batgrbproduct analysis for trigger=615672

batgrbproduct Analysis for Trigger=615672

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): Sat Nov  1 22:16:56 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger615672
======================================================================

  Trigger: 00615672      Segment: 000

  BAT Trigger Time: 435263140.672   [s; MET]
      Trigger Stop: 435263141.696   [s; MET]
               UTC: 2014-10-17T18:25:28.004480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 93.6292819665991   Dec: -58.5544655852862  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.16
     Image Trigger?:     NO
     Rate S/N Ratio:     15.4596248337403  [ if not an image trigger ]
     Image S/N Ratio:    11.16

  Flight Position:   [ source = BAT ]
    RA: 93.6292819665991   Dec: -58.5544655852862  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 93.6067956086993   Dec: -58.6051136285773  [deg; J2000]  
        { 06h 14m 25.6s , -58d 36' 18.4" }
         +/- 2.21007840622997 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.16222223178023 [arcmin] (formal 1-sigma fit error)
    SNR: 9.7973225609784
 
  Angular difference between Flight and Ground position is 3.119214 arcmin
 
  Partial Coding Fraction: 0.640625    [ including projection effects ]

  Duration
     T90: 55.8079999089241 +/- 2.86416207927003
        Measured from: 0.776000022888184
                   to: 56.5839999318123     [s; relative to TRIGTIME]
     T50: 4.02399998903275 +/- 0.286803016098481
        Measured from: 46.2879999876022
                   to: 50.311999976635     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 46.6040000319481     
                   to: 47.6040000319481     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.21999996900558     
                   to: 65.5760000348091     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.415875   1.992914   1.400935   0.272170
           0.053974   0.056082   0.048542   0.039290 [error]
 Peak      0.154044   0.303938   0.269562   0.063284
           0.008124   0.009727   0.009420   0.005915 [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 4.45e-07 7.89e-07 1.07e-06 3.00e-06 3.10e-06 5.30e-06   erg/cm2
              Error 2.85e-08 2.97e-08 4.85e-08 3.00e-07 1.17e-07 3.32e-07   erg/cm2
Peak flux Power-law 1.65e+00 1.98e+00 1.72e+00 2.55e+00 6.25e+00 7.91e+00   ph/cm2/s
              Error 1.17e-01 8.69e-02 7.40e-02 2.29e-01 2.42e-01 3.13e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.00e-07 8.23e-07 1.11e-06 1.47e-06 2.98e-06 3.80e-06   erg/cm2
              Error 3.52e-08 3.45e-08 5.35e-08 4.89e-07 1.32e-07 5.01e-07   erg/cm2
Peak flux Cutoff-PL 1.39e+00 2.07e+00 1.87e+00 1.35e+00 6.08e+00 6.67e+00   ph/cm2/s
              Error 1.46e-01 9.80e-02 9.31e-02 3.06e-01 2.49e-01 3.95e-01   ph/cm2/s
 
Fluence        Band 3.96e-07 8.19e-07 1.10e-06 1.54e-06 2.98e-06 3.87e-06   erg/cm2
              Error 3.07e-08 -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 1.41e+00 2.06e+00 1.86e+00 1.47e+00 6.10e+00 6.81e+00   ph/cm2/s
              Error -------- 9.87e-02 7.97e-02 -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.559    0.064    -      -           4.94e-03 1.73e-04   52.010 57
CPL   1.028    0.272      94.1   29.0      8.95e-03 2.72e-03   39.410 56
 
The chi2 of BB fit is -------- which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.205    0.063    -      -           5.32e-02 2.00e-03   69.580 57
CPL   0.483    0.281     117.3   28.0      1.14e-01 3.36e-02   47.160 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: 10.432000 sec.
T50 in the 50-300 keV band: 3.264000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   66.796   -1.220   65.576
T90    55.808    0.776   56.584
T50     4.024   46.288   50.312
Peak    1.000   46.604   47.604

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
   93.6068   -58.6051   0.0197    35.8953  -155.1040         0.5347323      9.797 TRIG_00615672                 
 
Foreground time interval of the image:
 -1.220  16.429 (delta_t =  17.649 [sec])
Background time interval of the image:
-239.672  -1.220 (delta_t = 238.452 [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   -1.220 sec. to   65.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.55949     ( -0.06365   0.0638422 )
Norm@50keV  : 4.93882E-03    ( -0.000173547   0.000173378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.01 using 59 PHA bins.
# Reduced chi-squared =         0.9124 for     57 degrees of freedom 
# Null hypothesis probability =   6.623564e-01
 
