batgrbproduct analysis for trigger=174738

batgrbproduct Analysis for Trigger=174738

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 19:17:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger174738
======================================================================

  Trigger: 00174738      Segment: 000

  BAT Trigger Time: 157399635.968   [s; MET]
      Trigger Stop: 157399636.992   [s; MET]
               UTC: 2005-12-27T18:07:16.047360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 125.270470889684   Dec: 31.9290015448698  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.59
     Image Trigger?:     NO
     Rate S/N Ratio:     22.8254244210267  [ if not an image trigger ]
     Image S/N Ratio:    10.59

  Flight Position:   [ source = BAT ]
    RA: 125.270470889684   Dec: 31.9290015448698  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 125.23772898897   Dec: 31.9516727398996  [deg; J2000]  
        { 08h 20m 57.1s , +31d 57' 06.0" }
         +/- 2.14398761662358 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.11185493676384 [arcmin] (formal 1-sigma fit error)
    SNR: 10.2316035713982
 
  Angular difference between Flight and Ground position is 2.151630 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 115.400000035763 +/- 14.9441675577194
        Measured from: 0.127999991178513
                   to: 115.528000026941     [s; relative to TRIGTIME]
     T50: 67.4239999949932 +/- 20.5635553259871
        Measured from: 6.4360000193119
                   to: 73.8600000143051     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.00400000810623169     
                   to: 0.995999991893768     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.84799998998642     
                   to: 122.731999993324     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.325336   0.431133   0.301611   0.084727
           0.049472   0.051529   0.045519   0.040656 [error]
 Peak      0.028849   0.036106   0.046235   0.014614
           0.004844   0.005307   0.004992   0.004255 [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 8.62e-08 1.67e-07 2.50e-07 8.12e-07 7.04e-07 1.31e-06   erg/cm2
              Error 1.94e-08 2.28e-08 4.47e-08 3.17e-07 1.08e-07 3.51e-07   erg/cm2
Peak flux Power-law 2.10e-01 2.85e-01 2.85e-01 5.16e-01 9.47e-01 1.30e+00   ph/cm2/s
              Error 5.61e-02 4.51e-02 3.94e-02 1.53e-01 1.22e-01 1.83e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.60e-08 1.67e-07 2.49e-07 8.00e-07 7.00e-07 1.24e-06   erg/cm2
              Error 1.93e-08 2.45e-08 4.46e-08 4.89e-07 1.10e-07 4.64e-07   erg/cm2
Peak flux Cutoff-PL 2.11e-01 2.86e-01 2.85e-01 5.08e-01 9.47e-01 1.29e+00   ph/cm2/s
              Error 5.75e-02 4.59e-02 4.18e-02 2.24e-01 9.19e-02 2.36e-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    1.415    0.237    -      -           5.91e-04 8.01e-05   51.790 57
CPL   1.421    0.239    9999.4    0.0      5.91e-04 3.64e-04   51.800 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.001    0.231    -      -           8.22e-03 1.04e-03   61.950 57
CPL   0.995    0.495    10000.0    0.0      8.27e-03 1.04e-03   61.960 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: 184.256000 sec.
T50 in the 50-300 keV band: 117.184000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  123.580   -0.848  122.732
T90   115.400    0.128  115.528
T50    67.424    6.436   73.860
Peak    1.000   -0.004    0.996

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
  125.2377    31.9517   0.0188    20.9660   -27.7801         0.4036440     10.232 TRIG_00174738                 
 
Foreground time interval of the image:
 -0.848  18.733 (delta_t =  19.581 [sec])
Background time interval of the image:
-299.968  -0.848 (delta_t = 299.120 [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   -0.848 sec. to  122.732 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.41500     ( -0.237433   0.237065 )
Norm@50keV  : 5.91471E-04    ( -8.04589e-05   7.96927e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.79 using 59 PHA bins.
# Reduced chi-squared =         0.9085 for     57 degrees of freedom 
# Null hypothesis probability =   6.704156e-01
 
