batgrbproduct analysis for trigger=151905

batgrbproduct Analysis for Trigger=151905

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 20:38:06 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger151905
======================================================================

  Trigger: 00151905      Segment: 000

  BAT Trigger Time: 146617936   [s; MET]
      Trigger Stop: 146618000   [s; MET]
               UTC: 2005-08-24T23:12:16.307660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 12.2370524365621   Dec: 22.592045480018  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.76
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.76

  Flight Position:   [ source = BAT ]
    RA: 12.2370524365621   Dec: 22.592045480018  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 12.2653228188403   Dec: 22.5985296617261  [deg; J2000]  
        { 00h 49m 03.7s , +22d 35' 54.7" }
         +/- 1.96949307934943 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.05836823392072 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5507985557348
 
  Angular difference between Flight and Ground position is 1.613627 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 25.0079999566078 +/- 5.55366545321555
        Measured from: 38.4880000054836
                   to: 63.4959999620914     [s; relative to TRIGTIME]
     T50: 11.9199999570847 +/- 3.72841197195518
        Measured from: 44.1200000047684
                   to: 56.039999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 53.1319999992847     
                   to: 54.1319999992847     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 37.3840000033379     
                   to: 64.5360000133514     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.335506   0.198524   0.067381   0.007278
           0.030180   0.031668   0.028922   0.028556 [error]
 Peak      0.021931   0.016105   0.013275   0.001563
           0.005840   0.006210   0.005452   0.005668 [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 1.10e-07 9.36e-08 5.40e-08 4.64e-08 2.78e-07 3.04e-07   erg/cm2
              Error 1.76e-08 1.75e-08 2.16e-08 3.42e-08 5.15e-08 7.02e-08   erg/cm2
Peak flux Power-law 1.90e-01 1.62e-01 9.45e-02 8.23e-02 4.82e-01 5.28e-01   ph/cm2/s
              Error 8.61e-02 5.02e-02 4.53e-02 8.00e-02 1.49e-01 1.69e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.10e-07 9.69e-08 4.76e-08 1.74e-08 2.66e-07 2.72e-07   erg/cm2
              Error 1.81e-08 2.06e-08 2.92e-08 4.28e-08 5.08e-08 8.09e-08   erg/cm2
Peak flux Cutoff-PL 1.87e-01 1.67e-01 9.36e-02 5.40e-02 4.77e-01 5.01e-01   ph/cm2/s
              Error 9.03e-02 6.57e-02 7.10e-02 6.04e-02 1.53e-01 1.86e-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    2.793    0.365    -      -           9.31e-04 2.75e-04   48.030 57
CPL   1.973    0.729       1.1   10.4      3.30e-03 0.00e+00   47.930 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.778    0.586    -      -           3.53e-03 1.31e-03   54.990 57
CPL   1.523    2.451      75.1    0.0      5.02e-03 0.00e+00   54.960 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   27.152   37.384   64.536
T90    25.008   38.488   63.496
T50    11.920   44.120   56.040
Peak    1.000   53.132   54.132

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
   12.2653    22.5985   0.0167    32.5743   -22.5000         0.7085219     11.551 TRIG_00151905                 
 
Foreground time interval of the image:
 37.384  64.536 (delta_t =  27.152 [sec])
Background time interval of the image:
-196.099  37.384 (delta_t = 233.483 [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 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   37.384 sec. to   64.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.79307     ( -0.338135   0.392067 )
Norm@50keV  : 9.31185E-04    ( -0.000270382   0.000279757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.03 using 59 PHA bins.
# Reduced chi-squared =         0.8426 for     57 degrees of freedom 
# Null hypothesis probability =   7.954379e-01
 
Photon flux (15-150 keV)    in 27.15 sec: 0.221266 ( -0.0303005  0.0303297 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78301e-07 ( -4.97717e-08  5.31649e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   37.384 sec. to   64.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97291     ( -1.4397   0.0191256 )
Epeak [keV] : 1.05754      ( -0.592332 20.1184 )
Norm@50keV  : 3.30127E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8558 for     56 degrees of freedom 
# Null hypothesis probability =   7.700539e-01
 
