batgrbproduct analysis for trigger=331475

batgrbproduct Analysis for Trigger=331475

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): Sun Jan 19 21:46:17 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger331475
======================================================================

  Trigger: 00331475      Segment: 000

  BAT Trigger Time: 245509827.072   [s; MET]
      Trigger Stop: 245509829.12   [s; MET]
               UTC: 2008-10-12T13:10:23.902940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 30.2174055107331   Dec: -17.6414535051542  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.78
     Image Trigger?:     NO
     Rate S/N Ratio:     17.606816861659  [ if not an image trigger ]
     Image S/N Ratio:    7.78

  Flight Position:   [ source = BAT ]
    RA: 30.2174055107331   Dec: -17.6414535051542  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 30.1859159943555   Dec: -17.6295771472817  [deg; J2000]  
        { 02h 00m 44.6s , -17d 37' 46.5" }
         +/- 1.65649603543404 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.710847033993027 [arcmin] (formal 1-sigma fit error)
    SNR: 14.790717288235
 
  Angular difference between Flight and Ground position is 1.936452 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 28.972000002861 +/- 4.52475237177407
        Measured from: -21.0839999914169
                   to: 7.88800001144409     [s; relative to TRIGTIME]
     T50: 9.97200000286102 +/- 6.14550504651901
        Measured from: -7.0959999859333
                   to: 2.87600001692772     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.464000016450882     
                   to: 1.46400001645088     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -23.4600000083447     
                   to: 9.31999999284744     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.168633   0.535643   0.550150   0.232582
           0.050627   0.054299   0.050148   0.043944 [error]
 Peak      0.026922   0.042084   0.070951   0.016936
           0.009072   0.010147   0.010309   0.008341 [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 7.89e-08 2.02e-07 4.17e-07 2.18e-06 1.12e-06 2.88e-06   erg/cm2
              Error 1.78e-08 2.74e-08 4.63e-08 5.64e-07 1.23e-07 5.82e-07   erg/cm2
Peak flux Power-law 2.22e-01 3.39e-01 3.88e-01 8.48e-01 1.20e+00 1.80e+00   ph/cm2/s
              Error 9.58e-02 9.01e-02 7.65e-02 3.70e-01 2.40e-01 3.98e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.83e-08 2.09e-07 4.42e-07 1.14e-06 1.10e-06 1.85e-06   erg/cm2
              Error 2.22e-08 3.03e-08 5.80e-08 -------- 1.31e-07 1.08e-06   erg/cm2
Peak flux Cutoff-PL 1.89e-01 3.45e-01 4.15e-01 5.14e-01 1.18e+00 1.46e+00   ph/cm2/s
              Error 1.19e-01 9.85e-02 1.02e-01 6.13e-01 2.48e-01 5.73e-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    0.958    0.184    -      -           3.12e-03 3.38e-04   59.630 57
CPL   0.412    0.786     170.7    0.0      5.39e-03 0.00e+00   58.050 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.805    0.345    -      -           1.04e-02 2.14e-03   55.290 57
CPL   0.248    1.431     189.5    0.0      1.80e-02 5.22e-02   54.860 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: 12.800000 sec.
T50 in the 50-300 keV band: 5.760000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   32.780  -23.460    9.320
T90    28.972  -21.084    7.888
T50     9.972   -7.096    2.876
Peak    1.000    0.464    1.464

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
   30.1859   -17.6296   0.0129    33.5823    69.7306         1.6088931     14.791 TRIG_00331475                 
 
Foreground time interval of the image:
-23.460   9.320 (delta_t =  32.780 [sec])
Background time interval of the image:
-263.771 -23.460 (delta_t = 240.311 [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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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  -23.460 sec. to    9.320 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.957979     ( -0.188244   0.180399 )
Norm@50keV  : 3.12414E-03    ( -0.000339357   0.000336501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.63 using 59 PHA bins.
# Reduced chi-squared =          1.046 for     57 degrees of freedom 
# Null hypothesis probability =   3.800906e-01
 
