batgrbproduct analysis for trigger=286809

batgrbproduct Analysis for Trigger=286809

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): Mon Jan 20 08:01:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger286809
======================================================================

  Trigger: 00286809      Segment: 000

  BAT Trigger Time: 207731248   [s; MET]
      Trigger Stop: 207731312   [s; MET]
               UTC: 2007-08-02T07:07:25.872160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 36.850987019423   Dec: -55.5364556715457  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.15
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.15

  Flight Position:   [ source = BAT ]
    RA: 36.850987019423   Dec: -55.5364556715457  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 36.9041697866925   Dec: -55.5176559558811  [deg; J2000]  
        { 02h 27m 37.0s , -55d 31' 03.6" }
         +/- 1.99292433539677 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.822207385364391 [arcmin] (formal 1-sigma fit error)
    SNR: 11.3572808452912
 
  Angular difference between Flight and Ground position is 2.129434 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 15.8000000119209 +/- 2.50065271085923
        Measured from: 5.53999999165535
                   to: 21.3400000035763     [s; relative to TRIGTIME]
     T50: 9.03200000524521 +/- 2.45140365771526
        Measured from: 8.26800000667572
                   to: 17.3000000119209     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.15599998831749     
                   to: 7.15599998831749     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 4.80399999022484     
                   to: 22.7680000066757     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.146602   0.205848   0.105335   0.043499
           0.023249   0.023931   0.020836   0.018238 [error]
 Peak      0.026411   0.009428   0.018689   0.002672
           0.005437   0.005912   0.004984   0.004168 [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 4.89e-08 7.71e-08 9.17e-08 2.12e-07 2.79e-07 4.30e-07   erg/cm2
              Error 1.02e-08 1.08e-08 2.01e-08 9.44e-08 4.71e-08 1.14e-07   erg/cm2
Peak flux Power-law 2.48e-01 1.40e-01 5.02e-02 2.36e-02 4.51e-01 4.62e-01   ph/cm2/s
              Error 9.63e-02 6.28e-02 4.89e-02 4.21e-02 1.40e-01 1.50e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.57e-08 8.41e-08 9.02e-08 6.73e-08 2.59e-07 2.87e-07   erg/cm2
              Error 1.16e-08 1.57e-08 2.38e-08 1.21e-07 5.55e-08 1.56e-07   erg/cm2
Peak flux Cutoff-PL 2.60e-01 1.31e-01 4.01e-02 1.57e-02 4.41e-01 4.46e-01   ph/cm2/s
              Error -------- -------- -------- 4.28e-02 1.42e-01 1.53e-01   ph/cm2/s
 
Fluence        Band 4.38e-08 8.73e-08 8.56e-08 1.30e-07 2.63e-07 3.49e-07   erg/cm2
              Error 1.22e-08 -------- -------- -------- -------- --------   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    1.750    0.252    -      -           1.68e-03 2.73e-04   54.980 57
CPL   1.039    1.027      58.3    0.0      4.25e-03 0.00e+00   53.810 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.479    1.115    -      -           2.32e-03 1.89e-03   56.210 57
CPL   1.973    0.000       4.8    0.0      3.76e-03 0.00e+00   56.940 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   17.964    4.804   22.768
T90    15.800    5.540   21.340
T50     9.032    8.268   17.300
Peak    1.000    6.156    7.156

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
   36.9042   -55.5177   0.0169    25.4461    28.4818         0.5170895     11.357 TRIG_00286809                 
 
Foreground time interval of the image:
  4.804  22.768 (delta_t =  17.964 [sec])
Background time interval of the image:
-134.499   4.804 (delta_t = 139.303 [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    4.804 sec. to   22.768 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75011     ( -0.246435   0.258453 )
Norm@50keV  : 1.68463E-03    ( -0.000275859   0.000269354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.98 using 59 PHA bins.
# Reduced chi-squared =         0.9646 for     57 degrees of freedom 
# Null hypothesis probability =   5.512148e-01
 
