batgrbproduct Analysis for Trigger=271019

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Dec 13 15:32:49 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger271019/GCN5_download_cron
======================================================================

  Trigger: 00271019      Segment: 000

  BAT Trigger Time: 195895737.92   [s; MET]
      Trigger Stop: 195895738.432   [s; MET]
               UTC: 2007-03-18T07:28:56.088640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 48.5402261665742   Dec: -42.961988565526  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.03
     Image Trigger?:     NO
     Rate S/N Ratio:     17.9443584449264  [ if not an image trigger ]
     Image S/N Ratio:    10.03

  Flight Position:   [ source = BAT ]
    RA: 48.5402261665742   Dec: -42.961988565526  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 48.4852330819327   Dec: -42.9447556847306  [deg; J2000]  
        { 03h 13m 56.5s , -42d 56' 41.1" }
         +/- 0.778505671218729 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.240612646042198 [arcmin] (formal 1-sigma fit error)
    SNR: 43.4969387826544
    RA  =   3h 13m 56.5s  (48.485233 deg.)
    Dec = -42d 56' 41" (-42.944756 deg.)
 
  Angular difference between Flight and Ground position is 2.627032 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 108 +/- 28
        Measured from: 0.0800000131130219
                   to: 108.080000013113     [s; relative to TRIGTIME]
     T50: 32 +/- 4
        Measured from: 4.08000001311302
                   to: 36.080000013113     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.08000001311302     
                   to: 2.08000001311302     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.919999986886978     
                   to: 147.080000013113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.098175   1.508735   1.178173   0.304580
           0.057296   0.058722   0.053044   0.047819 [error]
 Peak      0.050359   0.076847   0.060454   0.014393
           0.005775   0.006384   0.005920   0.004746 [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 3.25e-07 6.26e-07 9.35e-07 3.01e-06 2.63e-06 4.90e-06   erg/cm2
              Error 2.93e-08 3.22e-08 5.41e-08 4.03e-07 1.31e-07 4.34e-07   erg/cm2
Peak flux Power-law 4.85e-01 5.35e-01 4.22e-01 5.48e-01 1.65e+00 1.99e+00   ph/cm2/s
              Error 7.92e-02 5.40e-02 4.78e-02 1.28e-01 1.53e-01 1.91e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.18e-07 6.30e-07 9.43e-07 2.64e-06 2.62e-06 4.36e-06   erg/cm2
              Error 3.53e-08 2.67e-08 4.64e-08 8.57e-07 1.41e-07 8.75e-07   erg/cm2
Peak flux Cutoff-PL 4.30e-01 5.65e-01 4.49e-01 3.02e-01 1.61e+00 1.75e+00   ph/cm2/s
              Error 9.55e-02 6.37e-02 5.72e-02 1.96e-01 1.57e-01 2.49e-01   ph/cm2/s
 
Fluence        Band 3.18e-07 6.29e-07 9.31e-07 2.97e-06 2.63e-06 4.82e-06   erg/cm2
              Error 3.03e-08 3.69e-08 3.60e-08 7.69e-07 1.36e-07 4.65e-07   erg/cm2
Peak flux      Band 4.30e-01 5.64e-01 4.49e-01 3.02e-01 1.61e+00 1.75e+00   ph/cm2/s
              Error 9.56e-02 6.38e-02 5.72e-02 1.97e-01 1.57e-01 2.50e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.421    0.088    -      -           1.85e-03 8.39e-05   39.080 57
CPL   1.262    0.261     249.7    0.0      2.19e-03 0.00e+00   38.994 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.344    0.158    -      -           1.37e-02 1.27e-03   54.940 57
CPL   0.744    0.657     109.9 1145.1      2.69e-02 2.20e-02   52.078 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: 73.664000 sec.
T50 in the 50-300 keV band: 23.040000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  148.000   -0.920  147.080
T90   108.000    0.080  108.080
T50    32.000    4.080   36.080
Peak    1.000    1.080    2.080

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   48.4852 -42.9448 0.0044   21.6  -57.3       1.6212    43.5  TRIG_00271019       
------------------------------------------
 
