batgrbproduct analysis for trigger=306793

batgrbproduct Analysis for Trigger=306793

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 03:34:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger306793
======================================================================

  Trigger: 00306793      Segment: 000

  BAT Trigger Time: 227639112   [s; MET]
      Trigger Stop: 227639176   [s; MET]
               UTC: 2008-03-19T17:05:09.345180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 99.4803719736166   Dec: 23.9335194811168  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.22
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.22

  Flight Position:   [ source = BAT ]
    RA: 99.4803719736166   Dec: 23.9335194811168  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 99.4792769236431   Dec: 23.9837185697156  [deg; J2000]  
        { 06h 37m 55.0s , +23d 59' 01.4" }
         +/- 2.54261148763677 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.15092045085236 [arcmin] (formal 1-sigma fit error)
    SNR: 8.01949358880981
 
  Angular difference between Flight and Ground position is 3.012544 arcmin
 
  Partial Coding Fraction: 0.59375    [ including projection effects ]

  Duration
     T90: 26.9400000274181 +/- 4.47841399106537
        Measured from: 7.23199999332428
                   to: 34.1720000207424     [s; relative to TRIGTIME]
     T50: 15.6879999935627 +/- 5.20474861129683
        Measured from: 13.080000013113
                   to: 28.7680000066757     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 33.5699999928474     
                   to: 34.5699999928474     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 4.9839999973774     
                   to: 34.4760000109673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.178881   0.258750   0.084364   0.049669
           0.034188   0.036473   0.034847   0.037458 [error]
 Peak      0.019970   0.017432   0.007569   0.004194
           0.006370   0.006802   0.006449   0.007061 [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 5.89e-08 9.07e-08 1.05e-07 2.32e-07 3.23e-07 4.87e-07   erg/cm2
              Error 1.56e-08 1.73e-08 3.27e-08 1.46e-07 7.70e-08 1.81e-07   erg/cm2
Peak flux Power-law 1.56e-01 1.38e-01 8.36e-02 7.67e-02 4.10e-01 4.54e-01   ph/cm2/s
              Error 9.89e-02 5.72e-02 5.49e-02 1.18e-01 1.70e-01 1.98e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.32e-08 1.17e-07 6.09e-08 3.86e-09 2.35e-07 2.35e-07   erg/cm2
              Error 1.81e-08 3.04e-08 5.24e-08 1.15e-07 8.67e-08 1.55e-07   erg/cm2
Peak flux Cutoff-PL 1.60e-01 1.38e-01 8.13e-02 7.16e-02 4.10e-01 4.52e-01   ph/cm2/s
              Error 1.00e-01 6.44e-02 6.99e-02 1.15e-01 1.70e-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    1.791    0.341    -      -           1.19e-03 2.75e-04   57.720 57
CPL  -0.726    3.625      38.6 4960.4      4.57e-02 0.00e+00   54.970 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.721    0.901    -      -           3.06e-03 1.56e-03   41.230 57
CPL   1.735    0.000    9854.7    0.0      3.00e-03 0.00e+00   41.230 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   29.492    4.984   34.476
T90    26.940    7.232   34.172
T50    15.688   13.080   28.768
Peak    1.000   33.570   34.570

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
   99.4793    23.9837   0.0241    33.9137  -141.3578         0.6011024      8.019 TRIG_00306793                 
 
Foreground time interval of the image:
  4.984  34.476 (delta_t =  29.492 [sec])
Background time interval of the image:
-239.000   4.984 (delta_t = 243.984 [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    4.984 sec. to   34.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79148     ( -0.330495   0.351569 )
Norm@50keV  : 1.18936E-03    ( -0.000279143   0.000271477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.72 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.485138e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.163353 ( -0.031097  0.0310975 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23004e-07 ( -7.51137e-08  7.89037e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.984 sec. to   34.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.726477     ( -4.92063   2.32864 )
Epeak [keV] : 38.5595      ( -7.92782 9912.93 )
Norm@50keV  : 4.57418E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9817 for     56 degrees of freedom 
# Null hypothesis probability =   5.137446e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.148769 ( -0.031221  0.033658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34669e-07 ( -6.02094e-08  1.13095e-07 ) ergs/cm2

