batgrbproduct analysis for trigger=676423

batgrbproduct Analysis for Trigger=676423

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): Sun Mar 20 23:23:31 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger676423
======================================================================

  Trigger: 00676423      Segment: 000

  BAT Trigger Time: 478294344   [s; MET]
      Trigger Stop: 478294416   [s; MET]
               UTC: 2016-02-27T19:32:08.096040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 194.788571324558   Dec: 78.6392014846058  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.02
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.02

  Flight Position:   [ source = BAT ]
    RA: 194.788571324558   Dec: 78.6392014846058  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 195.059174407585   Dec: 78.6685120054544  [deg; J2000]  
        { 13h 00m 14.2s , +78d 40' 06.6" }
         +/- 2.97376821924807 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.34383552293449 [arcmin] (formal 1-sigma fit error)
    SNR: 6.41158430887127
 
  Angular difference between Flight and Ground position is 3.646356 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 316.347999989986 +/- 75.7592504173685
        Measured from: -92.8080000281334
                   to: 223.539999961853     [s; relative to TRIGTIME]
     T50: 175.111999988556 +/- 14.1224678947954
        Measured from: 23.9279999732971
                   to: 199.039999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 198.839999973774     
                   to: 199.839999973774     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -99.3880000114441     
                   to: 236.963999986649     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.410156   2.282590   1.494348   0.364893
           0.108258   0.112514   0.096859   0.080193 [error]
 Peak      0.011925   0.028957   0.033011   0.010485
           0.004695   0.005094   0.004449   0.003599 [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 4.74e-07 8.44e-07 1.16e-06 3.27e-06 3.34e-06 5.75e-06   erg/cm2
              Error 4.72e-08 5.24e-08 9.25e-08 5.51e-07 2.24e-07 6.27e-07   erg/cm2
Peak flux Power-law 1.39e-01 1.86e-01 1.83e-01 3.24e-01 6.15e-01 8.33e-01   ph/cm2/s
              Error 4.61e-02 3.92e-02 3.30e-02 1.19e-01 1.08e-01 1.51e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.20e-07 9.18e-07 1.19e-06 1.10e-06 3.12e-06 3.63e-06   erg/cm2
              Error 5.59e-08 6.76e-08 1.04e-07 6.55e-07 2.53e-07 6.92e-07   erg/cm2
Peak flux Cutoff-PL 6.10e-02 2.05e-01 2.31e-01 5.29e-02 5.43e-01 5.50e-01   ph/cm2/s
              Error 5.25e-02 5.32e-02 4.59e-02 6.32e-02 1.18e-01 1.31e-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    1.549    0.103    -      -           1.05e-03 6.50e-05   59.220 57
CPL   0.753    0.482      75.5   25.6      2.72e-03 1.67e-03   49.650 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.023    0.272    -      -           5.33e-03 9.19e-04   55.670 57
CPL  -1.991    2.683      73.7   23.5      1.15e-01 1.45e+00   47.030 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: 251.264000 sec.
T50 in the 50-300 keV band: 143.104000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  336.352  -99.388  236.964
T90   316.348  -92.808  223.540
T50   175.112   23.928  199.040
Peak    1.000  198.840  199.840

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
  195.0592    78.6685   0.0299    27.1342   -82.6857         1.6833534      6.412 TRIG_00676423                 
 
Foreground time interval of the image:
-99.388  93.301 (delta_t = 192.689 [sec])
Background time interval of the image:
-239.000 -99.388 (delta_t = 139.612 [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  -99.388 sec. to  236.964 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.54878     ( -0.102331   0.103006 )
Norm@50keV  : 1.05383E-03    ( -6.51611e-05   6.49376e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.22 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.944151e-01
 
Photon flux (15-150 keV)    in 336.4 sec: 0.133366 ( -0.008133  0.008142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.33838e-06 ( -2.23039e-07  2.247e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -99.388 sec. to  236.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.753150     ( -0.509432   0.455087 )
Epeak [keV] : 75.5337      ( -13.4052 37.8574 )
Norm@50keV  : 2.72069E-03    ( -0.00112147   0.00222029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.65 using 59 PHA bins.
# Reduced chi-squared =         0.8866 for     56 degrees of freedom 
# Null hypothesis probability =   7.124253e-01
 
