GRB160927A: 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: Mon Oct 24 17:18:49 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger713782
======================================================================

  Trigger: 00713782      Segment: 000

  BAT Trigger Time: 496692306.816   [s; MET]
      Trigger Stop: 496692307.328   [s; MET]
               UTC: 2016-09-27T18:04:49.891880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 256.263779819621   Dec: 17.3105803857182  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.56
     Image Trigger?:     NO
     Rate S/N Ratio:     35.4400902933387  [ if not an image trigger ]
     Image S/N Ratio:    7.56

  Analysis Position:   [ source = BAT ]
    RA: 256.263779819621   Dec: 17.3105803857182  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 256.269891736109   Dec: 17.3336509789458  [deg; J2000]  
        { 17h 05m 04.8s , +17d 20' 01.1" }
         +/- 1.75859461585073 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.702257665296422 [arcmin] (formal 1-sigma fit error)
    SNR: 13.5794321582275
 
  Angular difference between the analysis and refined position is 1.427819 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 0.48799991607666 +/- 0.102449944085361
        Measured from: 0.0400000214576721
                   to: 0.527999937534332     [s; relative to TRIGTIME]
     T50: 0.235999941825867 +/- 0.0481663076306506
        Measured from: 0.168000042438507
                   to: 0.403999984264374     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.219999969005585     
                   to: 0.780000030994415     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.560000002384186     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.055284   0.057625   0.072743   0.043608
           0.009201   0.008877   0.009275   0.007823 [error]
 Peak      0.066640   0.075569   0.074261   0.041451
           0.011808   0.011071   0.010714   0.009156 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.560    0.000    0.560
T90     0.488    0.040    0.528
T50     0.236    0.168    0.404
Peak    1.000   -0.220    0.780
 
 
====== 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      -1.127    -0.256      0.259       -           -               -         2.41e-02     -3.32e-03          3.32e-03      36.010   57
CPL     -1.076    -0.308      0.777      996.080    -996.080      -996.080      2.55e-02        N/A               N/A         36.100   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      -1.291     -0.270     0.271       -           -               -         1.58e-02     -2.26e-03          2.25e-03      46.370   57
CPL     -1.287     -0.272     0.675     9999.240    -9999.240      -9999.240      1.58e-02        N/A               N/A         46.380   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   1.22e-08  2.81e-08  5.15e-08  2.25e-07  1.40e-07  3.17e-07   erg/cm2
      90%_error_low -3.20e-09 -4.57e-09 -8.70e-09 -7.64e-08 -2.19e-08 -8.27e-08   erg/cm2
      90%_error_hi   3.50e-09  4.45e-09  8.53e-09  1.01e-07  2.22e-08  1.04e-07   erg/cm2
Peak flux       PL   5.32e-01  6.06e-01  4.95e-01  6.77e-01  1.88e+00  2.31e+00   ph/cm2/s
      90%_error_low -1.42e-01 -1.01e-01 -8.80e-02 -2.29e-01 -2.75e-01 -3.44e-01   ph/cm2/s
      90%_error_hi   1.55e-01  9.84e-02  8.61e-02  2.96e-01  2.76e-01  3.52e-01   ph/cm2/s
 
Fluence        CPL   1.22e-08  2.81e-08  5.08e-08  2.38e-07  1.41e-07  3.37e-07   erg/cm2
      90%_error_low    N/A       N/A       N/A    -1.61e-07 -2.48e-08 -1.69e-07   erg/cm2
      90%_error_hi     N/A       N/A       N/A     3.59e-08  1.57e-08  2.63e-08   erg/cm2
Peak flux      CPL   4.08e-01  2.73e-01  1.25e-01  9.63e-02  8.48e-01  9.01e-01   ph/cm2/s
      90%_error_low -2.05e-01 -1.37e-01 -6.60e-02 -9.63e-02 -4.25e-01 -4.50e-01   ph/cm2/s
      90%_error_hi   1.95e-01  1.11e-01  5.34e-02  5.09e-02  3.32e-01  3.32e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  256.2699    17.3337   0.0141    26.7832    68.5176         0.2468623     13.579 TRIG_00713782                 
 
