Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Sep 11 12:03:07 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger382941
======================================================================

  Trigger: 00382941      Segment: 000

  BAT Trigger Time: 285455185.024   [s; MET]
      Trigger Stop: 285455185.088   [s; MET]
               UTC: 2010-01-17T21:06:19.576420    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 11.2598564623618   Dec: -1.59437398006469  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     21.0237960416286  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 11.2598564623618   Dec: -1.59437398006469  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 11.2802214518467   Dec: -1.58655575807628  [deg; J2000]  
        { 00h 45m 07.3s , -01d 35' 11.6" }
         +/- 1.74107016322319 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.900231494926571 [arcmin] (formal 1-sigma fit error)
    SNR: 13.7751118141039
 
  Angular difference between the analysis and refined position is 1.308410 arcmin
 
  Partial Coding Fraction: 0.6640625    [ including projection effects ]

  Duration
     T90: 0.291999936103821 +/- 0.0322490150242218
        Measured from: 0.00400000810623169
                   to: 0.295999944210052     [s; relative to TRIGTIME]
     T50: 0.167999923229218 +/- 0.0483321733182326
        Measured from: 0.0480000376701355
                   to: 0.215999960899353     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.343999981880188     
                   to: 0.656000018119812     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.00800001621246338     
                   to: 0.315999984741211     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.021940   0.036358   0.054029   0.012915
           0.004672   0.005467   0.005341   0.004404 [error]
 Peak      0.019190   0.042952   0.045621   0.013652
           0.007320   0.007885   0.007492   0.006373 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.324   -0.008    0.316
T90     0.292    0.004    0.296
T50     0.168    0.048    0.216
Peak    1.000   -0.344    0.656
 
 
====== 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      -0.879    -0.218      0.229       -           -               -         2.55e-02     -3.40e-03          3.36e-03      62.290   57
CPL     -0.551    -0.434      0.978      265.761    -265.761      -265.761      3.52e-02     -1.25e-02          5.05e-02      61.830   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      -0.916     -0.329     0.357       -           -               -         8.35e-03     -1.62e-03          1.58e-03      56.390   57
CPL     -0.913     -2.924     1.198     9999.360      N/A           N/A         8.40e-03        N/A               N/A         56.400   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   5.92e-09  1.59e-08  3.47e-08  1.97e-07  9.35e-08  2.54e-07   erg/cm2
      90%_error_low -1.54e-09 -2.65e-09 -4.74e-09 -5.52e-08 -1.27e-08 -5.79e-08   erg/cm2
      90%_error_hi   1.68e-09  2.59e-09  4.69e-09  6.94e-08  1.27e-08  7.05e-08   erg/cm2
Peak flux       PL   1.97e-01  2.81e-01  2.98e-01  5.85e-01  9.59e-01  1.36e+00   ph/cm2/s
      90%_error_low -7.63e-02 -7.25e-02 -5.67e-02 -2.15e-01 -1.84e-01 -2.65e-01   ph/cm2/s
      90%_error_hi   8.88e-02  7.02e-02  5.60e-02  2.91e-01  1.86e-01  2.82e-01   ph/cm2/s
 
Fluence        CPL   5.42e-09  1.63e-08  3.61e-08  1.32e-07  9.26e-08  1.90e-07   erg/cm2
      90%_error_low -1.95e-09 -2.81e-09 -5.73e-09 -7.87e-08 -1.31e-08 -7.87e-08   erg/cm2
      90%_error_hi   1.77e-09  2.87e-09  6.06e-09  1.39e-07  1.30e-08  8.31e-08   erg/cm2
Peak flux      CPL   2.03e-01  2.80e-01  2.93e-01  5.81e-01  9.64e-01  1.43e+00   ph/cm2/s
      90%_error_low     N/A       N/A   -5.81e-02     N/A   -2.11e-01 -3.24e-01   ph/cm2/s
      90%_error_hi      N/A       N/A    4.41e-02     N/A    1.99e-01  2.85e-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
   11.2802    -1.5866   0.0140    32.7093   169.8710         0.1315246     13.775 TRIG_00382941                 
 
Foreground time interval of the image:
 -0.008   0.316 (delta_t =   0.324 [sec])
Background time interval of the image:
-239.024  -0.008 (delta_t = 239.016 [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   -0.008 sec. to    0.316 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.878879     ( -0.217597   0.229124 )
Norm@50keV  : 2.54999E-02    ( -0.00339627   0.00335871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.29 using 59 PHA bins.
# Reduced chi-squared =          1.093 for     57 degrees of freedom 
# Null hypothesis probability =   2.934392e-01
 
