GRB050528

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: Wed Jan 22 21:56:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger130679
======================================================================

  Trigger: 00130679      Segment: 000

  BAT Trigger Time: 138946004.672   [s; MET]
      Trigger Stop: 138946008.768   [s; MET]
               UTC: 2005-05-28T04:06:45.128040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 353.529041992498   Dec: 45.9437076292292  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3041346956501  [ if not an image trigger ]
     Image S/N Ratio:    8

  Analysis Position:   [ source = BAT ]
    RA: 353.529041992498   Dec: 45.9437076292292  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 353.528902937186   Dec: 45.9583933346038  [deg; J2000]  
        { 23h 34m 06.9s , +45d 57' 30.2" }
         +/- 2.185302668337 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.760422857831697 [arcmin] (formal 1-sigma fit error)
    SNR: 9.95638803477859
 
  Angular difference between the analysis and refined position is 0.881161 arcmin
 
  Partial Coding Fraction: 0.2734375    [ including projection effects ]

  Duration
     T90: 11.2480000257492 +/- 1.72823149014381
        Measured from: -6.66400000452995
                   to: 4.58400002121925     [s; relative to TRIGTIME]
     T50: 6.65999999642372 +/- 2.50901811119854
        Measured from: -3.32799997925758
                   to: 3.33200001716614     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.4200000166893     
                   to: 4.4200000166893     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.11599999666214     
                   to: 4.9839999973774     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.262857   0.343895   0.111201   0.003653
           0.036022   0.037750   0.031888   0.028884 [error]
 Peak      0.032375   0.056285   0.036144   0.002430
           0.010235   0.011378   0.009592   0.008389 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.100   -8.116    4.984
T90    11.248   -6.664    4.584
T50     6.660   -3.328    3.332
Peak    1.000    3.420    4.420
 
 
====== 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      -2.237    -0.268      0.245       -           -               -         3.58e-03     -6.62e-04          6.45e-04      47.730   57
CPL     -0.443    -1.412      1.785       34.096     -20.980         8.054      4.18e-02     -4.18e-02          4.41e-01      42.800   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      -1.522     -0.385     0.386       -           -               -         9.65e-03     -2.26e-03          2.25e-03      71.250   57
CPL     -0.669     -1.183     2.850       77.857     -30.616       -77.857      2.63e-02     -2.63e-02          4.18e+00      70.580   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   1.20e-07  1.41e-07  1.20e-07  1.73e-07  4.43e-07  5.54e-07   erg/cm2
      90%_error_low -2.15e-08 -1.98e-08 -2.91e-08 -6.94e-08 -6.95e-08 -1.11e-07   erg/cm2
      90%_error_hi   2.21e-08  1.97e-08  3.02e-08  9.38e-08  7.10e-08  1.28e-07   erg/cm2
Peak flux       PL   4.05e-01  4.03e-01  2.81e-01  3.09e-01  1.21e+00  1.40e+00   ph/cm2/s
      90%_error_low -1.55e-01 -1.06e-01 -7.77e-02 -1.43e-01 -2.96e-01 -3.25e-01   ph/cm2/s
      90%_error_hi   1.74e-01  1.03e-01  7.61e-02  1.98e-01  2.99e-01  3.25e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -2.15e-08 -1.98e-08 -2.91e-08 -6.94e-08 -6.95e-08 -1.11e-07   erg/cm2
      90%_error_hi   2.21e-08  1.97e-08  3.02e-08  9.38e-08  7.10e-08  1.28e-07   erg/cm2
Peak flux      CPL   3.51e-01  4.39e-01  3.02e-01  1.35e-01  1.18e+00  1.23e+00   ph/cm2/s
      90%_error_low -1.94e-01 -1.28e-01 -8.96e-02 -1.35e-01 -3.08e-01 -3.49e-01   ph/cm2/s
      90%_error_hi   2.04e-01  1.56e-01  9.46e-02  2.32e-01  3.06e-01  3.99e-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
  353.5289    45.9584   0.0193    50.2565  -173.8444         0.7368429      9.956 TRIG_00130679                 
 
Foreground time interval of the image:
 -8.116   4.984 (delta_t =  13.100 [sec])
Background time interval of the image:
-299.672  -8.116 (delta_t = 291.556 [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   -8.116 sec. to    4.984 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.23705     ( -0.268361   0.245086 )
Norm@50keV  : 3.57836E-03    ( -0.000662073   0.00064465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.73 using 59 PHA bins.
# Reduced chi-squared =         0.8373 for     57 degrees of freedom 
# Null hypothesis probability =   8.042988e-01
 
Photon flux (15-150 keV)    in 13.1 sec: 0.604257 ( -0.082611  0.082659 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.43263e-07 ( -6.95305e-08  7.10186e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -8.116 sec. to    4.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.442977     ( -1.41153   1.7848 )
Epeak [keV] : 34.0964      ( -20.9797 8.05439 )
Norm@50keV  : 4.18419E-02    ( -0.0418439   0.440686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.80 using 59 PHA bins.
# Reduced chi-squared =         0.7644 for     56 degrees of freedom 
# Null hypothesis probability =   9.026213e-01
 
Photon flux (15-150 keV)    in 13.1 sec: 0.574450 ( -0.08503  0.08549 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    3.420 sec. to    4.420 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52175     ( -0.38541   0.385637 )
Norm@50keV  : 9.64937E-03    ( -0.0022558   0.00225046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.25 using 59 PHA bins.
# Reduced chi-squared =          1.250 for     57 degrees of freedom 
# Null hypothesis probability =   9.709881e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.21182 ( -0.296484  0.29878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.12347e-08 ( -2.23377e-08  2.24809e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    3.420 sec. to    4.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.669032     ( -1.18362   2.84982 )
Epeak [keV] : 77.8568      ( -30.5829 -77.824 )
Norm@50keV  : 2.62778E-02    ( -0.026306   4.18445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.58 using 59 PHA bins.
# Reduced chi-squared =          1.260 for     56 degrees of freedom 
# Null hypothesis probability =   9.093618e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.18110 ( -0.307515  0.30579 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.69601e-08 ( -2.7446e-08  2.44668e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 11.248 sec.
Hardness ratio (energy fluence ratio) = 0.84851543943

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

S(15-50 keV)  = 2.616468e-07
S(50-150 keV) = 1.8162059e-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 = -1.195712943438739E+00, IMY = 1.289594431820725E-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:
-299.672000 -8.116000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
349.5245  50.0493    2.6  55.1 -173.8   2.4988   4.5 ------	UNKNOWN                       
355.4470  56.6718    2.8  59.0 -166.2   4.3563   4.2 ------	UNKNOWN

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

Time interval of the image:
-8.116000 4.984000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
353.5289  45.9584    1.2  50.3 -173.8   0.7369  10.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
111.428600 302.397300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0150  40.7808    8.8  33.2   97.3  -0.3730  -1.3   11.2	Cyg X-3                       
326.2971  38.4434  141.1  21.6   78.9  -0.0120  -0.1    9.4	Cyg X-2                       
307.3245  42.7390    2.9  32.9  101.0   1.0374   4.0 ------	UNKNOWN                       
 82.9093  58.3358    2.9  51.9 -138.6   2.5097   4.0 ------	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