batgrbproduct Analysis for Trigger=638589

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Tue Apr 21 18:36:49 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger638589/GCN5_download_cron
======================================================================

  Trigger: 00638589      Segment: 000

  BAT Trigger Time: 451242024   [s; MET]
      Trigger Stop: 451242368   [s; MET]
               UTC: 2015-04-20T17:00:10.527480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 87.8153793256478   Dec: -10.4224915475194  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    5.81
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    5.81

  Flight Position:   [ source = BAT ]
    RA: 87.8153793256478   Dec: -10.4224915475194  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 87.8726987649503   Dec: -10.5260531547643  [deg; J2000]  
        { 05h 51m 29.4s , -10d 31' 33.8" }
         +/- 4.95764855849086 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.67149484005019 [arcmin] (formal 1-sigma fit error)
    SNR: 3.08935152128523
 
  Angular difference between Flight and Ground position is 7.074389 arcmin
 
  Partial Coding Fraction: 0.796875    [ including projection effects ]

  Duration
     T90: 416.799999952316 +/- 48.3379910583562
        Measured from: 25.3720000982285
                   to: 442.172000050545     [s; relative to TRIGTIME]
     T50: 187.083999931812 +/- 22.8604140470588
        Measured from: 116.704000115395
                   to: 303.788000047207     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 178.796000003815     
                   to: 179.796000003815     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.8640000224113     
                   to: 499.959999978542     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.301468   4.407008   1.351704   1.787411
           0.164420   0.185683   0.163947   0.178283 [error]
 Peak      0.020381   0.016151   0.021352   0.019648
           0.007861   0.009141   0.008071   0.009480 [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 8.12e-07 1.33e-06 1.64e-06 4.01e-06 4.91e-06 7.79e-06   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 1.65e-01 1.70e-01 1.23e-01 1.43e-01 5.13e-01 6.00e-01   ph/cm2/s
              Error 9.92e-02 6.74e-02 6.72e-02 1.82e-01 1.99e-01 2.56e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.62e-07 1.86e-06 7.48e-07 1.47e-08 3.29e-06 3.29e-06   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL 1.38e-01 1.90e-01 1.31e-01 4.54e-02 4.92e-01 5.05e-01   ph/cm2/s
              Error 1.32e-01 9.14e-02 7.77e-02 9.17e-02 2.18e-01 2.27e-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    1.694    0.000    -      -           1.04e-03 0.00e+00  156.590 57
CPL  -2.246    0.000      38.4    0.0      2.96e-01 0.00e+00  125.580 56
 
The chi2 of BB fit is 127.88 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    1.464    0.737    -      -           4.15e-03 1.79e-03   42.870 57
CPL   0.324    1.051      70.1    0.0      1.64e-02 3.47e+02   42.580 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: 345.280000 sec.
T50 in the 50-300 keV band: 159.168000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  513.824  -13.864  499.960
T90   416.800   25.372  442.172
T50   187.084  116.704  303.788
Peak    1.000  178.796  179.796

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   87.8727 -10.5261 0.0621   16.5   69.4      14.2318     3.1  TRIG_00638589       
------------------------------------------
 
Foreground time interval of the image:
-13.864 154.480 (delta_t = 168.344 [sec])
156.000 419.040 (delta_t = 263.040 [sec])
420.000 495.301 (delta_t =  75.301 [sec])
Background time interval of the image:
-16.499 -13.864 (delta_t =   2.635 [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
Multiple GTIs in the spectrum
tstart tstop
-13.864000 154.480000
156.000000 419.040000
420.000000 499.960000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.69358     (     )
Norm@50keV  : 1.03676E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         156.59 using 59 PHA bins.
# Reduced chi-squared =         2.7473 for     57 degrees of freedom 
# Null hypothesis probability =   3.154577e-11
 
Photon flux (15-150 keV)    in 511.3 sec: 0.137386 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.91059e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-13.864000 154.480000
156.000000 419.040000
420.000000 499.960000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.24575     (     )
Epeak [keV] : 38.4466      (   )
Norm@50keV  : 0.296500    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         125.58 using 59 PHA bins.
# Reduced chi-squared =         2.2425 for     56 degrees of freedom 
# Null hypothesis probability =   2.968989e-07
 
Photon flux (15-150 keV)    in 511.3 sec: 0.120105 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.28802e-06 ( 0  0 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-13.864000 154.480000
156.000000 419.040000
420.000000 499.960000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.16521   ( -1.60349   -4.07021 )
beta        : -2.80774    ( -0.492802   0.373988 )
Epeak [keV] : 34.8712      ( -2.12474 1.93128 )
Norm@50keV   : 6.18980    ( -6.18996   13.2445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          98.54 using 59 PHA bins.
# Reduced chi-squared =          1.792 for     55 degrees of freedom 
# Null hypothesis probability =   2.840804e-04
 
