batgrbproduct analysis for trigger=113872

batgrbproduct Analysis for Trigger=113872

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 Jan 22 22:31:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger113872
======================================================================

  Trigger: 00113872      Segment: 000

  BAT Trigger Time: 134495927.872   [s; MET]
      Trigger Stop: 134495929.92   [s; MET]
               UTC: 2005-04-06T15:58:48.407200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 34.4284384928714   Dec: -50.1778978956069  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     9.48683298050514  [ if not an image trigger ]
     Image S/N Ratio:    8

  Flight Position:   [ source = BAT ]
    RA: 34.4284384928714   Dec: -50.1778978956069  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 34.4170333024344   Dec: -50.181327992157  [deg; J2000]  
        { 02h 17m 40.1s , -50d 10' 52.8" }
         +/- 2.48753495928318 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.971760891788176 [arcmin] (formal 1-sigma fit error)
    SNR: 8.27434869107593
 
  Angular difference between Flight and Ground position is 0.484143 arcmin
 
  Partial Coding Fraction: 0.953125    [ including projection effects ]

  Duration
     T90: 5.77600002288818 +/- 1.39300683998906
        Measured from: -2.08000001311302
                   to: 3.69600000977516     [s; relative to TRIGTIME]
     T50: 2.23199999332428 +/- 1.38538804675014
        Measured from: -0.159999996423721
                   to: 2.07199999690056     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.19599997997284     
                   to: 2.19599997997284     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.50400000810623     
                   to: 3.89599999785423     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.080240   0.079122   0.010062   0.008930
           0.010812   0.011175   0.009492   0.008004 [error]
 Peak      0.022429   0.018200   0.002851   0.003143
           0.004452   0.004424   0.003737   0.003254 [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 2.39e-08 2.55e-08 1.93e-08 2.37e-08 7.77e-08 9.23e-08   erg/cm2
              Error 4.64e-09 5.04e-09 7.19e-09 1.62e-08 1.74e-08 2.73e-08   erg/cm2
Peak flux Power-law 1.86e-01 1.07e-01 3.89e-02 1.87e-02 3.42e-01 3.50e-01   ph/cm2/s
              Error 5.98e-02 3.53e-02 2.39e-02 2.36e-02 9.85e-02 1.03e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.21e-08 3.38e-08 1.07e-08 3.33e-10 6.70e-08 6.70e-08   erg/cm2
              Error 5.39e-09 7.56e-09 7.95e-09 2.17e-09 1.38e-08 1.38e-08   erg/cm2
Peak flux Cutoff-PL 1.89e-01 1.36e-01 1.01e-02 2.00e-05 3.35e-01 3.35e-01   ph/cm2/s
              Error 6.85e-02 5.34e-02 2.40e-02 6.45e-03 9.27e-02 9.27e-02   ph/cm2/s
 
Fluence        Band 2.19e-08 3.37e-08 1.09e-08 4.33e-10 6.83e-08 6.71e-08   erg/cm2
              Error 5.35e-09 7.52e-09 7.45e-09 -------- -------- --------   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    2.403    0.341    -      -           1.24e-03 3.47e-04   73.600 57
CPL  -0.405    2.385      29.3    6.1      8.25e-02 3.95e+00   65.650 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.458    0.586    -      -           1.79e-03 8.53e-04   53.010 57
CPL  -2.080    0.983      25.7   17.2      3.06e+00 0.00e+00   49.790 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    6.400   -2.504    3.896
T90     5.776   -2.080    3.696
T50     2.232   -0.160    2.072
Peak    1.000    1.196    2.196

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
   34.4170   -50.1813   0.0232    15.0594    33.8905         0.1729934      8.274 TRIG_00113872                 
 
Foreground time interval of the image:
 -2.504   3.896 (delta_t =   6.400 [sec])
Background time interval of the image:
-299.872  -2.504 (delta_t = 297.368 [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   -2.504 sec. to    3.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.40285     ( -0.316967   0.364618 )
Norm@50keV  : 1.24363E-03    ( -0.000345836   0.0003488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.60 using 59 PHA bins.
# Reduced chi-squared =          1.291 for     57 degrees of freedom 
# Null hypothesis probability =   6.864064e-02
 