Photon flux (15-150 keV)    in 32.78 sec: 0.359016 ( -0.0394031  0.0396099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12439e-06 ( -1.23132e-07  1.23554e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -23.460 sec. to    9.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.412161     ( -0.885797   0.686351 )
Epeak [keV] : 170.656      (   )
Norm@50keV  : 5.39141E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.05 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     56 degrees of freedom 
# Null hypothesis probability =   3.995280e-01
 
Photon flux (15-150 keV)    in 32.78 sec: 0.350902 ( -0.040973  0.041067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09812e-06 ( -1.32185e-07  1.30353e-07 ) ergs/cm2

Band function

Time interval is from  -23.460 sec. to    9.320 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.92538   ( -2.54406   -4.92538 )
beta        : -1.11050    ( -0.256978   0.227329 )
Epeak [keV] : 35.0355      ( -11.2113 19.2339 )
Norm@50keV   : 27.4279    ( -2.82276   271.993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.78 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     55 degrees of freedom 
# Null hypothesis probability =   4.086769e-01
 
Photon flux (15-150 keV)    in 32.78 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]    : 22.7794  (-2.97648  3.71273)
R^2/D10^2   : 1.16809E-02  (-0.00441388   0.00660848)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.14 using 59 PHA bins.
# Reduced chi-squared =          1.178 for     57 degrees of freedom 
# Null hypothesis probability =   1.684896e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.618e-08   7.475e-09
25- 50  1.952e-07   3.360e-08
50-150  7.568e-07   1.364e-07
15-150  9.882e-07   1.480e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.49498       (-0.164355     0.164333)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          88.14 using 59 PHA bins.
# Reduced chi-squared =          1.546 for     57 degrees of freedom 
# Null hypothesis probability =   5.102877e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.221e-07   5.822e-08
25- 50  2.348e-07   1.289e-07
50-150  5.150e-07   2.831e-07
15-150  8.719e-07   4.789e-07

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 11.6530        (-5.69463      6.62765)
R1^2/D10^2  : 5.37241E-02        (      )
kT2 [keV]   : 42.3929        (-36.7857      -42.596)
R2^2/D10^2  : 1.35351E-03    (-0.00127727   0.0064001)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.70 using 59 PHA bins.
#Fit statistic : Chi-Squared =          57.68 using 59 PHA bins.
# Reduced chi-squared =          1.049 for     55 degrees of freedom 
# Reduced chi-squared =          1.049 for     55 degrees of freedom 
# Null hypothesis probability =   3.758488e-01
# Null hypothesis probability =   3.764846e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.124e-08   3.498e-08
25- 50  2.208e-07   1.178e-07
50-150  8.233e-07   4.237e-07
15-150  1.105e-06   5.612e-07

Peak spectrum fit

Power-law model

Time interval is from    0.464 sec. to    1.464 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.804901     ( -0.35923   0.33017 )
Norm@50keV  : 1.04434E-02    ( -0.00216126   0.00211217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.29 using 59 PHA bins.
# Reduced chi-squared =         0.9700 for     57 degrees of freedom 
# Null hypothesis probability =   5.393908e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.20009 ( -0.239537  0.240936 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21789e-07 ( -2.46976e-08  2.48618e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.464 sec. to    1.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.248271     ( -2.02144   0.841153 )
Epeak [keV] : 189.469      ( -189.47 -189.47 )
Norm@50keV  : 1.79832E-02    ( -0.00935278   0.0950931 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.86 using 59 PHA bins.
# Reduced chi-squared =         0.9797 for     56 degrees of freedom 
# Null hypothesis probability =   5.180004e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.17787 ( -0.247967  0.24763 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.19451e-07 ( -2.68382e-08  2.591e-08 ) ergs/cm2