Foreground time interval of the image:
  0.000   0.560 (delta_t =   0.560 [sec])
Background time interval of the image:
-324.515 -310.456 (delta_t =  14.059 [sec])
-239.816   0.000 (delta_t = 239.816 [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    0.000 sec. to    0.560 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12708     ( -0.256314   0.258984 )
Norm@50keV  : 2.41214E-02    ( -0.0033196   0.00331934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.01 using 59 PHA bins.
# Reduced chi-squared =         0.6317 for     57 degrees of freedom 
# Null hypothesis probability =   9.865595e-01
 
Photon flux (15-150 keV)    in 0.56 sec: 2.80572 ( -0.39468  0.39582 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40048e-07 ( -2.19106e-08  2.21658e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.000 sec. to    0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12237     ( -0.307526   0.77729 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 2.42464E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.02 using 59 PHA bins.
# Reduced chi-squared =         0.6431 for     56 degrees of freedom 
# Null hypothesis probability =   9.825976e-01
 
Photon flux (15-150 keV)    in 0.56 sec: 2.82696 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41263e-07 ( -2.48239e-08  1.57294e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.220 sec. to    0.780 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29091     ( -0.26983   0.270703 )
Norm@50keV  : 1.57804E-02    ( -0.00225652   0.00225258 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.37 using 59 PHA bins.
# Reduced chi-squared =         0.8135 for     57 degrees of freedom 
# Null hypothesis probability =   8.417496e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.87954 ( -0.27457  0.27556 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56304e-07 ( -2.52893e-08  2.56409e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.220 sec. to    0.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2869     ( -0.271535   0.675006 )
Epeak [keV] : 9999.24      ( -9999.36 -9999.36 )
Norm@50keV  : 1.58106E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.38 using 59 PHA bins.
# Reduced chi-squared =         0.8282 for     56 degrees of freedom 
# Null hypothesis probability =   8.166967e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.848015 ( -0.425173  0.332255 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.01742e-08 ( -1.25618e-08  2.56105e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.4879999 sec.
Hardness ratio (energy fluence ratio) = 1.83138619513

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

S(15-50 keV)  = 4.03134e-08
S(50-150 keV) = 9.973319e-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 = 1.848539045383737E-01, IMY = -4.697017635139883E-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:
-324.515400 -310.456200
-239.816000 0.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9866 -15.6368    0.2  20.3  164.4  16.4985  53.4    0.5	Sco X-1                       
254.5190  35.3766    9.0  38.7   42.7   0.8352   1.3    3.6	Her X-1                       
255.9818 -37.8499    2.4  44.3  170.9   3.3319   4.8    0.4	4U 1700-377                   
256.3905 -36.3830    5.8  43.3  169.3  -1.4045  -2.0    3.2	GX 349+2                      
262.9099 -24.6940    4.9  38.3  150.9   1.5330   2.4    6.2	GX 1+4                        
264.6433 -44.4621    4.8  53.5  168.9  -3.3321  -2.4    4.3	4U 1735-44                    
268.4605  -1.5549    3.4  34.4  110.9  -2.2468  -3.4    8.3	SW J1753.5-0127               
270.2564 -25.0575    7.6  44.0  145.5   1.4652   1.5    2.0	GX 5-1                        
270.4392 -25.7320   18.4  44.5  146.2   0.6106   0.6    7.4	GRS 1758-258                  
274.0179 -14.1298    4.7  42.5  128.8   2.8433   2.4    5.6	GX 17+2                       
276.0199 -30.2303    5.1  51.0  147.8   3.5985   2.3    9.6	H1820-303                     
262.9848 -33.8327   71.1  44.6  161.0   0.1323   0.2    0.2	GX 354-0                      
212.9303  54.2136    2.8  55.4    0.8   4.5106   4.2 ------	UNKNOWN                       
211.7119  38.3528    2.8  42.1  -10.9   1.7996   4.2 ------	UNKNOWN                       
213.7403  19.3498    2.4  26.7  -31.5   1.5987   4.8 ------	UNKNOWN                       
236.4053 -52.6599    2.6  54.3 -166.0   4.8793   4.4 ------	UNKNOWN                       
190.3825  47.7504    2.8  59.6  -17.0   9.7949   4.1 ------	UNKNOWN                       
185.5466  40.8502    5.3  58.8  -25.9   5.4944   2.2 ------	UNKNOWN                       

