GRB191101A: 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 Nov 27 11:56:56 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger932742
======================================================================

  Trigger: 00932742      Segment: 000

  BAT Trigger Time: 594335307.2   [s; MET]
      Trigger Stop: 594335309.248   [s; MET]
               UTC: 2019-11-01T21:08:03.350920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.844271456864   Dec: 43.7542036411452  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.15
     Image Trigger?:     NO
     Rate S/N Ratio:     8.24621125123532  [ if not an image trigger ]
     Image S/N Ratio:    7.15

  Analysis Position:   [ source = BAT ]
    RA: 251.844271456864   Dec: 43.7542036411452  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 251.853907832996   Dec: 43.741941831711  [deg; J2000]  
        { 16h 47m 24.9s , +43d 44' 31.0" }
         +/- 1.56110456999774 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.661067071435162 [arcmin] (formal 1-sigma fit error)
    SNR: 16.0985573261819
 
  Angular difference between the analysis and refined position is 0.846000 arcmin
 
  Partial Coding Fraction: 0.4726562    [ including projection effects ]

  Duration
     T90: 142.707999944687 +/- 18.247231101651
        Measured from: -16.4800000190735
                   to: 126.227999925613     [s; relative to TRIGTIME]
     T50: 68.0080000162125 +/- 29.4991776124459
        Measured from: 0.423999905586243
                   to: 68.4319999217987     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.992000102996826     
                   to: 0.00799989700317383     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -21.2440000772476     
                   to: 143.503999948502     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.964490   1.212917   0.823541   0.115957
           0.104280   0.107859   0.095190   0.085805 [error]
 Peak      0.040809   0.075055   0.019797   0.005138
           0.010228   0.010834   0.010046   0.008897 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  164.748  -21.244  143.504
T90   142.708  -16.480  126.228
T50    68.008    0.424   68.432
Peak    1.000   -0.992    0.008
 
 
====== 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      -1.732    -0.185      0.179       -           -               -         1.22e-03     -1.37e-04          1.35e-04      44.790   57
CPL     -1.441    -0.457      0.804       89.645     -66.026       -89.645      1.75e-03     -6.51e-04          2.90e-03      44.290   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      -1.993     -0.395     0.350       -           -               -         8.85e-03     -2.37e-03          2.29e-03      43.660   57
CPL     -0.101     -1.854     2.840       41.404     -12.452        24.640      1.10e-01     -1.10e-01          4.72e+00      40.660   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   3.20e-07  5.11e-07  6.15e-07  1.45e-06  1.86e-06  2.89e-06   erg/cm2
      90%_error_low -4.98e-08 -5.14e-08 -9.24e-08 -4.04e-07 -2.15e-07 -4.98e-07   erg/cm2
      90%_error_hi   5.16e-08  5.14e-08  9.24e-08  4.96e-07  2.18e-07  5.70e-07   erg/cm2
Peak flux       PL   5.86e-01  4.41e-01  2.22e-01  1.60e-01  1.32e+00  1.41e+00   ph/cm2/s
      90%_error_low -1.59e-01 -9.13e-02 -7.45e-02 -8.26e-02 -2.71e-01 -2.93e-01   ph/cm2/s
      90%_error_hi   1.67e-01  9.11e-02  7.71e-02  1.21e-01  2.71e-01  2.95e-01   ph/cm2/s
 
Fluence        CPL   3.08e-07  5.29e-07  6.21e-07  8.98e-07  1.82e-06  2.36e-06   erg/cm2
      90%_error_low -5.80e-08 -6.39e-08 -9.67e-08 -5.85e-07 -2.43e-07 -6.44e-07   erg/cm2
      90%_error_hi   5.79e-08  6.81e-08  9.78e-08  1.02e-06  2.43e-07  7.39e-07   erg/cm2
Peak flux      CPL   4.88e-01  5.39e-01  2.12e-01  2.24e-02  1.26e+00  1.26e+00   ph/cm2/s
      90%_error_low -2.01e-01 -1.32e-01 -9.73e-02 -2.24e-02 -2.77e-01 -2.78e-01   ph/cm2/s
      90%_error_hi   1.99e-01  1.37e-01  9.54e-02  1.33e-01  2.78e-01  2.86e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  251.8539    43.7419   0.0119    40.7678   172.7360         2.4382257     16.099 TRIG_00932742                 
 
