batgrbproduct analysis for trigger=228316

batgrbproduct Analysis for Trigger=228316

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 13:48:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger228316
======================================================================

  Trigger: 00228316      Segment: 000

  BAT Trigger Time: 179224368   [s; MET]
      Trigger Stop: 179224432   [s; MET]
               UTC: 2006-09-06T08:32:46.573080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Flight Position:   [ source = BAT ]
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 40.7119716223741   Dec: 30.3561616373423  [deg; J2000]  
        { 02h 42m 50.9s , +30d 21' 22.2" }
         +/- 2.30678805573973 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.00649717813953 [arcmin] (formal 1-sigma fit error)
    SNR: 9.2158619370197
 
  Angular difference between Flight and Ground position is 1.934285 arcmin
 
  Partial Coding Fraction: 0.453125    [ including projection effects ]

  Duration
     T90: 44.5879999995232 +/- 2.59449571961208
        Measured from: -39.9280000030994
                   to: 4.65999999642372     [s; relative to TRIGTIME]
     T50: 17.0960000157356 +/- 2.35680543187746
        Measured from: -32.3000000119209
                   to: -15.2039999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -24.8120000064373     
                   to: -23.8120000064373     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -41.7960000038147     
                   to: 8.30000001192093     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.317647   1.496176   0.845607   0.203501
           0.066231   0.069054   0.059785   0.050217 [error]
 Peak      0.073020   0.083412   0.053519   0.001752
           0.009681   0.010371   0.008645   0.006966 [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 4.97e-07 6.84e-07 6.94e-07 1.28e-06 2.29e-06 3.16e-06   erg/cm2
              Error 4.30e-08 3.75e-08 6.00e-08 2.26e-07 1.39e-07 2.84e-07   erg/cm2
Peak flux Power-law 8.78e-01 6.59e-01 3.30e-01 2.36e-01 1.98e+00 2.10e+00   ph/cm2/s
              Error 1.73e-01 8.96e-02 7.22e-02 9.80e-02 2.71e-01 2.87e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.70e-07 7.15e-07 6.96e-07 6.59e-07 2.20e-06 2.54e-06   erg/cm2
              Error 5.00e-08 4.81e-08 6.43e-08 4.32e-07 1.59e-07 4.61e-07   erg/cm2
Peak flux Cutoff-PL 8.34e-01 6.98e-01 3.36e-01 1.34e-01 1.95e+00 2.00e+00   ph/cm2/s
              Error 1.97e-01 1.20e-01 7.84e-02 1.37e-01 2.76e-01 3.27e-01   ph/cm2/s
 
Fluence        Band 4.55e-07 7.24e-07 6.71e-07 1.06e-06 2.22e-06 2.92e-06   erg/cm2
              Error -------- -------- 6.48e-08 -------- 1.88e-07 --------   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    1.979    0.104    -      -           4.95e-03 3.12e-04   56.530 57
CPL   1.550    0.427      47.8   30.9      8.44e-03 4.75e-03   53.230 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.997    0.249    -      -           1.32e-02 2.20e-03   66.830 57
CPL   1.533    0.916      44.6    0.0      2.40e-02 0.00e+00   66.170 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   50.096  -41.796    8.300
T90    44.588  -39.928    4.660
T50    17.096  -32.300  -15.204
Peak    1.000  -24.812  -23.812

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
   40.7120    30.3562   0.0208    35.2814   152.1794         0.4788870      9.216 TRIG_00228316                 
 
Foreground time interval of the image:
 -6.499   8.300 (delta_t =  14.799 [sec])
Background time interval of the image:

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 64.000000

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 64.000000

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 64.000000

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  -41.796 sec. to    8.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97866     ( -0.102378   0.104827 )
Norm@50keV  : 4.95226E-03    ( -0.000313358   0.000310094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.53 using 59 PHA bins.
# Reduced chi-squared =         0.9917 for     57 degrees of freedom 
# Null hypothesis probability =   4.927135e-01
 