Photon flux (15-150 keV)    in 6.4 sec: 0.230472 ( -0.0393424  0.0394242 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.76691e-08 ( -1.68505e-08  1.79506e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.504 sec. to    3.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.404829     ( -2.99327   1.77768 )
Epeak [keV] : 29.3470      ( -6.16188 6.11384 )
Norm@50keV  : 8.24765E-02    ( -0.0912856   7.81682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.65 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     56 degrees of freedom 
# Null hypothesis probability =   1.771413e-01
 
Photon flux (15-150 keV)    in 6.4 sec: 0.224812 ( -0.03768  0.037945 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.70432e-08 ( -1.28701e-08  1.46458e-08 ) ergs/cm2

Band function

Time interval is from   -2.504 sec. to    3.896 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.608068   ( -1.84281   2.94329 )
beta        : -10.0000    ( 10   3.55271e-15 )
Epeak [keV] : 29.6692      ( -9.89787 5.83657 )
Norm@50keV   : 0.111182    ( -0.112284   7.59669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.62 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     55 degrees of freedom 
# Null hypothesis probability =   1.547109e-01
 
Photon flux (15-150 keV)    in 6.4 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.82976e-08 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 7.82857  (-1.16477  1.30898)
R^2/D10^2   : 0.301196  (-0.139821   0.270792)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.94 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.952997e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.101e-08   6.739e-09
25- 50  3.541e-08   9.869e-09
50-150  8.653e-09   4.850e-09
15-150  6.507e-08   1.734e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 33.3569       (-10.1939      16.5957)
Norm        : 1.75281       (-0.470568     0.677713)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.34 using 59 PHA bins.
# Reduced chi-squared =          1.199 for     57 degrees of freedom 
# Null hypothesis probability =   1.445098e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.401e-08   5.424e-09
25- 50  2.902e-08   6.986e-09
50-150  1.818e-08   1.102e-08
15-150  7.121e-08   2.107e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.91020        (-2.87684      11.227)
R1^2/D10^2  : 5.39848        (-6.04718      -6.04718)
kT2 [keV]   : 8.61957        (-1.65888      -8.57951)
R2^2/D10^2  : 0.185740    (-0.191482   0.300609)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.86 using 59 PHA bins.
# Reduced chi-squared =          1.179 for     55 degrees of freedom 
# Null hypothesis probability =   1.705760e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.212e-08   1.161e-08
25- 50  3.400e-08   1.993e-08
50-150  1.111e-08   6.954e-09
15-150  6.724e-08   3.651e-08

Peak spectrum fit

Power-law model

Time interval is from    1.196 sec. to    2.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.45752     ( -0.52224   0.649458 )
Norm@50keV  : 1.78545E-03    ( -0.000833327   0.000873598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.01 using 59 PHA bins.
# Reduced chi-squared =         0.9301 for     57 degrees of freedom 
# Null hypothesis probability =   6.253061e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.341782 ( -0.0982779  0.0988015 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.76517e-08 ( -6.29362e-09  7.07189e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.196 sec. to    2.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.07958     ( 0.867434   2.83272 )
Epeak [keV] : 25.7258      ( -25.416 9.01362 )
Norm@50keV  : 3.06105    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.79 using 59 PHA bins.
# Reduced chi-squared =         0.8890 for     56 degrees of freedom 
# Null hypothesis probability =   7.077612e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.334837 ( -0.092218  0.093244 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.403e-08 ( -4.44505e-09  5.9632e-09 ) ergs/cm2

