batgrbproduct analysis for trigger=627170

batgrbproduct Analysis for Trigger=627170

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): Wed Feb 11 07:45:39 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger627170
======================================================================

  Trigger: 00627170      Segment: 000

  BAT Trigger Time: 443431328.704   [s; MET]
      Trigger Stop: 443431330.752   [s; MET]
               UTC: 2015-01-20T07:21:55.628600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 39.2941689420528   Dec: 8.07853027689263  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.1
     Image Trigger?:     NO
     Rate S/N Ratio:     7.74596669241483  [ if not an image trigger ]
     Image S/N Ratio:    7.1

  Flight Position:   [ source = BAT ]
    RA: 39.2941689420528   Dec: 8.07853027689263  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 39.307209627024   Dec: 8.06433552121301  [deg; J2000]  
        { 02h 37m 13.7s , +08d 03' 51.6" }
         +/- 2.29447489656789 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.15458113426643 [arcmin] (formal 1-sigma fit error)
    SNR: 9.28659504231606
 
  Angular difference between Flight and Ground position is 1.151309 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 24.3359999656677 +/- 3.27792376660314
        Measured from: -15.7319999933243
                   to: 8.60399997234344     [s; relative to TRIGTIME]
     T50: 14.0119999647141 +/- 6.95071221860736
        Measured from: -10.9480000138283
                   to: 3.06399995088577     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.583999991416931     
                   to: 1.58399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -17.6359999775887     
                   to: 10.5440000295639     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.396165   0.392244   0.190429   0.022831
           0.045335   0.046000   0.039353   0.033665 [error]
 Peak      0.048064   0.044288   0.034724   0.009731
           0.009213   0.009460   0.007741   0.006082 [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 1.45e-07 1.70e-07 1.45e-07 2.08e-07 5.34e-07 6.68e-07   erg/cm2
              Error 2.46e-08 2.31e-08 3.67e-08 1.01e-07 8.47e-08 1.48e-07   erg/cm2
Peak flux Power-law 5.25e-01 4.08e-01 2.13e-01 1.61e-01 1.22e+00 1.31e+00   ph/cm2/s
              Error 1.52e-01 7.99e-02 6.51e-02 9.47e-02 2.41e-01 2.56e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.39e-07 1.85e-07 1.36e-07 6.29e-08 5.01e-07 5.22e-07   erg/cm2
              Error 2.69e-08 3.19e-08 4.47e-08 1.38e-07 9.39e-08 1.82e-07   erg/cm2
Peak flux Cutoff-PL 5.09e-01 4.21e-01 2.16e-01 1.17e-01 1.21e+00 1.26e+00   ph/cm2/s
              Error 1.77e-01 1.04e-01 7.01e-02 1.36e-01 2.46e-01 2.56e-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    2.236    0.259    -      -           2.00e-03 3.71e-04   46.930 57
CPL   1.541    0.889      25.8    0.0      5.27e-03 0.00e+00   45.630 56
 
The chi2 of BB fit is -------- which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.938    0.361    -      -           8.37e-03 1.96e-03   60.280 57
CPL   1.682    1.249      57.1    0.0      1.16e-02 0.00e+00   60.210 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   28.180  -17.636   10.544
T90    24.336  -15.732    8.604
T50    14.012  -10.948    3.064
Peak    1.000    0.584    1.584

Click here for the BAT GCN circular template

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   39.3072     8.0643   0.0208    37.2135   146.5094         0.9767557      9.287 TRIG_00627170                 
 
Foreground time interval of the image:
-17.636  10.544 (delta_t =  28.180 [sec])
Background time interval of the image:
-63.603 -17.636 (delta_t =  45.967 [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  -17.636 sec. to   10.544 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.23627     ( -0.24687   0.270794 )
Norm@50keV  : 2.00490E-03    ( -0.000376279   0.000366019 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.93 using 59 PHA bins.
# Reduced chi-squared =         0.8232 for     57 degrees of freedom 
# Null hypothesis probability =   8.269769e-01
 
Photon flux (15-150 keV)    in 28.18 sec: 0.338378 ( -0.0436548  0.0436584 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.34073e-07 ( -8.34875e-08  8.59651e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -17.636 sec. to   10.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.54098     ( -1.33028   0.44862 )
Epeak [keV] : 25.7908      (   )
Norm@50keV  : 5.26667E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8148 for     56 degrees of freedom 
# Null hypothesis probability =   8.374539e-01
 
