batgrbproduct Analysis for Trigger=340895

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.42
    Process Start Time (local time): Fri Jan 23 12:19:28 EST 2009
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger340895/GCN5_download_cron
======================================================================

  Trigger: 00340895      Segment: 000

  BAT Trigger Time: 254389920.768   [s; MET]
      Trigger Stop: 254389921.792   [s; MET]
               UTC: 2009-01-23T07:51:56.329040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.77522560443211   Dec: -23.5140158661529  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.15
     Image Trigger?:     NO
     Rate S/N Ratio:     7.93725393319377  [ if not an image trigger ]
     Image S/N Ratio:    7.15

  Flight Position:   [ source = BAT ]
    RA: 6.77522560443211   Dec: -23.5140158661529  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 6.79364992156489   Dec: -23.5034965453978  [deg; J2000]  
        { 00h 27m 10.5s , -23d 30' 12.6" }
         +/- 1.52378293645121 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.592057637234289 [arcmin] (formal 1-sigma fit error)
    SNR: 16.6647827809958
 
  Angular difference between Flight and Ground position is 1.194136 arcmin
 
  Partial Coding Fraction: 0.3632812    [ including projection effects ]

  Duration
     T90: 131.364000022411 +/- 22.9411767050796
        Measured from: -37.9799999296665
                   to: 93.3840000927448     [s; relative to TRIGTIME]
     T50: 38.0760000050068 +/- 12.8119514562773
        Measured from: -14.8759999275208
                   to: 23.200000077486     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0839999914169312     
                   to: 1.08399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -49.6280000209808     
                   to: 117.907999992371     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.408756   1.635366   1.114620   0.194372
           0.096080   0.096624   0.085702   0.074517 [error]
 Peak      0.050882   0.072477   0.050124   0.006927
           0.010261   0.010373   0.009565   0.007666 [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 4.94e-07 7.85e-07 9.39e-07 2.19e-06 2.85e-06 4.42e-06   erg/cm2
              Error 5.68e-08 5.40e-08 8.74e-08 4.38e-07 2.06e-07 5.05e-07   erg/cm2
Peak flux Power-law 6.44e-01 5.71e-01 3.47e-01 3.20e-01 1.70e+00 1.88e+00   ph/cm2/s
              Error 1.68e-01 9.73e-02 7.80e-02 1.40e-01 2.87e-01 3.14e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.93e-07 7.85e-07 9.40e-07 2.18e-06 2.85e-06 4.36e-06   erg/cm2
              Error 6.01e-08 5.49e-08 8.75e-08 7.28e-07 1.97e-07 6.30e-07   erg/cm2
Peak flux Cutoff-PL 5.73e-01 6.22e-01 3.66e-01 1.39e-01 1.66e+00 1.70e+00   ph/cm2/s
              Error 1.94e-01 1.24e-01 9.07e-02 2.10e-01 2.20e-01 3.56e-01   ph/cm2/s
 
Fluence        Band 4.83e-07 7.88e-07 9.39e-07 2.14e-06 2.84e-06 4.33e-06   erg/cm2
              Error 3.83e-08 6.54e-08 8.35e-08 4.32e-07 2.08e-07 3.82e-07   erg/cm2
Peak flux      Band 5.73e-01 6.23e-01 3.66e-01 1.38e-01 1.66e+00 1.70e+00   ph/cm2/s
              Error 1.94e-01 1.25e-01 9.06e-02 2.10e-01 2.94e-01 3.56e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.740    0.123    -      -           1.84e-03 1.28e-04   41.056 57
CPL   1.679    0.000     259.8    0.0      1.98e-03 1.03e-03   41.223  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.716    0.280    -      -           1.27e-02 2.27e-03   56.727 57
CPL   0.912    1.313      64.2 4985.2      3.39e-02 1.03e-01   55.246 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: 105.408000 sec.
T50 in the 50-300 keV band: 29.952000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  167.536  -49.628  117.908
T90   131.364  -37.980   93.384
T50    38.076  -14.876   23.200
Peak    1.000    0.084    1.084

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
    6.7936 -23.5035 0.0115   45.8 -158.2       3.1464    16.7  TRIG_00340895       
------------------------------------------
 
