GRB191001B: 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 12:23:32 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger927345
======================================================================

  Trigger: 00927345      Segment: 000

  BAT Trigger Time: 591643184   [s; MET]
      Trigger Stop: 591643264   [s; MET]
               UTC: 2019-10-01T17:19:20.323880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 86.3680994408955   Dec: -15.907114841062  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.15
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    14.15

  Analysis Position:   [ source = BAT ]
    RA: 86.3680994408955   Dec: -15.907114841062  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 86.358291966374   Dec: -15.8959040481071  [deg; J2000]  
        { 05h 45m 26.0s , -15d 53' 45.3" }
         +/- 3.29283949968069 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.86814348552477 [arcmin] (formal 1-sigma fit error)
    SNR: 5.5428338658496
 
  Angular difference between the analysis and refined position is 0.879052 arcmin
 
  Partial Coding Fraction: 0.3476562    [ including projection effects ]

  Duration
     T90: 107.136000037193 +/- 9.35435393365479
        Measured from: 8.32799994945526
                   to: 115.463999986649     [s; relative to TRIGTIME]
     T50: 58.7200000286102 +/- 12.2856769083603
        Measured from: 36.5360000133514
                   to: 95.2560000419617     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 20.5720000267029     
                   to: 21.5720000267029     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 4.72800004482269     
                   to: 126.120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.812030   2.294811   2.145350   0.429247
           0.130195   0.135403   0.117351   0.100423 [error]
 Peak      0.039226   0.061586   0.080263   0.033283
           0.012651   0.013702   0.012810   0.009906 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  121.392    4.728  126.120
T90   107.136    8.328  115.464
T50    58.720   36.536   95.256
Peak    1.000   20.572   21.572
 
 
====== 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      -1.569    -0.106      0.105       -           -               -         3.90e-03     -2.32e-04          2.32e-04      50.150   57
CPL     -1.194    -0.404      0.444      116.943     -36.587      -116.943      5.84e-03     -2.00e-03          3.44e-03      47.660   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      -0.971     -0.315     0.348       -           -               -         1.47e-02     -3.00e-03          2.88e-03      54.660   57
CPL     -0.978     -0.304     0.462     9999.360    -9999.360      -9999.360      1.49e-02     -2.82e-03          2.88e-02      54.670   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   6.44e-07  1.13e-06  1.53e-06  4.24e-06  4.44e-06  7.55e-06   erg/cm2
      90%_error_low -6.84e-08 -7.37e-08 -1.15e-07 -6.57e-07 -2.79e-07 -7.43e-07   erg/cm2
      90%_error_hi   7.09e-08  7.33e-08  1.14e-07  7.32e-07  2.80e-07  8.00e-07   erg/cm2
Peak flux       PL   3.66e-01  5.05e-01  5.15e-01  9.58e-01  1.69e+00  2.34e+00   ph/cm2/s
      90%_error_low -1.45e-01 -1.37e-01 -9.25e-02 -3.26e-01 -3.44e-01 -4.23e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.33e-01  9.22e-02  4.24e-01  3.47e-01  4.30e-01   ph/cm2/s
 
Fluence        CPL   5.93e-07  1.17e-06  1.59e-06  2.66e-06  4.36e-06  6.00e-06   erg/cm2
      90%_error_low -8.64e-08 -8.25e-08 -1.30e-07 -9.98e-07 -2.95e-07 -1.03e-06   erg/cm2
      90%_error_hi   8.86e-08  8.38e-08  1.33e-07  1.80e-06  2.95e-07  1.70e-06   erg/cm2
Peak flux      CPL   3.65e-01  5.05e-01  5.16e-01  9.53e-01  1.69e+00  2.34e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   86.3583   -15.8959   0.0346    45.7002     9.2192         2.5314555      5.543 TRIG_00927345                 
 
Foreground time interval of the image:
  4.728  84.701 (delta_t =  79.973 [sec])
Background time interval of the image:
-14.299   4.728 (delta_t =  19.027 [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    4.728 sec. to  126.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5685     ( -0.105565   0.104921 )
Norm@50keV  : 3.89501E-03    ( -0.000232412   0.000231986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.15 using 59 PHA bins.
# Reduced chi-squared =         0.8798 for     57 degrees of freedom 
# Null hypothesis probability =   7.278005e-01
 
Photon flux (15-150 keV)    in 121.4 sec: 0.495781 ( -0.031428  0.031533 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44067e-06 ( -2.79273e-07  2.80384e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.728 sec. to  126.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19351     ( -0.404027   0.444357 )
Epeak [keV] : 116.943      ( -36.5879 -116.944 )
Norm@50keV  : 5.83834E-03    ( -0.00200393   0.00343839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.66 using 59 PHA bins.
# Reduced chi-squared =         0.8511 for     56 degrees of freedom 
# Null hypothesis probability =   7.784093e-01
 
Photon flux (15-150 keV)    in 121.4 sec: 0.485060 ( -0.033358  0.03351 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.35832e-06 ( -2.94836e-07  2.9474e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   20.572 sec. to   21.572 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.970711     ( -0.315244   0.348315 )
Norm@50keV  : 1.47197E-02    ( -0.00299972   0.00287535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.66 using 59 PHA bins.
# Reduced chi-squared =         0.9590 for     57 degrees of freedom 
# Null hypothesis probability =   5.632267e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.69236 ( -0.34375  0.34746 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60872e-07 ( -2.8937e-08  2.89253e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   20.572 sec. to   21.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.977598     ( -0.308631   0.457648 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.48529E-02    ( -0.00278271   0.0288596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.67 using 59 PHA bins.
# Reduced chi-squared =         0.9763 for     56 degrees of freedom 
# Null hypothesis probability =   5.252047e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.69198 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60898e-07 ( -2.99316e-08  2.98808e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 107.136 sec.
Hardness ratio (energy fluence ratio) = 1.3486834336

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

S(15-50 keV)  = 1.7785796e-06
S(50-150 keV) = 2.662166e-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 = 1.011508696785040E+00, IMY = -1.641761883052652E-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:
-14.299410 4.728000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6064  22.0354    0.8  17.4   64.7   0.7900  14.4    2.0	Crab                          
100.4783  56.7636    2.6  29.6  166.4   0.2611   4.4 ------	UNKNOWN                       
101.7745  29.2472    2.9   2.0  164.0   0.1884   3.9 ------	UNKNOWN                       

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

Time interval of the image:
4.728000 84.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4819  22.1723    0.0  17.5   65.3  -0.1530  -0.7   12.7	Crab                          
 63.8472  -1.6509    2.4  46.7   46.0   4.5446   4.7 ------	UNKNOWN                       
 80.1918  10.7278    1.9  26.3   43.4   1.5596   6.1 ------	UNKNOWN                       
 86.3583 -15.8959    2.1  45.7    9.2   2.5322   5.5 ------	UNKNOWN                       
113.4534  75.8653    2.1  49.0  171.8   3.3098   5.5 ------	UNKNOWN                       
133.1010  50.5081    3.4  33.2 -155.0   0.9724   3.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
97.500600 196.900610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6223  22.0165    0.4  16.0   67.8   4.1472  28.5    0.6	Crab                          
 85.0146  -1.2216    2.8  31.1   20.0   0.7227   4.2 ------	UNKNOWN                       
 86.3742 -15.9371    1.7  44.2    8.5   1.6065   6.9 ------	UNKNOWN