Photon flux (15-150 keV)    in 0.324 sec: 2.92654 ( -0.38642  0.38749 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.35009e-08 ( -1.26946e-08  1.27457e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.008 sec. to    0.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.551069     ( -0.434273   0.978117 )
Epeak [keV] : 265.761      ( -265.762 -265.762 )
Norm@50keV  : 3.52336E-02    ( -0.0125358   0.0505261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.83 using 59 PHA bins.
# Reduced chi-squared =          1.104 for     56 degrees of freedom 
# Null hypothesis probability =   2.756845e-01
 
Photon flux (15-150 keV)    in 0.324 sec: 2.89685 ( -0.39449  0.39455 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.26092e-08 ( -1.30858e-08  1.30056e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.344 sec. to    0.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.915957     ( -0.32875   0.356974 )
Norm@50keV  : 8.35252E-03    ( -0.00162185   0.00158356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.39 using 59 PHA bins.
# Reduced chi-squared =         0.9894 for     57 degrees of freedom 
# Null hypothesis probability =   4.977762e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.958859 ( -0.184345  0.185521 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.3173e-08 ( -1.78721e-08  1.7949e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.344 sec. to    0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.15324     ( -1.68371   2.43828 )
Epeak [keV] : 51.2372      (   )
Norm@50keV  : 6.61544E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.17 using 59 PHA bins.
# Reduced chi-squared =          1.003 for     56 degrees of freedom 
# Null hypothesis probability =   4.683119e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.963851 ( -0.210813  0.199309 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.35449e-08 ( -2.04057e-08  1.97447e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 0.2919999 sec.
Hardness ratio (energy fluence ratio) = 2.17515466646

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

    S(15-50 keV)  = 2.1863995e-08
S(50-150 keV) = 7.163773e-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 = -6.322094570189947E-01, IMY = -1.129433774141745E-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:
-239.024000 -0.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7678  10.9322    9.6  53.3  -38.8   1.1815   1.2    2.0	GRS 1915+105                  
299.5802  35.2070    0.4  43.4   -6.0  11.3969  32.0    0.6	Cyg X-1                       
308.1440  40.9493    3.0  39.2    5.8   1.1632   3.8    1.5	Cyg X-3                       
325.9324  38.3095    6.4  27.0   18.0   0.4033   1.8   11.3	Cyg X-2                       
 21.7346 -15.4813    2.7  49.3  177.6   1.9788   4.3 ------	UNKNOWN                       
 23.2629 -25.9129    3.2  57.2 -173.7   4.0230   3.7 ------	UNKNOWN                       
 23.4923 -27.7317    3.3  58.6 -172.3   4.8972   3.6 ------	UNKNOWN                       
 19.5304 -31.7290    2.4  59.1 -166.2   7.6029   4.9 ------	UNKNOWN

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

    Time interval of the image:
-0.008000 0.316000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7896  11.0813    3.3  53.2  -38.6   0.1187   3.5    8.2	GRS 1915+105                  
299.6337  35.0885    3.9  43.4   -6.1   0.0369   2.9    7.1	Cyg X-1                       
308.1463  40.9835   33.0  39.3    5.9   0.0038   0.3    2.5	Cyg X-3                       
326.2377  38.1341    0.0  26.7   18.2   0.0065   0.8   11.7	Cyg X-2                       
 11.2802  -1.5866    0.8  32.7  169.9   0.1316  13.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
68.676590 663.136000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1423  38.1425    7.6  57.5  -20.0   2.0527   1.5   10.8	Cyg X-2                       
 10.4314  36.4025    2.6  38.0   20.3   1.9276   4.4 ------	UNKNOWN                       
343.9329  34.6366    2.4  44.3  -11.4   2.0767   4.8 ------	UNKNOWN                       
 29.5502 -57.0324    3.7  57.4 -170.3   4.1367   3.1 ------	UNKNOWN                       
355.5916 -30.4899    4.5  32.5 -133.0   1.0504   2.6 ------	UNKNOWN                       
332.5299 -16.6145    3.0  41.0  -92.5   5.8228   3.8 ------	UNKNOWN