Foreground time interval of the image:
 -0.920   8.481 (delta_t =   9.401 [sec])
Background time interval of the image:
-113.719  -0.920 (delta_t = 112.799 [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   -0.920 sec. to  147.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42091     ( -8.767593E-02   8.758378E-02) )
Norm@50keV  : 1.849647E-03    ( -8.389156E-05   8.383754E-05) )
------------------------------------------------------------
 Chi-Squared =      39.07956     using    59 PHA bins.
 Reduced chi-squared =     0.6856063     for     57 degrees of freedom
 Null hypothesis probability = 0.966
 
Photon flux (15-150 keV)    in 148.0 sec: 0.226344 ( -0.010895  0.01094 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.63394e-06 ( -1.30595e-07  1.3175e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.920 sec. to  147.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26244     ( -0.279490   0.242220 )
Epeak [keV] : 249.669      (   )
Norm@50keV  : 2.188858E-03    (     )
------------------------------------------------------------
 Chi-Squared =      38.99354     using    59 PHA bins.
 Reduced chi-squared =     0.6963132     for     56 degrees of freedom
 Null hypothesis probability = 0.959
 
Photon flux (15-150 keV)    in 148.0 sec: 0.225070 ( -0.011473  0.011675 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.61901e-06 ( -1.42169e-07  1.40289e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.920 sec. to  147.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.01118   ( -10.1488   1.89162 )
beta        : -1.43231    ( -0.104635   0.102655 )
Epeak [keV] : 66.3235      ( -34.1963 905.001 )
Norm@50keV   : 3.597056E-03    ( -24.4611   136.155 )
------------------------------------------------------------
 Chi-Squared =      38.79401     using    59 PHA bins.
 Reduced chi-squared =     0.7053457     for     55 degrees of freedom
 Null hypothesis probability = 0.952
 
Photon flux (15-150 keV)    in 148.0 sec: 0.225072 ( -0.011714  0.011672 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.62839e-06 ( -1.42509e-07  1.28834e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.34431     ( -0.157358   0.158052 )
Norm@50keV  : 1.367878E-02    ( -1.270220E-03   1.267384E-03) )
------------------------------------------------------------
 Chi-Squared =      54.94037     using    59 PHA bins.
 Reduced chi-squared =     0.9638662     for     57 degrees of freedom
 Null hypothesis probability = 0.553
 
Photon flux (15-150 keV)    in 1.000 sec: 1.64599 ( -0.15337  0.15352 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.33779e-07 ( -1.39e-08  1.402e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.080 sec. to    2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.744129     ( -0.708599   0.606364 )
Epeak [keV] : 109.922      ( -34.7777 2255.41 )
Norm@50keV  : 2.686468E-02    ( -1.296205E-02   3.112266E-02) )
------------------------------------------------------------
 Chi-Squared =      52.07837     using    59 PHA bins.
 Reduced chi-squared =     0.9299709     for     56 degrees of freedom
 Null hypothesis probability = 0.624
 
Photon flux (15-150 keV)    in 1.000 sec: 1.61278 ( -0.15762  0.15706 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29581e-07 ( -1.4858e-08  1.4833e-08 ) ergs/cm2
 
Band function
Time interval is from    1.080 sec. to    2.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.744632   ( -0.606264   0.709146 )
beta        : -8.57539    ( -1.42461   4.87098 )
Epeak [keV] : 109.951      ( -34.8255 2271.59 )
Norm@50keV   : 2.684854E-02    ( -1.294842E-02   3.115252E-02) )
------------------------------------------------------------
 Chi-Squared =      52.07849     using    59 PHA bins.
 Reduced chi-squared =     0.9468816     for     55 degrees of freedom
 Null hypothesis probability = 0.587
 
Photon flux (15-150 keV)    in 1.000 sec: 1.61284 ( -0.15763  0.15726 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29518e-07 ( -1.4869e-08  1.4816e-08 ) ergs/cm2
 
Plot creation:
Thu Dec 13 15:58:22 EST 2007