Photon flux (15-150 keV)    in 66.8 sec: 0.626955 ( -0.0230608  0.0231115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.1017e-06 ( -1.16645e-07  1.17e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.220 sec. to   65.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02753     ( -0.280398   0.263604 )
Epeak [keV] : 94.0829      ( -16.3555 41.5678 )
Norm@50keV  : 8.95198E-03    ( -0.0022344   0.00320633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.41 using 59 PHA bins.
# Reduced chi-squared =         0.7037 for     56 degrees of freedom 
# Null hypothesis probability =   9.546882e-01
 
Photon flux (15-150 keV)    in 66.8 sec: 0.605733 ( -0.025042  0.025101 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97701e-06 ( -1.32237e-07  1.32144e-07 ) ergs/cm2

Band function

Time interval is from   -1.220 sec. to   65.576 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.01982   ( -0.269772   0.241092 )
beta        : -9.36215    ( 9.37119   19.3712 )
Epeak [keV] : 94.1777      ( -11.8333 39.0891 )
Norm@50keV   : 8.99501E-03    ( -0.00213006   0.00168168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.42 using 59 PHA bins.
# Reduced chi-squared =         0.7166 for     55 degrees of freedom 
# Null hypothesis probability =   9.440921e-01
 
Photon flux (15-150 keV)    in 66.8 sec: 0.607538 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97669e-06 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 15.1439  (  )
R^2/D10^2   : 6.64049E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         174.35 using 59 PHA bins.
# Reduced chi-squared =         3.0589 for     57 degrees of freedom 
# Null hypothesis probability =   8.002969e-14
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.126e-07   1.513e-08
25- 50  8.524e-07   3.975e-08
50-150  1.336e-06   8.884e-08
15-150  2.401e-06   9.619e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.269       (-35.3348      -199.277)
Norm        : 2.54240       (-0.0878288     0.0974411)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.46 using 59 PHA bins.
# Reduced chi-squared =         0.7274 for     57 degrees of freedom 
# Null hypothesis probability =   9.393431e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.229e-07   1.573e-08
25- 50  8.135e-07   2.772e-08
50-150  1.784e-06   6.880e-08
15-150  3.020e-06   1.106e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.33392        (-0.957238      1.03653)
R1^2/D10^2  : 0.516094        (-0.176459      0.309325)
kT2 [keV]   : 24.6592        (-2.75383      3.87451)
R2^2/D10^2  : 9.17341E-03    (-0.00390566   0.00540247)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.34 using 59 PHA bins.
# Reduced chi-squared =         0.6970 for     55 degrees of freedom 
# Null hypothesis probability =   9.573017e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.771e-07   4.947e-08
25- 50  8.340e-07   7.983e-08
50-150  1.750e-06   2.588e-07
15-150  2.961e-06   2.869e-07

Peak spectrum fit

Power-law model

Time interval is from   46.604 sec. to   47.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20494     ( -0.0631831   0.0631408 )
Norm@50keV  : 5.32490E-02    ( -0.00199675   0.00199675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.58 using 59 PHA bins.
# Reduced chi-squared =          1.221 for     57 degrees of freedom 
# Null hypothesis probability =   1.224860e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.25472 ( -0.241524  0.24173 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.39483e-07 ( -2.22792e-08  2.23272e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   46.604 sec. to   47.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.482849     ( -0.28975   0.272645 )
Epeak [keV] : 117.254      ( -18.776 37.2298 )
Norm@50keV  : 0.114099    ( -0.0278407   0.0393437 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.16 using 59 PHA bins.
# Reduced chi-squared =         0.8421 for     56 degrees of freedom 
# Null hypothesis probability =   7.939335e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.07661 ( -0.24935  0.24958 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.22491e-07 ( -2.3766e-08  2.3697e-08 ) ergs/cm2