Band function

Time interval is from    1.196 sec. to    2.196 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.21216   ( 1.67067   1.67067 )
beta        : -10.0000    ( 10   1.06581e-14 )
Epeak [keV] : 25.7773      ( -6.60396 8.85697 )
Norm@50keV   : 3.80714    ( -1.02822   203.271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.79 using 59 PHA bins.
# Reduced chi-squared =         0.9053 for     55 degrees of freedom 
# Null hypothesis probability =   6.733075e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51158e-08 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 6.58782  (-1.54539  2.00791)
R^2/D10^2   : 0.905867  (-0.905868   1.86423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.82 using 59 PHA bins.
# Reduced chi-squared =         0.8739 for     57 degrees of freedom 
# Null hypothesis probability =   7.390155e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.904e-09   3.520e-09
25- 50  7.167e-09   4.352e-09
50-150  9.487e-10   7.888e-10
15-150  1.402e-08   8.715e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 28.2145       (-12.5691      29.7938)
Norm        : 2.98378       (-1.30002     2.55218)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.12 using 59 PHA bins.
# Reduced chi-squared =         0.8969 for     57 degrees of freedom 
# Null hypothesis probability =   6.941349e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.877e-09   2.736e-09
25- 50  6.486e-09   3.668e-09
50-150  3.272e-09   2.749e-09
15-150  1.564e-08   9.069e-09

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 23.7275        (      )
R1^2/D10^2  : 5.51101E-04        (-0.00065084      -0.00065084)
kT2 [keV]   : 6.39715        (-6.38737      2.16772)
R2^2/D10^2  : 0.993830    (-0.99812   -0.99812)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.77 using 59 PHA bins.
#Fit statistic : Chi-Squared =          49.74 using 59 PHA bins.
# Reduced chi-squared =         0.9048 for     55 degrees of freedom 
# Reduced chi-squared =         0.9044 for     55 degrees of freedom 
# Null hypothesis probability =   6.742226e-01
# Null hypothesis probability =   6.751886e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.941e-09   1.232e-07
25- 50  7.065e-09   4.485e-07
50-150  1.380e-09   2.371e-06
15-150  1.439e-08   3.259e-06

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: 2.40285     ( -0.316967   0.364618 )
Norm@50keV  : 1.24363E-03    ( -0.000345836   0.0003488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.60 using 59 PHA bins.
# Reduced chi-squared =          1.291 for     57 degrees of freedom 
# Null hypothesis probability =   6.864064e-02
 
Photon flux (15-150 keV)    in 6.4 sec: 0.230472 ( -0.0393424  0.0394242 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.76691e-08 ( -1.68505e-08  1.79506e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.404829     ( -2.99327   1.77768 )
Epeak [keV] : 29.3470      ( -6.16188 6.11384 )
Norm@50keV  : 8.24765E-02    ( -0.0912856   7.81682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.65 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     56 degrees of freedom 
# Null hypothesis probability =   1.771413e-01
 
Photon flux (15-150 keV)    in 6.4 sec: 0.224812 ( -0.03768  0.037945 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.70432e-08 ( -1.28701e-08  1.46458e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.608068   ( -1.84281   2.94329 )
beta        : -10.0000    ( 10   7.10543e-15 )
Epeak [keV] : 29.6692      ( -9.89787 5.83657 )
Norm@50keV   : 0.111182    ( -0.112284   7.59669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.62 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     55 degrees of freedom 
# Null hypothesis probability =   1.547109e-01
 
Photon flux (15-150 keV)    in 6.4 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.82976e-08 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 2.55e-08
S(50-100 keV) = 1.93e-08

T90 vs. Hardness ratio plot

T90                                   = 5.77600002288818 sec.
Hardness ratio (energy fluence ratio) = 0.756863

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.986067
Count Ratio (50-100 keV) / (15-25 keV) = 0.125399

Mask shadow pattern

IMX = 2.233481792364259E-01, IMY = -1.500302450856418E-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:
-299.872000 -2.504000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 82.3545 -37.2513    2.6  50.4   16.5   2.0775   4.4 ------	UNKNOWN                       
349.2642  -2.1926    2.4  46.8 -127.7   3.0850   4.8 ------	UNKNOWN

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

Time interval of the image:
-2.504000 3.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 34.4170 -50.1813    1.4  15.1   33.9   0.1730   8.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
70.628610 302.179400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
313.3847 -35.3205    2.8  58.3 -176.8   3.5344   4.1 ------	UNKNOWN                       
 22.9539 -21.5017    2.9  30.1  -89.8   0.8176   4.0 ------	UNKNOWN                       
 72.0504  -0.6922    3.1  58.9  -22.6   3.6428   3.7 ------	UNKNOWN

Plot creation:
Sun May 31 17:07:09 EDT 2015