GRB160716A: 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: Sun Jul 31 21:04:28 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger704572
======================================================================

  Trigger: 00704572      Segment: 000

  BAT Trigger Time: 490324126.592   [s; MET]
      Trigger Stop: 490324128.64   [s; MET]
               UTC: 2016-07-16T01:08:30.026020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 190.54362714462   Dec: -61.3659454743721  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.92
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0332963783729  [ if not an image trigger ]
     Image S/N Ratio:    8.92

  Analysis Position:   [ source = BAT ]
    RA: 190.54362714462   Dec: -61.3659454743721  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 190.502425295578   Dec: -61.3645114902404  [deg; J2000]  
        { 12h 42m 00.6s , -61d 21' 52.2" }
         +/- 2.03500228609883 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.876984784121687 [arcmin] (formal 1-sigma fit error)
    SNR: 11.0232936796401
 
  Angular difference between the analysis and refined position is 1.187817 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 6.39199995994568 +/- 0.575013070049184
        Measured from: -0.0160000324249268
                   to: 6.37599992752075     [s; relative to TRIGTIME]
     T50: 4.33999991416931 +/- 1.3403238333232
        Measured from: 1.14800000190735
                   to: 5.48799991607666     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.948000013828278     
                   to: 1.94800001382828     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.431999981403351     
                   to: 6.72799998521805     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.166673   0.136340   0.055228   0.017314
           0.018497   0.018482   0.015483   0.013329 [error]
 Peak      0.038399   0.035696   0.019177   0.002719
           0.007055   0.006976   0.005936   0.004870 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    7.160   -0.432    6.728
T90     6.392   -0.016    6.376
T50     4.340    1.148    5.488
Peak    1.000    0.948    1.948
 
 
====== 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      -2.295    -0.321      0.287       -           -               -         2.66e-03     -5.83e-04          5.65e-04      55.190   57
CPL     -2.378    -0.382      1.482      184.185      N/A           N/A         2.37e-03        N/A               N/A         55.180   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      -2.058     -0.395     0.353       -           -               -         5.34e-03     -1.45e-03          1.40e-03      54.970   57
CPL     -1.190     -0.925     2.435       34.999      N/A           N/A         1.85e-02        N/A               N/A         54.140   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   5.16e-08  5.87e-08  4.78e-08  6.51e-08  1.82e-07  2.23e-07   erg/cm2
      90%_error_low -9.21e-09 -8.85e-09 -1.38e-08 -3.04e-08 -3.14e-08 -5.02e-08   erg/cm2
      90%_error_hi   9.39e-09  8.63e-09  1.48e-08  4.48e-08  3.28e-08  6.12e-08   erg/cm2
Peak flux       PL   3.77e-01  2.73e-01  1.31e-01  8.90e-02  8.23e-01  8.70e-01   ph/cm2/s
      90%_error_low -9.78e-02 -5.52e-02 -4.47e-02 -4.64e-02 -1.63e-01 -1.75e-01   ph/cm2/s
      90%_error_hi   1.01e-01  5.48e-02  4.70e-02  7.01e-02  1.63e-01  1.76e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -9.21e-09 -8.85e-09 -1.38e-08 -3.04e-08 -3.14e-08 -5.02e-08   erg/cm2
      90%_error_hi   9.39e-09  8.63e-09  1.48e-08  4.48e-08  3.28e-08  6.12e-08   erg/cm2
Peak flux      CPL   3.61e-01  3.03e-01  1.21e-01  2.46e-02  8.04e-01  8.09e-01   ph/cm2/s
      90%_error_low -1.07e-01     N/A   -6.88e-02 -2.46e-02 -1.65e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   1.07e-01     N/A    5.52e-02  1.13e-01  1.66e-01  2.13e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  190.5024   -61.3645   0.0174    19.1094    69.1526         0.3857947     11.023 TRIG_00704572                 
 
