Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 20:58:13 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger610501
======================================================================

  Trigger: 00610501      Segment: 000

  BAT Trigger Time: 430562440.512   [s; MET]
      Trigger Stop: 430562441.536   [s; MET]
               UTC: 2014-08-24T08:40:28.076080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 206.643863339572   Dec: 33.297259588135  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     14.456832294801  [ if not an image trigger ]
     Image S/N Ratio:    8

  Analysis Position:   [ source = BAT ]
    RA: 206.643863339572   Dec: 33.297259588135  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 206.625485358852   Dec: 33.2855974636198  [deg; J2000]  
        { 13h 46m 30.1s , +33d 17' 08.2" }
         +/- 1.70184385513212 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.611122338868167 [arcmin] (formal 1-sigma fit error)
    SNR: 14.2309233253832
 
  Angular difference between the analysis and refined position is 1.157230 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 3.08399993181229 +/- 0.49061594717433
        Measured from: 0.371999979019165
                   to: 3.45599991083145     [s; relative to TRIGTIME]
     T50: 1.58399993181229 +/- 0.332054229285821
        Measured from: 0.923999965190887
                   to: 2.50799989700317     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.339999973773956     
                   to: 1.33999997377396     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.263999998569489     
                   to: 3.63999998569489     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.127270   0.128587   0.061495   0.016438
           0.012088   0.012560   0.010766   0.010032 [error]
 Peak      0.044785   0.055356   0.027334   0.005897
           0.006776   0.007012   0.006180   0.005456 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.376    0.264    3.640
T90     3.084    0.372    3.456
T50     1.584    0.924    2.508
Peak    1.000    0.340    1.340
 
 
====== 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      -1.988    -0.214      0.204       -           -               -         5.88e-03     -8.27e-04          8.06e-04      54.220   57
CPL     -2.031    -0.075      1.018       29.796      N/A           N/A         5.54e-03        N/A               N/A         54.210   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      -1.869     -0.274     0.257       -           -               -         8.27e-03     -1.50e-03          1.46e-03      57.550   57
CPL     -0.791     -1.265     1.771       45.645      N/A           N/A         3.55e-02        N/A               N/A         55.570   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   4.01e-08  5.49e-08  5.53e-08  1.01e-07  1.83e-07  2.51e-07   erg/cm2
      90%_error_low -6.04e-09 -5.94e-09 -1.05e-08 -3.36e-08 -2.40e-08 -4.63e-08   erg/cm2
      90%_error_hi   6.16e-09  5.93e-09  1.08e-08  4.36e-08  2.46e-08  5.41e-08   erg/cm2
Peak flux       PL   4.86e-01  3.93e-01  2.15e-01  1.73e-01  1.17e+00  1.27e+00   ph/cm2/s
      90%_error_low -1.00e-01 -5.76e-02 -5.01e-02 -6.67e-02 -1.72e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   1.04e-01  5.76e-02  5.11e-02  8.83e-02  1.72e-01  1.90e-01   ph/cm2/s
 
Fluence        CPL   4.03e-08  5.46e-08  5.55e-08  1.13e-07  1.84e-07  2.50e-07   erg/cm2
      90%_error_low -6.86e-09 -1.09e-08 -1.06e-08    N/A    -2.48e-08 -9.16e-08   erg/cm2
      90%_error_hi   6.16e-09  8.70e-09  7.78e-09    N/A     2.25e-08  5.39e-08   erg/cm2
Peak flux      CPL   4.43e-01  4.45e-01  2.07e-01  4.42e-02  1.13e+00  1.14e+00   ph/cm2/s
      90%_error_low -1.18e-01 -5.73e-02 -6.72e-02 -4.42e-02 -1.78e-01 -1.85e-01   ph/cm2/s
      90%_error_hi   1.17e-01  8.87e-02  5.98e-02  1.54e-01  1.79e-01  2.27e-01   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
  206.6255    33.2856   0.0136    27.7291  -137.5581         0.3223930     14.231 TRIG_00610501                 
 
