Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Nov 23 17:40:00 EST 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger618024
======================================================================

  Trigger: 00618024      Segment: 000

  BAT Trigger Time: 437205008   [s; MET]
      Trigger Stop: 437205072   [s; MET]
               UTC: 2014-11-09T05:49:55.236180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 144.507384595436   Dec: -0.601526628868278  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.73
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.73

  Analysis Position:   [ source = BAT ]
    RA: 144.507384595436   Dec: -0.601526628868278  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 144.507   Dec: -0.601526  [deg; J2000]
        { 09h 38m 01.7s , 00d -36' -5.5" }
        +/- 2.55123760927 [arcmin] (estimated 90% radius based on SNR)
    SNR: 7.98182995415
 
 
  Angular difference between the analysis and refined position is 0.023074 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 200.187999904156 +/- 48.1482022400133
        Measured from: 16.9200000166893
                   to: 217.107999920845     [s; relative to TRIGTIME]
     T50: 48.3439999818802 +/- 11.3944779637891
        Measured from: 96.2879999876022
                   to: 144.631999969482     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 117.39200001955     
                   to: 118.39200001955     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.596000015735626     
                   to: 323.152000010014     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.980070   4.141428   3.178942   0.764430
           0.114221   0.118789   0.103520   0.091623 [error]
 Peak      0.071700   0.111624   0.101028   0.036412
           0.006945   0.007944   0.007228   0.005974 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  322.556    0.596  323.152
T90   200.188   16.920  217.108
T50    48.344   96.288  144.632
Peak    1.000  117.392  118.392
 
 
====== 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      -1.510    -0.066      0.066       -           -               -         2.18e-03     -7.53e-05          7.52e-05      51.900   57
CPL     -1.456    -0.085      0.246      512.002    -512.002      -512.002      2.31e-03     -3.60e-04          6.98e-04      51.760   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      -1.181     -0.129     0.130       -           -               -         2.06e-02     -1.49e-03          1.49e-03      51.180   57
CPL     -1.134     -0.179     0.285      969.537    -969.537      -969.537      2.17e-02     -2.52e-03          6.86e-03      51.500   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   9.06e-07  1.66e-06  2.33e-06  6.85e-06  6.66e-06  1.17e-05   erg/cm2
      90%_error_low -5.92e-08 -6.29e-08 -1.04e-07 -6.72e-07 -2.49e-07 -7.39e-07   erg/cm2
      90%_error_hi   6.06e-08  6.27e-08  1.04e-07  7.23e-07  2.50e-07  7.80e-07   erg/cm2
Peak flux       PL   6.25e-01  7.60e-01  6.71e-01  1.02e+00  2.41e+00  3.07e+00   ph/cm2/s
      90%_error_low -8.60e-02 -6.45e-02 -5.78e-02 -1.77e-01 -1.78e-01 -2.40e-01   ph/cm2/s
      90%_error_hi   8.95e-02  6.36e-02  5.73e-02  2.00e-01  1.78e-01  2.44e-01   ph/cm2/s
 
Fluence        CPL   8.96e-07  1.66e-06  2.33e-06  6.31e-06  6.63e-06  1.12e-05   erg/cm2
      90%_error_low -7.31e-08 -6.51e-08 -1.07e-07 -1.89e-06 -2.82e-07 -1.90e-06   erg/cm2
      90%_error_hi   6.12e-08  6.96e-08  1.11e-07  1.58e-06  2.57e-07  7.87e-07   erg/cm2
Peak flux      CPL   6.31e-01  7.56e-01  6.65e-01  1.16e+00  2.42e+00  3.22e+00   ph/cm2/s
      90%_error_low     N/A   -7.46e-02     N/A       N/A   -1.93e-01 -5.07e-01   ph/cm2/s
      90%_error_hi      N/A    8.25e-02     N/A       N/A    1.63e-01  7.20e-02   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-50.0 keV image (Event data)

    #RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
144.507 -0.602 0.000 22.337 70.049 0.663 7.982 TRIG_00618024
 