Photon flux (15-150 keV)    in 17.96 sec: 0.227799 ( -0.0320891  0.0320999 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79181e-07 ( -4.6559e-08  4.7733e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.804 sec. to   22.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03880     ( -1.49318   0.560724 )
Epeak [keV] : 58.2935      (   )
Norm@50keV  : 4.25380E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.81 using 59 PHA bins.
# Reduced chi-squared =         0.9609 for     56 degrees of freedom 
# Null hypothesis probability =   5.581228e-01
 
Photon flux (15-150 keV)    in 17.96 sec: 0.221603 ( -0.033646  0.033548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.5878e-07 ( -5.3871e-08  5.71308e-08 ) ergs/cm2

Band function

Time interval is from    4.804 sec. to   22.768 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.351871   ( 0.481696   0.481696 )
beta        : -2.16687    ( 2.17163   0.556405 )
Epeak [keV] : 43.9278      ( -43.3573 206.504 )
Norm@50keV   : 1.19289E-02    ( -0.0137151   45.0661 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.15 using 59 PHA bins.
# Reduced chi-squared =         0.9664 for     55 degrees of freedom 
# Null hypothesis probability =   5.456508e-01
 
Photon flux (15-150 keV)    in 17.96 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.62963e-07 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.1404  (-1.66316  2.03874)
R^2/D10^2   : 7.34953E-02  (-0.0342303   0.0604926)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.25 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     57 degrees of freedom 
# Null hypothesis probability =   3.589049e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.431e-08   8.360e-09
25- 50  9.861e-08   2.044e-08
50-150  6.980e-08   2.172e-08
15-150  2.027e-07   4.324e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 106.685       (-43.635      -105.845)
Norm        : 0.994301       (-0.171422     0.232226)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.91 using 59 PHA bins.
# Reduced chi-squared =         0.9459 for     57 degrees of freedom 
# Null hypothesis probability =   5.915853e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.666e-08   9.456e-09
25- 50  8.171e-08   1.782e-08
50-150  1.372e-07   8.717e-08
15-150  2.656e-07   1.029e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.39354        (-4.05342      2.43076)
R1^2/D10^2  : 0.166932        (-0.0991384      0.955194)
kT2 [keV]   : 32.5868        (-19.4136      -33.1108)
R2^2/D10^2  : 8.71910E-04    (-0.000817769   0.0278673)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.36 using 59 PHA bins.
# Reduced chi-squared =         0.9702 for     55 degrees of freedom 
# Null hypothesis probability =   5.375570e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.196e-08   2.160e-08
25- 50  9.073e-08   4.533e-08
50-150  1.367e-07   7.799e-08
15-150  2.694e-07   1.382e-07

Peak spectrum fit

Power-law model

Time interval is from    6.156 sec. to    7.156 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.47950     ( -0.747745   1.48323 )
Norm@50keV  : 2.32455E-03    ( -0.00231934   0.00145932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.21 using 59 PHA bins.
# Reduced chi-squared =         0.9862 for     57 degrees of freedom 
# Null hypothesis probability =   5.046361e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.450831 ( -0.140812  0.138197 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.30815e-08 ( -1.11223e-08  1.16623e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.156 sec. to    7.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97271     (     )
Epeak [keV] : 4.78266      (   )
Norm@50keV  : 3.76346E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.94 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     56 degrees of freedom 
# Null hypothesis probability =   4.397946e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.440821 ( -0.13418  0.150714 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32669e-08 ( -1.12039e-08  1.14891e-08 ) ergs/cm2

