batgrbproduct analysis for trigger=646786

batgrbproduct Analysis for Trigger=646786

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 (local time): Sat Jul 11 00:06:23 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger646786
======================================================================

  Trigger: 00646786      Segment: 000

  BAT Trigger Time: 457042986.56   [s; MET]
      Trigger Stop: 457042990.656   [s; MET]
               UTC: 2015-06-26T20:22:52.787720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 187.672182135   Dec: 66.7793620338311  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.54
     Image Trigger?:     NO
     Rate S/N Ratio:     12.1243556529821  [ if not an image trigger ]
     Image S/N Ratio:    7.54

  Flight Position:   [ source = BAT ]
    RA: 187.672182135   Dec: 66.7793620338311  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 187.623026706687   Dec: 66.7960499586806  [deg; J2000]  
        { 12h 30m 29.5s , +66d 47' 45.8" }
         +/- 1.92762806675177 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.18681440926208 [arcmin] (formal 1-sigma fit error)
    SNR: 11.9108380941976
 
  Angular difference between Flight and Ground position is 1.534220 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 48 +/- 22.6274169979695
        Measured from: -15.5600000023842
                   to: 32.4399999976158     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 0.439999997615814
                   to: 16.4399999976158     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.93999999761581     
                   to: 8.93999999761581     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.5600000023842     
                   to: 32.4399999976158     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.310989   0.525082   0.500034   0.093473
           0.061842   0.064320   0.056167   0.047193 [error]
 Peak      0.011171   0.034548   0.009913  -0.006026
           0.009234   0.009503   0.008297   0.006739 [error]

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

======================================================================
 
=== 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   Power-law 1.06e-07 2.26e-07 3.76e-07 1.42e-06 1.04e-06 2.13e-06   erg/cm2
              Error 2.64e-08 3.37e-08 5.23e-08 4.48e-07 1.34e-07 4.74e-07   erg/cm2
Peak flux Power-law 1.86e-01 1.69e-01 1.06e-01 1.02e-01 5.04e-01 5.63e-01   ph/cm2/s
              Error 1.32e-01 8.32e-02 6.22e-02 1.33e-01 2.43e-01 2.67e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.00e-07 2.30e-07 3.87e-07 1.05e-06 1.03e-06 1.77e-06   erg/cm2
              Error 3.16e-08 3.66e-08 6.19e-08 6.48e-07 1.37e-07 5.88e-07   erg/cm2
Peak flux Cutoff-PL 1.20e-01 3.20e-01 1.91e-02 5.09e-07 4.58e-01 4.58e-01   ph/cm2/s
              Error 1.03e-01 1.27e-01 4.91e-02 1.82e-03 1.92e-01 1.93e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.265    0.216    -      -           2.16e-03 2.69e-04   60.270 57
CPL   1.023    0.657     231.9    0.0      2.78e-03 3.28e-03   59.980 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.673    0.789    -      -           3.83e-03 1.89e-03   59.960 57
CPL  -9.913    0.000      34.3    6.6      1.05e+05 0.00e+00   54.650 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 31.680000 sec.
T50 in the 50-300 keV band: 15.360000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.000  -15.560   32.440
T90    48.000  -15.560   32.440
T50    16.000    0.440   16.440
Peak    1.000    7.940    8.940

Click here for the BAT GCN circular template

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  187.6230    66.7960   0.0161    44.4767     8.5100         1.6144993     11.911 TRIG_00646786                 
 
Foreground time interval of the image:
-15.560  32.440 (delta_t =  48.000 [sec])
Background time interval of the image:
-239.560 -15.560 (delta_t = 224.000 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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  -15.560 sec. to   32.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26518     ( -0.21845   0.212758 )
Norm@50keV  : 2.16446E-03    ( -0.000269055   0.000268435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.27 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     57 degrees of freedom 
# Null hypothesis probability =   3.585407e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.256644 ( -0.0342053  0.0344139 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03567e-06 ( -1.33496e-07  1.33905e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -15.560 sec. to   32.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02327     ( -0.882055   0.431369 )
Epeak [keV] : 231.900      ( -231.713 -231.713 )
Norm@50keV  : 2.77889E-03    ( -0.00277964   0.00378573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.98 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.336318e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.253788 ( -0.035385  0.034554 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02713e-06 ( -1.37832e-07  1.3715e-07 ) ergs/cm2