Photon flux (15-150 keV)    in 336.4 sec: 0.128590 ( -0.008568  0.008564 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.12245e-06 ( -2.51701e-07  2.5435e-07 ) ergs/cm2

Band function

Time interval is from  -99.388 sec. to  236.964 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.33403E-02   ( -1.2586   1.53813 )
beta        : -1.92893    ( 1.92674   0.245627 )
Epeak [keV] : 51.0676      ( -12.8913 45.8963 )
Norm@50keV   : 8.78250E-03    ( -0.00870564   0.113693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.27 using 59 PHA bins.
# Reduced chi-squared =         0.8776 for     55 degrees of freedom 
# Null hypothesis probability =   7.276281e-01
 
Photon flux (15-150 keV)    in 336.4 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]    : 13.9994  (-0.973924  1.06342)
R^2/D10^2   : 1.92871E-02  (-0.00446804   0.00571881)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          86.28 using 59 PHA bins.
# Reduced chi-squared =          1.514 for     57 degrees of freedom 
# Null hypothesis probability =   7.391135e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.686e-07   3.093e-08
25- 50  9.989e-07   7.098e-08
50-150  1.289e-06   1.605e-07
15-150  2.557e-06   1.734e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 189.410       (-50.4969      -188.295)
Norm        : 0.546500       (-0.0337865     0.0366989)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.99 using 59 PHA bins.
# Reduced chi-squared =         0.9296 for     57 degrees of freedom 
# Null hypothesis probability =   6.262348e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.608e-07   4.188e-08
25- 50  8.810e-07   1.601e-07
50-150  1.899e-06   7.779e-07
15-150  3.241e-06   9.964e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.20386        (-1.87659      1.96558)
R1^2/D10^2  : 7.92140E-02        (-0.0348314      0.0881119)
kT2 [keV]   : 25.0309        (-5.61972      13.944)
R2^2/D10^2  : 1.68315E-03    (-0.00134063   0.0030635)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.36 using 59 PHA bins.
# Reduced chi-squared =         0.8975 for     55 degrees of freedom 
# Null hypothesis probability =   6.888924e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.918e-07   9.766e-08
25- 50  9.531e-07   2.311e-07
50-150  1.796e-06   7.975e-07
15-150  3.141e-06   8.972e-07

Peak spectrum fit

Power-law model

Time interval is from  198.840 sec. to  199.840 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02255     ( -0.278247   0.265029 )
Norm@50keV  : 5.33386E-03    ( -0.000921252   0.000917307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9767 for     57 degrees of freedom 
# Null hypothesis probability =   5.249357e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.614868 ( -0.107951  0.108527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.72308e-08 ( -1.0263e-08  1.03386e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  198.840 sec. to  199.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99129     ( -3.39522   1.97068 )
Epeak [keV] : 73.7237      ( -12.4783 34.501 )
Norm@50keV  : 0.114795    ( -0.121567   2.77022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.03 using 59 PHA bins.
# Reduced chi-squared =         0.8399 for     56 degrees of freedom 
# Null hypothesis probability =   7.976906e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.543063 ( -0.116844  0.119272 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87663e-08 ( -1.09917e-08  1.17274e-08 ) ergs/cm2