Photon flux (15-150 keV)    in 27.15 sec: 0.218696 ( -0.030806  0.031163 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65898e-07 ( -5.35678e-08  4.80373e-08 ) ergs/cm2

Band function

Time interval is from   37.384 sec. to   64.536 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.97356   ( -3.08353   0.0413527 )
beta        : -9.37167    ( 9.37167   19.3717 )
Epeak [keV] : 1.05771      ( -1.05734 14.7489 )
Norm@50keV   : 3.25176E-03    ( -0.00100301   0.00118616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8715 for     55 degrees of freedom 
# Null hypothesis probability =   7.392557e-01
 
Photon flux (15-150 keV)    in 27.15 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]    : 5.76175  (-0.963927  1.15006)
R^2/D10^2   : 0.930846  (-0.507259   1.19713)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.77 using 59 PHA bins.
# Reduced chi-squared =         0.9960 for     57 degrees of freedom 
# Null hypothesis probability =   4.836544e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.049e-07   2.693e-08
25- 50  9.568e-08   2.604e-08
50-150  7.399e-09   4.321e-09
15-150  2.080e-07   5.228e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 22.5366       (-6.61772      10.0221)
Norm        : 2.31443       (-0.714984     1.2154)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.81 using 59 PHA bins.
# Reduced chi-squared =         0.8563 for     57 degrees of freedom 
# Null hypothesis probability =   7.714924e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.071e-07   2.191e-08
25- 50  1.024e-07   2.407e-08
50-150  3.722e-08   2.043e-08
15-150  2.467e-07   5.049e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.64150        (-1.42051      1.39709)
R1^2/D10^2  : 5.71022        (-4.31364      72.451)
kT2 [keV]   : 11.3500        (-3.94791      8.70283)
R2^2/D10^2  : 3.27547E-02    (-0.0301573   0.218357)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.24 using 59 PHA bins.
# Reduced chi-squared =         0.8589 for     55 degrees of freedom 
# Null hypothesis probability =   7.622730e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.119e-07   5.886e-08
25- 50  9.486e-08   5.023e-08
50-150  5.292e-08   3.417e-08
15-150  2.596e-07   1.331e-07

Peak spectrum fit

Power-law model

Time interval is from   53.132 sec. to   54.132 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77779     ( -0.559214   0.61254 )
Norm@50keV  : 3.52560E-03    ( -0.00134266   0.00127092 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.99 using 59 PHA bins.
# Reduced chi-squared =         0.9648 for     57 degrees of freedom 
# Null hypothesis probability =   5.506838e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.481700 ( -0.149261  0.149283 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.24869e-08 ( -1.19467e-08  1.2763e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   53.132 sec. to   54.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.52257     ( -4.16391   0.738239 )
Epeak [keV] : 75.1289      (   )
Norm@50keV  : 5.01534E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.96 using 59 PHA bins.
# Reduced chi-squared =         0.9814 for     56 degrees of freedom 
# Null hypothesis probability =   5.143971e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.477181 ( -0.153864  0.152427 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.13311e-08 ( -1.42372e-08  1.37329e-08 ) ergs/cm2

Band function

Time interval is from   53.132 sec. to   54.132 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.94518   ( -4.94518   -4.94518 )
beta        : -2.23206    ( -2.0278   0.810174 )
Epeak [keV] : 26.9559      ( -26.9559 8.85282 )
Norm@50keV   : 305.825    ( -92.403   4.38816e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.57 using 59 PHA bins.
# Reduced chi-squared =         0.9740 for     55 degrees of freedom 
# Null hypothesis probability =   5.294215e-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]    : 9.21804  (-3.05468  5.58062)
R^2/D10^2   : 0.307831  (-0.306951   1.13607)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.13 using 59 PHA bins.
# Reduced chi-squared =          1.002 for     57 degrees of freedom 
# Null hypothesis probability =   4.700948e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.154e-09   3.194e-09
25- 50  1.137e-08   7.200e-09
50-150  4.663e-09   3.381e-09
15-150  2.118e-08   1.317e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 93.7659       (-93.7659      -93.7659)
Norm        : 2.16886       (-0.782303     1.46649)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9643 for     57 degrees of freedom 
# Null hypothesis probability =   5.517848e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.665e-09   3.534e-09
25- 50  9.666e-09   5.915e-09
50-150  1.509e-08   1.218e-08
15-150  3.042e-08   2.135e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.63307        (-2.91048      4.32657)
R1^2/D10^2  : 0.883513        (-0.449048      5.6708)
kT2 [keV]   : 33.0024        (-29.7952      -33.5261)
R2^2/D10^2  : 2.09114E-03    (-0.00212722   0.0785062)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.67 using 59 PHA bins.
# Reduced chi-squared =         0.9758 for     55 degrees of freedom 
# Null hypothesis probability =   5.255668e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.220e-09   3.758e-09
25- 50  9.391e-09   5.625e-09
50-150  1.680e-08   1.107e-08
15-150  3.241e-08   1.615e-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: 2.79307     ( -0.338135   0.392067 )
Norm@50keV  : 9.31185E-04    ( -0.000270382   0.000279757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.03 using 59 PHA bins.
# Reduced chi-squared =         0.8426 for     57 degrees of freedom 
# Null hypothesis probability =   7.954379e-01
 