Foreground time interval of the image:
-49.628  11.033 (delta_t =  60.661 [sec])
Background time interval of the image:
-116.267 -81.398 (delta_t =  34.869 [sec])
-80.768 -49.628 (delta_t =  31.140 [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  -49.628 sec. to  117.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.74022     ( -0.122252   0.124369 )
Norm@50keV  : 1.843915E-03    ( -1.285243E-04   1.273877E-04) )
------------------------------------------------------------
 Chi-Squared =      41.05619     using    59 PHA bins.
 Reduced chi-squared =     0.7202840     for     57 degrees of freedom
 Null hypothesis probability = 0.945
 
Photon flux (15-150 keV)    in 167.5 sec: 0.248439 ( -0.017337  0.017408 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85179e-06 ( -2.05439e-07  2.05958e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -49.628 sec. to  117.908 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67868     (     )
Epeak [keV] : 259.797      (   )
Norm@50keV  : 1.981897E-03    ( -5.043451E-04   1.555491E-03) )
------------------------------------------------------------
 Chi-Squared =      41.22345     using    59 PHA bins.
 but latest trial  6.554784E-04 gives Chi-Squared =   3.08294
 Reduced chi-squared =     0.7361330     for     56 degrees of freedom
 Null hypothesis probability = 0.930
 
Photon flux (15-150 keV)    in 167.5 sec: 0.248332 ( -0.017329  0.017401 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85191e-06 ( -2.05204e-07  1.88052e-07 ) ergs/cm2
 
Band function
Time interval is from  -49.628 sec. to  117.908 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.49386   ( -8.50614   6.49386 )
beta        : -1.74021    ( -0.124477   0.122226 )
Epeak [keV] : 14.3492      ( -14.2492 985.324 )
Norm@50keV   : 3.831077E-03    ( -3.831077E-03   255.492 )
------------------------------------------------------------
 Chi-Squared =      41.05618     using    59 PHA bins.
 Reduced chi-squared =     0.7464761     for     55 degrees of freedom
 Null hypothesis probability = 0.919
 
Photon flux (15-150 keV)    in 167.5 sec: 0.248169 ( -0.016916  0.017613 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84281e-06 ( -2.03931e-07  2.1249e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.084 sec. to    1.084 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.71639     ( -0.273033   0.286733 )
Norm@50keV  : 1.271746E-02    ( -2.285127E-03   2.246286E-03) )
------------------------------------------------------------
 Chi-Squared =      56.72710     using    59 PHA bins.
 Reduced chi-squared =     0.9952122     for     57 degrees of freedom
 Null hypothesis probability = 0.485
 
Photon flux (15-150 keV)    in 1.000 sec: 1.69880 ( -0.28703  0.28764 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17643e-07 ( -2.17322e-08  2.199e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.084 sec. to    1.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.912481     ( -1.46955   1.15746 )
Epeak [keV] : 64.1944      ( -34.5133 9935.81 )
Norm@50keV  : 3.392347E-02    ( -3.392347E-02   0.171798 )
------------------------------------------------------------
 Chi-Squared =      55.24627     using    59 PHA bins.
 Reduced chi-squared =     0.9865405     for     56 degrees of freedom
 Null hypothesis probability = 0.503
 
Photon flux (15-150 keV)    in 1.000 sec: 1.65560 ( -0.29349  0.1475 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11564e-07 ( -2.31565e-08  2.3876e-08 ) ergs/cm2
 
Band function
Time interval is from    0.084 sec. to    1.084 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.909130   ( -9.09087   1.31218 )
beta        : -9.28465    ( -7.99159   0.454699 )
Epeak [keV] : 64.0772      ( -40.7895 394.883 )
Norm@50keV   : 3.407380E-02    ( -109.034   199.824 )
------------------------------------------------------------
 Chi-Squared =      55.24622     using    59 PHA bins.
 Reduced chi-squared =      1.004477     for     55 degrees of freedom
 Null hypothesis probability = 0.465
 
Photon flux (15-150 keV)    in 1.000 sec: 1.65525 ( -0.29312  0.29417 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13706e-07 ( -2.40764e-08  2.3819e-08 ) ergs/cm2
 
Plot creation:
Fri Jan 23 12:53:13 EST 2009