Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 05:55:21 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger295670
======================================================================

  Trigger: 00295670      Segment: 000

  BAT Trigger Time: 215485599.296   [s; MET]
      Trigger Stop: 215485603.392   [s; MET]
               UTC: 2007-10-31T01:06:36.967720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.45831176275914   Dec: -58.0454373126827  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.48
     Image Trigger?:     NO
     Rate S/N Ratio:     8.71779788708135  [ if not an image trigger ]
     Image S/N Ratio:    9.48

  Analysis Position:   [ source = BAT ]
    RA: 6.45831176275914   Dec: -58.0454373126827  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 6.39556426309878   Dec: -58.0521229914089  [deg; J2000]  
        { 00h 25m 34.9s , -58d 03' 07.6" }
         +/- 1.84002580802787 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.900274171380138 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7291235625573
 
  Angular difference between the analysis and refined position is 2.032329 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 180.643999993801 +/- 30.3420000084132
        Measured from: -1.12799999117851
                   to: 179.516000002623     [s; relative to TRIGTIME]
     T50: 114.236000001431 +/- 13.8757532464854
        Measured from: 7.24799999594688
                   to: 121.483999997377     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.55599999427795     
                   to: 3.55599999427795     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.53200000524521     
                   to: 192.479999989271     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.896535   0.625673   0.320062   0.237384
           0.068208   0.070523   0.062548   0.055764 [error]
 Peak      0.023635   0.022364   0.011461   0.010572
           0.005493   0.005779   0.005069   0.004362 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  197.012   -4.532  192.480
T90   180.644   -1.128  179.516
T50   114.236    7.248  121.484
Peak    1.000    2.556    3.556
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.355    -0.277      0.252       -           -               -         4.72e-04     -8.81e-05          8.58e-05      58.890   57
CPL     -1.985    -0.014      0.289        2.079     214.980       375.671      7.22e-04     -5.95e-04          -2.67e-04      61.620   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.064     -0.676     0.549       -           -               -         3.48e-03     -1.44e-03          1.29e-03      36.660   57
CPL     -2.019      N/A       N/A          62.954      N/A           N/A         3.52e-03        N/A               N/A         36.660   56
 
 
=== 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         PL   2.67e-07  2.93e-07  2.29e-07  2.94e-07  8.98e-07  1.08e-06   erg/cm2
      90%_error_low -3.87e-08 -3.59e-08 -5.74e-08 -1.22e-07 -1.26e-07 -2.01e-07   erg/cm2
      90%_error_hi   3.92e-08  3.48e-08  6.14e-08  1.74e-07  1.32e-07  2.41e-07   erg/cm2
Peak flux       PL   2.47e-01  1.78e-01  8.52e-02  5.75e-02  5.38e-01  5.68e-01   ph/cm2/s
      90%_error_low -9.02e-02 -4.92e-02 -4.36e-02 -4.14e-02 -1.39e-01 -1.52e-01   ph/cm2/s
      90%_error_hi   9.32e-02  4.73e-02  4.59e-02  7.95e-02  1.39e-01  1.54e-01   ph/cm2/s
 
Fluence        CPL   2.59e-07  2.11e-07  1.23e-07  1.33e-07  6.43e-07  7.26e-07   erg/cm2
      90%_error_low -4.04e-08 -6.98e-08 -6.82e-08 -9.76e-08 -1.89e-07 -2.50e-07   erg/cm2
      90%_error_hi   4.04e-08  9.06e-08  1.30e-07  3.02e-07  3.11e-07  5.18e-07   erg/cm2
Peak flux      CPL   2.28e-01  9.65e-02  4.07e-02  9.98e-03  3.98e-01  4.14e-01   ph/cm2/s
      90%_error_low -1.00e-01 -9.65e-02 -4.07e-02 -9.98e-03     N/A       N/A     ph/cm2/s
      90%_error_hi   1.00e-01  1.13e-01  6.81e-02  7.84e-02     N/A       N/A     ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    6.3956   -58.0521   0.0151    27.7133  -139.7044         1.0136503     12.729 TRIG_00295670                 
 
