GRB161104A

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 Dec  4 22:29:22 EST 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger720568
======================================================================

  Trigger: 00720568      Segment: 000

  BAT Trigger Time: 499945363.984   [s; MET]
      Trigger Stop: 499945364.048   [s; MET]
               UTC: 2016-11-04T09:42:26.875480    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 77.8806169009489   Dec: -51.4523657373836  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.2
     Image Trigger?:     NO
     Rate S/N Ratio:     27.258026340878  [ if not an image trigger ]
     Image S/N Ratio:    9.2

  Analysis Position:   [ source = BAT ]
    RA: 77.8806169009489   Dec: -51.4523657373836  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 77.9030526857047   Dec: -51.4487398548717  [deg; J2000]  
        { 05h 11m 36.7s , -51d 26' 55.5" }
         +/- 1.78147768819737 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.898964149695442 [arcmin] (formal 1-sigma fit error)
    SNR: 13.330937232487
 
  Angular difference between the analysis and refined position is 0.866655 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 0.0999999642372131 +/- 0.0178885267601734
        Measured from: -0.0120000243186951
                   to: 0.0879999399185181     [s; relative to TRIGTIME]
     T50: 0.043999969959259 +/- 0.0178885267601734
        Measured from: 0.0119999647140503
                   to: 0.0559999346733093     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.456000030040741     
                   to: 0.543999969959259     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0160000324249268     
                   to: 0.0999999642372131     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.012951   0.024277   0.022909   0.007942
           0.002427   0.002906   0.002901   0.001998 [error]
 Peak      0.017723   0.028626   0.021330   0.005245
           0.005477   0.006068   0.005267   0.004294 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.116   -0.016    0.100
T90     0.100   -0.012    0.088
T50     0.044    0.012    0.056
Peak    1.000   -0.456    0.544
 
 
====== 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      -1.135    -0.220      0.220       -           -               -         3.54e-02     -4.59e-03          4.59e-03      60.260   57
CPL     -0.938    -0.553      0.922      297.134    -297.134      -297.134      4.39e-02     -1.92e-02          7.00e-02      60.080   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      -1.294     -0.393     0.396       -           -               -         4.92e-03     -1.10e-03          1.09e-03      57.900   57
CPL     -1.182     -2.607     1.534      369.151    -369.151      -369.151      5.61e-03     -1.76e-03          2.51e-02      57.940   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   3.73e-09  8.57e-09  1.56e-08  6.77e-08  4.25e-08  9.56e-08   erg/cm2
      90%_error_low -8.45e-10 -1.24e-09 -2.49e-09 -2.09e-08 -6.31e-09 -2.30e-08   erg/cm2
      90%_error_hi   8.96e-10  1.22e-09  2.45e-09  2.62e-08  6.36e-09  2.75e-08   erg/cm2
Peak flux       PL   1.66e-01  1.89e-01  1.54e-01  2.10e-01  5.86e-01  7.20e-01   ph/cm2/s
      90%_error_low -6.22e-02 -4.65e-02 -4.28e-02 -1.00e-01 -1.30e-01 -1.66e-01   ph/cm2/s
      90%_error_hi   6.87e-02  4.52e-02  4.17e-02  1.45e-01  1.30e-01  1.73e-01   ph/cm2/s
 
Fluence        CPL   3.58e-09  8.75e-09  1.60e-08  5.13e-08  4.21e-08  7.96e-08   erg/cm2
      90%_error_low -1.04e-09 -1.36e-09 -2.77e-09 -3.32e-08 -6.55e-09 -3.36e-08   erg/cm2
      90%_error_hi   1.01e-09  1.45e-09  2.95e-09  2.20e-08  6.50e-09  3.52e-08   erg/cm2
Peak flux      CPL   1.67e-01  1.88e-01  1.54e-01  2.19e-01  5.87e-01  7.31e-01   ph/cm2/s
      90%_error_low -7.48e-02 -4.62e-02 -4.26e-02     N/A   -1.34e-01 -2.47e-01   ph/cm2/s
      90%_error_hi   3.81e-02  5.52e-02  4.89e-02     N/A    1.30e-01  1.53e-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
   77.9031   -51.4487   0.0145    13.0205  -142.1228         0.0680245     13.331 TRIG_00720568                 
 
Foreground time interval of the image:
 -0.016   0.100 (delta_t =   0.116 [sec])
Background time interval of the image:
-239.984  -0.016 (delta_t = 239.968 [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

Bokeh Plot

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   -0.016 sec. to    0.100 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13516     ( -0.219633   0.220442 )
Norm@50keV  : 3.53978E-02    ( -0.00459462   0.00458888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.26 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     57 degrees of freedom 
# Null hypothesis probability =   3.588421e-01
 
Photon flux (15-150 keV)    in 0.116 sec: 4.12103 ( -0.53778  0.53805 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.24656e-08 ( -6.31316e-09  6.36451e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.016 sec. to    0.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.937747     ( -0.553148   0.922177 )
Epeak [keV] : 297.134      ( -297.119 -297.119 )
Norm@50keV  : 4.38772E-02    ( -0.0192453   0.0699647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.08 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     56 degrees of freedom 
# Null hypothesis probability =   3.302399e-01
 
Photon flux (15-150 keV)    in 0.116 sec: 1.63711 ( -0.5448  0.3203 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.21248e-08 ( -6.55039e-09  6.49776e-09 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.456 sec. to    0.544 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29364     ( -0.392605   0.395609 )
Norm@50keV  : 4.92009E-03    ( -0.00109806   0.00109045 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.90 using 59 PHA bins.
# Reduced chi-squared =          1.016 for     57 degrees of freedom 
# Null hypothesis probability =   4.418647e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.586304 ( -0.129934  0.130106 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87012e-08 ( -1.22728e-08  1.25169e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.456 sec. to    0.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29004     ( -2.59393   1.54684 )
Epeak [keV] : 9998.02      ( -9998.29 -9998.29 )
Norm@50keV  : 4.94105E-03    ( -0.0010957   0.0258074 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.90 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.049926e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.587162 ( -0.133835  0.130161 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.8745e-08 ( -1.32906e-08  1.07157e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.09999996 sec.
Hardness ratio (energy fluence ratio) = 1.82116724562

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

S(15-50 keV)  = 1.2303988e-08
S(50-150 keV) = 3.016174e-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 = -1.825277241681918E-01, IMY = 1.419771635243132E-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:
-239.984000 -0.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5084 -40.6003    3.4  53.3 -142.9   3.9553   3.4    2.9	Vela X-1                      
 37.0915 -17.5634    2.6  35.0   66.9   1.7765   4.5 ------	UNKNOWN                       
 48.8785 -25.9715    2.9  23.1   81.7   0.9839   4.1 ------	UNKNOWN                       
351.4681 -51.6341    3.4  42.0  -16.9   0.8678   3.4 ------	UNKNOWN                       
116.1828 -36.5971    2.0  43.1 -158.7   1.9799   5.7 ------	UNKNOWN                       
331.6733 -40.7188    2.8  59.3  -13.9   4.7258   4.1 ------	UNKNOWN                       
135.8689 -41.1904    2.8  53.2 -142.1   4.3782   4.2 ------	UNKNOWN

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

Time interval of the image:
-0.016000 0.100000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6428 -40.7572    4.0  53.3 -142.6   0.0764   2.9   13.2	Vela X-1                      
 77.9031 -51.4487    0.9  13.0 -142.1   0.0680  13.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
46.716610 302.346000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6078 -40.5604    3.5  40.4 -134.1   1.3078   3.3    3.6	Vela X-1

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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