Photon flux (15-150 keV)    in 511.3 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]    : 10.0460  (  )
R^2/D10^2   : 6.75239E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         127.88 using 59 PHA bins.
# Reduced chi-squared =         2.2436 for     57 degrees of freedom 
# Null hypothesis probability =   2.327183e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.107e-07   7.030e-08
25- 50  1.779e-06   1.232e-07
50-150  9.406e-07   1.664e-07
15-150  3.430e-06   2.531e-07
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 105.109       (      )
Norm        : 0.602481       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         148.69 using 59 PHA bins.
# Reduced chi-squared =         2.6086 for     57 degrees of freedom 
# Null hypothesis probability =   4.064731e-10
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.050e-07   8.155e-08
25- 50  1.406e-06   1.117e-07
50-150  2.342e-06   7.422e-07
15-150  4.553e-06   8.508e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.03925E-02        (      )
R1^2/D10^2  : 3.53524E+17        (      )
kT2 [keV]   : 10.0459        (      )
R2^2/D10^2  : 6.75243E-02    (   )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         127.88 using 59 PHA bins.
# Reduced chi-squared =         2.3252 for     55 degrees of freedom 
# Null hypothesis probability =   9.756558e-08
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Peak spectrum fit

Power-law model
Time interval is from  178.796 sec. to  179.796 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.46350     ( -0.695853   0.778114 )
Norm@50keV  : 4.14857E-03    ( -0.00185269   0.0017305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.87 using 59 PHA bins.
# Reduced chi-squared =         0.7520 for     57 degrees of freedom 
# Null hypothesis probability =   9.175008e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.512989 ( -0.19915  0.19915 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.96018e-08 ( -1.84058e-08  1.97105e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  178.796 sec. to  179.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.323642     ( -0.321702   1.78073 )
Epeak [keV] : 70.1391      ( -70.0963 -70.0963 )
Norm@50keV  : 1.63877E-02    ( -0.0164474   693.666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.58 using 59 PHA bins.
# Reduced chi-squared =         0.7604 for     56 degrees of freedom 
# Null hypothesis probability =   9.069206e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.491741 ( -0.227639  0.207528 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.61081e-08 ( -1.70072e-08  2.21775e-08 ) ergs/cm2
 
Band function
Time interval is from  178.796 sec. to  179.796 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.791390   ( 0.886921   5.73655 )
beta        : -9.45687    ( 9.99329   19.9933 )
Epeak [keV] : 86.0793      ( -52.6479 -86.0793 )
Norm@50keV   : 9.33164E-03    ( -0.00362076   0.00362076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.62 using 59 PHA bins.
# Reduced chi-squared =         0.7749 for     55 degrees of freedom 
# Null hypothesis probability =   8.883274e-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]    : 14.7617  (-4.86813  8.36376)
R^2/D10^2   : 6.57137E-02  (-0.0657137   0.190181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.84 using 59 PHA bins.
# Reduced chi-squared =         0.7516 for     57 degrees of freedom 
# Null hypothesis probability =   9.178902e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.006e-09   1.930e-09
25- 50  1.176e-08   7.725e-09
50-150  1.732e-08   1.270e-08
15-150  3.209e-08   1.993e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-199.363      -199.363)
Norm        : 2.09740       (-0.812207     0.812424)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.78 using 59 PHA bins.
# Reduced chi-squared =         0.7505 for     57 degrees of freedom 
# Null hypothesis probability =   9.190058e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.223e-09   3.428e-09
25- 50  1.005e-08   6.480e-09
50-150  2.203e-08   1.443e-08
15-150  3.730e-08   2.400e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.39292        (-2.3737      17.4735)
R1^2/D10^2  : 61.1433        (-87.2676      639.348)
kT2 [keV]   : 16.5233        (-5.74997      11.3484)
R2^2/D10^2  : 4.12372E-02    (-0.0421536   0.14226)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.31 using 59 PHA bins.
# Reduced chi-squared =         0.7511 for     55 degrees of freedom 
# Null hypothesis probability =   9.142431e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.736e-09   2.087e-09
25- 50  1.014e-08   6.110e-09
50-150  1.929e-08   1.196e-08
15-150  3.416e-08   2.052e-08
Plot creation:
Tue Apr 21 18:41:40 EDT 2015