Band function

Time interval is from  -15.560 sec. to   32.440 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.56659   ( -4.56659   -4.56659 )
beta        : -1.33542    ( -0.25082   0.242622 )
Epeak [keV] : 27.4881      ( -27.4881 162.802 )
Norm@50keV   : 52.1241    ( -6.40324   755031 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.58 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     55 degrees of freedom 
# Null hypothesis probability =   3.125248e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.253383 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 20.7655  (-3.1908  3.95106)
R^2/D10^2   : 1.01751E-02  (-0.00449369   0.00773124)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.25 using 59 PHA bins.
# Reduced chi-squared =          1.303 for     57 degrees of freedom 
# Null hypothesis probability =   6.204651e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.998e-08   1.089e-08
25- 50  2.041e-07   4.370e-08
50-150  6.552e-07   1.396e-07
15-150  8.992e-07   1.474e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.09380       (-0.136806     0.136785)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.78 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     57 degrees of freedom 
# Null hypothesis probability =   1.990815e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.308e-07   7.373e-08
25- 50  2.516e-07   1.391e-07
50-150  5.518e-07   3.036e-07
15-150  9.341e-07   5.160e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.99108        (-2.12172      2.86561)
R1^2/D10^2  : 0.235880        (-0.164082      0.355094)
kT2 [keV]   : 30.3329        (-6.95025      14.4819)
R2^2/D10^2  : 2.50946E-03    (-0.00175798   0.00357206)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     55 degrees of freedom 
# Null hypothesis probability =   3.805950e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.060e-07   5.701e-08
25- 50  2.280e-07   1.212e-07
50-150  7.105e-07   3.838e-07
15-150  1.044e-06   4.852e-07

Peak spectrum fit

Power-law model

Time interval is from    7.940 sec. to    8.940 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67266     ( -0.793898   0.783923 )
Norm@50keV  : 3.83039E-03    ( -0.00190678   0.00187069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.96 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.687939e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.503868 ( -0.241911  0.244619 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55587e-08 ( -1.72963e-08  1.85102e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    7.940 sec. to    8.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -9.91267     (     )
Epeak [keV] : 34.2940      ( -5.75786 7.51429 )
Norm@50keV  : 1.05360E+05    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.65 using 59 PHA bins.
# Reduced chi-squared =         0.9758 for     56 degrees of freedom 
# Null hypothesis probability =   5.262578e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.457649 ( -0.183804  0.200863 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32304e-08 ( -9.1898e-09  1.06306e-08 ) ergs/cm2

