batgrbproduct Analysis for Trigger=310785

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun May  4 02:44:15 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger310785/GCN5_download_cron
======================================================================

  Trigger: 00310785      Segment: 000

  BAT Trigger Time: 231510376.192   [s; MET]
      Trigger Stop: 231510376.256   [s; MET]
               UTC: 2008-05-03T12:26:13.429140    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 286.617169964645   Dec: 68.7780078042036  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.79
     Image Trigger?:     NO
     Rate S/N Ratio:     20.1990098767242  [ if not an image trigger ]
     Image S/N Ratio:    8.79

  Flight Position:   [ source = BAT ]
    RA: 286.617169964645   Dec: 68.7780078042036  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 286.67783912342   Dec: 68.8014271042547  [deg; J2000]  
        { 19h 06m 42.7s , +68d 48' 05.1" }
         +/- 3.41819016841596 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.98978578401 [arcmin] (formal 1-sigma fit error)
    SNR: 5.25475352765913
    RA  =  19h  6m 42.7s  (286.677839 deg.)
    Dec =   68d 48'  5" (68.801427 deg.)
 
  Angular difference between Flight and Ground position is 1.925849 arcmin
 
  Partial Coding Fraction: 0.7578125    [ including projection effects ]

  Duration
     T90: 167.252000033855 +/- 42.946280877151
        Measured from: 10.447999984026
                   to: 177.700000017881     [s; relative to TRIGTIME]
     T50: 50.108000010252 +/- 9.79021307068405
        Measured from: 29.1839999854565
                   to: 79.2919999957085     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 26.6119999885559     
                   to: 27.6119999885559     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0480000078678131     
                   to: 231.535999983549     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.382794   1.400214   0.731052   0.218263
           0.075777   0.075799   0.067314   0.059985 [error]
 Peak      0.043236   0.041384   0.017152   0.007203
           0.005675   0.005723   0.005109   0.004445 [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 4.49e-07 6.07e-07 6.04e-07 1.08e-06 2.01e-06 2.74e-06   erg/cm2
              Error 4.74e-08 4.00e-08 6.64e-08 2.46e-07 1.50e-07 3.08e-07   erg/cm2
Peak flux Power-law 3.88e-01 2.98e-01 1.53e-01 1.13e-01 8.90e-01 9.51e-01   ph/cm2/s
              Error 8.81e-02 4.87e-02 4.06e-02 5.65e-02 1.45e-01 1.58e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.34e-07 6.24e-07 6.04e-07 6.97e-07 1.96e-06 2.36e-06   erg/cm2
              Error 5.50e-08 5.09e-08 6.97e-08 4.86e-07 1.73e-07 5.34e-07   erg/cm2
Peak flux Cutoff-PL 3.57e-01 3.42e-01 1.44e-01 2.56e-02 8.65e-01 8.69e-01   ph/cm2/s
              Error 1.00e-01 7.15e-02 5.23e-02 6.81e-02 1.48e-01 1.56e-01   ph/cm2/s
 
Fluence        Band 4.29e-07 6.22e-07 6.01e-07 7.99e-07 1.96e-06 2.43e-06   erg/cm2
              Error 5.33e-08 4.83e-08 7.16e-08 3.38e-07 1.72e-07 4.51e-07   erg/cm2
Peak flux      Band 3.61e-01 3.38e-01 1.43e-01 4.34e-02 8.69e-01 9.00e-01   ph/cm2/s
              Error 1.03e-01 7.03e-02 5.13e-02 5.67e-02 1.46e-01 1.62e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.006    0.132    -      -           9.41e-04 7.38e-05   60.906 57
CPL   1.748    0.460      43.9 4999.2      1.30e-03 8.96e-04   60.094  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.963    0.294    -      -           6.04e-03 1.23e-03   75.554 57
CPL   0.795    1.587      41.0 5000.0      3.02e-02 2.00e-01   73.343 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: 67.264000 sec.
T50 in the 50-300 keV band: 33.856000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  231.584   -0.048  231.536
T90   167.252   10.448  177.700
T50    50.108   29.184   79.292
Peak    1.000   26.612   27.612

