batgrbproduct analysis for trigger=302506

batgrbproduct Analysis for Trigger=302506

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): Mon Jan 20 04:54:09 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger302506
======================================================================

  Trigger: 00302506      Segment: 000

  BAT Trigger Time: 223890954.304   [s; MET]
      Trigger Stop: 223890955.328   [s; MET]
               UTC: 2008-02-05T07:55:51.751640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 98.2192547486492   Dec: 62.7686859637972  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.53
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0996688705415  [ if not an image trigger ]
     Image S/N Ratio:    8.53

  Flight Position:   [ source = BAT ]
    RA: 98.2192547486492   Dec: 62.7686859637972  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 98.2610086338524   Dec: 62.7784563195902  [deg; J2000]  
        { 06h 33m 02.6s , +62d 46' 42.4" }
         +/- 1.50929342618172 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.739362038112901 [arcmin] (formal 1-sigma fit error)
    SNR: 16.8938023144618
 
  Angular difference between Flight and Ground position is 1.287380 arcmin
 
  Partial Coding Fraction: 0.5234375    [ including projection effects ]

  Duration
     T90: 106.296000003815 +/- 4.93487059748703
        Measured from: -5.49199998378754
                   to: 100.804000020027     [s; relative to TRIGTIME]
     T50: 84.7360000014305 +/- 4.65087088671953
        Measured from: 4.96000000834465
                   to: 89.6960000097752     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.224000006914139     
                   to: 1.22400000691414     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.0879999995232     
                   to: 105.384000003338     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.408370   1.443025   0.789049   0.104495
           0.066264   0.068437   0.059438   0.050288 [error]
 Peak      0.049252   0.063070   0.029516   0.010314
           0.008045   0.008378   0.007154   0.005717 [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 4.34e-07 6.04e-07 6.21e-07 1.17e-06 2.03e-06 2.83e-06   erg/cm2
              Error 3.93e-08 3.40e-08 5.86e-08 2.28e-07 1.32e-07 2.82e-07   erg/cm2
Peak flux Power-law 6.08e-01 4.69e-01 2.43e-01 1.81e-01 1.40e+00 1.50e+00   ph/cm2/s
              Error 1.39e-01 7.23e-02 6.12e-02 8.84e-02 2.18e-01 2.33e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.27e-07 6.13e-07 6.21e-07 9.22e-07 2.00e-06 2.58e-06   erg/cm2
              Error 4.48e-08 4.17e-08 6.01e-08 4.66e-07 1.54e-07 5.08e-07   erg/cm2
Peak flux Cutoff-PL 6.09e-01 4.69e-01 2.42e-01 1.78e-01 1.40e+00 1.50e+00   ph/cm2/s
              Error 1.45e-01 7.24e-02 4.66e-02 1.40e-01 2.18e-01 1.94e-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    1.959    0.113    -      -           1.91e-03 1.28e-04   46.110 57
CPL   1.826    0.427      58.8   -5.5      2.26e-03 1.26e-03   45.810 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.950    0.294    -      -           9.57e-03 1.82e-03   55.660 57
CPL   1.945    1.357     406.5    0.0      9.62e-03 0.00e+00   55.660 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: 100.544000 sec.
T50 in the 50-300 keV band: 30.720000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  115.472  -10.088  105.384
T90   106.296   -5.492  100.804
T50    84.736    4.960   89.696
Peak    1.000    0.224    1.224

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
   98.2610    62.7785   0.0115    38.4449  -144.9738         1.2312217     16.894 TRIG_00302506                 
 
Foreground time interval of the image:
-10.088  16.397 (delta_t =  26.485 [sec])
Background time interval of the image:
-179.203 -10.088 (delta_t = 169.115 [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 1.024000

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 1.024000

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 1.024000

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  -10.088 sec. to  105.384 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95930     ( -0.111876   0.114722 )
Norm@50keV  : 1.91061E-03    ( -0.000128967   0.000127281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.11 using 59 PHA bins.
# Reduced chi-squared =         0.8089 for     57 degrees of freedom 
# Null hypothesis probability =   8.485187e-01
 
