GRB161001A: 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 17:15:47 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger714404
======================================================================

  Trigger: 00714404      Segment: 000

  BAT Trigger Time: 496976733.628   [s; MET]
      Trigger Stop: 496976733.692   [s; MET]
               UTC: 2016-10-01T01:05:16.687760    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 71.9131924986459   Dec: -57.2827127678074  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.36
     Image Trigger?:     NO
     Rate S/N Ratio:     16.2172747402269  [ if not an image trigger ]
     Image S/N Ratio:    7.36

  Analysis Position:   [ source = BAT ]
    RA: 71.9131924986459   Dec: -57.2827127678074  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 71.9222104671082   Dec: -57.260585966451  [deg; J2000]  
        { 04h 47m 41.3s , -57d 15' 38.1" }
         +/- 0.967145083026576 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.321293110775108 [arcmin] (formal 1-sigma fit error)
    SNR: 31.9039624451639
 
  Angular difference between the analysis and refined position is 1.359456 arcmin
 
  Partial Coding Fraction: 0.7890625    [ including projection effects ]

  Duration
     T90: 2.59999996423721 +/- 0.385351784372164
        Measured from: -0.108000040054321
                   to: 2.49199992418289     [s; relative to TRIGTIME]
     T50: 1.24799996614456 +/- 0.139714010500827
        Measured from: 0.519999980926514
                   to: 1.76799994707108     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.36799997091293     
                   to: 2.36799997091293     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.216000020503998     
                   to: 3.10399997234344     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.192785   0.334862   0.346782   0.103096
           0.014987   0.016564   0.015584   0.012379 [error]
 Peak      0.072907   0.140867   0.185930   0.054691
           0.008692   0.010019   0.010024   0.007934 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.320   -0.216    3.104
T90     2.600   -0.108    2.492
T50     1.248    0.520    1.768
Peak    1.000    1.368    2.368
 
 
====== 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      -1.073    -0.090      0.091       -           -               -         1.97e-02     -9.95e-04          9.94e-04      56.460   57
CPL     -0.841    -0.271      0.366      282.469    -282.469      -282.469      2.51e-02     -5.97e-03          1.11e-02      55.100   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      -0.806     -0.119     0.121       -           -               -         3.00e-02     -2.05e-03          2.03e-03      38.470   57
CPL     -0.572     -0.339     0.506      375.703    -375.703      -375.703      3.74e-02     -8.95e-03          2.18e-02      37.710   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   5.60e-08  1.34e-07  2.54e-07  1.18e-06  6.89e-07  1.62e-06   erg/cm2
      90%_error_low -5.65e-09 -8.12e-09 -1.48e-08 -1.50e-07 -3.83e-08 -1.59e-07   erg/cm2
      90%_error_hi   5.85e-09  8.06e-09  1.47e-08  1.66e-07  3.84e-08  1.72e-07   erg/cm2
Peak flux       PL   6.37e-01  9.71e-01  1.11e+00  2.43e+00  3.44e+00  5.15e+00   ph/cm2/s
      90%_error_low -9.16e-02 -8.69e-02 -7.65e-02 -3.58e-01 -2.31e-01 -3.95e-01   ph/cm2/s
      90%_error_hi   9.71e-02  8.61e-02  7.62e-02  3.98e-01  2.31e-01  4.10e-01   ph/cm2/s
 
Fluence        CPL   5.30e-08  1.36e-07  2.60e-07  8.57e-07  6.80e-07  1.31e-06   erg/cm2
      90%_error_low -7.08e-09 -8.80e-09 -1.72e-08 -3.06e-07 -4.09e-08 -3.05e-07   erg/cm2
      90%_error_hi   7.35e-09  8.92e-09  1.74e-08  3.56e-07  4.07e-08  3.70e-07   erg/cm2
Peak flux      CPL   5.92e-01  9.77e-01  1.14e+00  1.95e+00  3.41e+00  4.66e+00   ph/cm2/s
      90%_error_low -1.23e-01 -8.98e-02 -9.61e-02 -6.66e-01 -2.39e-01 -7.17e-01   ph/cm2/s
      90%_error_hi   1.12e-01  8.98e-02  1.00e-01  6.00e-01  2.39e-01  6.84e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   71.9222   -57.2606   0.0060    17.9415   129.4193         1.0221112     31.904 TRIG_00714404                 
 