Band function

Time interval is from   46.604 sec. to   47.604 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.482801   ( -0.232753   0.339859 )
beta        : -10.0000    ( 10   3.55271e-15 )
Epeak [keV] : 117.236      ( -15.7214 37.1717 )
Norm@50keV   : 0.114103    ( -0.0278558   0.0393494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.16 using 59 PHA bins.
# Reduced chi-squared =         0.8574 for     55 degrees of freedom 
# Null hypothesis probability =   7.649008e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.10444 (    ) 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]    : 19.0343  (  )
R^2/D10^2   : 0.347749  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         130.51 using 59 PHA bins.
# Reduced chi-squared =         2.2896 for     57 degrees of freedom 
# Null hypothesis probability =   1.080970e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.475e-08   1.815e-09
25- 50  1.192e-07   6.400e-09
50-150  3.175e-07   1.900e-08
15-150  4.614e-07   2.105e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 25.9065       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         140.84 using 59 PHA bins.
# Reduced chi-squared =         2.4709 for     57 degrees of freedom 
# Null hypothesis probability =   4.774595e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.451e-08   2.720e-09
25- 50  1.241e-07   5.300e-09
50-150  2.722e-07   1.100e-08
15-150  4.608e-07   1.945e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.57627        (-1.45268      1.62693)
R1^2/D10^2  : 2.30146        (-0.862279      1.67814)
kT2 [keV]   : 28.3136        (-3.23865      4.92086)
R2^2/D10^2  : 7.52773E-02    (-0.0335719   0.0403018)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.05 using 59 PHA bins.
# Reduced chi-squared =         0.8190 for     55 degrees of freedom 
# Null hypothesis probability =   8.285509e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.185e-08   6.715e-09
25- 50  1.220e-07   1.659e-08
50-150  3.607e-07   5.740e-08
15-150  5.246e-07   6.810e-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: 2.20217     ( -0.286058   0.31703 )
Norm@50keV  : 1.56926E-03    ( -0.000370654   0.000366521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.77 using 59 PHA bins.
# Reduced chi-squared =          1.242 for     57 degrees of freedom 
# Null hypothesis probability =   1.038483e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.260095 ( -0.044681  0.0446848 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.60546e-07 ( -5.32338e-08  5.53548e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07381     ( -3.09449   1.76581 )
Epeak [keV] : 34.0417      ( -6.09872 6.33682 )
Norm@50keV  : 0.174041    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.14 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     56 degrees of freedom 
# Null hypothesis probability =   3.281579e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.249260 ( -0.043785  0.043966 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.19868e-07 ( -4.22347e-08  4.77962e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.991710   ( -1.88647   3.76232 )
beta        : -9.37167    ( 9.37167   19.3664 )
Epeak [keV] : 34.0800      ( -6.16113 6.23298 )
Norm@50keV   : 0.152195    ( -0.173204   41.5258 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.17 using 59 PHA bins.
# Reduced chi-squared =          1.094 for     55 degrees of freedom 
# Null hypothesis probability =   2.939997e-01
 
Photon flux (15-150 keV)    in 17.65 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.19951e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 7.89e-07
S(50-100 keV) = 1.07e-06

T90 vs. Hardness ratio plot

T90                                   = 55.8079999089241 sec.
Hardness ratio (energy fluence ratio) = 1.35615

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.40755
Count Ratio (50-100 keV) / (15-25 keV) = 0.989448

Mask shadow pattern

IMX = -6.564982887578933E-01, IMY = 3.046800597565147E-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:
-239.672000 -1.220000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
291.7812 -39.2873    2.7  56.8  -29.4   4.7644   4.2 ------	UNKNOWN

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

Time interval of the image:
-1.220000 16.428600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 84.7986 -34.3260    2.2  47.9  171.5   0.5441   5.3 ------	UNKNOWN                       
359.1092 -63.8022    2.2  11.5  -42.0   0.2164   5.1 ------	UNKNOWN                       
 93.6065 -58.6062    1.2  35.9 -155.1   0.5358   9.8 ------	UNKNOWN                       
111.6065 -78.0275    2.3  33.4 -119.2   0.3209   5.1 ------	UNKNOWN                       
120.7969 -44.3945    2.1  57.7 -153.4   1.3838   5.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
72.828600 962.460200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4758 -40.5504    1.3  31.8 -126.6   4.6205   8.9    2.4	Vela X-1                      
170.2679 -60.6246    2.9  36.6  -73.9   3.7941   4.0    1.4	Cen X-3                       
186.8363 -62.6765    8.1  41.9  -64.1   2.2373   1.4    7.5	GX 301-2                      
 99.7181 -33.7720    3.4  25.1  171.3   1.3304   3.4 ------	UNKNOWN                       
145.0484 -78.0674    2.8  25.6  -42.8   1.6020   4.2 ------	UNKNOWN                       
122.8509  -4.1136    2.8  59.0 -166.1  10.6223   4.1 ------	UNKNOWN

Plot creation:
Thu May 28 14:11:37 EDT 2015