Image time interval: 0.000 to 64.000 [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    0.596 sec. to  323.152 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50969     ( -0.0657611   0.0656952 )
Norm@50keV  : 2.18047E-03    ( -7.52901e-05   7.51969e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.90 using 59 PHA bins.
# Reduced chi-squared =         0.9104 for     57 degrees of freedom 
# Null hypothesis probability =   6.664733e-01
 
Photon flux (15-150 keV)    in 322.6 sec: 0.272931 ( -0.009954  0.009988 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.66337e-06 ( -2.4914e-07  2.50075e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.596 sec. to  323.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45625     ( -0.0844678   0.246558 )
Epeak [keV] : 512.002      ( -536.195 -536.195 )
Norm@50keV  : 2.31342E-03    ( -0.000359072   0.000699257 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.76 using 59 PHA bins.
# Reduced chi-squared =         0.9243 for     56 degrees of freedom 
# Null hypothesis probability =   6.358710e-01
 
Photon flux (15-150 keV)    in 322.6 sec: 0.271927 ( -0.010861  0.010305 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.63382e-06 ( -2.81614e-07  2.56899e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  117.392 sec. to  118.392 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18091     ( -0.128912   0.130296 )
Norm@50keV  : 2.05871E-02    ( -0.00148821   0.00148795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.18 using 59 PHA bins.
# Reduced chi-squared =         0.8979 for     57 degrees of freedom 
# Null hypothesis probability =   6.920649e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.41023 ( -0.17755  0.17779 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10029e-07 ( -1.72454e-08  1.7376e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  117.392 sec. to  118.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17668     ( -0.179116   0.285183 )
Epeak [keV] : 9999.33      ( -9999.34 -9999.34 )
Norm@50keV  : 2.06883E-02    ( -0.00149473   0.00788347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.21 using 59 PHA bins.
# Reduced chi-squared =         0.9144 for     56 degrees of freedom 
# Null hypothesis probability =   6.564857e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.42476 ( -0.19256  0.16277 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.09952e-07 ( -1.72705e-08  1.7364e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 200.188 sec.
Hardness ratio (energy fluence ratio) = 1.40478586226

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

    S(15-50 keV)  = 2.5620986e-06
S(50-150 keV) = 4.101351e-06

    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 = 0.140201622092, IMY = -0.38623325455

    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:
-17.499410 0.596000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6902 -40.4569    8.0  51.8   18.8   0.2976   1.5    9.4	Vela X-1                      
127.8659  15.3657    2.5  40.1   99.5   0.9227   4.6 ------	UNKNOWN                       
149.2154  53.4782    2.8  52.5  156.1   1.0301   4.2 ------	UNKNOWN                       
200.7789  46.4804    2.2  52.7 -161.9   0.6374   5.2 ------	UNKNOWN

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

    Time interval of the image:
0.596000 73.900600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4689 -40.4681    5.8  51.9   18.9   1.8138   2.0    5.9	Vela X-1                      
144.5581  -0.5858    1.8  22.3   70.1   1.7040   6.4 ------	UNKNOWN                       
181.7213  55.5027    3.0  53.9  179.6   2.7169   3.9 ------	UNKNOWN                       
213.8152  35.4277    2.5  54.4 -143.6   4.9608   4.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
118.300590 520.800680
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5309 -40.5491    0.6  40.8   -6.3   9.7194  19.9    0.4	Vela X-1                      
144.5246  -0.6068    0.6   0.0  173.9   6.8833  20.0 ------	UNKNOWN                       
184.3653  47.0385    3.9  59.0 -166.2   6.9393   3.0 ------	UNKNOWN                       
167.8610  -6.9441    2.6  24.1  -91.0   1.8100   4.5 ------	UNKNOWN                       
184.7662  21.3466    2.8  45.0 -138.5   3.1592   4.1 ------	UNKNOWN                       
174.1213 -34.0324    2.8  43.4  -53.4   4.3099   4.1 ------	UNKNOWN