Photon flux (15-150 keV)    in 28.18 sec: 0.331343 ( -0.044697  0.044795 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00781e-07 ( -8.94969e-08  9.82806e-08 ) ergs/cm2

Band function

Time interval is from  -17.636 sec. to   10.544 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.51849   ( 1.51851   1.51851 )
beta        : -3.28384    ( 3.35556   10.7045 )
Epeak [keV] : 26.0878      ( -26.0904 16.554 )
Norm@50keV   : 5.44304E-03    ( -0.00314694   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.62 using 59 PHA bins.
# Reduced chi-squared =         0.8295 for     55 degrees of freedom 
# Null hypothesis probability =   8.122778e-01
 
Photon flux (15-150 keV)    in 28.18 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]    : 8.50107  (-1.2491  1.45457)
R^2/D10^2   : 0.290719  (-0.135263   0.25781)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.03 using 59 PHA bins.
# Reduced chi-squared =         0.9830 for     57 degrees of freedom 
# Null hypothesis probability =   5.114797e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.116e-07   2.841e-08
25- 50  2.164e-07   3.725e-08
50-150  6.914e-08   2.743e-08
15-150  3.972e-07   7.059e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 45.5334       (-13.2072      21.8135)
Norm        : 2.02399       (-0.430347     0.595225)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.72 using 59 PHA bins.
# Reduced chi-squared =         0.8022 for     57 degrees of freedom 
# Null hypothesis probability =   8.580298e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.362e-07   2.347e-08
25- 50  1.890e-07   3.404e-08
50-150  1.675e-07   6.221e-08
15-150  4.927e-07   9.412e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.98842        (-2.38729      2.18002)
R1^2/D10^2  : 1.65391        (-1.18674      28.987)
kT2 [keV]   : 15.0035        (-5.00251      13.8255)
R2^2/D10^2  : 2.05005E-02    (-0.0192134   0.111623)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.91 using 59 PHA bins.
# Reduced chi-squared =         0.8347 for     55 degrees of freedom 
# Null hypothesis probability =   8.037887e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.395e-07   7.585e-08
25- 50  1.811e-07   9.653e-08
50-150  1.687e-07   9.547e-08
15-150  4.893e-07   2.570e-07

Peak spectrum fit

Power-law model

Time interval is from    0.584 sec. to    1.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.93752     ( -0.341447   0.381415 )
Norm@50keV  : 8.36696E-03    ( -0.00200835   0.00191167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.28 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.580096e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.22033 ( -0.240574  0.240791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.69717e-08 ( -1.73864e-08  1.77062e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.584 sec. to    1.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.68241     ( -1.98152   0.517149 )
Epeak [keV] : 57.0932      (   )
Norm@50keV  : 1.15544E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.21 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     56 degrees of freedom 
# Null hypothesis probability =   3.260391e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.21176 ( -0.247394  0.2448 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.5786e-08 ( -1.86027e-08  1.86666e-08 ) ergs/cm2