Band function

Time interval is from    4.984 sec. to   34.476 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.87408   ( -5.79645   -4.87408 )
beta        : -2.48446    ( -1.77062   0.624208 )
Epeak [keV] : 29.7991      ( -7.22732 5.82902 )
Norm@50keV   : 51.2338    ( -9.44123   289.849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.71 using 59 PHA bins.
# Reduced chi-squared =         0.9584 for     55 degrees of freedom 
# Null hypothesis probability =   5.625341e-01
 
Photon flux (15-150 keV)    in 29.49 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]    : 9.49589  (-1.60062  2.04995)
R^2/D10^2   : 9.77456E-02  (-0.0516933   0.0997301)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.11 using 59 PHA bins.
# Reduced chi-squared =         0.9669 for     57 degrees of freedom 
# Null hypothesis probability =   5.461466e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.190e-08   1.743e-08
25- 50  1.197e-07   3.987e-08
50-150  5.368e-08   2.677e-08
15-150  2.253e-07   6.101e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 81.3403       (-37.8465      -81.3403)
Norm        : 0.769577       (-0.188599     0.264696)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.47 using 59 PHA bins.
# Reduced chi-squared =         0.9907 for     57 degrees of freedom 
# Null hypothesis probability =   4.949733e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.895e-08   1.995e-08
25- 50  9.743e-08   3.319e-08
50-150  1.391e-07   1.049e-07
15-150  2.955e-07   1.450e-07

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.63592        (-1.90409      1.77099)
R1^2/D10^2  : 0.130628        (-0.0579352      0.075647)
kT2 [keV]   : 200.000        (      )
R2^2/D10^2  : 1.50569E-05    (-1.16353e-05   0.000127473)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.43 using 59 PHA bins.
#Fit statistic : Chi-Squared =          51.28 using 59 PHA bins.
# Reduced chi-squared =         0.9351 for     55 degrees of freedom 
# Reduced chi-squared =         0.9324 for     55 degrees of freedom 
# Null hypothesis probability =   6.119012e-01
# Null hypothesis probability =   6.174768e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.551e-08   2.854e-08
25- 50  1.131e-07   5.777e-08
50-150  1.549e-07   5.838e-08
15-150  3.234e-07   1.357e-07

Peak spectrum fit

Power-law model

Time interval is from   33.570 sec. to   34.570 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72093     ( -0.829941   0.972747 )
Norm@50keV  : 3.06438E-03    ( -0.00164877   0.00147359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.23 using 59 PHA bins.
# Reduced chi-squared =         0.7233 for     57 degrees of freedom 
# Null hypothesis probability =   9.425664e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.410005 ( -0.16981  0.169816 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.83283e-08 ( -1.42083e-08  1.56459e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   33.570 sec. to   34.570 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73489     (     )
Epeak [keV] : 9854.71      (   )
Norm@50keV  : 3.00491E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.23 using 59 PHA bins.
# Reduced chi-squared =         0.7363 for     56 degrees of freedom 
# Null hypothesis probability =   9.301044e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.410069 ( -0.17002  0.169581 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.8353e-08 ( -1.48463e-08  1.53437e-08 ) ergs/cm2