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  286.6778 +68.8014 0.0368   32.3   -6.8       0.1824     5.3  TRIG_00310785       
------------------------------------------
 
Foreground time interval of the image:
 -0.048  10.409 (delta_t =  10.457 [sec])
Background time interval of the image:
-239.192  -0.048 (delta_t = 239.144 [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   -0.048 sec. to  231.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.00650     ( -0.130461   0.134068 )
Norm@50keV  : 9.413347E-04    ( -7.433892E-05   7.321173E-05) )
------------------------------------------------------------
 Chi-Squared =      60.90557     using    59 PHA bins.
 Reduced chi-squared =      1.068519     for     57 degrees of freedom
 Null hypothesis probability = 0.337
 
Photon flux (15-150 keV)    in 231.6 sec: 0.141624 ( -0.009665  0.009687 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.01117e-06 ( -1.49259e-07  1.50783e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.048 sec. to  231.536 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.74837     ( -0.553464   0.365775 )
Epeak [keV] : 43.9140      ( -42.2407 9956.09 )
Norm@50keV  : 1.300608E-03    ( -5.238078E-04   1.267241E-03) )
------------------------------------------------------------
 Chi-Squared =      60.09415     using    59 PHA bins.
 but latest trial   2.08896     gives Chi-Squared =   1.34307
 but latest trial  7.022442E-04 gives Chi-Squared =   27.4092
 Reduced chi-squared =      1.073110     for     56 degrees of freedom
 Null hypothesis probability = 0.330
 
Photon flux (15-150 keV)    in 231.6 sec: 0.139564 ( -0.010382  0.01031 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96324e-06 ( -1.73517e-07  1.72382e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.048 sec. to  231.536 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.46942   ( -8.53058   2.50055 )
beta        : -2.03401    ( -7.48306   0.619723 )
Epeak [keV] : 28.5085      ( -43.8742 367.044 )
Norm@50keV   : 2.211531E-03    ( -4.779229E-04   66.2823 )
------------------------------------------------------------
 Chi-Squared =      60.67352     using    59 PHA bins.
 Reduced chi-squared =      1.103155     for     55 degrees of freedom
 Null hypothesis probability = 0.279
 
Photon flux (15-150 keV)    in 231.6 sec: 0.139495 ( -0.009784  0.010385 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.95889e-06 ( -1.68058e-07  1.75743e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   26.612 sec. to   27.612 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.96281     ( -0.282960   0.304590 )
Norm@50keV  : 6.036251E-03    ( -1.250981E-03   1.216671E-03) )
------------------------------------------------------------
 Chi-Squared =      75.55443     using    59 PHA bins.
 Reduced chi-squared =      1.325516     for     57 degrees of freedom
 Null hypothesis probability = 5.056E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 0.890325 ( -0.145483  0.145495 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.55325e-08 ( -1.07723e-08  1.12036e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   26.612 sec. to   27.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.794925     ( -1.86302   1.31051 )
Epeak [keV] : 41.0083      ( -40.9983 9958.99 )
Norm@50keV  : 3.015079E-02    ( -3.015079E-02   0.368857 )
------------------------------------------------------------
 Chi-Squared =      73.34299     using    59 PHA bins.
 Reduced chi-squared =      1.309696     for     56 degrees of freedom
 Null hypothesis probability = 5.981E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 0.864617 ( -0.148166  0.148283 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.97329e-08 ( -1.09841e-08  1.27662e-08 ) ergs/cm2
 
Band function
Time interval is from   26.612 sec. to   27.612 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.849403   ( -9.15060   2.39767 )
beta        : -4.06765    ( -5.93235   13.7761 )
Epeak [keV] : 41.4365      ( -41.3365 125.252 )
Norm@50keV   : 2.776191E-02    ( -804.770   340.473 )
------------------------------------------------------------
 Chi-Squared =      73.32513     using    59 PHA bins.
 Reduced chi-squared =      1.333184     for     55 degrees of freedom
 Null hypothesis probability = 4.989E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 0.869094 ( -0.146211  0.145836 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.13209e-08 ( -9.4862e-09  1.24867e-08 ) ergs/cm2
 
Plot creation:
Mon May  5 22:36:24 EDT 2008