batgrbproduct Analysis for Trigger=526660

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sun Jul 15 22:22:45 EDT 2012
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger526660/GCN5_download_cron
======================================================================

  Trigger: 00526660      Segment: 000

  BAT Trigger Time: 364019478.008   [s; MET]
      Trigger Stop: 364019478.016   [s; MET]
               UTC: 2012-07-15T04:31:08.580840    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 280.349573941703   Dec: -4.95792801754117  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.39
     Image Trigger?:     NO
     Rate S/N Ratio:     25.1793566240283  [ if not an image trigger ]
     Image S/N Ratio:    7.39

  Flight Position:   [ source = BAT ]
    RA: 280.349573941703   Dec: -4.95792801754117  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 280.374277749728   Dec: -4.9231688957825  [deg; J2000]  
        { 18h 41m 29.8s , -04d 55' 23.4" }
         +/- 2.50317110772759 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.39654444200054 [arcmin] (formal 1-sigma fit error)
    SNR: 8.20061047607974
 
  Angular difference between Flight and Ground position is 2.555428 arcmin
 
  Partial Coding Fraction: 0.4492188    [ including projection effects ]

  Duration
     T90: 0.0119999647140503 +/- 0.012649079728912
        Measured from: -0.00799989700317383
                   to: 0.00400006771087646     [s; relative to TRIGTIME]
     T50: 0.00399994850158691 +/- 0.00400000810623169
        Measured from: -0.00399988889694214
                   to: 5.96046447753906e-08     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.495999991893768     
                   to: 0.504000008106232     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.00800001621246338     
                   to: 0.0119999647140503     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.015015   0.018186   0.005084  -0.000793
           0.002758   0.002941   0.002015   0.000906 [error]
 Peak      0.010571   0.017221   0.001399   0.012722
           0.010336   0.009323   0.008084   0.006884 [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 4.36e-09 4.00e-09 2.54e-09 2.47e-09 1.19e-08 1.34e-08   erg/cm2
              Error 1.13e-09 1.07e-09 1.15e-09 1.95e-09 3.25e-09 4.25e-09   erg/cm2
Peak flux Power-law 9.00e-02 9.38e-02 6.91e-02 8.20e-02 2.85e-01 3.35e-01   ph/cm2/s
              Error 1.16e-01 8.63e-02 6.16e-02 4.71e-01 2.26e-01 3.61e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.75e-09 6.56e-09 2.52e-09 1.05e-10 1.29e-08 0.00e+00   erg/cm2
              Error 1.37e-09 1.87e-09 1.56e-09 3.25e-10 3.13e-09 0.00e+00   erg/cm2
Peak flux Cutoff-PL 8.94e-02 9.45e-02 6.94e-02 7.57e-02 2.84e-01 3.25e-01   ph/cm2/s
              Error 8.04e-02 1.06e-01 7.17e-02 1.47e-01 2.26e-01 2.96e-01   ph/cm2/s
 
Fluence        Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.660    0.403    -      -           5.68e-02 2.02e-02   50.050 57
CPL  -0.617    2.448      32.2    9.9      5.39e+00 1.68e+02   40.610 56
 
The chi2 of BB fit is 40.81 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    1.441    2.088    -      -           2.31e-03 2.05e-03   43.790 57
CPL   1.391    4.278     536.1    0.0      2.47e-03 0.00e+00   43.790 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    0.020   -0.008    0.012
T90     0.012   -0.008    0.004
T50     0.004   -0.004    0.000
Peak    1.000   -0.496    0.504

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  280.3743  -4.9232 0.0235   27.5   62.2       0.0388     8.2  TRIG_00526660       
------------------------------------------
 
Foreground time interval of the image:
 -0.008   0.012 (delta_t =   0.020 [sec])
Background time interval of the image:
-119.008  -0.008 (delta_t = 119.000 [sec])

Lightcurves

Notes:

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)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.008 sec. to    0.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.65959     ( -0.356096   0.44954 )
Norm@50keV  : 5.68363E-02    ( -0.0202114   0.0200948 )
------------------------------------------------------------
# Chi-Squared =          50.05 using 59 PHA bins.
# Reduced chi-squared =         0.8780 for     57 degrees of freedom 
# Null hypothesis probability =   7.312727e-01
 
Photon flux (15-150 keV)    in 0.02 sec: 12.3534 ( -2.92058  2.92168 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.194e-08 ( -3.20262e-09  3.29578e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.008 sec. to    0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.616985     ( -2.92156   1.97402 )
Epeak [keV] : 32.2061      ( -12.4492 7.42396 )
Norm@50keV  : 5.39364    ( -6.54188   330.117 )
------------------------------------------------------------
# Chi-Squared =          40.61 using 59 PHA bins.
# Reduced chi-squared =         0.7252 for     56 degrees of freedom 
# Null hypothesis probability =   9.393406e-01
 
Photon flux (15-150 keV)    in 0.02 sec: 13.2232 ( -2.9336  2.9347 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29397e-08 ( -3.09092e-09  3.17832e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.008 sec. to    0.012 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.883230   ( -2.9397   2.39508 )
beta        : -9.99966    ( 9476.5   9486.5 )
Epeak [keV] : 32.7560      ( -12.4486 7.38622 )
Norm@50keV   : 7.70763    ( -6.55935   325.516 )
------------------------------------------------------------
# Chi-Squared =          40.61 using 59 PHA bins.
# Reduced chi-squared =         0.7383 for     55 degrees of freedom 
# Null hypothesis probability =   9.263610e-01
 
