batgrbproduct analysis for trigger=181126

batgrbproduct Analysis for Trigger=181126

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 18:30:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger181126
======================================================================

  Trigger: 00181126      Segment: 000

  BAT Trigger Time: 161343552   [s; MET]
      Trigger Stop: 161343680   [s; MET]
               UTC: 2006-02-11T09:39:10.990840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 58.4020233754094   Dec: 21.4858393231787  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.55
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.55

  Flight Position:   [ source = BAT ]
    RA: 58.4020233754094   Dec: 21.4858393231787  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 58.3854042843909   Dec: 21.495370349101  [deg; J2000]  
        { 03h 53m 32.5s , +21d 29' 43.3" }
         +/- 1.48946512039503 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.503852818142319 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2159972045707
 
  Angular difference between Flight and Ground position is 1.089898 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 126.460000008345 +/- 9.55531266524824
        Measured from: 54.0920000076294
                   to: 180.552000015974     [s; relative to TRIGTIME]
     T50: 80.0480000078678 +/- 6.29694434260896
        Measured from: 77.0640000104904
                   to: 157.112000018358     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 150.331999987364     
                   to: 151.331999987364     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 47.83599999547     
                   to: 194.208000004292     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.045637   1.225824   0.760373   0.028479
           0.059282   0.061899   0.055932   0.053456 [error]
 Peak      0.019205   0.017819   0.012028   0.002755
           0.004996   0.005213   0.004723   0.004407 [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 2.99e-07 4.73e-07 5.63e-07 1.30e-06 1.71e-06 2.64e-06   erg/cm2
              Error 2.81e-08 2.85e-08 5.28e-08 2.51e-07 1.23e-07 3.00e-07   erg/cm2
Peak flux Power-law 1.78e-01 1.44e-01 7.83e-02 6.25e-02 4.28e-01 4.63e-01   ph/cm2/s
              Error 6.95e-02 3.95e-02 3.90e-02 6.19e-02 1.16e-01 1.33e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.70e-07 5.14e-07 5.58e-07 3.94e-07 1.58e-06 1.74e-06   erg/cm2
              Error 3.29e-08 3.73e-08 5.97e-08 2.65e-07 1.40e-07 3.01e-07   erg/cm2
Peak flux Cutoff-PL 1.80e-01 1.43e-01 7.71e-02 5.96e-02 4.28e-01 4.61e-01   ph/cm2/s
              Error 7.06e-02 4.40e-02 -------- 7.08e-02 1.16e-01 1.31e-01   ph/cm2/s
 
Fluence        Band 2.69e-07 5.11e-07 5.59e-07 4.22e-07 1.58e-06 1.75e-06   erg/cm2
              Error 3.01e-08 3.65e-08 5.58e-08 -------- 1.37e-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    1.748    0.111    -      -           1.27e-03 8.67e-05   63.500 57
CPL   0.942    0.496      58.7   15.7      3.49e-03 2.36e-03   54.070 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.876    0.588    -      -           3.01e-03 1.13e-03   41.470 57
CPL   2.120    1.162      49.6    0.0      2.24e-03 0.00e+00   41.410 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: 27.584000 sec.
T50 in the 50-300 keV band: 15.168000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  146.372   47.836  194.208
T90   126.460   54.092  180.552
T50    80.048   77.064  157.112
Peak    1.000  150.332  151.332

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
   58.3854    21.4954   0.0111     5.5813   178.1746         1.6692151     17.216 TRIG_00181126                 
 
Foreground time interval of the image:
 47.836 137.301 (delta_t =  89.465 [sec])
Background time interval of the image:
-299.000  47.836 (delta_t = 346.836 [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 128.000000

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 128.000000

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 128.000000

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   47.836 sec. to  194.208 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.74829     ( -0.109978   0.112024 )
Norm@50keV  : 1.26840E-03    ( -8.70475e-05   8.62529e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.50 using 59 PHA bins.
# Reduced chi-squared =          1.114 for     57 degrees of freedom 
# Null hypothesis probability =   2.582972e-01
 
