Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 23:41:50 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger536897
======================================================================

  Trigger: 00536897      Segment: 000

  BAT Trigger Time: 373093481.728   [s; MET]
      Trigger Stop: 373093482.24   [s; MET]
               UTC: 2012-10-28T05:04:31.919360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 271.923328992952   Dec: -2.28481991403425  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.54
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6619037896906  [ if not an image trigger ]
     Image S/N Ratio:    9.54

  Analysis Position:   [ source = BAT ]
    RA: 271.923328992952   Dec: -2.28481991403425  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 271.899089650914   Dec: -2.29304074005934  [deg; J2000]  
        { 18h 07m 35.8s , -02d 17' 34.9" }
         +/- 1.47936815826803 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.580447581467959 [arcmin] (formal 1-sigma fit error)
    SNR: 17.3841029243506
 
  Angular difference between the analysis and refined position is 1.534629 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 2.87599992752075 +/- 0.370599538376878
        Measured from: -0.595999956130981
                   to: 2.27999997138977     [s; relative to TRIGTIME]
     T50: 1.59199994802475 +/- 0.164438435196983
        Measured from: 0.208000004291534
                   to: 1.79999995231628     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.043999969959259     
                   to: 0.956000030040741     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.807999968528748     
                   to: 2.47600001096725     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.139243   0.226189   0.127427   0.038971
           0.016668   0.017225   0.014653   0.011950 [error]
 Peak      0.062187   0.102892   0.033617   0.014228
           0.009671   0.009859   0.008167   0.006489 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.284   -0.808    2.476
T90     2.876   -0.596    2.280
T50     1.592    0.208    1.800
Peak    1.000   -0.044    0.956
 
 
====== 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      -1.707    -0.162      0.160       -           -               -         1.10e-02     -1.09e-03          1.08e-03      49.780   57
CPL     -1.399    -0.442      0.728       91.829      N/A           N/A         1.61e-02        N/A               N/A         49.110   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.902     -0.232     0.221       -           -               -         1.38e-02     -2.08e-03          2.04e-03      75.010   57
CPL     -1.096     -1.382     2.125       46.204     -39.006        28.003      4.08e-02     -4.08e-02          7.60e-01      73.930   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   5.62e-08  9.10e-08  1.11e-07  2.69e-07  3.35e-07  5.28e-07   erg/cm2
      90%_error_low -8.27e-09 -8.64e-09 -1.45e-08 -6.58e-08 -3.44e-08 -8.00e-08   erg/cm2
      90%_error_hi   8.55e-09  8.61e-09  1.44e-08  7.85e-08  3.46e-08  8.95e-08   erg/cm2
Peak flux       PL   8.34e-01  6.63e-01  3.55e-01  2.76e-01  1.98e+00  2.13e+00   ph/cm2/s
      90%_error_low -1.58e-01 -8.66e-02 -6.85e-02 -9.08e-02 -2.60e-01 -2.77e-01   ph/cm2/s
      90%_error_hi   1.64e-01  8.64e-02  6.86e-02  1.14e-01  2.60e-01  2.77e-01   ph/cm2/s
 
Fluence        CPL   5.40e-08  9.45e-08  1.13e-07  1.64e-07  3.27e-07  4.25e-07   erg/cm2
      90%_error_low -9.45e-09 -1.06e-08 -1.52e-08 -1.01e-07 -3.87e-08 -1.08e-07   erg/cm2
      90%_error_hi   9.58e-09  1.15e-08  1.54e-08  1.69e-07  3.83e-08  1.37e-07   erg/cm2
Peak flux      CPL   7.80e-01  7.33e-01  3.48e-01  9.49e-02  1.93e+00  1.96e+00   ph/cm2/s
      90%_error_low -1.91e-01 -1.96e-01 -1.11e-01 -9.49e-02 -2.80e-01 -3.03e-01   ph/cm2/s
      90%_error_hi   1.87e-01  1.58e-01  7.93e-02  2.15e-01  2.73e-01  3.61e-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
  271.8991    -2.2930   0.0111    40.1546  -153.9266         0.5628781     17.384 TRIG_00536897                 
 
Foreground time interval of the image:
 -0.808   2.476 (delta_t =   3.284 [sec])
Background time interval of the image:
-99.827  -0.808 (delta_t =  99.019 [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   -0.808 sec. to    2.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70715     ( -0.162475   0.159634 )
Norm@50keV  : 1.10263E-02    ( -0.00108994   0.00107981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.78 using 59 PHA bins.
# Reduced chi-squared =         0.8733 for     57 degrees of freedom 
# Null hypothesis probability =   7.402527e-01
 
Photon flux (15-150 keV)    in 3.284 sec: 1.46815 ( -0.13996  0.14018 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35129e-07 ( -3.44015e-08  3.46508e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.808 sec. to    2.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39945     ( -0.441351   0.728553 )
Epeak [keV] : 91.8287      (   )
Norm@50keV  : 1.61102E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.11 using 59 PHA bins.
# Reduced chi-squared =         0.8769 for     56 degrees of freedom 
# Null hypothesis probability =   7.312287e-01
 