Foreground time interval of the image:
 -0.432   6.728 (delta_t =   7.160 [sec])
Background time interval of the image:
-239.592  -0.432 (delta_t = 239.160 [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   -0.432 sec. to    6.728 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.295     ( -0.321061   0.286641 )
Norm@50keV  : 2.65942E-03    ( -0.000582896   0.000564534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.19 using 59 PHA bins.
# Reduced chi-squared =         0.9683 for     57 degrees of freedom 
# Null hypothesis probability =   5.430970e-01
 
Photon flux (15-150 keV)    in 7.16 sec: 0.463524 ( -0.062965  0.062955 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81833e-07 ( -3.14487e-08  3.27634e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.432 sec. to    6.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.37759     ( -0.382137   1.48173 )
Epeak [keV] : 184.185      (   )
Norm@50keV  : 2.37028E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.18 using 59 PHA bins.
# Reduced chi-squared =         0.9854 for     56 degrees of freedom 
# Null hypothesis probability =   5.058794e-01
 
Photon flux (15-150 keV)    in 7.16 sec: 0.463903 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.948 sec. to    1.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05846     ( -0.395339   0.353111 )
Norm@50keV  : 5.33889E-03    ( -0.00145209   0.00140168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9643 for     57 degrees of freedom 
# Null hypothesis probability =   5.517902e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.823202 ( -0.162796  0.1628 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.94333e-08 ( -1.19817e-08  1.25422e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.948 sec. to    1.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19035     ( -0.92554   2.43474 )
Epeak [keV] : 34.9989      (   )
Norm@50keV  : 1.84756E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.14 using 59 PHA bins.
# Reduced chi-squared =         0.9668 for     56 degrees of freedom 
# Null hypothesis probability =   5.455847e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.804142 ( -0.16493  0.16628 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 6.392 sec.
Hardness ratio (energy fluence ratio) = 0.81509841922

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

S(15-50 keV)  = 1.1025966e-07
S(50-150 keV) = 7.157415e-08

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 = 1.233001940051703E-01, IMY = -3.237821380274112E-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:
-239.592000 -0.432000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5530 -40.5615    0.6  20.7  -84.8   4.7719  19.2    1.2	Vela X-1                      
170.6166 -60.6673   14.4   9.5   65.9   0.1814   0.8    9.2	Cen X-3                       
186.9093 -62.6552    3.7  17.3   72.8   0.7242   3.1    9.8	GX 301-2                      
160.2440 -18.7106    3.3  40.0  -34.7   1.0915   3.5 ------	UNKNOWN                       
103.8764 -29.2457    2.5  44.0 -116.6   4.2974   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-0.432000 6.728000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6408 -40.5008    2.5  20.7  -84.6   0.1652   4.6    6.1	Vela X-1                      
170.6748 -60.5559    9.8   9.5   65.3  -0.0359  -1.2   11.3	Cen X-3                       
186.6019 -62.6121    4.7  17.2   72.7  -0.0819  -2.5    9.6	GX 301-2                      
190.5015 -61.3648    1.0  19.1   69.2   0.3859  11.2 ------	UNKNOWN                       
170.3790 -30.1017    2.7  30.8  -14.8   0.1395   4.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
69.708590 772.208590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4973 -40.5537    0.9  38.8 -106.8  20.8662  13.1    1.4	Vela X-1                      
170.2406 -60.6034    3.5   9.8 -117.8   1.6842   3.3    2.5	Cen X-3                       
186.4200 -62.6525   21.9   2.3 -149.0   0.2936   0.5    9.6	GX 301-2                      
214.4625 -28.7850    2.6  36.2   13.7   2.9458   4.4 ------	UNKNOWN                       
 39.9454 -59.6702    2.9  56.9  174.0  15.1668   4.0 ------	UNKNOWN                       
187.7613  -3.9415    2.9  57.5  -26.5  13.2305   4.0 ------	UNKNOWN                       
111.9358 -43.1335    2.9  48.0 -129.0  10.6776   4.0 ------	UNKNOWN