GRB090530

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 16:20:02 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger353567
======================================================================

  Trigger: 00353567      Segment: 000

  BAT Trigger Time: 265346303.168   [s; MET]
      Trigger Stop: 265346303.424   [s; MET]
               UTC: 2009-05-30T03:18:18.384300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 179.394767123952   Dec: 26.5835130140546  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.41
     Image Trigger?:     NO
     Rate S/N Ratio:     23.3452350598575  [ if not an image trigger ]
     Image S/N Ratio:    9.41

  Analysis Position:   [ source = BAT ]
    RA: 179.394767123952   Dec: 26.5835130140546  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 179.402573429353   Dec: 26.5976058675687  [deg; J2000]  
        { 11h 57m 36.6s , +26d 35' 51.4" }
         +/- 1.33955765155656 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.53475593900131 [arcmin] (formal 1-sigma fit error)
    SNR: 20.0329514253767
 
  Angular difference between the analysis and refined position is 0.943618 arcmin
 
  Partial Coding Fraction: 0.4101562    [ including projection effects ]

  Duration
     T90: 40.4560000002384 +/- 7.86754039611046
        Measured from: 0.0439999997615814
                   to: 40.5     [s; relative to TRIGTIME]
     T50: 25.3360000252724 +/- 12.3421490828646
        Measured from: 0.915999978780746
                   to: 26.2520000040531     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0280000269412994     
                   to: 0.971999973058701     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.188000023365021     
                   to: 48.3599999845028     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.489716   0.614132   0.491570   0.104392
           0.047363   0.050234   0.045831   0.042566 [error]
 Peak      0.087103   0.148378   0.112363   0.043693
           0.009498   0.011210   0.010520   0.008833 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   48.548   -0.188   48.360
T90    40.456    0.044   40.500
T50    25.336    0.916   26.252
Peak    1.000   -0.028    0.972
 
 
====== 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      -1.560    -0.152      0.150       -           -               -         2.39e-03     -2.17e-04          2.16e-04      56.230   57
CPL     -1.078    -0.543      0.664       92.142     -30.557       -92.142      4.27e-03     -1.98e-03          5.02e-03      54.220   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      -1.290     -0.143     0.143       -           -               -         2.68e-02     -2.28e-03          2.28e-03      44.770   57
CPL     -1.095     -0.270     0.636      233.623    -233.623      -233.623      3.37e-02     -8.93e-03          3.64e-02      44.440   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   1.57e-07  2.78e-07  3.77e-07  1.06e-06  1.09e-06  1.87e-06   erg/cm2
      90%_error_low -2.17e-08 -2.44e-08 -4.53e-08 -2.44e-07 -1.08e-07 -2.86e-07   erg/cm2
      90%_error_hi   2.24e-08  2.43e-08  4.53e-08  2.90e-07  1.09e-07  3.23e-07   erg/cm2
Peak flux       PL   9.02e-01  1.03e+00  8.42e-01  1.15e+00  3.19e+00  3.92e+00   ph/cm2/s
      90%_error_low -1.35e-01 -9.77e-02 -8.60e-02 -2.26e-01 -2.75e-01 -3.48e-01   ph/cm2/s
      90%_error_hi   1.40e-01  9.67e-02  8.53e-02  2.58e-01  2.75e-01  3.52e-01   ph/cm2/s
 
Fluence        CPL   1.46e-07  2.93e-07  3.85e-07  5.09e-07  1.05e-06  1.33e-06   erg/cm2
      90%_error_low -2.55e-08 -3.03e-08 -4.87e-08 -2.80e-07 -1.20e-07 -3.06e-07   erg/cm2
      90%_error_hi   2.58e-08  3.12e-08  4.92e-08  6.34e-07  1.21e-07  4.39e-07   erg/cm2
Peak flux      CPL   8.74e-01  1.05e+00  8.58e-01  9.01e-01  3.17e+00  3.68e+00   ph/cm2/s
      90%_error_low -1.58e-01 -1.14e-01 -9.59e-02 -4.48e-01 -2.81e-01 -5.30e-01   ph/cm2/s
      90%_error_hi   1.57e-01  1.21e-01  9.90e-02  3.18e-01  2.80e-01  4.59e-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
  179.4026    26.5976   0.0096    35.3419   -52.4392         1.0781821     20.033 TRIG_00353567                 
 