Band function

Time interval is from   33.570 sec. to   34.570 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.98687   ( -4.98687   -4.98687 )
beta        : -1.80089    ( -1.42394   0.878852 )
Epeak [keV] : 20.9480      ( -20.948 68.0762 )
Norm@50keV   : 1213.68    ( -500.05   6.37811e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.07 using 59 PHA bins.
# Reduced chi-squared =         0.7467 for     55 degrees of freedom 
# Null hypothesis probability =   9.185743e-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]    : 11.0940  (-5.44077  11.227)
R^2/D10^2   : 0.127431  (-0.126343   1.44701)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.41 using 59 PHA bins.
# Reduced chi-squared =         0.7616 for     57 degrees of freedom 
# Null hypothesis probability =   9.077433e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.282e-09   2.220e-09
25- 50  9.383e-09   6.105e-09
50-150  6.566e-09   5.205e-09
15-150  1.923e-08   1.281e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 135.119       (-108.175      -133.168)
Norm        : 1.70052       (-0.741626     1.90438)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.45 using 59 PHA bins.
# Reduced chi-squared =         0.7272 for     57 degrees of freedom 
# Null hypothesis probability =   9.395608e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.402e-09   2.776e-09
25- 50  8.031e-09   5.060e-09
50-150  1.515e-08   1.048e-08
15-150  2.759e-08   1.805e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.39728        (-4.40967      10.4947)
R1^2/D10^2  : 3.17000        (-3.11925      -3.11925)
kT2 [keV]   : 21.3746        (-21.6501      -21.6501)
R2^2/D10^2  : 1.00363E-02    (-0.00956237   0.351726)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.35 using 59 PHA bins.
# Reduced chi-squared =         0.7518 for     55 degrees of freedom 
# Null hypothesis probability =   9.135755e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.338e-09   3.469e-09
25- 50  6.569e-09   3.543e-09
50-150  1.528e-08   1.100e-08
15-150  2.718e-08   1.546e-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: 1.79148     ( -0.330495   0.351569 )
Norm@50keV  : 1.18936E-03    ( -0.000279143   0.000271477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.72 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.485138e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.163353 ( -0.031097  0.0310975 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23004e-07 ( -7.51137e-08  7.89037e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.726477     ( -4.92063   2.32864 )
Epeak [keV] : 38.5595      ( -7.92782 9912.93 )
Norm@50keV  : 4.57418E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9817 for     56 degrees of freedom 
# Null hypothesis probability =   5.137446e-01
 
Photon flux (15-150 keV)    in 29.49 sec: 0.148769 ( -0.031221  0.033658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34669e-07 ( -6.02094e-08  1.13095e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.87408   ( -5.79645   -4.87408 )
beta        : -2.48446    ( -1.77062   0.624208 )
Epeak [keV] : 29.7991      ( -7.22732 5.82902 )
Norm@50keV   : 51.2338    ( -9.44123   289.849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.71 using 59 PHA bins.
# Reduced chi-squared =         0.9584 for     55 degrees of freedom 
# Null hypothesis probability =   5.625341e-01
 
Photon flux (15-150 keV)    in 29.49 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)  = 9.07e-08
S(50-100 keV) = 1.05e-07

T90 vs. Hardness ratio plot

T90                                   = 26.9400000274181 sec.
Hardness ratio (energy fluence ratio) = 1.15766

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.44649
Count Ratio (50-100 keV) / (15-25 keV) = 0.471621

Mask shadow pattern

IMX = -5.251212045229291E-01, IMY = 4.198328824921220E-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:
-239.000000 4.984000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6291  22.0048    0.9  47.7 -133.5   9.4135  12.4    0.6	Crab                          
149.8294  68.1595    2.4  33.8  -33.5   1.1359   4.8 ------	UNKNOWN

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

Time interval of the image:
4.984000 34.476000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6303  21.9694    5.6  47.8 -133.6   0.4368   2.1    2.7	Crab                          
 99.4793  23.9838    1.4  33.9 -141.4   0.6011   8.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
131.300610 963.062800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6311  22.0156    0.2  14.7  -98.0  35.9421  68.2    0.1	Crab                          
154.1096  57.3983    4.1  51.2   30.7   7.6600   2.8 ------	UNKNOWN                       
143.2827  61.8194    2.4  48.0   22.4   6.5973   4.8 ------	UNKNOWN                       
104.4671  -7.1867    2.1  31.5  166.9   3.8511   5.5 ------	UNKNOWN                       
129.6443  78.9924    2.9  56.7    2.9  11.9078   4.0 ------	UNKNOWN                       
100.8891  71.1204    3.2  47.2   -3.0   3.9870   3.7 ------	UNKNOWN                       
 81.6509 -32.5673    4.1  59.0 -166.1  10.0357   2.8 ------	UNKNOWN                       
 43.5969  52.2884    4.0  50.6  -44.6   8.8059   2.9 ------	UNKNOWN                       
 45.9147  47.8742    3.0  48.3  -49.9  10.7564   3.8 ------	UNKNOWN

Plot creation:
Sun May 31 08:01:56 EDT 2015