Foreground time interval of the image:
 -4.532  43.605 (delta_t =  48.137 [sec])
Background time interval of the image:
-239.296  -4.532 (delta_t = 234.764 [sec])




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -4.532 sec. to  192.480 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.35491     ( -0.276665   0.251937 )
Norm@50keV  : 4.71734E-04    ( -8.81305e-05   8.57736e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.89 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     57 degrees of freedom 
# Null hypothesis probability =   4.060708e-01
 
Photon flux (15-150 keV)    in 197 sec: 8.50443E-02 ( -0.0090669  0.0090669 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.97875e-07 ( -1.25983e-07  1.31554e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.532 sec. to  192.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.94308     ( -0.00554501   0.297825 )
Epeak [keV] : 297.745      ( -80.6801 80.0106 )
Norm@50keV  : 2.44785E-04    ( -0.000118383   0.000209293 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.89 using 59 PHA bins.
# Reduced chi-squared =         0.9981 for     56 degrees of freedom 
# Null hypothesis probability =   4.789232e-01
 
Photon flux (15-150 keV)    in 197 sec: 7.07226E-02 ( -0.0141034  0.0180338 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.43408e-07 ( -1.88706e-07  3.1061e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.556 sec. to    3.556 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.06449     ( -0.675484   0.549623 )
Norm@50keV  : 3.47591E-03    ( -0.00143837   0.00128796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.66 using 59 PHA bins.
# Reduced chi-squared =         0.6432 for     57 degrees of freedom 
# Null hypothesis probability =   9.834149e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.537501 ( -0.139242  0.139233 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.21951e-08 ( -1.10466e-08  1.17854e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.556 sec. to    3.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.01936     (       )
Epeak [keV] : 62.9544      (   )
Norm@50keV  : 3.51517E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.66 using 59 PHA bins.
# Reduced chi-squared =         0.6546 for     56 degrees of freedom 
# Null hypothesis probability =   9.787831e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.397821 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 180.644 sec.
Hardness ratio (energy fluence ratio) = 0.781933248946

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = 5.591997e-07
S(50-150 keV) = 3.386621e-07

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = -4.006616742400414E-01, IMY = 3.397329664709020E-01

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band 

    Time interval of the image:
-239.296000 -4.532000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 20.1528  -8.7342    2.6  33.3  106.5   1.3692   4.5 ------	UNKNOWN                       
307.6485  -6.9455    2.7  49.8  -16.2   1.4836   4.2 ------	UNKNOWN                       
305.4889 -42.7453    3.4  39.7  -66.1   1.6812   3.4 ------	UNKNOWN

    Pre-slew background subtracted image of 15-350 keV band 

    Time interval of the image:
-4.532000 43.604590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
347.5450  15.0293    2.0  47.1   45.6   1.7000   5.7 ------	UNKNOWN                       
350.6729  13.0203    1.8  44.8   49.5   1.8932   6.4 ------	UNKNOWN                       
334.5501  15.2804    2.7  50.5   29.5   1.5901   4.3 ------	UNKNOWN                       
350.8700 -12.1415    2.5  19.7   44.8   0.3446   4.6 ------	UNKNOWN                       
  6.3956 -58.0521    0.9  27.7 -139.7   1.0137  12.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
91.804610 962.752200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
359.7471 -14.8269    2.7  43.5   52.3   5.9582   4.2 ------	UNKNOWN                       
  0.2209 -27.8360    2.4  30.5   50.8   2.7990   4.9 ------	UNKNOWN                       
 19.0294 -73.4206    1.7  16.2 -131.2   2.7451   6.7 ------	UNKNOWN                       
308.1132 -32.7117    3.1  46.2  -21.2   2.6831   3.7 ------	UNKNOWN                       
302.2168 -25.6695    3.4  54.9  -21.0   4.9495   3.5 ------	UNKNOWN                       
286.8216 -82.9705    2.9  31.4 -104.9   2.7677   4.0 ------	UNKNOWN