Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat May  9 19:31:40 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger234516
======================================================================

  Trigger: 00234516      Segment: 000

  BAT Trigger Time: 182924348.48   [s; MET]
      Trigger Stop: 182924352.576   [s; MET]
               UTC: 2006-10-19T04:19:06.964420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 91.6165852177475   Dec: 29.572562393964  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.37
     Image Trigger?:     NO
     Rate S/N Ratio:     11.916375287813  [ if not an image trigger ]
     Image S/N Ratio:    7.37

  Analysis Position:   [ source = BAT ]
    RA: 91.6165852177475   Dec: 29.572562393964  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]

    WARNING: the refined image significance was very low.  Treat this 
             detection with extreme caution!


 
  Angular difference between the analysis and refined position is Usage: arcmin
 
  Partial Coding Fraction: 0.05810547    [ including projection effects ]

  Duration
     T90: 180.383999973536 +/- 6.36120237776055
        Measured from: -167.752000004053
                   to: 12.6319999694824     [s; relative to TRIGTIME]
     T50: 168.495999962091 +/- 161.129707151723
        Measured from: -162.487999975681
                   to: 6.00799998641014     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.58000001311302     
                   to: 4.58000001311302     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -169.223999977112     
                   to: 15.1920000016689     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.731978   1.426070   1.061347   0.097694
           0.264258   0.272897   0.239617   0.214427 [error]
 Peak      0.092451   0.078722   0.085755  -0.005488
           0.025188   0.025013   0.020858   0.016459 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  184.416 -169.224   15.192
T90   180.384 -167.752   12.632
T50   168.496 -162.488    6.008
Peak    1.000    3.580    4.580
 
 
====== 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      -1.977    -0.369      0.335       -           -               -         1.39e-03     -3.35e-04          3.21e-04      65.960   57
CPL     -1.577    -0.578      1.519       44.605      N/A           N/A         2.36e-03        N/A               N/A         65.640   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      -2.158     -0.597     0.478       -           -               -         1.32e-02     -4.82e-03          4.35e-03      57.320   57
CPL     -2.225     -0.418     1.865      168.643      N/A           N/A         1.22e-02        N/A               N/A         57.320   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   5.12e-07  7.05e-07  7.16e-07  1.32e-06  2.36e-06  3.25e-06   erg/cm2
      90%_error_low -1.31e-07 -1.33e-07 -2.26e-07 -6.72e-07 -5.25e-07 -9.71e-07   erg/cm2
      90%_error_hi   1.36e-07  1.33e-07  2.34e-07  1.02e-06  5.43e-07  1.23e-06   erg/cm2
Peak flux       PL   1.03e+00  7.04e-01  3.15e-01  1.96e-01  2.14e+00  2.24e+00   ph/cm2/s
      90%_error_low -4.07e-01 -1.99e-01 -1.43e-01 -1.30e-01 -6.24e-01 -6.37e-01   ph/cm2/s
      90%_error_hi   4.40e-01  1.99e-01  1.35e-01  1.95e-01  6.25e-01  6.38e-01   ph/cm2/s
 
Fluence        CPL   4.96e-07  7.42e-07  7.08e-07  6.51e-07  2.27e-06  2.60e-06   erg/cm2
      90%_error_low -1.44e-07 -2.34e-07 -2.65e-07 -4.32e-07 -5.67e-07 -8.69e-07   erg/cm2
      90%_error_hi   1.42e-07  1.80e-07  2.49e-07  1.30e-06  5.78e-07  1.63e-06   erg/cm2
Peak flux      CPL     N/A      N/A      N/A      N/A      N/A      N/A     ph/cm2/s
      90%_error_low -4.07e-01 -1.99e-01 -1.43e-01 -1.30e-01 -6.24e-01 -6.37e-01   ph/cm2/s
      90%_error_hi   4.40e-01  1.99e-01  1.35e-01  1.95e-01  6.25e-01  6.38e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   91.6694    29.5442   0.0349    40.1001    70.3721         4.1065963      5.450 TRIG_00234516                 
 
Foreground time interval of the image:
-169.480  15.864 (delta_t = 185.344 [sec])
Background time interval of the image:
-239.480 -169.480 (delta_t =  70.000 [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 -169.224 sec. to   15.192 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97743     ( -0.368532   0.334637 )
Norm@50keV  : 1.38686E-03    ( -0.000334658   0.000321157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.96 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.946693e-01
 