Photon flux (15-150 keV)    in 146.4 sec: 0.171401 ( -0.0104044  0.0104099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.71364e-06 ( -1.21853e-07  1.23354e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   47.836 sec. to  194.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.941694     ( -0.525705   0.467286 )
Epeak [keV] : 58.7059      ( -9.19949 22.229 )
Norm@50keV  : 3.48626E-03    ( -0.00151895   0.00319142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.07 using 59 PHA bins.
# Reduced chi-squared =         0.9656 for     56 degrees of freedom 
# Null hypothesis probability =   5.480847e-01
 
Photon flux (15-150 keV)    in 146.4 sec: 0.164378 ( -0.011072  0.011081 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57664e-06 ( -1.37303e-07  1.42081e-07 ) ergs/cm2

Band function

Time interval is from   47.836 sec. to  194.208 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.941629   ( -0.311352   0.744831 )
beta        : -10.00000    ( 10   2.31605e-10 )
Epeak [keV] : 58.6942      ( -9.20029 22.2261 )
Norm@50keV   : 3.48635E-03    ( -0.00121727   0.000208344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.07 using 59 PHA bins.
# Reduced chi-squared =         0.9832 for     55 degrees of freedom 
# Null hypothesis probability =   5.099681e-01
 
Photon flux (15-150 keV)    in 146.4 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.58176e-06 ( -1.58074e-06  -1.43816e-07 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.0976  (-0.869502  0.942513)
R^2/D10^2   : 3.97856E-02  (-0.00958747   0.0125759)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          93.18 using 59 PHA bins.
# Reduced chi-squared =          1.635 for     57 degrees of freedom 
# Null hypothesis probability =   1.767551e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.804e-07   1.925e-08
25- 50  5.732e-07   4.070e-08
50-150  5.071e-07   7.042e-08
15-150  1.261e-06   9.670e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 108.062       (-23.968      33.6231)
Norm        : 0.741999       (-0.0580903     0.0695572)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.58 using 59 PHA bins.
# Reduced chi-squared =         0.9750 for     57 degrees of freedom 
# Null hypothesis probability =   5.286620e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.838e-07   2.804e-08
25- 50  4.982e-07   4.055e-08
50-150  8.425e-07   2.686e-07
15-150  1.624e-06   2.916e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.55504        (-1.36077      1.6219)
R1^2/D10^2  : 0.382625        (-0.218785      0.742562)
kT2 [keV]   : 17.7902        (-2.67971      4.31952)
R2^2/D10^2  : 7.70594E-03    (-0.00460982   0.00595397)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.48 using 59 PHA bins.
# Reduced chi-squared =         0.9724 for     55 degrees of freedom 
# Null hypothesis probability =   5.327466e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.756e-07   1.020e-07
25- 50  5.000e-07   1.400e-07
50-150  7.646e-07   2.165e-07
15-150  1.540e-06   3.832e-07

Peak spectrum fit

Power-law model

Time interval is from  150.332 sec. to  151.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.87576     ( -0.527382   0.648504 )
Norm@50keV  : 3.01374E-03    ( -0.00118626   0.00106932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.47 using 59 PHA bins.
# Reduced chi-squared =         0.7275 for     57 degrees of freedom 
# Null hypothesis probability =   9.392718e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.428122 ( -0.116179  0.116238 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.77052e-08 ( -9.87562e-09  1.05584e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  150.332 sec. to  151.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.11961     ( -2.28085   0.042504 )
Epeak [keV] : 49.6335      (   )
Norm@50keV  : 2.23821E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.41 using 59 PHA bins.
# Reduced chi-squared =         0.7395 for     56 degrees of freedom 
# Null hypothesis probability =   9.273241e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.427560 ( -0.115745  0.11579 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.75516e-08 ( -9.8888e-09  1.05771e-08 ) ergs/cm2