Foreground time interval of the image:
  0.264   3.640 (delta_t =   3.376 [sec])
Background time interval of the image:
-571.111 -556.375 (delta_t =  14.736 [sec])
-239.512   0.264 (delta_t = 239.776 [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    0.264 sec. to    3.640 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98807     ( -0.213875   0.20368 )
Norm@50keV  : 5.87742E-03    ( -0.000827155   0.000806478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9513 for     57 degrees of freedom 
# Null hypothesis probability =   5.799863e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.876876 ( -0.093817  0.09383 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82904e-07 ( -2.39785e-08  2.45651e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.264 sec. to    3.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.03091     ( -0.0728882   1.02074 )
Epeak [keV] : 29.7964      (   )
Norm@50keV  : 5.54222E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.21 using 59 PHA bins.
# Reduced chi-squared =         0.9681 for     56 degrees of freedom 
# Null hypothesis probability =   5.427893e-01
 
Photon flux (15-150 keV)    in 3.376 sec: 0.878433 ( -0.24428  0.09387 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.83947e-07 ( -2.4758e-08  2.24878e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.340 sec. to    1.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86872     ( -0.27423   0.257005 )
Norm@50keV  : 8.26970E-03    ( -0.00150231   0.00146106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.55 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.547196e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.17141 ( -0.171589  0.1716 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.60379e-08 ( -1.34472e-08  1.38415e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.340 sec. to    1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.79085     ( -1.26579   1.77094 )
Epeak [keV] : 45.6451      (   )
Norm@50keV  : 3.54648E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.57 using 59 PHA bins.
# Reduced chi-squared =         0.9923 for     56 degrees of freedom 
# Null hypothesis probability =   4.910457e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.12895 ( -0.178258  0.17906 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.77704e-08 ( -1.43066e-08  1.67633e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 3.084 sec.
Hardness ratio (energy fluence ratio) = 1.00834655101

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

    S(15-50 keV)  = 9.501033e-08
S(50-150 keV) = 8.78939e-08

    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 = -3.879169240787561E-01, IMY = 3.547370087916024E-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:
-571.111390 -556.374900
-239.512000 0.264000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4164  35.3336    2.1  27.1  129.1   1.4501   5.5    2.1	Her X-1                       
244.2953   5.3212    2.5  52.4  159.9   4.3873   4.5 ------	UNKNOWN                       
237.6555  20.5504    3.3  36.3  165.5   0.9953   3.5 ------	UNKNOWN                       
250.0716  65.8697    3.1  13.8   37.1   0.7472   3.7 ------	UNKNOWN                       
 41.2806  66.8622    3.5  56.7    2.8   3.4656   3.3 ------	UNKNOWN                       
235.3429  50.3450    2.9   7.1  144.5   0.7608   4.0 ------	UNKNOWN                       
192.1409  34.6536    3.0  33.1 -116.0   1.2342   3.9 ------	UNKNOWN

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

    Time interval of the image:
0.264000 3.640000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4328  35.2431    6.8  27.2  129.2  -0.0460  -1.7    6.1	Her X-1                       
264.1628  19.2900    2.6  45.3  129.4   0.3536   4.5 ------	UNKNOWN                       
242.7857   5.0346    2.7  52.4  161.8   0.3495   4.3 ------	UNKNOWN                       
206.6255  33.2856    0.8  27.7 -137.6   0.3224  14.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
58.988600 962.549900
1469.488000 1611.692200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5547  35.3496    4.5  39.2   84.8   7.0078   2.6    4.8	Her X-1                       
204.5508 -25.6312    2.9  59.0 -166.1  14.0825   4.1 ------	UNKNOWN                       
133.0755  53.3472    3.8  54.4  -33.1  10.1189   3.0 ------	UNKNOWN