Photon flux (15-150 keV)    in 184.4 sec: 0.205914 ( -0.038595  0.038603 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35624e-06 ( -5.25361e-07  5.42573e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -169.224 sec. to   15.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5767     ( -0.577837   1.51886 )
Epeak [keV] : 44.6046      (   )
Norm@50keV  : 2.36455E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.64 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     56 degrees of freedom 
# Null hypothesis probability =   1.774432e-01
 
Photon flux (15-150 keV)    in 184.4 sec: 0.203449 ( -0.039207  0.039243 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.26877e-06 ( -5.668e-07  5.78389e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.580 sec. to    4.580 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.15755     ( -0.597257   0.477675 )
Norm@50keV  : 1.32371E-02    ( -0.00482045   0.00434636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.32 using 59 PHA bins.
# Reduced chi-squared =          1.006 for     57 degrees of freedom 
# Null hypothesis probability =   4.631886e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.14390 ( -0.62392  0.62529 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23788e-07 ( -3.82695e-08  3.82997e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.580 sec. to    4.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.22477     ( -0.419484   1.8628 )
Epeak [keV] : 168.643      (   )
Norm@50keV  : 1.22107E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.32 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     56 degrees of freedom 
# Null hypothesis probability =   4.261260e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 180.384 sec.
Hardness ratio (energy fluence ratio) = 1.01580403911

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

    S(15-50 keV)  = 1.2167649e-06
S(50-150 keV) = 1.1394893e-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 (with DETECTION mask) 

    IMX = 2.828634467430531E-01, IMY = -7.931505063363159E-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:
-239.480000 -169.224000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
198.9603  69.2268    3.1  40.7 -169.6   0.4185   3.7 ------	UNKNOWN

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

    Time interval of the image:
-169.224000 15.192000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
161.6889  77.4084    2.4  36.7  170.4   1.6098   4.8 ------	UNKNOWN                       
211.6453  60.2853    2.3  46.2 -156.7   2.1240   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
268.220600 962.600000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9833 -15.6443    0.5  39.8  -58.4  21.0980  23.8    0.3	Sco X-1                       
255.9957 -37.8275    0.6  21.7  -91.5   8.2787  18.6    1.1	4U 1700-377                   
256.4188 -36.4162    2.5  21.6  -87.6   2.0016   4.6    0.9	GX 349+2                      
263.0282 -24.7555    1.4  20.9  -51.3   3.3462   8.2    1.2	GX 1+4                        
264.7316 -44.5949   13.5  16.2 -115.4   0.3363   0.9    8.7	4U 1735-44                    
268.3656  -1.4139    3.6  37.7  -14.6   1.5572   3.2    2.3	SW J1753.5-0127               
270.2597 -25.1041    2.0  15.9  -37.8   2.2713   5.8    2.0	GX 5-1                        
270.3194 -25.7445    3.4  15.4  -39.2   1.3985   3.6    0.9	GRS 1758-258                  
273.9056 -14.0769    2.2  23.9  -12.7   2.3002   5.2    6.3	GX 17+2                       
275.8394 -30.3338    2.7   8.7  -37.2   1.6145   4.3    4.9	H1820-303                     
284.9763 -24.9566    4.5  11.6   17.9   0.8764   2.5    3.9	HT1900.1-2455                 
288.7977  10.9436    1.1  47.7   17.6   9.4618  10.2    0.1	GRS 1915+105                  
263.0085 -33.8937    3.9  16.8  -76.8   1.1410   2.9    3.7	GX 354-0                      
277.3501 -23.7841    2.4  13.7  -13.3   1.7654   4.7 ------	UNKNOWN                       
258.2543 -56.3114    2.8  26.0 -137.3   1.5038   4.2 ------	UNKNOWN                       
243.6111 -55.5795    3.5  32.8 -127.9   1.7573   3.3 ------	UNKNOWN                       
199.9838 -68.7698    3.4  54.0 -143.3   7.9195   3.4 ------	UNKNOWN                       
225.5920 -47.5739    2.9  43.2 -113.3   6.2595   3.9 ------	UNKNOWN                       
241.7320  -8.0072    3.0  47.3  -53.1   6.2065   3.9 ------	UNKNOWN