Photon flux (15-150 keV)    in 3.284 sec: 1.45181 ( -0.14426  0.14413 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.27102e-07 ( -3.87299e-08  3.82852e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.044 sec. to    0.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.90195     ( -0.231987   0.22144 )
Norm@50keV  : 1.37613E-02    ( -0.00208173   0.00203684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.01 using 59 PHA bins.
# Reduced chi-squared =          1.316 for     57 degrees of freedom 
# Null hypothesis probability =   5.514766e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.97665 ( -0.26014  0.26038 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26541e-07 ( -1.86364e-08  1.88877e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.044 sec. to    0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0956     ( -1.38898   2.11783 )
Epeak [keV] : 46.2037      ( -38.8865 28.1223 )
Norm@50keV  : 4.08369E-02    ( -0.0416796   0.759065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.93 using 59 PHA bins.
# Reduced chi-squared =          1.320 for     56 degrees of freedom 
# Null hypothesis probability =   5.454525e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.93014 ( -0.27954  0.27312 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 2.876 sec.
Hardness ratio (energy fluence ratio) = 1.22509528203

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

    S(15-50 keV)  = 1.4716536e-07
S(50-150 keV) = 1.8796373e-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 = -7.578466293539096E-01, IMY = 3.708290613622198E-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:
-99.827400 -0.808000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5152  35.3851    1.0   1.1   -8.6   1.2218  11.8    3.8	Her X-1                       
268.3569  -1.5840    7.1  38.3 -149.0   0.2584   1.6    7.9	SW J1753.5-0127               
273.9184 -14.1138    6.9  52.0 -150.9  -0.5801  -1.6    6.9	GX 17+2                       
288.7535  10.9076    1.7  38.4  172.2   1.0941   6.6    3.5	GRS 1915+105                  
299.5906  35.1828    2.1  35.7  128.2   1.2625   5.5    1.1	Cyg X-1                       
308.1079  40.9351    3.8  41.2  117.1   1.3221   3.1    1.1	Cyg X-3                       
178.4475  61.8549    3.1  53.9   17.0   2.1046   3.8 ------	UNKNOWN                       
288.5475   4.4518    2.3  43.0  179.2   0.9160   5.0 ------	UNKNOWN                       
245.7988   9.4733    2.4  26.9 -106.4   0.6764   4.8 ------	UNKNOWN                       
185.8618  27.5875    3.2  58.9  -24.4   2.6571   3.7 ------	UNKNOWN                       
270.3775 -18.6286    2.6  55.3 -145.3   3.2926   4.5 ------	UNKNOWN                       
237.3859  -2.5992    2.8  41.2  -99.9   2.2547   4.1 ------	UNKNOWN

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

    Time interval of the image:
-0.808000 2.476000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6354  35.2851    4.8   0.9  -11.0  -0.0459  -2.4    9.4	Her X-1                       
268.1630  -1.4566   24.5  38.2 -148.8  -0.0143  -0.5   12.3	SW J1753.5-0127               
273.9501 -13.9967    3.5  51.9 -151.0  -0.2131  -3.3    4.0	GX 17+2                       
288.7346  11.0272   35.9  38.4  172.1   0.0101   0.3    6.2	GRS 1915+105                  
299.7529  35.2458    3.3  35.8  128.1  -0.1456  -3.5    8.4	Cyg X-1                       
307.9207  40.9378    7.2  41.1  117.2   0.1185   1.6    8.6	Cyg X-3                       
206.4969  69.1026    2.4  43.5   28.7   0.2128   4.8 ------	UNKNOWN                       
271.8991  -2.2930    0.7  40.2 -153.9   0.5627  17.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
113.572580 962.327800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9742 -15.6466    0.4  29.7 -104.1  25.3189  29.3    0.5	Sco X-1                       
254.4527  35.3523    1.0  41.0   -7.7   9.3573  11.0    0.6	Her X-1                       
255.9711 -37.8320   37.3  38.5 -145.3   0.2535   0.3    1.0	4U 1700-377                   
256.4465 -36.3613    3.0  37.0 -144.8   2.9463   3.8    3.7	GX 349+2                      
263.0192 -24.7053    2.9  24.0 -145.5   2.2277   3.9    2.5	GX 1+4                        
264.8300 -44.4338    5.1  42.6 -158.2   2.2985   2.3    3.9	4U 1735-44                    
268.3489  -1.4465    2.2   3.7  -63.0   3.2558   5.2    1.2	SW J1753.5-0127               
270.2776 -25.1298    1.8  22.9 -161.9   3.9697   6.3    3.1	GX 5-1                        
270.1990 -25.7723    9.3  23.6 -161.8   0.7875   1.2    5.9	GRS 1758-258                  
274.0747 -13.9295    3.3  11.9 -175.9   2.0446   3.5    7.6	GX 17+2                       
275.8682 -30.4609    2.7  28.4 -172.9   2.7622   4.3    6.4	H1820-303                     
284.8506 -24.8199   11.6  25.8  166.5   0.6001   1.0   11.8	HT1900.1-2455                 
288.7868  10.8918    1.7  21.3   65.8   4.4339   6.6    3.3	GRS 1915+105                  
299.5802  35.1898    2.3  45.5   46.4  12.7120   5.0    0.9	Cyg X-1                       
263.1923 -33.9589   23.5  32.7 -152.2   0.3506   0.5   12.6	GX 354-0                      
313.1628 -26.1280    3.8  46.2  139.2   8.7149   3.0 ------	UNKNOWN                       
277.3691 -23.7345    2.1  22.1 -179.0   3.2950   5.5 ------	UNKNOWN                       
288.1309 -51.6493    2.7  51.2 -178.6   6.1460   4.3 ------	UNKNOWN                       
266.3112 -26.3925    0.8  24.7 -153.6   9.4451  14.4 ------	UNKNOWN                       
252.1975  16.7560    2.5  27.2  -30.7   2.6390   4.5 ------	UNKNOWN                       
250.9484 -44.5767    3.6  46.2 -145.0   4.1106   3.3 ------	UNKNOWN                       
	UNKNOWN                       
	UNKNOWN                       
	UNKNOWN