Photon flux (15-150 keV)    in 0.02 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]    : 8.76643  (-1.66937  1.67157)
R^2/D10^2   : 11.5724  (-5.92576   14.5118)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =          40.81 using 59 PHA bins.
# Reduced chi-squared =         0.7159 for     57 degrees of freedom 
# Null hypothesis probability =   9.480180e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.414e-09   1.353e-09
25- 50  6.961e-09   2.520e-09
50-150  2.449e-09   1.403e-09
15-150  1.282e-08   4.886e-09
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 31.0526       (-9.76712      13.8908)
Norm        : 106.668       (-33.7654     49.9495)
------------------------------------------------------------
# Chi-Squared =          43.68 using 59 PHA bins.
# Reduced chi-squared =         0.7663 for     57 degrees of freedom 
# Null hypothesis probability =   9.027085e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.417e-09   1.249e-09
25- 50  5.143e-09   1.673e-09
50-150  2.946e-09   1.918e-09
15-150  1.251e-08   4.123e-09
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.12557        (-3.26424      31.7036)
R1^2/D10^2  : 239.132        (-207.32      -207.32)
kT2 [keV]   : 9.47965        (-2.07166      -9.52114)
R2^2/D10^2  : 7.61612    (-7.43891   14.2012)
------------------------------------------------------------
# Chi-Squared =          39.79 using 59 PHA bins.
# Reduced chi-squared =         0.7234 for     55 degrees of freedom 
# Null hypothesis probability =   9.389565e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.880e-09   2.109e-09
25- 50  6.476e-09   3.865e-09
50-150  2.804e-09   1.952e-09
15-150  1.316e-08   7.450e-09

Peak spectrum fit

Power-law model
Time interval is from   -0.496 sec. to    0.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.44123     ( -2.41464   1.76088 )
Norm@50keV  : 2.31434E-03    ( -0.00231434   0.00178119 )
------------------------------------------------------------
# Chi-Squared =          43.79 using 59 PHA bins.
# Reduced chi-squared =         0.7683 for     57 degrees of freedom 
# Null hypothesis probability =   9.004448e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.284598 ( -0.222942  0.229508 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21824e-08 ( -1.75897e-08  1.88823e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.496 sec. to    0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.39051     ( -0.959475   7.59746 )
Epeak [keV] : 536.080      (   )
Norm@50keV  : 2.46971E-03    ( -0.00248672   -0.00248672 )
------------------------------------------------------------
# Chi-Squared =          43.79 using 59 PHA bins.
# Reduced chi-squared =         0.7820 for     56 degrees of freedom 
# Null hypothesis probability =   8.821069e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.284120 ( -0.222681  0.229665 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.83976e-08 ( -3.83976e-08  8.21934e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.496 sec. to    0.504 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.99987   ( -14999.4   -14999.4 )
beta        : -1.84470    ( 1.86791   1.86791 )
Epeak [keV] : 29.1228      ( -28.5853 70.3729 )
Norm@50keV   : 109.335    ( -125.878   5.7826e+06 )
------------------------------------------------------------
# Chi-Squared =          43.31 using 59 PHA bins.
# Reduced chi-squared =         0.7874 for     55 degrees of freedom 
# Null hypothesis probability =   8.730077e-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]    : 12.2746  (-8.15559  -12.3223)
R^2/D10^2   : 6.50256E-02  (-0.0636924   3.71895)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared =          44.22 using 59 PHA bins.
# Reduced chi-squared =         0.7758 for     57 degrees of freedom 
# Null hypothesis probability =   8.919126e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.075e-09   1.512e-09
25- 50  6.705e-09   5.220e-09
50-150  6.165e-09   5.565e-09
15-150  1.495e-08   1.204e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (-199.954      -199.954)
Norm        : 1.17780       (-0.904012     0.96672)
------------------------------------------------------------
# Chi-Squared =          43.81 using 59 PHA bins.
# Reduced chi-squared =         0.7685 for     57 degrees of freedom 
# Null hypothesis probability =   9.001789e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.933e-09   2.229e-09
25- 50  5.642e-09   4.083e-09
50-150  1.237e-08   8.865e-09
15-150  2.095e-08   1.576e-08
Double BB
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 94.6919        (      )
R1^2/D10^2  : 1.29216E-04        (-0.000129552      -0.000129552)
kT2 [keV]   : 8.75058        (-8.75532      85.2625)
R2^2/D10^2  : 0.191271    (-0.190621   -0.190621)
------------------------------------------------------------
# Chi-Squared =          43.49 using 59 PHA bins.
# Chi-Squared =          43.43 using 59 PHA bins.
# Reduced chi-squared =         0.7907 for     55 degrees of freedom 
# Reduced chi-squared =         0.7897 for     55 degrees of freedom 
# Null hypothesis probability =   8.686746e-01
# Null hypothesis probability =   8.700027e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.044e-09   2.490e-09
25- 50  6.056e-09   4.490e-09
50-150  1.363e-08   9.825e-09
15-150  2.273e-08   1.474e-08
Plot creation:
Sun Jul 15 22:32:57 EDT 2012