Band function

Time interval is from    0.584 sec. to    1.584 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.55334   ( 1.2786   1.2786 )
beta        : -2.25525    ( 2.25345   2.57112 )
Epeak [keV] : 52.8474      ( -52.673 -52.673 )
Norm@50keV   : 1.35946E-02    ( -0.00679973   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.14 using 59 PHA bins.
# Reduced chi-squared =          1.093 for     55 degrees of freedom 
# Null hypothesis probability =   2.951763e-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]    : 11.8878  (-2.39884  2.80536)
R^2/D10^2   : 0.307031  (-0.170454   0.398831)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.85 using 59 PHA bins.
# Reduced chi-squared =          1.155 for     57 degrees of freedom 
# Null hypothesis probability =   1.972637e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.169e-09   3.092e-09
25- 50  2.854e-08   9.510e-09
50-150  2.410e-08   1.156e-08
15-150  6.181e-08   1.992e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 80.5607       (-35.7369      103.96)
Norm        : 5.73171       (-1.50102     2.04755)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.36 using 59 PHA bins.
# Reduced chi-squared =          1.059 for     57 degrees of freedom 
# Null hypothesis probability =   3.552472e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.488e-08   4.058e-09
25- 50  2.454e-08   7.240e-09
50-150  3.480e-08   2.371e-08
15-150  7.421e-08   2.987e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.44608        (-2.10413      3.01323)
R1^2/D10^2  : 193.301        (-190.462      -193.336)
kT2 [keV]   : 13.9998        (-3.12806      5.1875)
R2^2/D10^2  : 0.150063    (-0.110007   0.138608)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.54 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     55 degrees of freedom 
# Null hypothesis probability =   3.467274e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.525e-08   7.532e-09
25- 50  2.371e-08   1.221e-08
50-150  2.982e-08   1.904e-08
15-150  6.878e-08   3.104e-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: 2.23627     ( -0.24687   0.270794 )
Norm@50keV  : 2.00490E-03    ( -0.000376279   0.000366019 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.93 using 59 PHA bins.
# Reduced chi-squared =         0.8232 for     57 degrees of freedom 
# Null hypothesis probability =   8.269769e-01
 
Photon flux (15-150 keV)    in 28.18 sec: 0.338378 ( -0.0436548  0.0436584 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.34073e-07 ( -8.34875e-08  8.59651e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.54098     ( -1.33028   0.44862 )
Epeak [keV] : 25.7908      (   )
Norm@50keV  : 5.26667E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8148 for     56 degrees of freedom 
# Null hypothesis probability =   8.374539e-01
 
Photon flux (15-150 keV)    in 28.18 sec: 0.331343 ( -0.044697  0.044795 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00781e-07 ( -8.94969e-08  9.82806e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.51849   ( 1.51851   1.51851 )
beta        : -3.28384    ( 3.35556   10.7045 )
Epeak [keV] : 26.0878      ( -26.0904 16.554 )
Norm@50keV   : 5.44304E-03    ( -0.00314694   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.62 using 59 PHA bins.
# Reduced chi-squared =         0.8295 for     55 degrees of freedom 
# Null hypothesis probability =   8.122778e-01
 
Photon flux (15-150 keV)    in 28.18 sec:  (    ) 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)  = 1.70e-07
S(50-100 keV) = 1.45e-07

T90 vs. Hardness ratio plot

T90                                   = 24.3359999656677 sec.
Hardness ratio (energy fluence ratio) = 0.852941

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.990103
Count Ratio (50-100 keV) / (15-25 keV) = 0.480681

Mask shadow pattern

IMX = -6.333327799551866E-01, IMY = -4.190438209869349E-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:
-63.603400 -17.636000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.2660  40.9006   10.5  48.7  -43.7  -0.2463  -1.1    7.7	Cyg X-3                       
326.1872  38.1970    6.0  35.6  -51.2   0.1852   1.9    7.5	Cyg X-2                       
 40.4090  62.6001    2.5  34.2   43.2   0.4799   4.6 ------	UNKNOWN                       
 27.0051  -3.5422    2.6  40.7  173.0   0.4505   4.4 ------	UNKNOWN                       
 23.6430 -22.8729    2.7  58.3 -175.4   1.6455   4.3 ------	UNKNOWN

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

Time interval of the image:
-17.636000 10.544000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1059  40.9036    5.3  48.8  -43.6   0.4538   2.2    2.9	Cyg X-3                       
326.3884  38.3210    6.6  35.4  -51.0  -0.1517  -1.8   10.2	Cyg X-2                       
 58.2308  35.0339    1.9  39.1   93.5   1.4603   6.0 ------	UNKNOWN                       
 39.3072   8.0643    1.2  37.2  146.5   0.9765   9.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
411.896610 962.324800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 21.0265  40.6988    2.6  36.4   -4.2   1.7602   4.4 ------	UNKNOWN                       
 26.2867  31.2668    3.5  26.2   -6.4   0.9661   3.3 ------	UNKNOWN                       
 57.8779 -47.8163    2.8  58.3 -175.2   7.4336   4.1 ------	UNKNOWN                       
  6.6485 -20.8370    2.2  43.2 -113.2   7.2336   5.2 ------	UNKNOWN

Plot creation:
Thu May 28 13:38:12 EDT 2015