377   0.003386
           0.007297   0.007852   0.006827   0.005712 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   49.016   -0.040   48.976
T90    45.904    0.748   46.652
T50    12.436    3.800   16.236
Peak    1.000    3.704    4.704
 
 
====== 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      -1.510    -0.291      0.286       -           -               -         1.33e-03     -2.10e-04          2.08e-04      51.830   57
CPL     -1.520    -0.280      0.489     9999.320    -9999.320      -9999.320      1.33e-03     -2.02e-04          7.07e-04      51.850   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      -1.800     -0.442     0.405       -           -               -         5.66e-03     -1.61e-03          1.55e-03      46.440   57
CPL     -0.887     -1.266     2.988       53.285     -45.468       -53.285      1.85e-02     -1.85e-02          1.24e+00      45.580   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   8.40e-08  1.53e-07  2.16e-07  6.34e-07  6.18e-07  1.09e-06   erg/cm2
      90%_error_low -2.24e-08 -2.54e-08 -4.50e-08 -2.48e-07 -1.06e-07 -2.87e-07   erg/cm2
      90%_error_hi   2.40e-08  2.49e-08  4.40e-08  3.38e-07  1.07e-07  3.59e-07   erg/cm2
Peak flux       PL   3.11e-01  2.62e-01  1.51e-01  1.29e-01  7.80e-01  8.52e-01   ph/cm2/s
      90%_error_low -1.07e-01 -6.43e-02 -5.34e-02 -7.06e-02 -1.91e-01 -2.10e-01   ph/cm2/s
      90%_error_hi   1.15e-01  6.42e-02  5.38e-02  1.06e-01  1.92e-01  2.11e-01   ph/cm2/s
 
Fluence        CPL   8.41e-08  1.54e-07  2.12e-07  6.31e-07  6.21e-07  1.08e-06   erg/cm2
      90%_error_low    N/A       N/A       N/A       N/A    -1.46e-07 -3.96e-07   erg/cm2
      90%_error_hi     N/A       N/A       N/A       N/A     1.41e-07  3.62e-07   erg/cm2
Peak flux      CPL   2.82e-01  2.93e-01  1.53e-01  4.46e-02  7.61e-01  7.73e-01   ph/cm2/s
      90%_error_low -1.21e-01 -8.70e-02     N/A   -4.46e-02 -1.95e-01 -2.04e-01   ph/cm2/s
      90%_error_hi   1.26e-01  9.63e-02     N/A    1.15e-01  1.95e-01  2.42e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  332.8593    25.1855   0.0192    38.6025   -12.9895         1.0876962      9.940 TRIG_00736432                 
 
Foreground time interval of the image:
 -0.040  48.976 (delta_t =  49.016 [sec])
Background time interval of the image:
-129.315  -0.040 (delta_t = 129.275 [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   -0.040 sec. to   48.976 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51013     ( -0.290789   0.28611 )
Norm@50keV  : 1.33004E-03    ( -0.000209833   0.000207645 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.83 using 59 PHA bins.
# Reduced chi-squared =         0.9093 for     57 degrees of freedom 
# Null hypothesis probability =   6.687945e-01
 
Photon flux (15-150 keV)    in 49.02 sec: 0.166502 ( -0.026304  0.026428 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17578e-07 ( -1.06011e-07  1.07046e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.040 sec. to   48.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52043     ( -0.282822   0.486457 )
Epeak [keV] : 9999.32      ( -9999.36 -9999.36 )
Norm@50keV  : 1.32614E-03    ( -0.000207774   0.000700642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.85 using 59 PHA bins.
# Reduced chi-squared =         0.9258 for     56 degrees of freedom 
# Null hypothesis probability =   6.327858e-01
 
Photon flux (15-150 keV)    in 49.02 sec: 0.166860 ( -0.026989  0.026298 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.21147e-07 ( -1.46366e-07  1.40885e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    3.704 sec. to    4.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.79993     ( -0.442514   0.404605 )
Norm@50keV  : 5.65788E-03    ( -0.00160882   0.00155086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.44 using 59 PHA bins.
# Reduced chi-squared =         0.8148 for     57 degrees of freedom 
# Null hypothesis probability =   8.398090e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.779664 ( -0.191377  0.191532 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.20955e-08 ( -1.45904e-08  1.50489e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    3.704 sec. to    4.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.887351     ( -1.2663   2.98843 )
Epeak [keV] : 53.2849      ( -45.468 -53.2849 )
Norm@50keV  : 1.84944E-02    ( -0.0184943   1.24023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.58 using 59 PHA bins.
# Reduced chi-squared =         0.8139 for     56 degrees of freedom 
# Null hypothesis probability =   8.387034e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.761222 ( -0.194512  0.194605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.83682e-08 ( -1.57305e-08  1.65296e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 45.904 sec.
Hardness ratio (energy fluence ratio) = 1.40433298846

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

S(15-50 keV)  = 2.3753479e-07
S(50-150 keV) = 3.800392e-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 = 7.779330831607052E-01, IMY = 1.794501499320349E-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:
-129.315410 -0.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.3367  38.3233   10.6  51.2   -3.4   0.3314   1.1    7.8	Cyg X-2                       
350.9316  -1.9010    2.5  11.9  -63.9   0.6072   4.6  555.8	UNKNOWN                       
  5.3267 -38.1164    2.7  37.7 -150.1   0.8383   4.2 ------	UNKNOWN                       

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

Time interval of the image:
-0.040000 48.976000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1744  38.3229   56.9  51.3   -3.5  -0.0391  -0.2    0.1	Cyg X-2                       
341.9749  46.6029    2.3  50.4   14.8   1.2051   4.9 ------	UNKNOWN                       
342.5822  42.7837    3.1  46.9   13.0   0.6813   3.7 ------	UNKNOWN                       
332.8573  25.1839    1.1  38.6  -13.0   1.0991  10.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
-239.616000 358.384000
360.384000 838.180300
840.384000 962.385800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1194  38.4988    0.0  51.4   -3.4   2.2036   1.4   10.9	Cyg X-2                       
 36.1993  10.1333    3.5  35.0  104.7   5.5229   3.3 ------	UNKNOWN                       
 43.6160 -44.3819    4.0  56.9  179.3  13.9138   2.9 ------	UNKNOWN                       
352.5951 -20.9289    2.7  22.7 -121.7   2.9292   4.2 ------	UNKNOWN                       
  0.9180 -46.3218    4.4  45.9 -145.1   4.1472   2.6 ------	UNKNOWN                       
343.7865 -45.5161    4.0  48.1 -129.0  10.5116   2.9 ------	UNKNOWN