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

Time interval of the image:
0.000000 0.560000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8827 -15.8274    0.0  20.4  164.9   0.0238   1.8   12.5	Sco X-1                       
254.4445  35.4434   11.0  38.7   42.5   0.0281   1.1    6.1	Her X-1                       
255.9718 -37.9397    6.9  44.4  171.0   0.0433   1.7    5.8	4U 1700-377                   
256.2828 -36.4067   34.6  43.3  169.5   0.0082   0.3    7.4	GX 349+2                      
262.9088 -24.8890    8.5  38.5  151.2  -0.0312  -1.4   10.2	GX 1+4                        
264.7400 -44.4580  349.2  53.6  168.9  -0.0019  -0.0    0.5	4U 1735-44                    
268.2864  -1.3463    5.3  34.2  110.5  -0.0624  -2.2    8.0	SW J1753.5-0127               
270.2671 -25.1989    4.4  44.1  145.7  -0.0896  -2.6    7.2	GX 5-1                        
270.1950 -25.8190    3.9  44.3  146.5  -0.1040  -3.0    7.4	GRS 1758-258                  
273.9533 -14.1911    4.7  42.5  128.9   0.1066   2.4    9.8	GX 17+2                       
275.8597 -30.2606    4.4  50.9  148.0  -0.1876  -2.7    7.2	H1820-303                     
263.0702 -33.7138    4.7  44.6  160.8  -0.0738  -2.5    8.3	GX 354-0                      
275.3409 -31.7379    2.5  51.3  149.9   0.3294   4.6 ------	UNKNOWN                       
256.2699  17.3337    0.8  26.8   68.5   0.2469  13.6 ------	UNKNOWN                       
200.5537  40.0148    2.1  49.0  -18.5   0.1348   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
63.684590 962.212800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9829 -15.6415    0.2  34.8 -152.9  57.1905  53.8    0.2	Sco X-1                       
254.5221  35.2459    1.8  18.0    3.3   5.7215   6.5    6.6	Her X-1                       
256.0763 -37.7680    4.1  55.1 -172.0  10.3430   2.8    6.2	4U 1700-377                   
256.4047 -36.5068    4.3  53.8 -172.3   8.1180   2.7    5.2	GX 349+2                      
263.1230 -24.6872   11.2  42.5  178.6   1.5756   1.0    7.1	GX 1+4                        
268.3680  -1.4526   28.3  22.3  154.1   0.4102   0.4    0.0	SW J1753.5-0127               
270.3052 -25.1359    3.7  44.6  169.6   6.5202   3.1    3.6	GX 5-1                        
270.4061 -25.5712    0.0  45.0  169.7   1.1416   0.5   11.7	GRS 1758-258                  
273.8701 -13.9226    3.7  35.8  157.6   5.2419   3.1   10.4	GX 17+2                       
276.0385 -30.3629    9.3  51.3  165.9   4.1918   1.2    5.9	H1820-303                     
284.9164 -24.9279    6.9  50.6  153.6   6.7793   1.7    6.5	HT1900.1-2455                 
288.6523  11.0689    0.0  32.0  104.7   4.3392   2.6   11.3	GRS 1915+105                  
262.9723 -33.8600    5.5  51.6 -179.3   5.8500   2.1    1.7	GX 354-0                      
297.4281  25.2991    3.8  39.0   78.8  10.3637   3.0 ------	UNKNOWN                       
280.5891  71.2252    5.3  55.8   17.1  12.7912   2.2 ------	UNKNOWN                       
271.2857 -24.1218    2.5  44.0  167.9   9.5412   4.6 ------	UNKNOWN                       
264.5920   5.2945    2.6  14.5  152.6   4.0118   4.5 ------	UNKNOWN                       
246.7178  70.8972    3.5  53.9    4.0   9.6093   3.4 ------	UNKNOWN                       
253.4304  41.1297    2.7  23.9    2.6   3.5914   4.2 ------	UNKNOWN                       
237.0298  40.9396    2.4  28.8  -23.2   4.6893   4.8 ------	UNKNOWN                       
200.9012  63.8810    2.3  59.6  -17.0  32.8276   4.9 ------	UNKNOWN                       
	UNKNOWN