Foreground time interval of the image:
 -0.216   3.104 (delta_t =   3.320 [sec])
Background time interval of the image:
-214.527  -0.216 (delta_t = 214.311 [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   -0.216 sec. to    3.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07321     ( -0.0899988   0.0909707 )
Norm@50keV  : 1.96759E-02    ( -0.000995582   0.00099443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.46 using 59 PHA bins.
# Reduced chi-squared =         0.9905 for     57 degrees of freedom 
# Null hypothesis probability =   4.952590e-01
 
Photon flux (15-150 keV)    in 3.32 sec: 2.27672 ( -0.11827  0.11842 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.89013e-07 ( -3.82869e-08  3.84287e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.216 sec. to    3.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.841266     ( -0.270594   0.365882 )
Epeak [keV] : 282.469      ( -282.469 -282.469 )
Norm@50keV  : 2.50506E-02    ( -0.00596744   0.0111194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.10 using 59 PHA bins.
# Reduced chi-squared =         0.9839 for     56 degrees of freedom 
# Null hypothesis probability =   5.089405e-01
 
Photon flux (15-150 keV)    in 3.32 sec: 2.25247 ( -0.12346  0.12339 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.80125e-07 ( -4.08938e-08  4.06637e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.368 sec. to    2.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.805855     ( -0.118801   0.121423 )
Norm@50keV  : 2.99534E-02    ( -0.00204729   0.00203469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.47 using 59 PHA bins.
# Reduced chi-squared =         0.6749 for     57 degrees of freedom 
# Null hypothesis probability =   9.716330e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.44189 ( -0.23062  0.23092 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.49213e-07 ( -2.49257e-08  2.50268e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.368 sec. to    2.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.571857     ( -0.339077   0.505969 )
Epeak [keV] : 375.703      ( -375.703 -375.703 )
Norm@50keV  : 3.74240E-02    ( -0.00894768   0.0217847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.71 using 59 PHA bins.
# Reduced chi-squared =         0.6735 for     56 degrees of freedom 
# Null hypothesis probability =   9.711313e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.40940 ( -0.23931  0.23908 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.4641e-07 ( -2.5879e-08  2.57503e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 2.6 sec.
Hardness ratio (energy fluence ratio) = 1.90107899421

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

S(15-50 keV)  = 1.8982013e-07
S(50-150 keV) = 4.991868e-07

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 = -2.056050893533265E-01, IMY = -2.501358602615859E-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:
-214.527400 -0.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3659 -40.6237    6.0  36.0 -128.5  -0.7225  -1.9    8.5	Vela X-1                      
170.3698 -60.6875    2.2  29.0  -73.8   1.6881   5.2    4.2	Cen X-3                       
186.5640 -62.7399    1.6  32.1  -59.4   2.4872   7.3    3.1	GX 301-2                      
111.3227 -21.4860    2.2  50.7 -163.8   3.0259   5.3 ------	UNKNOWN                       
152.3614 -58.2989    2.5  25.3  -92.8   1.3863   4.7 ------	UNKNOWN                       
218.6153 -50.8879    2.6  50.6  -44.5   5.5692   4.4 ------	UNKNOWN                       

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

Time interval of the image:
-0.216000 3.104000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4497 -40.5826    7.1  36.1 -128.4   0.0695   1.6    4.0	Vela X-1                      
170.5279 -60.7258    4.2  29.0  -73.6   0.1073   2.7    8.8	Cen X-3                       
186.7165 -62.7671  186.7  32.1  -59.2  -0.0024  -0.1    1.7	GX 301-2                      
 71.9222 -57.2606    0.4  17.9  129.4   1.0221  31.9 ------	UNKNOWN                       
221.0546 -58.2232    2.2  44.3  -39.1   0.2703   5.3 ------	UNKNOWN                       
212.0887 -52.7779    2.7  47.3  -48.6   0.3848   4.3 ------	UNKNOWN                       
168.5659 -46.1553    3.1  40.8  -89.1   0.4077   3.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
48.872590 962.450000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 27.5949 -44.9694    3.6  29.8   71.6   3.2349   3.2 ------	UNKNOWN                       
258.9197 -71.1092    3.1  51.5  -20.6   5.6619   3.7 ------	UNKNOWN                       
264.1302 -62.9097    3.6  59.4  -17.1  13.0266   3.2 ------	UNKNOWN                       
128.7531 -32.6642    3.5  45.3 -121.3   8.2067   3.3 ------	UNKNOWN