Band function

Time interval is from  150.332 sec. to  151.332 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -5.81685   ( 5.81685   5.81685 )
beta        : -1.87577    ( -0.648498   0.527392 )
Epeak [keV] : 60.7358      ( -60.7358 -60.7358 )
Norm@50keV   : 0.409609    ( -0.161228   0.145337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.47 using 59 PHA bins.
# Reduced chi-squared =         0.7540 for     55 degrees of freedom 
# Null hypothesis probability =   9.113727e-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]    : 12.6725  (-3.91615  5.24495)
R^2/D10^2   : 8.40065E-02  (-0.0839642   0.22903)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.32 using 59 PHA bins.
# Reduced chi-squared =         0.8126 for     57 degrees of freedom 
# Null hypothesis probability =   8.431145e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.861e-09   1.771e-09
25- 50  9.583e-09   5.800e-09
50-150  9.582e-09   6.510e-09
15-150  2.203e-08   1.330e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 93.8229       (-58.2668      -93.8229)
Norm        : 1.91713       (-0.603058     1.0655)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.95 using 59 PHA bins.
# Reduced chi-squared =         0.7360 for     57 degrees of freedom 
# Null hypothesis probability =   9.323024e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.007e-09   3.126e-09
25- 50  8.545e-09   5.220e-09
50-150  1.334e-08   1.077e-08
15-150  2.690e-08   1.834e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.80374        (-1.21801      1.74842)
R1^2/D10^2  : 34.0184        (-31.0806      1772.92)
kT2 [keV]   : 16.7566        (-5.15756      9.8109)
R2^2/D10^2  : 2.68187E-02    (-0.0214067   0.0430673)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.12 using 59 PHA bins.
# Reduced chi-squared =         0.6930 for     55 degrees of freedom 
# Null hypothesis probability =   9.596749e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.665e-09   3.185e-09
25- 50  7.205e-09   4.163e-09
50-150  1.343e-08   9.095e-09
15-150  2.631e-08   1.484e-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: 1.48944     ( -0.141713   0.14319 )
Norm@50keV  : 1.20622E-03    ( -0.000105014   0.000104278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.14 using 59 PHA bins.
# Reduced chi-squared =         0.8797 for     57 degrees of freedom 
# Null hypothesis probability =   7.279985e-01
 
Photon flux (15-150 keV)    in 89.46 sec: 0.150160 ( -0.012359  0.0123639 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02547e-06 ( -9.89794e-08  1.00379e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.748138     ( -0.666197   0.571924 )
Epeak [keV] : 78.9680      ( -18.9909 100.611 )
Norm@50keV  : 2.98651E-03    ( -0.00147581   0.00367244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.02 using 59 PHA bins.
# Reduced chi-squared =         0.8040 for     56 degrees of freedom 
# Null hypothesis probability =   8.530821e-01
 
Photon flux (15-150 keV)    in 89.46 sec: 0.145188 ( -0.012914  0.012909 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.51774e-07 ( -1.11486e-07  1.14285e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.748110   ( -0.480328   0.765024 )
beta        : -10.0000    ( 10   20 )
Epeak [keV] : 78.9543      ( -18.9943 100.545 )
Norm@50keV   : 2.98652E-03    ( -0.00147549   0.00367483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.02 using 59 PHA bins.
# Reduced chi-squared =         0.8186 for     55 degrees of freedom 
# Null hypothesis probability =   8.292033e-01
 
Photon flux (15-150 keV)    in 89.46 sec: 0.146775 ( 6.85323  -0.014906 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.73772e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 4.73e-07
S(50-100 keV) = 5.63e-07

T90 vs. Hardness ratio plot

T90                                   = 126.460000008345 sec.
Hardness ratio (energy fluence ratio) = 1.19027

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.17232
Count Ratio (50-100 keV) / (15-25 keV) = 0.727186

Mask shadow pattern

IMX = -9.767117629792654E-02, IMY = -3.112763639287293E-03

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 128.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 128.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 128.000000

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:
-299.000000 47.836000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6289  22.0144    0.2  24.0  100.9  15.3298  46.6    0.2	Crab                          
 27.7907  57.3737    2.5  37.0  -22.1   1.5404   4.7 ------	UNKNOWN                       
 48.2512 -31.3134    3.7  59.1 -166.1   4.9444   3.1 ------	UNKNOWN                       
 15.4311  15.4231    3.4  40.9  -93.2   4.7262   3.4 ------	UNKNOWN

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

Time interval of the image:
47.836000 137.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4700  22.0105   58.8  23.9  101.0  -0.0275  -0.2    9.1	Crab                          
 58.3854  21.4954    0.7   5.6  178.2   1.6692  17.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
165.300600 303.076800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6407  22.0138    0.4  23.4   95.9   5.7310  32.2    0.4	Crab                          
 64.3616  52.2791    2.2  31.1   18.9   0.8427   5.1 ------	UNKNOWN                       
 24.7429  69.7303    2.9  52.3   -2.2   1.4884   4.0 ------	UNKNOWN

Plot creation:
Sun May 31 14:14:16 EDT 2015