Photon flux (15-150 keV)    in 123.6 sec: 7.22793E-02 ( -0.0095375  0.00954623 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.04265e-07 ( -1.0749e-07  1.09432e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.848 sec. to  122.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42068     ( -0.24515   0.232387 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.91126E-04    ( -7.98759e-05   0.000647481 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.80 using 59 PHA bins.
# Reduced chi-squared =         0.9250 for     56 degrees of freedom 
# Null hypothesis probability =   6.345809e-01
 
Photon flux (15-150 keV)    in 123.6 sec: 7.23277E-02 ( -0.0096111  0.0094825 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.00172e-07 ( -1.06095e-07  1.1451e-07 ) ergs/cm2

Band function

Time interval is from   -0.848 sec. to  122.732 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -1.57140    ( -0.316648   0.28738 )
Epeak [keV] : 26.0387      ( -26.0379 5.7128 )
Norm@50keV   : 47.5530    ( -6.19196   228319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.53 using 59 PHA bins.
# Reduced chi-squared =         0.9005 for     55 degrees of freedom 
# Null hypothesis probability =   6.830122e-01
 
Photon flux (15-150 keV)    in 123.6 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]    : 13.0529  (-2.50785  3.65195)
R^2/D10^2   : 1.29236E-02  (-0.0127805   0.0146523)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.88 using 59 PHA bins.
# Reduced chi-squared =          1.279 for     57 degrees of freedom 
# Null hypothesis probability =   7.649562e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.772e-08   1.403e-08
25- 50  1.997e-07   3.961e-08
50-150  2.156e-07   7.033e-08
15-150  4.730e-07   9.839e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 0.295535       (-0.0387758     0.0387745)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.32 using 59 PHA bins.
# Reduced chi-squared =         0.9354 for     57 degrees of freedom 
# Null hypothesis probability =   6.139881e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.096e-08   5.169e-08
25- 50  1.750e-07   9.684e-08
50-150  3.838e-07   2.128e-07
15-150  6.497e-07   3.640e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.83605        (-1.67382      1.99424)
R1^2/D10^2  : 6.29621E-02        (-0.0346814      0.0824103)
kT2 [keV]   : 52.6747        (-23.5557      -52.6746)
R2^2/D10^2  : 1.33763E-04    (-0.000123438   0.000563939)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.36 using 59 PHA bins.
# Reduced chi-squared =         0.8429 for     55 degrees of freedom 
# Null hypothesis probability =   7.900917e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.986e-08   4.249e-08
25- 50  1.787e-07   7.700e-08
50-150  4.865e-07   2.617e-07
15-150  7.551e-07   3.513e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.004 sec. to    0.996 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00093     ( -0.235533   0.227112 )
Norm@50keV  : 8.22481E-03    ( -0.00104457   0.00104058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.95 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     57 degrees of freedom 
# Null hypothesis probability =   3.041125e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.946976 ( -0.121703  0.121915 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.89994e-08 ( -1.18521e-08  1.17591e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.004 sec. to    0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.995361     ( -0.707809   0.28299 )
Epeak [keV] : 1.00000E+04      (   )
Norm@50keV  : 8.27395E-03    ( -0.00103814   0.00103547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.96 using 59 PHA bins.
# Reduced chi-squared =          1.106 for     56 degrees of freedom 
# Null hypothesis probability =   2.720997e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.947472 ( -0.062173  0.121618 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.87988e-08 ( -1.23225e-08  1.24742e-08 ) ergs/cm2

