GRB160417A: 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 Jun  1 15:50:21 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger683076
======================================================================

  Trigger: 00683076      Segment: 000

  BAT Trigger Time: 482559837.184   [s; MET]
      Trigger Stop: 482559841.28   [s; MET]
               UTC: 2016-04-17T04:23:41.047080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 120.239601231894   Dec: 7.67083182618275  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2065556157337  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 120.239601231894   Dec: 7.67083182618275  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 120.26119485532   Dec: 7.64577746435861  [deg; J2000]  
        { 08h 01m 02.7s , +07d 38' 44.8" }
         +/- 1.88489570359867 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.911537030679353 [arcmin] (formal 1-sigma fit error)
    SNR: 12.2984611493289
 
  Angular difference between the analysis and refined position is 1.977020 arcmin
 
  Partial Coding Fraction: 0.4140625    [ including projection effects ]

  Duration
     T90: 14.5519999265671 +/- 2.31705759617694
        Measured from: -1.18400001525879
                   to: 13.3679999113083     [s; relative to TRIGTIME]
     T50: 7.79599994421005 +/- 1.62308347734845
        Measured from: 1.87999999523163
                   to: 9.67599993944168     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.50799995660782     
                   to: 2.50799995660782     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.1360000371933     
                   to: 13.8880000114441     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.368036   0.357334   0.233119   0.082620
           0.039524   0.040964   0.035684   0.031376 [error]
 Peak      0.017645   0.051370   0.023814   0.016950
           0.010334   0.010756   0.009481   0.008364 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   16.024   -2.136   13.888
T90    14.552   -1.184   13.368
T50     7.796    1.880    9.676
Peak    1.000    1.508    2.508
 
 
====== 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      -1.926    -0.245      0.230       -           -               -         4.05e-03     -5.82e-04          5.61e-04      66.510   57
CPL     -1.929    -0.818      0.286     9999.360      N/A           N/A         4.04e-03        N/A               N/A         66.510   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      -1.499     -0.506     0.495       -           -               -         7.72e-03     -2.18e-03          2.16e-03      54.010   57
CPL     -0.595     -5.556     0.595       77.389      N/A           N/A         2.20e-02        N/A               N/A         53.800   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   1.24e-07  1.75e-07  1.85e-07  3.59e-07  5.96e-07  8.42e-07   erg/cm2
      90%_error_low -2.27e-08 -2.07e-08 -3.65e-08 -1.28e-07 -8.19e-08 -1.67e-07   erg/cm2
      90%_error_hi   2.37e-08  2.07e-08  3.64e-08  1.66e-07  8.29e-08  1.95e-07   erg/cm2
Peak flux       PL   3.18e-01  3.20e-01  2.26e-01  2.54e-01  9.64e-01  1.12e+00   ph/cm2/s
      90%_error_low -1.45e-01 -9.98e-02 -7.86e-02 -1.44e-01 -2.77e-01 -3.11e-01   ph/cm2/s
      90%_error_hi   1.69e-01  9.68e-02  7.62e-02  2.22e-01  2.80e-01  3.12e-01   ph/cm2/s
 
Fluence        CPL   1.22e-07  1.67e-07  1.75e-07  3.98e-07  5.75e-07  8.59e-07   erg/cm2
      90%_error_low    N/A    -3.91e-08 -3.95e-08 -1.72e-07 -1.32e-07 -2.08e-07   erg/cm2
      90%_error_hi     N/A     2.49e-08  2.52e-08  4.73e-08  8.59e-08  1.14e-07   erg/cm2
Peak flux      CPL   2.62e-01  3.48e-01  2.42e-01  9.56e-02  9.17e-01  9.57e-01   ph/cm2/s
      90%_error_low -2.62e-01 -1.17e-01 -9.03e-02 -9.56e-02 -4.37e-01 -4.78e-01   ph/cm2/s
      90%_error_hi   2.16e-01  1.85e-01  9.72e-02  1.74e-01  3.07e-01  3.62e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  120.2612     7.6458   0.0156    45.2450  -170.0471         1.0278794     12.298 TRIG_00683076                 
 
Foreground time interval of the image:
 -2.136  13.888 (delta_t =  16.024 [sec])
Background time interval of the image:
-71.683  -2.136 (delta_t =  69.547 [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   -2.136 sec. to   13.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92594     ( -0.244537   0.230157 )
Norm@50keV  : 4.04506E-03    ( -0.000581736   0.000560972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.51 using 59 PHA bins.
# Reduced chi-squared =          1.167 for     57 degrees of freedom 
# Null hypothesis probability =   1.821165e-01
 
Photon flux (15-150 keV)    in 16.02 sec: 0.587045 ( -0.070793  0.07097 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.96091e-07 ( -8.1879e-08  8.29442e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -2.136 sec. to   13.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.52399     ( -0.22335   0.880404 )
Epeak [keV] : 187.437      (   )
Norm@50keV  : 2.04749E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.32 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     56 degrees of freedom 
# Null hypothesis probability =   1.845287e-01
 
Photon flux (15-150 keV)    in 16.02 sec: 0.588747 ( -0.109808  0.07068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.74887e-07 ( -1.31644e-07  8.58557e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.508 sec. to    2.508 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49949     ( -0.505545   0.494606 )
Norm@50keV  : 7.72026E-03    ( -0.00217869   0.00215863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.01 using 59 PHA bins.
# Reduced chi-squared =         0.9476 for     57 degrees of freedom 
# Null hypothesis probability =   5.878833e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.963683 ( -0.277415  0.279677 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.32538e-08 ( -2.19547e-08  2.23247e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.508 sec. to    2.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.595282     ( -5.59504   0.556714 )
Epeak [keV] : 77.3895      (   )
Norm@50keV  : 2.19550E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.80 using 59 PHA bins.
# Reduced chi-squared =         0.9607 for     56 degrees of freedom 
# Null hypothesis probability =   5.587196e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.916924 ( -0.437457  0.307486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.74109e-08 ( -3.34609e-08  2.552e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 14.552 sec.
Hardness ratio (energy fluence ratio) = 1.05271215724

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

S(15-50 keV)  = 2.989924e-07
S(50-150 keV) = 2.970878e-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 = -9.934089672929708E-01, IMY = 1.743224831969709E-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:
-71.683400 -2.136000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
223.4573  76.7427    2.7  46.3  -27.3   0.7530   4.3 ------	UNKNOWN                       

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

Time interval of the image:
-2.136000 13.888000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
120.7385  -5.1950    2.2  55.4  179.7   1.1516   5.2 ------	UNKNOWN                       
234.1738  60.3469    2.6  50.7   -5.5   0.4562   4.4 ------	UNKNOWN                       
120.2612   7.6458    0.9  45.2 -170.0   1.0282  12.3 ------	UNKNOWN                       
123.6029  26.6266    2.5  29.8 -150.8   0.2615   4.6 ------	UNKNOWN                       
271.9332  84.3628    2.3  52.8  -38.0   1.0934   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
116.116590 962.949100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6261  22.0069    0.5  38.0  -74.8  35.6558  22.3    0.6	Crab                          
135.4370 -40.5507    4.9  50.2  154.0   5.5388   2.4    4.2	Vela X-1                      
158.7697  43.3260    2.9  49.0   25.9   6.3620   4.1 ------	UNKNOWN                       
153.1254  28.6283    3.7  37.4   40.8   2.9240   3.2 ------	UNKNOWN                       
127.6787 -31.2411    3.1  39.6  159.0   3.3544   3.8 ------	UNKNOWN