Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 03:49:01 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger525671
======================================================================

  Trigger: 00525671      Segment: 000

  BAT Trigger Time: 363029131.584   [s; MET]
      Trigger Stop: 363029132.096   [s; MET]
               UTC: 2012-07-03T17:25:22.198180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 339.356638623791   Dec: -29.7359171074292  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.58
     Image Trigger?:     NO
     Rate S/N Ratio:     83.5044908971967  [ if not an image trigger ]
     Image S/N Ratio:    20.58

  Analysis Position:   [ source = BAT ]
    RA: 339.356638623791   Dec: -29.7359171074292  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 339.352974693959   Dec: -29.7236278424924  [deg; J2000]  
        { 22h 37m 24.7s , -29d 43' 25.1" }
         +/- 0.820089870244882 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.282345114500347 [arcmin] (formal 1-sigma fit error)
    SNR: 40.3806639035525
 
  Angular difference between the analysis and refined position is 0.761667 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 51.7039999961853 +/- 21.3961574883969
        Measured from: -31.3040000200272
                   to: 20.3999999761581     [s; relative to TRIGTIME]
     T50: 3.93199992179871 +/- 0.806771373355719
        Measured from: -1.95999997854233
                   to: 1.97199994325638     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0559999942779541     
                   to: 1.05599999427795     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -44.4959999918938     
                   to: 32.6040000319481     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.799898   2.135802   1.710953   0.355024
           0.070012   0.072901   0.065051   0.055412 [error]
 Peak      0.253019   0.421642   0.470219   0.174053
           0.012310   0.015491   0.016511   0.012512 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   77.100  -44.496   32.604
T90    51.704  -31.304   20.400
T50     3.932   -1.960    1.972
Peak    1.000    0.056    1.056
 
 
====== 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      -1.593    -0.074      0.074       -           -               -         5.24e-03     -2.07e-04          2.06e-04      62.020   57
CPL     -1.491    -0.140      0.292      262.227    -262.227      -262.227      5.87e-03     -8.02e-04          2.17e-03      61.640   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      -1.062     -0.068     0.069       -           -               -         9.11e-02     -3.49e-03          3.49e-03      65.580   57
CPL     -1.044     -0.085     0.271     9824.160    -9824.160      -9824.160      9.25e-02     -4.43e-03          2.56e-03      65.880   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   5.63e-07  9.78e-07  1.30e-06  3.51e-06  3.79e-06  6.35e-06   erg/cm2
      90%_error_low -4.06e-08 -4.13e-08 -6.74e-08 -3.92e-07 -1.59e-07 -4.38e-07   erg/cm2
      90%_error_hi   4.17e-08  4.11e-08  6.72e-08  4.25e-07  1.60e-07  4.64e-07   erg/cm2
Peak flux       PL   2.47e+00  3.23e+00  3.09e+00  5.26e+00  1.05e+01  1.40e+01   ph/cm2/s
      90%_error_low -1.91e-01 -1.52e-01 -1.34e-01 -4.81e-01 -4.12e-01 -5.91e-01   ph/cm2/s
      90%_error_hi   1.96e-01  1.51e-01  1.33e-01  5.11e-01  4.13e-01  5.98e-01   ph/cm2/s
 
Fluence        CPL   5.51e-07  9.85e-07  1.31e-06  3.02e-06  3.76e-06  5.86e-06   erg/cm2
      90%_error_low -5.12e-08 -4.57e-08 -7.13e-08 -9.96e-07 -1.79e-07 -1.01e-06   erg/cm2
      90%_error_hi   4.08e-08  4.63e-08  7.23e-08  5.90e-07  1.77e-07  6.44e-07   erg/cm2
Peak flux      CPL   2.46e+00  3.23e+00  3.10e+00  5.20e+00  1.05e+01  1.39e+01   ph/cm2/s
      90%_error_low -2.46e-01 -1.43e-01 -1.36e-01 -1.31e+00 -4.10e-01 -1.30e+00   ph/cm2/s
      90%_error_hi   1.52e-01  1.58e-01  1.64e-01  3.39e-01  4.16e-01  6.87e-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
  339.3530   -29.7236   0.0047    30.4418    36.3931         5.5163093     40.381 TRIG_00525671                 
 
