GRB140709B: 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: Sat Oct  4 21:35:12 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger603866
======================================================================

  Trigger: 00603866      Segment: 000

  BAT Trigger Time: 426611757.248   [s; MET]
      Trigger Stop: 426611761.344   [s; MET]
               UTC: 2014-07-09T15:15:45.004740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 146.070957947034   Dec: 63.5055176990785  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.65
     Image Trigger?:     NO
     Rate S/N Ratio:     8.54400374531753  [ if not an image trigger ]
     Image S/N Ratio:    9.65

  Analysis Position:   [ source = BAT ]
    RA: 146.070957947034   Dec: 63.5055176990785  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 146.049010669029   Dec: 63.5356137600143  [deg; J2000]  
        { 09h 44m 11.8s , +63d 32' 08.2" }
         +/- 0.879902176116548 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.311853828602275 [arcmin] (formal 1-sigma fit error)
    SNR: 36.5172294483159
 
  Angular difference between the analysis and refined position is 1.898822 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 156.731999993324 +/- 26.229642415299
        Measured from: -6.23200005292892
                   to: 150.499999940395     [s; relative to TRIGTIME]
     T50: 93.0439999103546 +/- 4.50269967604861
        Measured from: 17.055999994278
                   to: 110.099999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 123.631999969482     
                   to: 124.631999969482     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -18.4960000514984     
                   to: 200.719999969006     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.461526   2.452086   2.131347   0.568805
           0.083282   0.086594   0.076758   0.065697 [error]
 Peak      0.030901   0.054121   0.023616   0.009754
           0.006023   0.006416   0.005809   0.004329 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  219.216  -18.496  200.720
T90   156.732   -6.232  150.500
T50    93.044   17.056  110.100
Peak    1.000  123.632  124.632
 
 
====== 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      -1.234    -0.072      0.073       -           -               -         1.97e-03     -7.75e-05          7.75e-05      56.420   57
CPL     -0.839    -0.291      0.312      162.081     -48.014       267.650      2.98e-03     -7.69e-04          1.12e-03      50.900   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      -1.640     -0.263     0.251       -           -               -         7.02e-03     -1.24e-03          1.21e-03      55.120   57
CPL     -0.245     -1.351     2.426       52.333     -13.062       214.241      4.53e-02     -4.53e-02          1.29e+00      52.020   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   4.29e-07  9.29e-07  1.58e-06  6.17e-06  4.33e-06  9.11e-06   erg/cm2
      90%_error_low -3.36e-08 -4.31e-08 -7.44e-08 -6.45e-07 -1.87e-07 -6.89e-07   erg/cm2
      90%_error_hi   3.46e-08  4.29e-08  7.42e-08  6.97e-07  1.88e-07  7.33e-07   erg/cm2
Peak flux       PL   3.31e-01  3.06e-01  1.97e-01  1.94e-01  9.14e-01  1.03e+00   ph/cm2/s
      90%_error_low -7.34e-02 -4.79e-02 -4.36e-02 -7.18e-02 -1.42e-01 -1.66e-01   ph/cm2/s
      90%_error_hi   7.66e-02  4.79e-02  4.39e-02  9.31e-02  1.42e-01  1.68e-01   ph/cm2/s
 
Fluence        CPL   3.91e-07  9.53e-07  1.63e-06  3.66e-06  4.22e-06  6.63e-06   erg/cm2
      90%_error_low -4.25e-08 -4.75e-08 -8.47e-08 -1.09e-06 -2.07e-07 -1.10e-06   erg/cm2
      90%_error_hi   4.36e-08  4.79e-08  8.57e-08  1.67e-06  2.06e-07  1.66e-06   erg/cm2
Peak flux      CPL   2.93e-01  3.62e-01  1.91e-01  3.76e-02  8.77e-01  8.84e-01   ph/cm2/s
      90%_error_low -8.72e-02 -7.27e-02 -7.33e-02 -3.76e-02 -1.50e-01 -1.56e-01   ph/cm2/s
      90%_error_hi   8.64e-02  8.23e-02  5.52e-02  1.46e-01  1.48e-01  1.79e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  146.0490    63.5356   0.0052    10.3626  -125.1465         3.8749109     36.517 TRIG_00603866                 
 