Photon flux (15-150 keV)    in 50.1 sec: 0.735644 ( -0.0418099  0.0418887 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28568e-06 ( -1.38616e-07  1.39458e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -41.796 sec. to    8.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.54954     ( -0.449704   0.405101 )
Epeak [keV] : 47.8026      ( -18.9669 42.7774 )
Norm@50keV  : 8.44217E-03    ( -0.00327532   0.00622699 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.23 using 59 PHA bins.
# Reduced chi-squared =         0.9506 for     56 degrees of freedom 
# Null hypothesis probability =   5.802361e-01
 
Photon flux (15-150 keV)    in 50.1 sec: 0.719115 ( -0.044426  0.044477 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20471e-06 ( -1.58271e-07  1.58747e-07 ) ergs/cm2

Band function

Time interval is from  -41.796 sec. to    8.300 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.54953   ( -0.217912   0.558544 )
beta        : -10.00000    ( 10   4.08562e-14 )
Epeak [keV] : 47.7934      ( -10.3978 43.2111 )
Norm@50keV   : 8.44074E-03    ( -0.00046077   0.00623005 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.23 using 59 PHA bins.
# Reduced chi-squared =         0.9679 for     55 degrees of freedom 
# Null hypothesis probability =   5.423897e-01
 
Photon flux (15-150 keV)    in 50.1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21992e-06 ( -2.21957e-06  -1.49258e-07 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.9173  (  )
R^2/D10^2   : 0.237695  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         123.83 using 59 PHA bins.
# Reduced chi-squared =         2.1724 for     57 degrees of freedom 
# Null hypothesis probability =   7.461323e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.961e-07   3.089e-08
25- 50  8.292e-07   5.085e-08
50-150  5.550e-07   7.708e-08
15-150  1.680e-06   1.055e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 74.7522       (-12.1591      16.0506)
Norm        : 3.48618       (-0.312698     0.350819)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.98 using 59 PHA bins.
# Reduced chi-squared =         0.9470 for     57 degrees of freedom 
# Null hypothesis probability =   5.891283e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.509e-07   3.597e-08
25- 50  7.299e-07   3.908e-08
50-150  9.832e-07   1.132e-07
15-150  2.164e-06   1.440e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.27916        (-1.02261      1.08851)
R1^2/D10^2  : 1.40473        (-0.596866      1.28185)
kT2 [keV]   : 21.1355        (-3.78302      6.04272)
R2^2/D10^2  : 1.32939E-02    (-0.00830374   0.0167909)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.50 using 59 PHA bins.
# Reduced chi-squared =         0.9728 for     55 degrees of freedom 
# Null hypothesis probability =   5.320352e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.485e-07   9.749e-08
25- 50  7.207e-07   1.122e-07
50-150  1.011e-06   3.082e-07
15-150  2.180e-06   4.476e-07

Peak spectrum fit

Power-law model

Time interval is from  -24.812 sec. to  -23.812 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99727     ( -0.238758   0.258626 )
Norm@50keV  : 1.32002E-02    ( -0.00223911   0.00216705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.83 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     57 degrees of freedom 
# Null hypothesis probability =   1.752132e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.97755 ( -0.270793  0.270921 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21714e-07 ( -1.92515e-08  1.95571e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -24.812 sec. to  -23.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53339     ( -1.16329   0.668167 )
Epeak [keV] : 44.6085      (   )
Norm@50keV  : 2.40114E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.17 using 59 PHA bins.
# Reduced chi-squared =          1.182 for     56 degrees of freedom 
# Null hypothesis probability =   1.659052e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.95205 ( -0.27643  0.27583 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1795e-07 ( -2.0592e-08  2.1071e-08 ) ergs/cm2

Band function

Time interval is from  -24.812 sec. to  -23.812 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.49592   ( 0.700273   0.700273 )
beta        : -2.64062    ( 2.64124   10.0083 )
Epeak [keV] : 44.2167      ( -44.2777 -44.2777 )
Norm@50keV   : 2.52603E-02    ( -0.0140772   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.15 using 59 PHA bins.
# Reduced chi-squared =          1.203 for     55 degrees of freedom 
# Null hypothesis probability =   1.443495e-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]    : 10.5342  (-1.69923  1.98503)
R^2/D10^2   : 0.763466  (-0.367701   0.723886)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.97 using 59 PHA bins.
# Reduced chi-squared =          1.386 for     57 degrees of freedom 
# Null hypothesis probability =   2.862174e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.753e-08   4.730e-09
25- 50  4.682e-08   9.435e-09
50-150  2.835e-08   1.021e-08
15-150  9.270e-08   1.897e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 70.6800       (-23.5181      44.1286)
Norm        : 9.72733       (-1.92717     2.38834)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.30 using 59 PHA bins.
# Reduced chi-squared =          1.163 for     57 degrees of freedom 
# Null hypothesis probability =   1.868280e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.498e-08   4.385e-09
25- 50  3.985e-08   6.040e-09
50-150  5.155e-08   2.094e-08
15-150  1.164e-07   2.525e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.20553        (-2.40532      2.7785)
R1^2/D10^2  : 7.28057        (-5.54488      111.282)
kT2 [keV]   : 17.4755        (-5.07505      14.0883)
R2^2/D10^2  : 8.17114E-02    (-0.0713935   0.261564)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.66 using 59 PHA bins.
# Reduced chi-squared =          1.212 for     55 degrees of freedom 
# Null hypothesis probability =   1.347323e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.579e-08   1.407e-08
25- 50  3.774e-08   1.948e-08
50-150  5.087e-08   3.070e-08
15-150  1.144e-07   5.910e-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: 2.13747     ( -0.382217   0.449961 )
Norm@50keV  : 1.68722E-03    ( -0.000484369   0.000449858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.57 using 59 PHA bins.
# Reduced chi-squared =          1.045 for     57 degrees of freedom 
# Null hypothesis probability =   3.823195e-01
 
Photon flux (15-150 keV)    in 14.8 sec: 0.270459 ( -0.0511574  0.0511586 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32914e-07 ( -5.57032e-08  5.78948e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97437     (     )
Epeak [keV] : 9.95374      (   )
Norm@50keV  : 2.00065E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.78 using 59 PHA bins.
# Reduced chi-squared =          1.068 for     56 degrees of freedom 
# Null hypothesis probability =   3.400538e-01
 
Photon flux (15-150 keV)    in 14.8 sec: 0.270389 ( -0.051304  0.05115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32939e-07 ( -5.60506e-08  5.78784e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -5.54046   ( 5.54046   5.54046 )
beta        : -2.13756    ( -0.449875   0.382393 )
Epeak [keV] : 16.0607      ( -16.0607 -16.0607 )
Norm@50keV   : 0.229307    ( -0.0658228   0.0611518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.57 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     55 degrees of freedom 
# Null hypothesis probability =   3.129996e-01
 
Photon flux (15-150 keV)    in 14.8 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)  = 6.84e-07
S(50-100 keV) = 6.94e-07

T90 vs. Hardness ratio plot

T90                                   = 44.5879999995232 sec.
Hardness ratio (energy fluence ratio) = 1.01462

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.13549
Count Ratio (50-100 keV) / (15-25 keV) = 0.641755

Mask shadow pattern

IMX = -6.257692935479964E-01, IMY = -3.302189153698654E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:

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

Time interval of the image:
-6.499390 8.300000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6023  22.0158    1.0  33.6 -135.2   0.5580  11.8    1.7	Crab                          
 24.9675 -22.7287    2.2  39.1   52.3   0.4801   5.4 ------	UNKNOWN                       
 40.7120  30.3562    1.2  35.3  152.2   0.4788   9.2 ------	UNKNOWN                       
 65.6703 -45.3591    2.0  45.1   -8.4   0.3549   5.8 ------	UNKNOWN                       
 99.0355   1.6719    3.0  40.9  -94.5   0.5356   3.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
132.500590 263.982600
265.000000 963.063900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6376  22.0286    0.4  39.1  -63.4  33.8794  28.4    0.9	Crab                          
351.2122  47.7272    2.8  41.4  154.0   3.6969   4.2 ------	UNKNOWN                       
 48.2942  23.7899    3.2   9.4  -22.6   1.3391   3.6 ------	UNKNOWN                       
 67.4112 -12.0716    2.7  49.6  -10.4   3.6140   4.2 ------	UNKNOWN                       
 76.0150   6.2449    2.7  40.9  -36.3   2.9755   4.3 ------	UNKNOWN                       
 84.4126  -4.5530    4.2  54.4  -33.0   6.2117   2.7 ------	UNKNOWN

Plot creation:
Sun May 31 12:09:06 EDT 2015