GRB090429B

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 17:04:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger350854
======================================================================

  Trigger: 00350854      Segment: 000

  BAT Trigger Time: 262675808.064   [s; MET]
      Trigger Stop: 262675809.088   [s; MET]
               UTC: 2009-04-29T05:30:03.365540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 210.703996637861   Dec: 32.1634408652192  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.91
     Image Trigger?:     NO
     Rate S/N Ratio:     24.6981780704569  [ if not an image trigger ]
     Image S/N Ratio:    12.91

  Analysis Position:   [ source = BAT ]
    RA: 210.703996637861   Dec: 32.1634408652192  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 210.673873097901   Dec: 32.1710159410349  [deg; J2000]  
        { 14h 02m 41.7s , +32d 10' 15.7" }
         +/- 1.22639967138261 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.40503102613087 [arcmin] (formal 1-sigma fit error)
    SNR: 22.7248591822103
 
  Angular difference between the analysis and refined position is 1.596053 arcmin
 
  Partial Coding Fraction: 0.84375    [ including projection effects ]

  Duration
     T90: 5.58000001311302 +/- 0.994370163931796
        Measured from: -3.65600001811981
                   to: 1.92399999499321     [s; relative to TRIGTIME]
     T50: 2.45600000023842 +/- 0.272968854266336
        Measured from: -1.89599999785423
                   to: 0.560000002384186     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.280000001192093     
                   to: 0.719999998807907     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.46000000834465     
                   to: 2.47999998927116     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.215565   0.293168   0.135516   0.000577
           0.015594   0.016573   0.014284   0.012179 [error]
 Peak      0.052691   0.085703   0.046581   0.010818
           0.006276   0.006861   0.005823   0.004904 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.940   -4.460    2.480
T90     5.580   -3.656    1.924
T50     2.456   -1.896    0.560
Peak    1.000   -0.280    0.720
 
 
====== 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: CPL)
 
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      -1.892    -0.130      0.126       -           -               -         5.85e-03     -4.97e-04          4.91e-04      60.810   57
CPL     -0.543    -0.676      0.806       45.251      -5.450         8.403      3.45e-02     -2.02e-02          6.60e-02      47.280   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      -1.696     -0.168     0.163       -           -               -         1.23e-02     -1.35e-03          1.33e-03      60.930   57
CPL     -0.653     -0.785     0.963       56.061     -10.842        41.905      4.76e-02     -3.01e-02          1.20e-01      55.540   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   7.50e-08  1.09e-07  1.17e-07  2.35e-07  3.73e-07  5.36e-07   erg/cm2
      90%_error_low -7.68e-09 -7.72e-09 -1.34e-08 -4.95e-08 -3.11e-08 -6.46e-08   erg/cm2
      90%_error_hi   7.85e-09  7.73e-09  1.35e-08  5.76e-08  3.16e-08  7.07e-08   erg/cm2
Peak flux       PL   6.10e-01  5.47e-01  3.38e-01  3.17e-01  1.63e+00  1.81e+00   ph/cm2/s
      90%_error_low -8.83e-02 -5.39e-02 -4.74e-02 -7.85e-02 -1.60e-01 -1.81e-01   ph/cm2/s
      90%_error_hi   9.10e-02  5.39e-02  4.75e-02  9.27e-02  1.60e-01  1.82e-01   ph/cm2/s
 
Fluence        CPL   6.58e-08  1.26e-07  1.09e-07  3.67e-08  3.29e-07  3.37e-07   erg/cm2
      90%_error_low -9.05e-09 -1.12e-08 -1.79e-08 -2.14e-08 -3.38e-08 -3.97e-08   erg/cm2
      90%_error_hi   9.09e-09  1.16e-08  1.68e-08  4.64e-08  3.60e-08  5.63e-08   erg/cm2
Peak flux      CPL   5.47e-01  6.18e-01  3.41e-01  9.40e-02  1.58e+00  1.60e+00   ph/cm2/s
      90%_error_low -1.02e-01 -7.56e-02 -5.80e-02 -5.84e-02 -1.64e-01 -1.76e-01   ph/cm2/s
      90%_error_hi   1.03e-01  7.90e-02  5.52e-02  1.33e-01  1.64e-01  1.93e-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
  210.6739    32.1710   0.0084    24.5118    14.4888         0.6748067     22.725 TRIG_00350854                 
 
Foreground time interval of the image:
 -4.460   2.480 (delta_t =   6.940 [sec])
Background time interval of the image:
-239.064  -4.460 (delta_t = 234.604 [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   -4.460 sec. to    2.480 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.89172     ( -0.129911   0.125964 )
Norm@50keV  : 5.84995E-03    ( -0.000496972   0.000491087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.81 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     57 degrees of freedom 
# Null hypothesis probability =   3.405497e-01
 
Photon flux (15-150 keV)    in 6.94 sec: 0.836646 ( -0.05995  0.059973 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.73293e-07 ( -3.11485e-08  3.15714e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.460 sec. to    2.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.542608     ( -0.675866   0.805904 )
Epeak [keV] : 45.2509      ( -5.44932 8.40346 )
Norm@50keV  : 3.44534E-02    ( -0.0201635   0.0659944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.28 using 59 PHA bins.
# Reduced chi-squared =         0.8443 for     56 degrees of freedom 
# Null hypothesis probability =   7.902438e-01
 
Photon flux (15-150 keV)    in 6.94 sec: 0.793547 ( -0.062854  0.06314 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.2898e-07 ( -3.37714e-08  3.60085e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.280 sec. to    0.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69573     ( -0.16787   0.162968 )
Norm@50keV  : 1.22793E-02    ( -0.00134963   0.00133194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.93 using 59 PHA bins.
# Reduced chi-squared =          1.069 for     57 degrees of freedom 
# Null hypothesis probability =   3.364546e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.62846 ( -0.15964  0.15969 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13747e-07 ( -1.30538e-08  1.32373e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.280 sec. to    0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.653292     ( -0.784852   0.963291 )
Epeak [keV] : 56.0613      ( -10.8402 41.9071 )
Norm@50keV  : 4.75750E-02    ( -0.0301275   0.120453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.54 using 59 PHA bins.
# Reduced chi-squared =         0.9919 for     56 degrees of freedom 
# Null hypothesis probability =   4.920764e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.57677 ( -0.16396  0.16431 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03024e-07 ( -1.44472e-08  1.52475e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 5.58 sec.
Hardness ratio (energy fluence ratio) = 0.870401827647

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

S(15-50 keV)  = 1.9147504e-07
S(50-150 keV) = 1.3750359e-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 = 4.414730130639879E-01, IMY = -1.140805154572180E-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:
-239.064000 -4.460000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
147.5139 -21.4153    2.8  56.2 -164.5   2.6926   4.1 ------	UNKNOWN                       
166.4651  64.7459    2.4  50.3  -45.5   4.9763   4.9 ------	UNKNOWN

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

Time interval of the image:
-4.460000 2.480000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.6739  32.1710    0.5  24.5   14.5   0.6749  22.7 ------	UNKNOWN                       
215.6232  65.3358    2.2  51.5  -19.4   0.3537   5.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
76.836600 962.976000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4963  35.3272   21.2  36.2   -9.2  -0.2855  -0.5    2.1	Her X-1                       
185.6349   0.7337    2.6  39.3  140.1   4.4364   4.5 ------	UNKNOWN                       
271.2300  19.5060    2.6  55.2    5.6   9.6951   4.5 ------	UNKNOWN                       
216.6829  49.2793    3.2  17.7  -69.0   1.5342   3.6 ------	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