batgrbproduct Analysis for Trigger=306778

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Mar 19 11:03:53 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger306778/GCN5_download_cron
======================================================================

  Trigger: 00306778      Segment: 000

  BAT Trigger Time: 227622359.616   [s; MET]
      Trigger Stop: 227622360.64   [s; MET]
               UTC: 2008-03-19T12:25:56.961660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 258.973352489113   Dec: 55.4098844023449  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.1
     Image Trigger?:     NO
     Rate S/N Ratio:     69.3613725354393  [ if not an image trigger ]
     Image S/N Ratio:    15.1

  Flight Position:   [ source = BAT ]
    RA: 258.973352489113   Dec: 55.4098844023449  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 259.005713768135   Dec: 55.3925071492988  [deg; J2000]  
        { 17h 16m 01.4s , +55d 23' 33.0" }
         +/- 0.952661519588548 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.313891420461837 [arcmin] (formal 1-sigma fit error)
    SNR: 32.5991338368315
    RA  =  17h 16m  1.4s  (259.005714 deg.)
    Dec =   55d 23' 33" (55.392507 deg.)
 
  Angular difference between Flight and Ground position is 1.517456 arcmin
 
  Partial Coding Fraction: 0.3046875    [ including projection effects ]

  Duration
     T90: 33.944000005722 +/- 8.88502944558435
        Measured from: 0.23199999332428
                   to: 34.1759999990463     [s; relative to TRIGTIME]
     T50: 7.71599999070168 +/- 0.501725039824458
        Measured from: 2.08000001311302
                   to: 9.7960000038147     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.127999991178513     
                   to: 1.12799999117851     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.328000009059906     
                   to: 51.2199999988079     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.196555   1.957533   1.652060   0.444676
           0.061939   0.065074   0.061356   0.055224 [error]
 Peak      0.133473   0.218079   0.229293   0.067826
           0.010841   0.013062   0.013726   0.011351 [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 4.12e-07 8.22e-07 1.27e-06 4.35e-06 3.56e-06 6.84e-06   erg/cm2
              Error 3.27e-08 3.77e-08 6.04e-08 4.77e-07 1.50e-07 5.14e-07   erg/cm2
Peak flux Power-law 1.28e+00 1.61e+00 1.48e+00 2.37e+00 5.18e+00 6.75e+00   ph/cm2/s
              Error 1.58e-01 1.21e-01 1.05e-01 3.60e-01 3.32e-01 4.54e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.83e-07 8.39e-07 1.31e-06 2.92e-06 3.50e-06 5.40e-06   erg/cm2
              Error 4.17e-08 4.19e-08 7.07e-08 8.01e-07 1.63e-07 7.82e-07   erg/cm2
Peak flux Cutoff-PL 1.20e+00 1.64e+00 1.53e+00 1.82e+00 5.14e+00 6.20e+00   ph/cm2/s
              Error 1.98e-01 1.33e-01 1.35e-01 7.19e-01 3.36e-01 7.92e-01   ph/cm2/s
 
Fluence        Band 3.80e-07 8.36e-07 1.31e-06 2.92e-06 3.50e-06 5.45e-06   erg/cm2
              Error 4.13e-08 4.19e-08 7.06e-08 8.73e-07 1.63e-07 1.12e-06   erg/cm2
Peak flux      Band 1.20e+00 1.64e+00 1.53e+00 1.82e+00 5.14e+00 6.20e+00   ph/cm2/s
              Error 2.46e-01 1.33e-01 1.35e-01 7.18e-01 3.38e-01 7.92e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.366    0.073    -      -           7.09e-03 2.77e-04   52.845 57
CPL   1.064    0.305     171.3  764.2      9.77e-03 3.05e-03   49.757  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.124    0.109    -      -           4.46e-02 2.78e-03   49.541 57
CPL   0.857    0.405     244.4 5000.0      5.90e-02 2.60e-02   48.396 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: 11.520000 sec.
T50 in the 50-300 keV band: 6.784000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   51.548   -0.328   51.220
T90    33.944    0.232   34.176
T50     7.716    2.080    9.796
Peak    1.000    0.128    1.128

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  259.0057 +55.3925 0.0059   33.7 -101.5       5.3456    32.6  TRIG_00306778       
------------------------------------------
 