Band function

Time interval is from    6.156 sec. to    7.156 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -2.92801   ( 2.92801   2.92801 )
beta        : -2.48471    ( -1.47606   0.748592 )
Epeak [keV] : 27.3668      ( -27.3668 -27.3668 )
Norm@50keV   : 0.314792    ( -0.315068   0.198505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.21 using 59 PHA bins.
# Reduced chi-squared =          1.022 for     55 degrees of freedom 
# Null hypothesis probability =   4.292896e-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]    : 3.12987  (-0.979877  1.69184)
R^2/D10^2   : 34.8797  (-34.8976   356.188)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.06 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     57 degrees of freedom 
# Null hypothesis probability =   3.322485e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.444e-09   5.030e-09
25- 50  1.424e-09   9.950e-10
50-150  3.211e-12   3.758e-12
15-150  9.871e-09   5.735e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 51.8729       (      )
Norm        : 2.48456       (-1.05958     35.5836)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.48 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     57 degrees of freedom 
# Null hypothesis probability =   4.207195e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.317e-09   5.105e-09
25- 50  3.323e-09   2.269e-09
50-150  1.957e-10   2.022e-10
15-150  1.184e-08   7.265e-09

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.57593        (-0.904264      1.19597)
R1^2/D10^2  : 97.1390        (-86.7291      2257.76)
kT2 [keV]   : 18.5524        (-6.20253      12.2986)
R2^2/D10^2  : 1.67337E-02    (-0.013936   0.0511543)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.54 using 59 PHA bins.
# Reduced chi-squared =         0.9007 for     55 degrees of freedom 
# Null hypothesis probability =   6.826002e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.746e-09   4.352e-09
25- 50  5.946e-09   3.652e-09
50-150  1.359e-08   9.105e-09
15-150  2.728e-08   1.557e-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: 1.75011     ( -0.246435   0.258453 )
Norm@50keV  : 1.68463E-03    ( -0.000275859   0.000269354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.98 using 59 PHA bins.
# Reduced chi-squared =         0.9646 for     57 degrees of freedom 
# Null hypothesis probability =   5.512148e-01
 
Photon flux (15-150 keV)    in 17.96 sec: 0.227799 ( -0.0320891  0.0320999 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79181e-07 ( -4.6559e-08  4.7733e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03880     ( -1.49318   0.560724 )
Epeak [keV] : 58.2935      (   )
Norm@50keV  : 4.25380E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.81 using 59 PHA bins.
# Reduced chi-squared =         0.9609 for     56 degrees of freedom 
# Null hypothesis probability =   5.581228e-01
 
Photon flux (15-150 keV)    in 17.96 sec: 0.221603 ( -0.033646  0.033548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.5878e-07 ( -5.3871e-08  5.71308e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.351871   ( 0.481696   0.481696 )
beta        : -2.16687    ( 2.17163   0.556405 )
Epeak [keV] : 43.9278      ( -43.3573 321.63 )
Norm@50keV   : 1.19289E-02    ( -0.0137151   44.5394 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.15 using 59 PHA bins.
# Reduced chi-squared =         0.9664 for     55 degrees of freedom 
# Null hypothesis probability =   5.456508e-01
 
Photon flux (15-150 keV)    in 17.96 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.62963e-07 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 7.71e-08
S(50-100 keV) = 9.17e-08

T90 vs. Hardness ratio plot

T90                                   = 15.8000000119209 sec.
Hardness ratio (energy fluence ratio) = 1.18936

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.40413
Count Ratio (50-100 keV) / (15-25 keV) = 0.71851

Mask shadow pattern

IMX = 4.182326421089206E-01, IMY = -2.269102216803238E-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:
-134.499400 4.804000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 10.8272   1.3164    2.5  43.1  153.9   1.1254   4.6 ------	UNKNOWN                       
 16.4300  11.0854    2.0  47.9  168.1   1.6811   5.9 ------	UNKNOWN

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

Time interval of the image:
4.804000 22.768000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 36.9042 -55.5176    1.0  25.4   28.5   0.5171  11.4 ------	UNKNOWN                       
 33.2280   3.7886    2.3  35.0 -172.3   0.2391   5.0 ------	UNKNOWN                       
106.9305 -42.8774    2.3  52.6  -34.6   0.8232   5.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
121.900600 947.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2149 -60.6023   23.5  58.1  -18.7   1.1724   0.5    3.2	Cen X-3                       
 93.9010 -77.7670    2.6  29.4  -15.1   1.8159   4.4 ------	UNKNOWN

Plot creation:
Sun May 31 09:31:51 EDT 2015