Photon flux (15-150 keV)    in 27.15 sec: 0.221266 ( -0.0303005  0.0303297 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78301e-07 ( -4.97717e-08  5.31649e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97291     ( -1.4397   0.0191256 )
Epeak [keV] : 1.05754      ( -0.592332 20.1184 )
Norm@50keV  : 3.30127E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8558 for     56 degrees of freedom 
# Null hypothesis probability =   7.700539e-01
 
Photon flux (15-150 keV)    in 27.15 sec: 0.218696 ( -0.030806  0.031163 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65898e-07 ( -5.35678e-08  4.80373e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.97356   ( -3.08353   0.0491956 )
beta        : -9.37167    ( 9.37167   19.3717 )
Epeak [keV] : 1.05771      ( -1.05734 14.7489 )
Norm@50keV   : 3.25176E-03    ( -0.00100301   0.00118616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.93 using 59 PHA bins.
# Reduced chi-squared =         0.8715 for     55 degrees of freedom 
# Null hypothesis probability =   7.392557e-01
 
Photon flux (15-150 keV)    in 27.15 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)  = 9.36e-08
S(50-100 keV) = 5.40e-08

T90 vs. Hardness ratio plot

T90                                   = 25.0079999566078 sec.
Hardness ratio (energy fluence ratio) = 0.576923

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.591715
Count Ratio (50-100 keV) / (15-25 keV) = 0.200834

Mask shadow pattern

IMX = 5.902618446927571E-01, IMY = 2.444946922291937E-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:
-196.099400 37.384000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.9094  10.8690    6.3  47.5  166.0  -0.8821  -1.8    8.0	GRS 1915+105                  
299.5835  35.2126    0.4  36.8 -157.7   8.5636  32.4    0.7	Cyg X-1                       
308.0971  40.9991    1.8  32.9 -143.7   1.5031   6.5    2.9	Cyg X-3                       
326.1286  38.3774    3.6  21.2 -126.0   0.6328   3.2    3.9	Cyg X-2                       
 26.0022  -6.9126    2.7  54.6   13.3   4.7844   4.2 ------	UNKNOWN                       
305.8942  34.5037    2.7  31.6 -156.1   0.9721   4.2 ------	UNKNOWN                       
 11.0191  48.9089    4.1  39.8  -66.3   1.5777   2.8 ------	UNKNOWN

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

Time interval of the image:
37.384000 64.536000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.6865  10.8475    6.4  47.7  166.1  -0.2581  -1.8    8.8	GRS 1915+105                  
299.5523  35.0674   11.6  36.8 -158.0   0.0734   1.0    8.3	Cyg X-1                       
308.1710  40.8672   23.2  32.8 -143.9   0.0327   0.5    5.8	Cyg X-3                       
326.0121  38.4759    0.0  21.4 -126.1  -0.0752  -1.3   11.9	Cyg X-2                       
 12.2653  22.5985    1.0  32.6  -22.5   0.7085  11.6 ------	UNKNOWN                       
281.8315  49.3064    2.6  53.1 -143.2   1.2306   4.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Sun May 31 15:52:31 EDT 2015