Foreground time interval of the image:
 -0.328  51.220 (delta_t =  51.548 [sec])
Background time interval of the image:
-119.616  -0.328 (delta_t = 119.288 [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   -0.328 sec. to   51.220 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36604     ( -7.356572E-02   7.340026E-02) )
Norm@50keV  : 7.093390E-03    ( -2.770456E-04   2.770503E-04) )
------------------------------------------------------------
 Chi-Squared =      52.84520     using    59 PHA bins.
 Reduced chi-squared =     0.9271088     for     57 degrees of freedom
 Null hypothesis probability = 0.632
 
Photon flux (15-150 keV)    in 51.55 sec: 0.857420 ( -0.036144  0.036248 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55856e-06 ( -1.49278e-07  1.49964e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.328 sec. to   51.220 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06374     ( -0.318687   0.291426 )
Epeak [keV] : 171.303      ( -60.8394 1467.48 )
Norm@50keV  : 9.765879E-03    ( -2.292239E-03   3.804349E-03) )
------------------------------------------------------------
 Chi-Squared =      49.75720     using    59 PHA bins.
 but latest trial   1.35494     gives Chi-Squared =   3.21504
 but latest trial  7.217937E-03 gives Chi-Squared =   3.29064
 Reduced chi-squared =     0.8885214     for     56 degrees of freedom
 Null hypothesis probability = 0.709
 
Photon flux (15-150 keV)    in 51.55 sec: 0.842299 ( -0.038696  0.038922 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.49929e-06 ( -1.63867e-07  1.61821e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.328 sec. to   51.220 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.874326   ( -0.424198   2.26960 )
beta        : -1.53464    ( -8.46536   0.189266 )
Epeak [keV] : 109.574      ( -68.4700 3655.61 )
Norm@50keV   : 1.254231E-02    ( -5.235313E-03   4.07017 )
------------------------------------------------------------
 Chi-Squared =      49.58071     using    59 PHA bins.
 Reduced chi-squared =     0.9014675     for     55 degrees of freedom
 Null hypothesis probability = 0.681
 
Photon flux (15-150 keV)    in 51.55 sec: 0.838744 ( -0.039509  0.040534 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.49648e-06 ( -1.63548e-07  1.62094e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.128 sec. to    1.128 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12361     ( -0.109268   0.108538 )
Norm@50keV  : 4.457359E-02    ( -2.779640E-03   2.778471E-03) )
------------------------------------------------------------
 Chi-Squared =      49.54086     using    59 PHA bins.
 Reduced chi-squared =     0.8691379     for     57 degrees of freedom
 Null hypothesis probability = 0.748
 
Photon flux (15-150 keV)    in 1.000 sec: 5.18270 ( -0.33194  0.33224 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.62568e-07 ( -3.1933e-08  3.2045e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.128 sec. to    1.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.856761     ( -0.463390   0.345854 )
Epeak [keV] : 244.386      ( -244.376 9755.61 )
Norm@50keV  : 5.903245E-02    ( -1.636872E-02   3.556233E-02) )
------------------------------------------------------------
 Chi-Squared =      48.39562     using    59 PHA bins.
 Reduced chi-squared =     0.8642076     for     56 degrees of freedom
 Null hypothesis probability = 0.755
 
Photon flux (15-150 keV)    in 1.000 sec: 5.14466 ( -0.33752  0.33547 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.59106e-07 ( -3.3275e-08  3.2767e-08 ) ergs/cm2
 
Band function
Time interval is from    0.128 sec. to    1.128 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.863098   ( -0.339806   0.470761 )
beta        : -9.31204    ( -2.269745E-04   0.687720 )
Epeak [keV] : 254.693      ( -120.445 9755.57 )
Norm@50keV   : 5.832330E-02    ( -1.633480E-02   3.564968E-02) )
------------------------------------------------------------
 Chi-Squared =      48.40679     using    59 PHA bins.
 Reduced chi-squared =     0.8801235     for     55 degrees of freedom
 Null hypothesis probability = 0.723
 
Photon flux (15-150 keV)    in 1.000 sec: 5.14455 ( -0.33755  0.33754 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.58704e-07 ( -3.3158e-08  3.29e-08 ) ergs/cm2
 
Plot creation:
Wed Mar 19 11:09:45 EDT 2008