Band function

Time interval is from    7.940 sec. to    8.940 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -14.2966   -5 )
beta        : -3.79635    ( 3.79386   2.04078 )
Epeak [keV] : 35.2352      ( -9.45787 10.1775 )
Norm@50keV   : 84.0933    ( -33.3268   442.922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.28 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     55 degrees of freedom 
# Null hypothesis probability =   4.640794e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 9.77770  (-2.82795  4.9173)
R^2/D10^2   : 0.304447  (-0.304298   0.824257)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.20 using 59 PHA bins.
# Reduced chi-squared =          1.003 for     57 degrees of freedom 
# Null hypothesis probability =   4.678071e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.880e-09   3.816e-09
25- 50  1.416e-08   9.265e-09
50-150  6.921e-09   5.725e-09
15-150  2.696e-08   1.787e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 97.2884       (-97.2884      -97.2884)
Norm        : 2.32866       (-1.19781     2.36272)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.52 using 59 PHA bins.
# Reduced chi-squared =          1.044 for     57 degrees of freedom 
# Null hypothesis probability =   3.840268e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.086e-09   3.946e-09
25- 50  1.046e-08   7.015e-09
50-150  1.669e-08   1.486e-08
15-150  3.324e-08   2.436e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 200.000        (      )
R1^2/D10^2  : 4.51910E-05        (-4.5194e-05      -4.5194e-05)
kT2 [keV]   : 9.09914        (-2.60103      4.31171)
R2^2/D10^2  : 0.373989    (-0.276747   1.03231)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.97 using 59 PHA bins.
#Fit statistic : Chi-Squared =          55.96 using 59 PHA bins.
# Reduced chi-squared =          1.018 for     55 degrees of freedom 
# Reduced chi-squared =          1.017 for     55 degrees of freedom 
# Null hypothesis probability =   4.382705e-01
# Null hypothesis probability =   4.387440e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.132e-09   4.161e-09
25- 50  1.360e-08   8.785e-09
50-150  1.607e-08   5.515e-09
15-150  3.581e-08   1.803e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26518     ( -0.21845   0.212758 )
Norm@50keV  : 2.16446E-03    ( -0.000269055   0.000268435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.27 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     57 degrees of freedom 
# Null hypothesis probability =   3.585407e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.256644 ( -0.0342053  0.0344139 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03567e-06 ( -1.33496e-07  1.33905e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02327     ( -0.882055   0.431369 )
Epeak [keV] : 231.900      ( -231.713 -231.713 )
Norm@50keV  : 2.77889E-03    ( -0.00277964   0.00378573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.98 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.336318e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.253788 ( -0.035385  0.034554 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02713e-06 ( -1.37832e-07  1.3715e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.56659   ( -4.56659   -4.56659 )
beta        : -1.33542    ( -0.25082   0.242622 )
Epeak [keV] : 27.4881      ( -27.4881 162.802 )
Norm@50keV   : 52.1241    ( -6.40324   755031 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.58 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     55 degrees of freedom 
# Null hypothesis probability =   3.125248e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.253383 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 2.26e-07
S(50-100 keV) = 3.76e-07

T90 vs. Hardness ratio plot

T90                                   = 48 sec.
Hardness ratio (energy fluence ratio) = 1.66372

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.68843
Count Ratio (50-100 keV) / (15-25 keV) = 1.60788

Mask shadow pattern

IMX = 9.710885768240416E-01, IMY = -1.453035710561384E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-239.560000 -15.560000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
163.2774  49.3225    2.1  23.1   11.9   0.8563   5.6 ------	UNKNOWN                       
105.6827  12.5606    2.5  43.5 -114.7   3.2736   4.7 ------	UNKNOWN

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

Time interval of the image:
-15.560000 32.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
191.8663  20.2605    2.1  39.6   80.6   1.6360   5.4 ------	UNKNOWN                       
159.8740 -22.0795    2.1  52.0  155.4   1.9292   5.5 ------	UNKNOWN                       
187.6233  66.7959    1.0  44.5    8.5   1.6149  11.9 ------	UNKNOWN                       
141.4585 -10.9481    2.5  40.5  179.7   0.5199   4.6 ------	UNKNOWN                       
 85.8429  78.0839    2.7  56.4  -24.8   1.2742   4.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
110.340600 962.554200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
223.6218  72.5701    4.0  13.5   37.4   1.1711   2.9 ------	UNKNOWN                       
 13.6910  58.7334    3.3  54.4  -15.3   4.6904   3.6 ------	UNKNOWN                       
 71.9404  57.3859    3.2  47.0  -53.0   8.7744   3.6 ------	UNKNOWN                       
139.0405  28.5640    3.9  48.0 -129.1   5.8946   3.0 ------	UNKNOWN

Plot creation:
Sat Jul 11 00:47:16 EDT 2015