GRB161007A: 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 17:05:25 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger716127
======================================================================

  Trigger: 00716127      Segment: 000

  BAT Trigger Time: 497568360   [s; MET]
      Trigger Stop: 497568424   [s; MET]
               UTC: 2016-10-07T21:25:43.026220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 103.390045627351   Dec: 23.2890509134283  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.47
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.47

  Analysis Position:   [ source = BAT ]
    RA: 103.390045627351   Dec: 23.2890509134283  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 103.405490725401   Dec: 23.2858228428065  [deg; J2000]  
        { 06h 53m 37.3s , +23d 17' 09.0" }
         +/- 1.57747175737236 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.806331413219356 [arcmin] (formal 1-sigma fit error)
    SNR: 15.860471905987
 
  Angular difference between the analysis and refined position is 0.872967 arcmin
 
  Partial Coding Fraction: 0.875    [ including projection effects ]

  Duration
     T90: 157.691999912262 +/- 40.5240279297954
        Measured from: 25.8600000143051
                   to: 183.551999926567     [s; relative to TRIGTIME]
     T50: 73.4839999675751 +/- 30.8610264970782
        Measured from: 34.4879999756813
                   to: 107.971999943256     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 33.8080000281334     
                   to: 34.8080000281334     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 18.2239999771118     
                   to: 261.184000015259     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.549604   0.884672   0.526414   0.218384
           0.078698   0.080732   0.068279   0.055694 [error]
 Peak      0.008039   0.017372   0.019871   0.010410
           0.005175   0.005490   0.004799   0.004000 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  242.960   18.224  261.184
T90   157.692   25.860  183.552
T50    73.484   34.488  107.972
Peak    1.000   33.808   34.808
 
 
====== 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      -1.455    -0.184      0.184       -           -               -         5.68e-04     -6.23e-05          6.20e-05      58.730   57
CPL     -1.130    -0.478      0.828      127.778     -62.569      -127.778      8.43e-04     -3.56e-04          1.44e-03      58.120   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      -0.865     -0.506     0.583       -           -               -         3.42e-03     -1.08e-03          1.03e-03      54.570   57
CPL     -0.412      0.412     2.992      212.229    -212.229      -212.229      5.28e-03     -2.82e-03          6.26e-02      54.410   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   1.69e-07  3.19e-07  4.65e-07  1.45e-06  1.32e-06  2.40e-06   erg/cm2
      90%_error_low -2.99e-08 -3.58e-08 -6.57e-08 -3.91e-07 -1.59e-07 -4.50e-07   erg/cm2
      90%_error_hi   3.11e-08  3.56e-08  6.54e-08  4.81e-07  1.61e-07  5.24e-07   erg/cm2
Peak flux       PL   7.68e-02  1.13e-01  1.24e-01  2.56e-01  3.92e-01  5.70e-01   ph/cm2/s
      90%_error_low -4.39e-02 -4.61e-02 -3.68e-02 -1.33e-01 -1.18e-01 -1.73e-01   ph/cm2/s
      90%_error_hi   5.67e-02  4.48e-02  3.64e-02  2.17e-01  1.20e-01  1.97e-01   ph/cm2/s
 
Fluence        CPL   1.62e-07  3.32e-07  4.72e-07  8.46e-07  1.28e-06  1.81e-06   erg/cm2
      90%_error_low -3.39e-08 -4.44e-08 -6.71e-08 -5.60e-07 -1.84e-07 -5.89e-07   erg/cm2
      90%_error_hi   3.45e-08  4.71e-08  7.04e-08  7.25e-07  1.82e-07  7.71e-07   erg/cm2
Peak flux      CPL   6.69e-02  1.14e-01  1.31e-01  1.70e-01  3.84e-01  4.82e-01   ph/cm2/s
      90%_error_low -5.35e-02 -5.10e-02 -4.25e-02 -1.70e-01 -1.23e-01 -2.01e-01   ph/cm2/s
      90%_error_hi   6.43e-02  4.95e-02  4.82e-02  1.32e-01  1.24e-01  2.61e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  103.4055    23.2858   0.0121    18.1943    47.1863         1.2365275     15.860 TRIG_00716127                 
 