Foreground time interval of the image:
-21.244  25.101 (delta_t =  46.345 [sec])
Background time interval of the image:
-239.200 -21.244 (delta_t = 217.956 [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  -21.244 sec. to  143.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73237     ( -0.185004   0.17918 )
Norm@50keV  : 1.22423E-03    ( -0.000136717   0.000134527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.79 using 59 PHA bins.
# Reduced chi-squared =         0.7857 for     57 degrees of freedom 
# Null hypothesis probability =   8.798239e-01
 
Photon flux (15-150 keV)    in 164.7 sec: 0.164481 ( -0.016657  0.016673 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86279e-06 ( -2.14993e-07  2.17738e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -21.244 sec. to  143.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44117     ( -0.457351   0.803572 )
Epeak [keV] : 89.6449      ( -66.0262 -89.6454 )
Norm@50keV  : 1.75281E-03    ( -0.00065068   0.00290102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.29 using 59 PHA bins.
# Reduced chi-squared =         0.7910 for     56 degrees of freedom 
# Null hypothesis probability =   8.707625e-01
 
Photon flux (15-150 keV)    in 164.7 sec: 0.162433 ( -0.017417  0.017349 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81625e-06 ( -2.42577e-07  2.4331e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.992 sec. to    0.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99275     ( -0.395529   0.349767 )
Norm@50keV  : 8.85271E-03    ( -0.00237402   0.00228818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.66 using 59 PHA bins.
# Reduced chi-squared =         0.7660 for     57 degrees of freedom 
# Null hypothesis probability =   9.029700e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.32359 ( -0.27144  0.27145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.16263e-08 ( -2.00916e-08  2.09106e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.992 sec. to    0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.101245     ( -1.85426   2.83976 )
Epeak [keV] : 41.4038      ( -12.4523 24.6396 )
Norm@50keV  : 0.109894    ( -0.109885   4.71651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.66 using 59 PHA bins.
# Reduced chi-squared =         0.7261 for     56 degrees of freedom 
# Null hypothesis probability =   9.385814e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.25911 ( -0.276614  0.27782 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.17034e-08 ( -1.81595e-08  2.17984e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 142.708 sec.
Hardness ratio (energy fluence ratio) = 1.20384353959

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

S(15-50 keV)  = 8.312979e-07
S(50-150 keV) = 1.0315044e-06

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 = -8.552778944758745E-01, IMY = -1.090181345441954E-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:
-239.200000 -21.244000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5320  35.2186    7.4  44.9 -175.8   0.6850   1.6    8.3	Her X-1                       
167.8192  74.8565    3.1  40.8   98.2   3.4062   3.8 ------	UNKNOWN                       
242.8924  59.4919    2.6  36.4  146.8   1.8334   4.5 ------	UNKNOWN                       
201.9792  48.3628    2.7  12.0  121.6   1.0122   4.2 ------	UNKNOWN                       
198.2055  14.1752    2.8  22.5  -69.7   1.2728   4.2 ------	UNKNOWN                       

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

Time interval of the image:
-21.244000 25.100600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5285  35.3413   17.6  44.8 -176.0   0.1084   0.7    3.5	Her X-1                       
251.8539  43.7420    0.7  40.8  172.7   2.4377  16.1 ------	UNKNOWN                       
268.9665  29.0539    2.1  58.5 -174.8   3.3659   5.5 ------	UNKNOWN                       
168.5541   0.5492    2.3  45.4  -25.8   0.8542   5.0 ------	UNKNOWN                       
201.4157  -4.5852    3.0  41.3  -74.7   1.4231   3.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
87.900590 962.870400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3138  35.2454   14.2   8.8 -140.5   0.7103   0.8    9.1	Her X-1                       
268.3414  -1.2973    0.0  47.4 -149.8   2.6407   1.1    9.5	SW J1753.5-0127               
288.7902  11.0141    9.3  45.7  177.3   2.3947   1.2    4.1	GRS 1915+105                  
299.6028  35.2001    1.2  37.3  139.5  19.1964  10.0    0.6	Cyg X-1                       
308.1160  40.9302    9.0  40.9  126.7   4.0269   1.3    1.4	Cyg X-3                       
311.9691  37.4953    2.4  45.1  129.3  21.2015   4.7 ------	UNKNOWN