Foreground time interval of the image:
-44.496  10.517 (delta_t =  55.013 [sec])
Background time interval of the image:
-239.584 -44.496 (delta_t = 195.088 [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  -44.496 sec. to   32.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.59255     ( -0.0744869   0.0741211 )
Norm@50keV  : 5.24417E-03    ( -0.00020701   0.000206475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.02 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.017833e-01
 
Photon flux (15-150 keV)    in 77.1 sec: 0.672376 ( -0.02784  0.027955 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.78525e-06 ( -1.5936e-07  1.60092e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -44.496 sec. to   32.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49133     ( -0.140286   0.291992 )
Epeak [keV] : 262.227      ( -262.221 -262.221 )
Norm@50keV  : 5.86709E-03    ( -0.000801758   0.00217128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.64 using 59 PHA bins.
# Reduced chi-squared =          1.101 for     56 degrees of freedom 
# Null hypothesis probability =   2.815039e-01
 
Photon flux (15-150 keV)    in 77.1 sec: 0.667618 ( -0.030556  0.030273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.75539e-06 ( -1.79412e-07  1.76893e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.056 sec. to    1.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06227     ( -0.0684052   0.0687323 )
Norm@50keV  : 9.10964E-02    ( -0.00349049   0.00348844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.58 using 59 PHA bins.
# Reduced chi-squared =          1.151 for     57 degrees of freedom 
# Null hypothesis probability =   2.036900e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.5313 ( -0.4125  0.4129 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.64317e-07 ( -4.11506e-08  4.12708e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.056 sec. to    1.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05687     ( -0.0852476   0.271201 )
Epeak [keV] : 9999.99      ( -9999.99 -9999.99 )
Norm@50keV  : 9.16120E-02    ( -0.00349605   0.00349433 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.58 using 59 PHA bins.
# Reduced chi-squared =          1.171 for     56 degrees of freedom 
# Null hypothesis probability =   1.786809e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.5256 ( -0.4097  0.4165 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.64384e-07 ( -4.32348e-08  3.87755e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 51.704 sec.
Hardness ratio (energy fluence ratio) = 1.32638701993

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

    S(15-50 keV)  = 1.5411176e-06
S(50-150 keV) = 2.2441723e-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 = 4.730598618759329E-01, IMY = -3.486816869462041E-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:
-239.584000 -44.496000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5952  35.1659    4.9  51.4  170.9   1.3651   2.4    2.2	Cyg X-1                       
308.1895  41.0290    7.2  49.9 -177.7   0.6495   1.6    5.8	Cyg X-3                       
326.2617  38.4188    9.6  40.0 -163.4   0.2920   1.2    7.2	Cyg X-2                       
297.4891   1.8309    2.4  43.1  126.2   3.3418   4.9 ------	UNKNOWN                       
325.5066  17.2307    2.9  22.2  173.1   0.6468   4.0 ------	UNKNOWN                       
 27.5421 -29.6020    2.3  54.0  -17.5   2.3665   5.0 ------	UNKNOWN                       
323.5791  56.8859    2.8  57.8 -156.7   4.1340   4.1 ------	UNKNOWN                       
 30.6366  -8.3051    2.5  50.6  -44.4   4.1605   4.6 ------	UNKNOWN

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

    Time interval of the image:
-44.496000 10.516610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5276  35.1214    8.2  51.4  170.8   0.4650   1.4    5.7	Cyg X-1                       
308.3472  40.9218    0.0  49.7 -177.7  -0.1291  -0.5   10.9	Cyg X-3                       
325.9973  38.4052    4.5  40.0 -163.7  -0.3661  -2.6    9.6	Cyg X-2                       
292.9305  15.8612    2.4  49.4  144.7   2.2940   4.7 ------	UNKNOWN                       
339.3530 -29.7236    0.3  30.4   36.4   5.5164  40.4 ------	UNKNOWN                       
 31.8781 -27.3290    2.5  56.6  -21.9   1.7494   4.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
70.516600 416.516600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
343.4090 -50.4937    2.3  21.0   -0.8   1.1676   5.0 ------	UNKNOWN