Foreground time interval of the image:
 18.224  72.701 (delta_t =  54.477 [sec])
Background time interval of the image:
-239.000  18.224 (delta_t = 257.224 [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   18.224 sec. to  261.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45493     ( -0.18404   0.183889 )
Norm@50keV  : 5.67576E-04    ( -6.22797e-05   6.19563e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.73 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     57 degrees of freedom 
# Null hypothesis probability =   4.120149e-01
 
Photon flux (15-150 keV)    in 243 sec: 7.00334E-02 ( -0.0075941  0.0076029 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31876e-06 ( -1.59113e-07  1.60914e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   18.224 sec. to  261.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12975     ( -0.478398   0.82794 )
Epeak [keV] : 127.778      ( -62.5968 -127.806 )
Norm@50keV  : 8.43450E-04    ( -0.000355738   0.00144174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.12 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     56 degrees of freedom 
# Null hypothesis probability =   3.971623e-01
 
Photon flux (15-150 keV)    in 243 sec: 6.91640E-02 ( -0.0078485  0.0078314 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.27899e-06 ( -1.84158e-07  1.81697e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   33.808 sec. to   34.808 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.86525     ( -0.505675   0.583367 )
Norm@50keV  : 3.41542E-03    ( -0.00107558   0.00102948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.57 using 59 PHA bins.
# Reduced chi-squared =         0.9574 for     57 degrees of freedom 
# Null hypothesis probability =   5.667824e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.391998 ( -0.118036  0.119756 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.88624e-08 ( -1.16379e-08  1.17667e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   33.808 sec. to   34.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.411647     ( 0.41165   2.99235 )
Epeak [keV] : 212.229      ( -212.23 -212.23 )
Norm@50keV  : 5.28378E-03    ( -0.00282161   0.0626285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.41 using 59 PHA bins.
# Reduced chi-squared =         0.9716 for     56 degrees of freedom 
# Null hypothesis probability =   5.352159e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.384124 ( -0.122694  0.123749 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.8147e-08 ( -1.24099e-08  1.21405e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 157.692 sec.
Hardness ratio (energy fluence ratio) = 1.45911619535

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

S(15-50 keV)  = 4.877227e-07
S(50-150 keV) = 8.310551e-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 = 2.233720345562097E-01, IMY = -2.411041783122516E-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:
-239.000000 18.224000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6276  22.0153    0.4  33.6   71.1  10.8997  27.1    0.3	Crab                          
 65.1426  60.3340    2.5  42.1  138.4   2.3860   4.7 ------	UNKNOWN                       
142.3073 -14.2501    3.9  54.4  -33.1   3.3618   3.0 ------	UNKNOWN                       
167.5538  29.0249    2.8  41.2 -100.1   3.8489   4.1 ------	UNKNOWN                       

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

Time interval of the image:
18.224000 72.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6270  22.0126   20.2  33.6   71.0   0.0833   0.6    0.4	Crab                          
 95.1369   1.9423    2.0  40.2   33.8   0.8280   5.7 ------	UNKNOWN                       
103.4055  23.2859    0.7  18.2   47.2   1.2358  15.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
113.500590 963.039000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6251  22.0209    0.2  18.3   84.9  35.0236  59.0    0.6	Crab                          
 75.5557   0.6974    2.0  35.2   49.0   5.0594   5.6 ------	UNKNOWN                       
 83.4693 -27.8031    2.5  54.6   16.6  11.6555   4.7 ------	UNKNOWN                       
 83.6566  13.5443    3.6  21.1   60.9   1.7638   3.2 ------	UNKNOWN                       
 93.5572  13.0097    3.7  13.9   38.9   1.6796   3.1 ------	UNKNOWN                       
148.6236  49.2389    4.2  43.8 -143.0   3.5261   2.7 ------	UNKNOWN                       
157.2602  40.2884    3.6  48.0 -129.1  12.0254   3.3 ------	UNKNOWN