Band function

Time interval is from    0.464 sec. to    1.464 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.772117   ( 0.771834   0.771834 )
beta        : -0.805078    ( -0.330027   0.359203 )
Epeak [keV] : 16.6051      (   )
Norm@50keV   : 1.50178E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.29 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     55 degrees of freedom 
# Null hypothesis probability =   4.635750e-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]    : 24.6753  (-5.57693  8.74184)
R^2/D10^2   : 3.20319E-02  (-0.0189967   0.0385241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.84 using 59 PHA bins.
# Reduced chi-squared =         0.9972 for     57 degrees of freedom 
# Null hypothesis probability =   4.810811e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.412e-09   1.379e-09
25- 50  1.922e-08   7.313e-09
50-150  8.695e-08   3.336e-08
15-150  1.096e-07   3.866e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 4.75191       (-1.00054     1.00049)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.30 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     57 degrees of freedom 
# Null hypothesis probability =   1.452736e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.183e-08   7.110e-09
25- 50  2.276e-08   1.326e-08
50-150  4.991e-08   2.964e-08
15-150  8.450e-08   4.971e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 16.7123        (-15.916      11.0569)
R1^2/D10^2  : 7.86680E-02        (-0.0850145      -0.0850145)
kT2 [keV]   : 200.000        (      )
R2^2/D10^2  : 1.91112E-04    (-0.00019112   -0.00019112)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.34 using 59 PHA bins.
#Fit statistic : Chi-Squared =          54.25 using 59 PHA bins.
# Reduced chi-squared =         0.9880 for     55 degrees of freedom 
# Reduced chi-squared =         0.9864 for     55 degrees of freedom 
# Null hypothesis probability =   4.998638e-01
# Null hypothesis probability =   5.032169e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.835e-09   3.004e-09
25- 50  2.168e-08   1.351e-08
50-150  9.100e-08   4.681e-08
15-150  1.175e-07   7.060e-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: 0.957979     ( -0.188244   0.180399 )
Norm@50keV  : 3.12414E-03    ( -0.000339357   0.000336501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.63 using 59 PHA bins.
# Reduced chi-squared =          1.046 for     57 degrees of freedom 
# Null hypothesis probability =   3.800906e-01
 
Photon flux (15-150 keV)    in 32.78 sec: 0.359016 ( -0.0394031  0.0396099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12439e-06 ( -1.23132e-07  1.23554e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.412161     ( -0.885797   0.686351 )
Epeak [keV] : 170.656      (   )
Norm@50keV  : 5.39141E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.05 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     56 degrees of freedom 
# Null hypothesis probability =   3.995280e-01
 
Photon flux (15-150 keV)    in 32.78 sec: 0.350902 ( -0.040973  0.041067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09812e-06 ( -1.32185e-07  1.30353e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.92538   ( -0.525365   -4.92538 )
beta        : -1.11050    ( -0.256978   0.227329 )
Epeak [keV] : 35.0355      ( -11.2113 19.2339 )
Norm@50keV   : 27.4279    ( -2.82276   271.993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.78 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     55 degrees of freedom 
# Null hypothesis probability =   4.086769e-01
 
Photon flux (15-150 keV)    in 32.78 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)  = 2.02e-07
S(50-100 keV) = 4.17e-07

T90 vs. Hardness ratio plot

T90                                   = 28.972000002861 sec.
Hardness ratio (energy fluence ratio) = 2.06436

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 3.17638
Count Ratio (50-100 keV) / (15-25 keV) = 3.26241

Mask shadow pattern

IMX = 2.300166331368824E-01, IMY = -6.228385430983757E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-263.771410 -23.460000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 59.6711 -27.1443    2.7  10.2  124.5   0.5925   4.3 ------	UNKNOWN                       
321.6138 -72.5157    3.7  57.5  -26.9   3.2219   3.2 ------	UNKNOWN

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

Time interval of the image:
-23.460000 9.320000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 30.1859 -17.6296    0.8  33.6   69.7   1.6083  14.8 ------	UNKNOWN                       
 22.1163 -60.9765    2.2  34.1  -14.3   0.3300   5.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
301.828600 633.628600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
179.7047  52.6458    3.6  40.6 -172.9   0.9833   3.2 ------	UNKNOWN                       
212.2769  53.7468    4.0  57.4 -160.1   3.6691   2.9 ------	UNKNOWN                       
178.2131 -27.6402    3.9  50.7  -44.5   3.1873   3.0 ------	UNKNOWN

Plot creation:
Sun May 31 05:58:12 EDT 2015