batgrbproduct Analysis for Trigger=351525

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.45
    Process Start Time (local time): Tue Aug 11 03:47:28 EDT 2009
             Host Name: gcn14
   Current Working Dir: /net/raid16/BAT_GRB_process_2009/351525
======================================================================

  Trigger: 00351525      Segment: 000

  BAT Trigger Time: 263538608.32   [s; MET]
      Trigger Stop: 263538616.512   [s; MET]
               UTC: 2009-05-09T05:10:03.594140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 241.403522652029   Dec: -28.4037305477642  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.05
     Image Trigger?:     NO
     Rate S/N Ratio:     16.0312195418814  [ if not an image trigger ]
     Image S/N Ratio:    7.05

  Flight Position:   [ source = BAT ]
    RA: 241.403522652029   Dec: -28.4037305477642  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 241.420847231876   Dec: -28.3841592300693  [deg; J2000]  
        { 16h 05m 41.0s , -28d 23' 03.0" }
         +/- 2.13324957519863 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.10385021608346 [arcmin] (formal 1-sigma fit error)
    SNR: 10.3052576531166
 
  Angular difference between Flight and Ground position is 1.488323 arcmin
 
  Partial Coding Fraction: 0.2929688    [ including projection effects ]

  Duration
     T90: 336.375999987125 +/- 33.2646390182625
        Measured from: -47.4639999866486
                   to: 288.912000000477     [s; relative to TRIGTIME]
     T50: 239.536000013351 +/- 12.1362869088005
        Measured from: 5.34400001168251
                   to: 244.880000025034     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 20.7319999933243     
                   to: 21.7319999933243     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -62.3959999978542     
                   to: 298.696000009775     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.599786   2.067371   1.339474   0.429650
           0.252699   0.210318   0.169595   0.147888 [error]
 Peak      0.032488   0.082620   0.051915   0.020225
           0.013423   0.012455   0.010920   0.008600 [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 5.48e-07 8.94e-07 1.10e-06 2.70e-06 3.31e-06 5.24e-06   erg/cm2
              Error 1.08e-07 1.07e-07 1.70e-07 8.99e-07 4.07e-07 1.03e-06   erg/cm2
Peak flux Power-law 4.57e-01 4.96e-01 3.83e-01 4.84e-01 1.52e+00 1.82e+00   ph/cm2/s
              Error 1.66e-01 1.12e-01 8.48e-02 2.25e-01 3.10e-01 3.52e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.18e-07 9.27e-07 1.12e-06 1.54e-06 3.21e-06 4.11e-06   erg/cm2
              Error 1.25e-07 1.28e-07 1.82e-07 1.75e-06 4.60e-07 1.60e-06   erg/cm2
Peak flux Cutoff-PL 4.21e-01 5.11e-01 3.98e-01 3.25e-01 1.49e+00 1.66e+00   ph/cm2/s
              Error 1.94e-01 1.26e-01 9.87e-02 3.59e-01 3.19e-01 4.60e-01   ph/cm2/s
 
Fluence        Band 4.99e-07 9.47e-07 1.07e-06 2.29e-06 3.24e-06 4.88e-06   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 3.70e-01 5.54e-01 3.83e-01 3.93e-01 1.47e+00 1.70e+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    1.695    0.207    -      -           9.90e-04 1.16e-04   61.630 57
CPL   1.332    0.841      88.5    0.0      1.52e-03 0.00e+00   60.960 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    1.373    0.334    -      -           1.25e-02 2.41e-03   48.810 57
CPL   0.991    0.000     140.0    0.0      1.92e-02 0.00e+00   48.530 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: 13.312000 sec.
T50 in the 50-300 keV band: 6.848000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  361.092  -62.396  298.696
T90   336.376  -47.464  288.912
T50   239.536    5.344  244.880
Peak    1.000   20.732   21.732

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  241.4208 -28.3842 0.0186   32.6   60.5       7.0565    10.3  TRIG_00351525       
------------------------------------------
 
Foreground time interval of the image:
-62.396 293.581 (delta_t = 355.977 [sec])
Background time interval of the image:
-239.320 -62.396 (delta_t = 176.924 [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  -62.396 sec. to  298.696 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.69533     ( -0.206285   0.207691 )
Norm@50keV  : 9.89507E-04    ( -0.000116703   0.000115853 )
------------------------------------------------------------
# Chi-Squared =          61.63 using 59 PHA bins.
# Reduced chi-squared =          1.081 for     57 degrees of freedom 
# Null hypothesis probability =   3.139606e-01
 
Photon flux (15-150 keV)    in 361.1 sec: 0.131204 ( -0.0157053  0.0157933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.30951e-06 ( -4.0471e-07  4.08679e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -62.396 sec. to  298.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33228     ( -0.886193   0.796161 )
Epeak [keV] : 88.5463      (   )
Norm@50keV  : 1.52474E-03    (     )
------------------------------------------------------------
# Chi-Squared =          60.96 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.022867e-01
 
Photon flux (15-150 keV)    in 361.1 sec: 0.128546 ( -0.016628  0.016665 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.20606e-06 ( -4.60045e-07  4.59214e-07 ) ergs/cm2
 
Band function
Time interval is from  -62.396 sec. to  298.696 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.35525   ( -3.71912   0.645214 )
beta        : -9.37148    ( 9.99999   20 )
Epeak [keV] : 93.6150      ( -39.9047 -93.4972 )
Norm@50keV   : 1.47093E-03    ( -0.000581783   0.00125006 )
------------------------------------------------------------
# Chi-Squared =          60.96 using 59 PHA bins.
# Reduced chi-squared =          1.108 for     55 degrees of freedom 
# Null hypothesis probability =   2.701249e-01
 
Photon flux (15-150 keV)    in 361.1 sec: 0.128545 ( -0.016626  0.016667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.23716e-06 ( -4.09347e-07  4.0388e-07 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     

Peak spectrum fit

Power-law model
Time interval is from   20.732 sec. to   21.732 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37335     ( -0.336719   0.330291 )
Norm@50keV  : 1.25270E-02    ( -0.00240906   0.002409 )
------------------------------------------------------------
# Chi-Squared =          48.81 using 59 PHA bins.
# Reduced chi-squared =         0.8563 for     57 degrees of freedom 
# Null hypothesis probability =   7.715605e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.51657 ( -0.308497  0.310963 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21723e-07 ( -2.48633e-08  2.50763e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   20.732 sec. to   21.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.990562     (     )
Epeak [keV] : 139.985      (   )
Norm@50keV  : 1.91675E-02    (     )
------------------------------------------------------------
# Chi-Squared =          48.53 using 59 PHA bins.
# Reduced chi-squared =         0.8666 for     56 degrees of freedom 
# Null hypothesis probability =   7.505828e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.49242 ( -0.31744  0.31975 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.19173e-07 ( -2.72741e-08  2.6412e-08 ) ergs/cm2
 
Band function
Time interval is from   20.732 sec. to   21.732 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.872558   ( -0.193837   -0.193837 )
beta        : -1.58905    ( 1.57547   0.478277 )
Epeak [keV] : 45.3219      ( -45.0976 163.776 )
Norm@50keV   : 0.295062    ( -0.331469   165.397 )
------------------------------------------------------------
# Chi-Squared =          47.85 using 59 PHA bins.
# Reduced chi-squared =         0.8700 for     55 degrees of freedom 
# Null hypothesis probability =   7.420022e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.46614 ( -0.32512  0.16307 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.19047e-07 ( -2.72035e-08  2.6427e-08 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Plot creation:
Fri May 27 11:32:34 EDT 2011