Band function

Time interval is from  198.840 sec. to  199.840 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.29915   ( -3.09833   -3.29221 )
beta        : -2.42954    ( 2.43083   0.989069 )
Epeak [keV] : 64.2431      ( -14.2321 32.1477 )
Norm@50keV   : 0.502832    ( -0.488871   1.55004 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.53 using 59 PHA bins.
# Reduced chi-squared =         0.8461 for     55 degrees of freedom 
# Null hypothesis probability =   7.847174e-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]    : 19.6851  (-3.03836  3.97144)
R^2/D10^2   : 3.33587E-02  (-0.0152632   0.0249777)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.23 using 59 PHA bins.
# Reduced chi-squared =         0.8286 for     57 degrees of freedom 
# Null hypothesis probability =   8.185967e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.507e-09   8.380e-10
25- 50  1.236e-08   3.395e-09
50-150  3.542e-08   1.084e-08
15-150  5.028e-08   1.287e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-44.2003      -200)
Norm        : 2.53337       (-0.450893     0.450893)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.50 using 59 PHA bins.
# Reduced chi-squared =          1.132 for     57 degrees of freedom 
# Null hypothesis probability =   2.310945e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.312e-09   3.670e-09
25- 50  1.214e-08   6.935e-09
50-150  2.663e-08   1.534e-08
15-150  4.508e-08   2.583e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.00027E-04        (4.93688e-08      -0.000100027)
R1^2/D10^2  : 2739.93        (-2739.93      -2739.93)
kT2 [keV]   : 19.6851        (-3.03836      3.97144)
R2^2/D10^2  : 3.33587E-02    (-0.0152632   0.0249777)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.24 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.23 using 59 PHA bins.
# Reduced chi-squared =         0.8589 for     55 degrees of freedom 
# Reduced chi-squared =         0.8587 for     55 degrees of freedom 
# Null hypothesis probability =   7.622135e-01
# Null hypothesis probability =   7.626058e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.458e-09   8.655e-10
25- 50  1.221e-08   3.261e-09
50-150  3.597e-08   1.176e-08
15-150  5.064e-08   1.290e-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: 1.71942     ( -0.208815   0.216904 )
Norm@50keV  : 6.82912E-04    ( -9.77189e-05   9.62428e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.55 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.546924e-01
 
Photon flux (15-150 keV)    in 192.7 sec: 9.13220E-02 ( -0.0116949  0.0117005 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2167e-06 ( -1.79451e-07  1.82824e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.146678     ( -1.38633   1.06615 )
Epeak [keV] : 51.9582      ( -9.17321 22.4548 )
Norm@50keV  : 5.06668E-03    ( -0.00506669   0.0246556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.63 using 59 PHA bins.
# Reduced chi-squared =         0.9042 for     56 degrees of freedom 
# Null hypothesis probability =   6.775282e-01
 
Photon flux (15-150 keV)    in 192.7 sec: 8.68638E-02 ( -0.0120041  0.0120473 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07504e-06 ( -1.80751e-07  1.97149e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.146439   ( -0.599066   1.11987 )
beta        : -9.99986    ( 9.99986   19.9999 )
Epeak [keV] : 51.9470      ( -9.12401 22.4556 )
Norm@50keV   : 5.06881E-03    ( -0.00506881   0.0275855 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.63 using 59 PHA bins.
# Reduced chi-squared =         0.9206 for     55 degrees of freedom 
# Null hypothesis probability =   6.420506e-01
 
Photon flux (15-150 keV)    in 192.7 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)  = 8.44e-07
S(50-100 keV) = 1.16e-06

T90 vs. Hardness ratio plot

T90                                   = 316.347999989986 sec.
Hardness ratio (energy fluence ratio) = 1.37441

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.61868
Count Ratio (50-100 keV) / (15-25 keV) = 1.0597

Mask shadow pattern

IMX = 6.524524203051942E-02, IMY = 5.083099097321186E-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 -99.388000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
105.9511  21.1545    2.8  54.5  161.7   2.9055   4.2 ------	UNKNOWN                       
281.8737  81.3013    2.0  41.0  -83.6   3.1998   5.7 ------	UNKNOWN

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

Time interval of the image:
-99.388000 93.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
192.0037  26.8091    2.5  33.8   36.2   1.2458   4.6 ------	UNKNOWN                       
195.0570  78.6771    1.6  27.1  -82.7   1.8476   7.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
141.100600 963.087400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4638  35.3505    1.5  49.6  -13.5   5.4074   7.9    0.6	Her X-1                       
219.9736  42.4195    2.2  37.5   23.1   2.3928   5.3 ------	UNKNOWN                       
203.9956  65.1709    3.4  13.7   37.7   1.0316   3.4 ------	UNKNOWN                       
 79.9091  41.4247    3.7  54.1  177.1   4.1985   3.1 ------	UNKNOWN                       
194.7248  78.6615    1.2   0.0 -123.2   3.3293   9.8 ------	UNKNOWN                       
272.4950  47.9191    2.9  40.9  -36.4   2.1210   3.9 ------	UNKNOWN                       
 31.1530  48.6361    3.6  52.4 -139.4   7.3912   3.2 ------	UNKNOWN                       
 18.6738  53.3704    3.4  48.0 -128.9   6.6463   3.4 ------	UNKNOWN

Plot creation:
Sun Mar 20 23:45:40 EDT 2016