Foreground time interval of the image:
-18.496  50.053 (delta_t =  68.549 [sec])
Background time interval of the image:
-608.047 -590.677 (delta_t =  17.371 [sec])
-239.248 -18.496 (delta_t = 220.752 [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  -18.496 sec. to  200.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23408     ( -0.0723124   0.0726564 )
Norm@50keV  : 1.96688E-03    ( -7.746e-05   7.74547e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.42 using 59 PHA bins.
# Reduced chi-squared =         0.9898 for     57 degrees of freedom 
# Null hypothesis probability =   4.967663e-01
 
Photon flux (15-150 keV)    in 219.2 sec: 0.232042 ( -0.009594  0.009611 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.33363e-06 ( -1.87043e-07  1.87747e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -18.496 sec. to  200.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.838804     ( -0.290594   0.311595 )
Epeak [keV] : 162.081      ( -48.0137 267.65 )
Norm@50keV  : 2.98271E-03    ( -0.000768864   0.0011179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.90 using 59 PHA bins.
# Reduced chi-squared =         0.9090 for     56 degrees of freedom 
# Null hypothesis probability =   6.676338e-01
 
Photon flux (15-150 keV)    in 219.2 sec: 0.226666 ( -0.010324  0.010334 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.21892e-06 ( -2.07109e-07  2.06256e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  123.632 sec. to  124.632 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64014     ( -0.262587   0.251072 )
Norm@50keV  : 7.02225E-03    ( -0.00123796   0.00121348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.12 using 59 PHA bins.
# Reduced chi-squared =         0.9669 for     57 degrees of freedom 
# Null hypothesis probability =   5.460780e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.914007 ( -0.142269  0.142273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.53853e-08 ( -1.2107e-08  1.23987e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  123.632 sec. to  124.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.244553     ( -1.35247   2.42407 )
Epeak [keV] : 52.3329      ( -13.0308 214.273 )
Norm@50keV  : 4.53022E-02    ( -0.0454989   1.29303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.02 using 59 PHA bins.
# Reduced chi-squared =         0.9289 for     56 degrees of freedom 
# Null hypothesis probability =   6.263991e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.877201 ( -0.150425  0.148479 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.63547e-08 ( -1.39982e-08  1.53141e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 156.732 sec.
Hardness ratio (energy fluence ratio) = 1.70047451763

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

S(15-50 keV)  = 1.3581027e-06
S(50-150 keV) = 2.975564e-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 = -1.052671011381097E-01, IMY = 1.495215824736000E-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:
-608.047400 -590.676500
-239.248000 -18.496000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 28.1447  49.6000    2.7  51.5   -7.5   1.8589   4.3 ------	UNKNOWN                       
171.5777  16.7686    2.7  57.6 -165.4   3.9147   4.3 ------	UNKNOWN                       
166.2272  15.2050    6.0  58.7 -159.2   2.7033   1.9 ------	UNKNOWN                       

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

Time interval of the image:
-18.496000 50.052600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
146.0497  63.5348    0.3  10.4 -125.1   3.9183  36.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
80.052600 962.908800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
359.9812  59.5313    3.2  54.3   21.0  11.6961   3.6 ------	UNKNOWN                       
210.0336  84.3587    1.9  24.5   53.7   3.7402   5.9 ------	UNKNOWN                       
145.9665  63.4294    2.2   0.1 -109.8   2.5765   5.1 ------	UNKNOWN                       
 92.0341  70.6823    2.7  21.4   -6.0   2.0160   4.2 ------	UNKNOWN                       
 63.0314  56.4103    2.6  39.2  -19.1   2.9178   4.5 ------	UNKNOWN                       
163.6630   6.1962    4.2  58.7 -159.2  12.2227   2.8 ------	UNKNOWN                       
 88.5822  34.9279    2.7  44.9  -60.0   9.5818   4.2 ------	UNKNOWN