Photon flux (15-150 keV)    in 115.5 sec: 0.281359 ( -0.016299  0.0163385 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.03141e-06 ( -1.31352e-07  1.32622e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -10.088 sec. to  105.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82636     ( -0.452558   0.401954 )
Epeak [keV] : 58.7929      ( -47.8085 -58.7929 )
Norm@50keV  : 2.25632E-03    ( -0.000850392   0.00167755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.81 using 59 PHA bins.
# Reduced chi-squared =         0.8181 for     56 degrees of freedom 
# Null hypothesis probability =   8.324469e-01
 
Photon flux (15-150 keV)    in 115.5 sec: 0.279082 ( -0.017678  0.017611 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00446e-06 ( -1.56826e-07  1.51998e-07 ) ergs/cm2

Band function

Time interval is from  -10.088 sec. to  105.384 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -2.11760   ( 2.1176   2.1176 )
beta        : -1.95930    ( -0.114721   0.111898 )
Epeak [keV] : 59.5930      ( -59.593 -59.593 )
Norm@50keV   : 0.259678    ( -0.0175284   0.0172993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.11 using 59 PHA bins.
# Reduced chi-squared =         0.8383 for     55 degrees of freedom 
# Null hypothesis probability =   7.978652e-01
 
Photon flux (15-150 keV)    in 115.5 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]    : 10.7463  (  )
R^2/D10^2   : 9.47826E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         121.85 using 59 PHA bins.
# Reduced chi-squared =         2.1377 for     57 degrees of freedom 
# Null hypothesis probability =   1.304441e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.628e-07   2.685e-08
25- 50  7.210e-07   4.389e-08
50-150  4.618e-07   6.872e-08
15-150  1.446e-06   1.051e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 77.2550       (-14.0194      19.3106)
Norm        : 1.30996       (-0.121682     0.139048)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.32 using 59 PHA bins.
# Reduced chi-squared =         0.8653 for     57 degrees of freedom 
# Null hypothesis probability =   7.552374e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.916e-07   3.194e-08
25- 50  6.392e-07   3.748e-08
50-150  8.811e-07   1.342e-07
15-150  1.912e-06   1.502e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.81257        (-1.0821      1.15343)
R1^2/D10^2  : 0.713352        (-0.338856      0.869081)
kT2 [keV]   : 20.8425        (-3.86042      6.22059)
R2^2/D10^2  : 5.75367E-03    (-0.00359324   0.0073218)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.16 using 59 PHA bins.
# Reduced chi-squared =         0.9121 for     55 degrees of freedom 
# Null hypothesis probability =   6.595966e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.076e-07   8.391e-08
25- 50  6.081e-07   1.043e-07
50-150  9.321e-07   2.589e-07
15-150  1.948e-06   3.944e-07

Peak spectrum fit

Power-law model

Time interval is from    0.224 sec. to    1.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94974     ( -0.282846   0.305583 )
Norm@50keV  : 9.56896E-03    ( -0.00185643   0.00178415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.66 using 59 PHA bins.
# Reduced chi-squared =         0.9764 for     57 degrees of freedom 
# Null hypothesis probability =   5.256324e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.40317 ( -0.21765  0.217779 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.80595e-08 ( -1.60597e-08  1.64261e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.224 sec. to    1.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94524     ( -1.35339   1.36086 )
Epeak [keV] : 406.484      (   )
Norm@50keV  : 9.62403E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.66 using 59 PHA bins.
# Reduced chi-squared =         0.9939 for     56 degrees of freedom 
# Null hypothesis probability =   4.877810e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.40309 ( -0.21783  0.21735 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.79775e-08 ( -1.84323e-08  1.63595e-08 ) ergs/cm2