Foreground time interval of the image:
 -0.188   9.533 (delta_t =   9.721 [sec])
Background time interval of the image:
-315.267 -253.121 (delta_t =  62.147 [sec])
-239.168  -0.188 (delta_t = 238.980 [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:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -0.188 sec. to   48.360 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55954     ( -0.152256   0.150027 )
Norm@50keV  : 2.39245E-03    ( -0.000217347   0.000215606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.23 using 59 PHA bins.
# Reduced chi-squared =         0.9865 for     57 degrees of freedom 
# Null hypothesis probability =   5.038432e-01
 
Photon flux (15-150 keV)    in 48.55 sec: 0.303722 ( -0.026305  0.026326 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09217e-06 ( -1.07613e-07  1.08962e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.188 sec. to   48.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0778     ( -0.542958   0.66367 )
Epeak [keV] : 92.1420      ( -30.557 -92.142 )
Norm@50keV  : 4.26522E-03    ( -0.0019781   0.00501958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9682 for     56 degrees of freedom 
# Null hypothesis probability =   5.425011e-01
 
Photon flux (15-150 keV)    in 48.55 sec: 0.297262 ( -0.027471  0.027433 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04758e-06 ( -1.19815e-07  1.2108e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.028 sec. to    0.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.28986     ( -0.142522   0.143498 )
Norm@50keV  : 2.68031E-02    ( -0.00228193   0.00227777 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.77 using 59 PHA bins.
# Reduced chi-squared =         0.7855 for     57 degrees of freedom 
# Null hypothesis probability =   8.800549e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.19183 ( -0.27491  0.27512 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65552e-07 ( -2.52154e-08  2.54192e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.028 sec. to    0.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09503     ( -0.269914   0.63672 )
Epeak [keV] : 233.623      ( -234.033 -234.033 )
Norm@50keV  : 3.37228E-02    ( -0.00891042   0.0364538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.44 using 59 PHA bins.
# Reduced chi-squared =         0.7936 for     56 degrees of freedom 
# Null hypothesis probability =   8.672707e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.17332 ( -0.2809  0.28031 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.61674e-07 ( -2.83067e-08  2.76737e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 40.456 sec.
Hardness ratio (energy fluence ratio) = 1.35706274295

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

S(15-50 keV)  = 4.347478e-07
S(50-150 keV) = 6.574152e-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 = 4.322918947296206E-01, IMY = 5.621379577940212E-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:
-315.267410 -253.120900
-239.168000 -0.188000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.5768 -11.5681    2.8   9.4 -158.2   0.7802   4.1 ------	UNKNOWN                       
198.1505  51.5930    3.0  57.5  -26.4   4.7022   3.8 ------	UNKNOWN                       
140.2377 -24.9579    5.4  54.9 -146.0   2.9886   2.1 ------	UNKNOWN                       
149.4980  -5.2204    2.9  44.3 -121.0   3.4268   4.0 ------	UNKNOWN

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

Time interval of the image:
-0.188000 9.532590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
218.7479 -11.9065    2.2  25.2   76.3   0.2166   5.4 ------	UNKNOWN                       
179.4026  26.5976    0.6  35.3  -52.4   1.0782  20.0 ------	UNKNOWN                       
183.5890  44.1245    1.9  50.8  -39.1   0.8905   6.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
63.932600 722.843000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
219.5274  24.4326    2.7  36.1   54.9   4.0451   4.2 ------	UNKNOWN                       
138.3911  63.5153    2.5  45.5  -53.7  10.7480   4.6 ------	UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve