batgrbproduct Analysis for Trigger=250908

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  2 15:55:36 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger250908/GCN5_download_cron
======================================================================

  Trigger: 00250908      Segment: 000

  BAT Trigger Time: 187791415.036   [s; MET]
      Trigger Stop: 187791415.364   [s; MET]
               UTC: 2006-12-14T12:16:53.402800    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 4 ms to TRIGTIME + 320 ms

  BAT 
    RA: 7.7766114981453   Dec: -29.6401990420507  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.03
     Image Trigger?:     NO
     Rate S/N Ratio:     10.4880884817015  [ if not an image trigger ]
     Image S/N Ratio:    6.03

  Flight Position:   [ source = BAT ]
    RA: 7.7766114981453   Dec: -29.6401990420507  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 7.78711386423975   Dec: -29.6480067855972  [deg; J2000]  
        { 00h 31m 08.9s , -29d 38' 52.8" }
         +/- 90.4253083985773 [arcmin] (estimated 90% radius based on SNR)
         +/- 240.242783209637 [arcmin] (formal 1-sigma fit error)
    SNR: 0.0487998381892424
    RA  =   0h 31m  8.9s  (7.787114 deg.)
    Dec = -29d 38' 53" (-29.648007 deg.)
 
  Angular difference between Flight and Ground position is 0.720692 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 0.328000009059906 +/- 
        Measured from: 0
                   to: 0.328000009059906     [s; relative to TRIGTIME]
     T50: 0.328000009059906 +/- 
        Measured from: 0
                   to: 0.328000009059906     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 0.328000009059906 second)
        Measured from: 0     
                   to: 0.328000009059906     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.328000009059906     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    -0.000415  -0.000291  -0.001624   0.001272
           0.003379   0.003547   0.003183   0.002667 [error]
 Peak     -0.000415  -0.000291  -0.001624   0.001272
           0.003379   0.003547   0.003183   0.002667 [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 1.72e-12 2.22e-11 2.46e-10 2.07e-08 1.10e-09 0.00e+00   erg/cm2
              Error 5.87e-10 6.43e-10 1.19e-09 5.84e-08 3.52e-09 0.00e+00   erg/cm2
Peak flux Power-law 1.95e-04 1.07e-03 5.90e-03 1.52e-01 1.96e-02 0.00e+00   ph/cm2/s
              Error 5.99e-02 3.53e-02 3.07e-02 4.27e-01 1.05e-01 0.00e+00   ph/cm2/s
 
Fluence   Cutoff-PL 9.72e-13 1.97e-11 2.45e-10 2.49e-08 1.16e-09 0.00e+00   erg/cm2
              Error 5.85e-10 6.45e-10 1.19e-09 6.58e-08 3.52e-09 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.45e-04 9.50e-04 5.89e-03 1.81e-01 2.04e-02 0.00e+00   ph/cm2/s
              Error 5.96e-02 3.51e-02 3.07e-02 4.76e-01 1.04e-01 0.00e+00   ph/cm2/s
 
Fluence        Band 2.61e-13 1.09e-12 8.18e-11 1.54e-07 1.00e-09 0.00e+00   erg/cm2
              Error 5.69e-10 1.28e-09 2.38e-07 3.43e-09 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 1.92e-04 9.32e-05 2.57e-03 8.76e-01 1.49e-02 0.00e+00   ph/cm2/s
              Error 5.94e-02 3.29e-02 3.24e-02 2.48e+00 9.27e-02 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.500    6.500    -      -           0.00e+00 8.65e-04   52.247 57
CPL   1.000    6.500      50.0 5000.0      0.00e+00 5.00e+23   52.247 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.500    6.500    -      -           0.00e+00 8.65e-04   52.247 57
CPL   1.000    6.500      50.0 5000.0      0.00e+00 5.00e+23   52.247 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    0.328    0.000    0.328
T90     0.328    0.000    0.328
T50     0.328    0.000    0.328
Peak    0.328    0.000    0.328

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
    7.7871 -29.6480 3.9171   36.2  -25.1       0.0003     0.0  TRIG_00250908       
------------------------------------------
 
Foreground time interval of the image:
 -0.004   0.324 (delta_t =   0.328 [sec])
Background time interval of the image:
-60.040  -7.040 (delta_t =  53.000 [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   -0.004 sec. to    0.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50000     ( -4.50000   8.50000 )
Norm@50keV  : 0.00000    ( 0.00000   1.730650E-03) )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9166074     for     57 degrees of freedom
 Null hypothesis probability = 0.654
 
Photon flux (15-150 keV)    in 0.3280 sec: 1.956547E-02 ( -0.0195655  0.190091 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10312e-09 ( -1.10312e-09  5.94507e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.004 sec. to    0.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00000     ( -4.00000   9.00000 )
Epeak [keV] : 50.0000      ( -49.9900 9950.00 )
Norm@50keV  : 0.00000    ( 0.00000   1.000000E+24) )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9329754     for     56 degrees of freedom
 Null hypothesis probability = 0.618
 
Photon flux (15-150 keV)    in 0.3280 sec: 2.035987E-02 ( -0.0203599  0.188027 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16196e-09 ( -1.16196e-09  5.87343e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.004 sec. to    0.324 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.983950   ( -9.01605   5.98395 )
beta        : -2.50000    ( -7.50000   12.5000 )
Epeak [keV] : 80.0000      ( -79.9000 9920.00 )
Norm@50keV   : 0.00000    ( -1.644992E-02   113.823 )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9499386     for     55 degrees of freedom
 Null hypothesis probability = 0.580
 
Photon flux (15-150 keV)    in 0.3280 sec: 1.494947E-02 ( -0.0149495  0.170368 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00126e-09 ( -1.00126e-09  5.8546e-09 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.004 sec. to    0.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50000     ( -4.50000   8.50000 )
Norm@50keV  : 0.00000    ( 0.00000   1.730650E-03) )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9166074     for     57 degrees of freedom
 Null hypothesis probability = 0.654
 
Photon flux (15-150 keV)    in 0.3280 sec: 1.956547E-02 ( -0.0195655  0.190091 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10312e-09 ( -1.10312e-09  5.94507e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.004 sec. to    0.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00000     ( -4.00000   9.00000 )
Epeak [keV] : 50.0000      ( -49.9900 9950.00 )
Norm@50keV  : 0.00000    ( 0.00000   1.000000E+24) )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9329754     for     56 degrees of freedom
 Null hypothesis probability = 0.618
 
Photon flux (15-150 keV)    in 0.3280 sec: 2.035987E-02 ( -0.0203599  0.188027 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16196e-09 ( -1.16196e-09  5.87343e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.004 sec. to    0.324 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.983950   ( -9.01605   5.98395 )
beta        : -2.50000    ( -7.50000   12.5000 )
Epeak [keV] : 80.0000      ( -79.9000 9920.00 )
Norm@50keV   : 0.00000    ( -1.644992E-02   113.823 )
------------------------------------------------------------
 Chi-Squared =      52.24662     using    59 PHA bins.
 Reduced chi-squared =     0.9499386     for     55 degrees of freedom
 Null hypothesis probability = 0.580
 
Photon flux (15-150 keV)    in 0.3280 sec: 1.494947E-02 ( -0.0149495  0.170368 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00126e-09 ( -1.00126e-09  5.8546e-09 ) ergs/cm2
 
Plot creation:
Wed Jan  2 16:13:31 EST 2008