Band function

Time interval is from    0.224 sec. to    1.224 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.46966   ( 1.49089   6.48894 )
beta        : -2.13243    ( 2.12189   0.446251 )
Epeak [keV] : 41.7004      ( -41.8513 -41.8513 )
Norm@50keV   : 1.86324E-02    ( -0.00928776   3.00198e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.50 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     55 degrees of freedom 
# Null hypothesis probability =   4.557242e-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]    : 9.93124  (-1.574  1.91253)
R^2/D10^2   : 0.672458  (-0.33306   0.632311)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.45 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     57 degrees of freedom 
# Null hypothesis probability =   2.322216e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.347e-08   3.697e-09
25- 50  3.318e-08   7.495e-09
50-150  1.697e-08   7.103e-09
15-150  6.363e-08   1.453e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 74.1416       (-29.5296      70.882)
Norm        : 6.73541       (-1.51346     2.05617)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.52 using 59 PHA bins.
# Reduced chi-squared =         0.9916 for     57 degrees of freedom 
# Null hypothesis probability =   4.930492e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.738e-08   3.545e-09
25- 50  2.807e-08   5.490e-09
50-150  3.759e-08   2.001e-08
15-150  8.304e-08   2.199e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.23878        (      )
R1^2/D10^2  : 1.22194        (-0.639102      2.15216)
kT2 [keV]   : 60.1752        (-53.0316      -74.3136)
R2^2/D10^2  : 9.02942E-04    (-0.00048955   0.00499474)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.69 using 59 PHA bins.
#Fit statistic : Chi-Squared =          55.63 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     55 degrees of freedom 
# Reduced chi-squared =          1.011 for     55 degrees of freedom 
# Null hypothesis probability =   3.418451e-01
# Null hypothesis probability =   4.510264e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.760e-08   9.273e-09
25- 50  2.888e-08   1.557e-08
50-150  2.381e-08   1.370e-08
15-150  7.028e-08   3.266e-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: 2.15293     ( -0.188087   0.199831 )
Norm@50keV  : 2.63447E-03    ( -0.000345767   0.000337042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.90 using 59 PHA bins.
# Reduced chi-squared =         0.8579 for     57 degrees of freedom 
# Null hypothesis probability =   7.687751e-01
 
Photon flux (15-150 keV)    in 26.48 sec: 0.425635 ( -0.0412272  0.0412475 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.51882e-07 ( -7.44125e-08  7.57807e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.93794     ( -0.847329   0.38956 )
Epeak [keV] : 11.9659      (   )
Norm@50keV  : 3.51272E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.64 using 59 PHA bins.
# Reduced chi-squared =         0.8685 for     56 degrees of freedom 
# Null hypothesis probability =   7.469992e-01
 
Photon flux (15-150 keV)    in 26.48 sec: 0.421856 ( -0.043079  0.021443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.38107e-07 ( -8.65208e-08  8.59117e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.73043   ( 1.73083   1.73083 )
beta        : -2.32277    ( 2.32276   0.343617 )
Epeak [keV] : 23.5640      ( -23.4506 29.4394 )
Norm@50keV   : 4.79111E-03    ( -0.00199437   1238.62 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.50 using 59 PHA bins.
# Reduced chi-squared =         0.8819 for     55 degrees of freedom 
# Null hypothesis probability =   7.194719e-01
 
Photon flux (15-150 keV)    in 26.48 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.37477e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 6.04e-07
S(50-100 keV) = 6.21e-07

T90 vs. Hardness ratio plot

T90                                   = 106.296000003815 sec.
Hardness ratio (energy fluence ratio) = 1.02815

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.02461
Count Ratio (50-100 keV) / (15-25 keV) = 0.560257

Mask shadow pattern

IMX = -6.500885653266495E-01, IMY = 4.556405148097904E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-179.203410 -10.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6277  22.0177    0.8  48.4  153.8   7.0778  13.6    0.4	Crab                          
 80.5388  27.9672    2.3  48.6  162.6   2.2441   4.9 ------	UNKNOWN                       
171.8028  60.9128    3.0  35.6  -89.1   1.2548   3.8 ------	UNKNOWN

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

Time interval of the image:
-10.088000 16.396600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6026  21.9067    3.9  48.5  153.7  -0.4979  -2.9    6.7	Crab                          
 98.2610  62.7785    0.7  38.4 -145.0   1.2309  16.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
89.396590 962.746900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6412  22.0093    0.4  42.0  160.3  35.5781  28.6    0.5	Crab                          
178.9273  57.1384    3.4  38.1   20.1   2.7101   3.4 ------	UNKNOWN                       
196.8742  61.3466    2.7  41.6    5.3   3.5941   4.3 ------	UNKNOWN                       
245.7727  59.8381    2.8  54.9  -20.9   7.8687   4.1 ------	UNKNOWN                       
 44.8089  27.9060    3.3  48.9 -149.9   4.2650   3.6 ------	UNKNOWN

Plot creation:
Sun May 31 08:26:49 EDT 2015