Band function

Time interval is from   -0.004 sec. to    0.996 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.86690   ( -4.8669   -4.8669 )
beta        : -1.03334    ( -0.262538   0.249347 )
Epeak [keV] : 24.8052      ( -24.8052 9.41356 )
Norm@50keV   : 464.835    ( -58.1721   1.79852e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.85 using 59 PHA bins.
# Reduced chi-squared =          1.125 for     55 degrees of freedom 
# Null hypothesis probability =   2.447723e-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]    : 22.2836  (-3.8676  5.17916)
R^2/D10^2   : 3.19383E-02  (-0.0150977   0.0263793)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.24 using 59 PHA bins.
# Reduced chi-squared =          1.337 for     57 degrees of freedom 
# Null hypothesis probability =   4.529342e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.918e-09   8.330e-10
25- 50  1.555e-08   3.721e-09
50-150  5.768e-08   1.443e-08
15-150  7.615e-08   1.560e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 3.82819       (-0.503328     0.503311)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.01 using 59 PHA bins.
# Reduced chi-squared =          1.369 for     57 degrees of freedom 
# Null hypothesis probability =   3.374078e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.530e-09   5.325e-09
25- 50  1.833e-08   1.009e-08
50-150  4.021e-08   2.256e-08
15-150  6.807e-08   3.770e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.05343        (-4.06565      6.96061)
R1^2/D10^2  : 0.464756        (-0.365624      1.05362)
kT2 [keV]   : 38.9196        (-14.7874      -39.5469)
R2^2/D10^2  : 5.18538E-03    (-0.00433272   0.0236592)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.92 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     55 degrees of freedom 
# Null hypothesis probability =   2.162354e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.511e-09   3.725e-09
25- 50  1.669e-08   8.645e-09
50-150  6.719e-08   3.591e-08
15-150  9.039e-08   4.735e-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: 1.40608     ( -0.263355   0.26586 )
Norm@50keV  : 1.35271E-03    ( -0.000213011   0.0002112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.45 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     57 degrees of freedom 
# Null hypothesis probability =   8.155543e-02
 
Photon flux (15-150 keV)    in 19.58 sec: 0.164964 ( -0.0253115  0.0253356 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55611e-07 ( -4.47797e-08  4.56326e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.910274     ( -1.20653   0.546048 )
Epeak [keV] : 109.276      ( -48.5817 -109.276 )
Norm@50keV  : 2.41988E-03    ( -0.00124565   0.00700425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.72 using 59 PHA bins.
# Reduced chi-squared =          1.281 for     56 degrees of freedom 
# Null hypothesis probability =   7.679350e-02
 
Photon flux (15-150 keV)    in 19.58 sec: 0.161651 ( -0.026251  0.026166 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.45784e-07 ( -4.85917e-08  4.96294e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.67191   ( -6.15738   -4.67191 )
beta        : -1.50775    ( -0.335093   0.302459 )
Epeak [keV] : 25.4364      ( -25.4364 8.38094 )
Norm@50keV   : 69.6859    ( -10.5553   650688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.71 using 59 PHA bins.
# Reduced chi-squared =          1.304 for     55 degrees of freedom 
# Null hypothesis probability =   6.449345e-02
 
Photon flux (15-150 keV)    in 19.58 sec: 0.162806 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49825e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 1.67e-07
S(50-100 keV) = 2.50e-07

T90 vs. Hardness ratio plot

T90                                   = 115.400000035763 sec.
Hardness ratio (energy fluence ratio) = 1.49701

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.32519
Count Ratio (50-100 keV) / (15-25 keV) = 0.927075

Mask shadow pattern

IMX = 3.390189792628797E-01, IMY = 1.785939202094247E-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:
-299.968000 -0.848000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6319  22.0145    0.2  18.4  124.2  13.0823  62.6    0.1	Crab                          
 90.4635  -5.1203    2.3  39.2   82.1   4.1617   4.9 ------	UNKNOWN                       
139.2812  33.3190    2.5  32.4  -35.2   1.1813   4.6 ------	UNKNOWN                       
155.8220  22.3487    2.7  49.7  -26.2   2.0541   4.3 ------	UNKNOWN

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

Time interval of the image:
-0.848000 18.732600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7894  22.0936    4.7  18.2  124.1   0.1088   2.4    9.9	Crab                          
 34.3947  40.6634    2.4  52.2 -174.9   0.4531   4.7 ------	UNKNOWN                       
125.2377  31.9517    1.1  21.0  -27.8   0.4038  10.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
80.732600 302.106100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6322  22.0199    0.7  38.1   97.2   9.1635  16.2    0.3	Crab                          
177.9342  43.0761    3.0  42.5 -109.1   2.6048   3.9 ------	UNKNOWN

Plot creation:
Sun May 31 14:50:52 EDT 2015