batgrbproduct Analysis for Trigger=451757

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sat May  7 15:17:13 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger451757/SDC
======================================================================

  Trigger: 00451757      Segment: 000

  BAT Trigger Time: 324990150.912   [s; MET]
      Trigger Stop: 324990151.936   [s; MET]
               UTC: 2011-04-20T11:02:24.037860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 2.16510709260475   Dec: -37.8550292612526  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.93
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6491106406735  [ if not an image trigger ]
     Image S/N Ratio:    7.93

  Flight Position:   [ source = BAT ]
    RA: 2.16510709260475   Dec: -37.8550292612526  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 2.16423302856111   Dec: -37.8769773099224  [deg; J2000]  
        { 00h 08m 39.4s , -37d 52' 37.1" }
         +/- 0.848945964384747 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.326646262569424 [arcmin] (formal 1-sigma fit error)
    SNR: 38.4342411884367
 
  Angular difference between Flight and Ground position is 1.317534 arcmin
 
  Partial Coding Fraction: 0.1503906    [ including projection effects ]

  Duration
     T90: 13.8039999604225 +/- 1.33804779251485
        Measured from: 1.43599998950958
                   to: 15.2399999499321     [s; relative to TRIGTIME]
     T50: 4.69199997186661 +/- 0.398577501224954
        Measured from: 5.96399998664856
                   to: 10.6559999585152     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.04399996995926     
                   to: 9.04399996995926     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.103999972343445     
                   to: 21.8159999847412     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.181681   3.948625   1.946505   0.289950
           0.096592   0.094113   0.076731   0.056530 [error]
 Peak      0.455986   0.502115   0.375951   0.075061
           0.027156   0.028502   0.023832   0.015543 [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 1.78e-06 1.99e-06 1.58e-06 2.09e-06 6.12e-06 7.44e-06   erg/cm2
              Error 1.03e-07 6.61e-08 8.21e-08 2.29e-07 2.01e-07 3.05e-07   erg/cm2
Peak flux Power-law 5.88e+00 4.69e+00 2.53e+00 1.98e+00 1.40e+01 1.51e+01   ph/cm2/s
              Error 6.09e-01 3.00e-01 2.04e-01 3.21e-01 9.16e-01 9.24e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.71e-06 2.02e-06 1.60e-06 1.58e-06 6.02e-06 6.90e-06   erg/cm2
              Error 1.33e-07 7.57e-08 8.55e-08 5.52e-07 2.36e-07 6.31e-07   erg/cm2
Peak flux Cutoff-PL 5.69e+00 4.75e+00 2.57e+00 1.70e+00 1.39e+01 1.47e+01   ph/cm2/s
              Error 7.53e-01 3.38e-01 2.35e-01 5.70e-01 9.64e-01 1.20e+00   ph/cm2/s
 
Fluence        Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.326    0.068    -      -           2.91e-02 1.08e-03   49.820 57
CPL   1.987    0.000       2.0    8.6      4.28e-02 3.09e-03   48.630 56
 
The chi2 of BB fit is  which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.893    0.108    -      -           9.78e-02 6.22e-03   41.080 57
CPL   1.737    0.517      88.5    0.0      1.17e-01 0.00e+00   40.650 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: 9.728000 sec.
T50 in the 50-300 keV band: 3.200000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   21.920   -0.104   21.816
T90    13.804    1.436   15.240
T50     4.692    5.964   10.656
Peak    1.000    8.044    9.044

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
    2.1642 -37.8770 0.0050   50.2  -34.1       8.6136    38.4  TRIG_00451757       
------------------------------------------
 
Foreground time interval of the image:
 -0.104  10.989 (delta_t =  11.093 [sec])
Background time interval of the image:
-239.912  -0.104 (delta_t = 239.808 [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   -0.104 sec. to   21.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.32611     ( -0.0676204   0.0688558 )
Norm@50keV  : 2.90847E-02    ( -0.00107967   0.00107234 )
------------------------------------------------------------
# Chi-Squared =          49.82 using 59 PHA bins.
# Reduced chi-squared =         0.8740 for     57 degrees of freedom 
# Null hypothesis probability =   7.389013e-01
 
Photon flux (15-150 keV)    in 21.92 sec: 5.15770 ( -0.19876  0.200346 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.12267e-06 ( -2.00968e-07  2.01096e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.104 sec. to   21.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98674     (     )
Epeak [keV] : 1.95101      ( -0.357292 16.8777 )
Norm@50keV  : 4.27620E-02    ( -0.0029999   0.00318107 )
------------------------------------------------------------
# Chi-Squared =          48.63 using 59 PHA bins.
# Reduced chi-squared =         0.8684 for     56 degrees of freedom 
# Null hypothesis probability =   7.472575e-01
 
Photon flux (15-150 keV)    in 21.92 sec: 5.05579 ( -0.23205  0.23455 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.02493e-06 ( -2.36363e-07  2.35618e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.104 sec. to   21.816 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.98338   ( 1.94836   0.0284401 )
beta        : -10.00000    ( 9.74209e+10   9.74209e+10 )
Epeak [keV] : 2.41962      ( -0.485629 16.5167 )
Norm@50keV   : 4.29180E-02    ( -0.00139699   0.00139704 )
------------------------------------------------------------
# Chi-Squared =          48.66 using 59 PHA bins.
# Reduced chi-squared =         0.8848 for     55 degrees of freedom 
# Null hypothesis probability =   7.139765e-01
 
Photon flux (15-150 keV)    in 21.92 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     

Peak spectrum fit

Power-law model
Time interval is from    8.044 sec. to    9.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.89328     ( -0.106792   0.109268 )
Norm@50keV  : 9.77924E-02    ( -0.00623497   0.00619592 )
------------------------------------------------------------
# Chi-Squared =          41.08 using 59 PHA bins.
# Reduced chi-squared =         0.7208 for     57 degrees of freedom 
# Null hypothesis probability =   9.444749e-01
 
Photon flux (15-150 keV)    in 1 sec: 13.9943 ( -0.913863  0.918579 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.9903e-07 ( -5.68999e-08  5.70398e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    8.044 sec. to    9.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73658     ( -0.430875   0.602415 )
Epeak [keV] : 88.5404      (   )
Norm@50keV  : 0.116647    (     )
------------------------------------------------------------
# Chi-Squared =          40.65 using 59 PHA bins.
# Reduced chi-squared =         0.7259 for     56 degrees of freedom 
# Null hypothesis probability =   9.387883e-01
 
Photon flux (15-150 keV)    in 1 sec: 13.8692 ( -0.9631  0.9643 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.93854e-07 ( -5.8919e-08  5.8778e-08 ) ergs/cm2
 
Band function
Time interval is from    8.044 sec. to    9.044 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.73658   ( 1.74625   0.21694 )
beta        : -10.00000    ( 2.2487e+13   2.2487e+13 )
Epeak [keV] : 88.5268      ( -28.3286 -88.5268 )
Norm@50keV   : 0.116620    ( -0.0245158   0.0704029 )
------------------------------------------------------------
# Chi-Squared =          40.65 using 59 PHA bins.
# Reduced chi-squared =         0.7391 for     55 degrees of freedom 
# Null hypothesis probability =   9.256730e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Plot creation:
Sat May  7 16:26:36 EDT 2011