GRB070628

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: Mon Jan 20 08:47:19 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger283320
======================================================================

  Trigger: 00283320      Segment: 000

  BAT Trigger Time: 204734464.896   [s; MET]
      Trigger Stop: 204734465.92   [s; MET]
               UTC: 2007-06-28T14:41:02.843960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 115.283792218838   Dec: -20.2846481551998  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.08
     Image Trigger?:     NO
     Rate S/N Ratio:     24.3721152139079  [ if not an image trigger ]
     Image S/N Ratio:    12.08

  Analysis Position:   [ source = BAT ]
    RA: 115.283792218838   Dec: -20.2846481551998  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 115.271587247302   Dec: -20.2801849570132  [deg; J2000]  
        { 07h 41m 05.2s , -20d 16' 48.7" }
         +/- 1.22185885560025 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.311826738501272 [arcmin] (formal 1-sigma fit error)
    SNR: 22.8456020462954
 
  Angular difference between the analysis and refined position is 0.737247 arcmin
 
  Partial Coding Fraction: 0.5859375    [ including projection effects ]

  Duration
     T90: 39.080000013113 +/- 4.07110598949185
        Measured from: -26.1159999966621
                   to: 12.9640000164509     [s; relative to TRIGTIME]
     T50: 6.15200001001358 +/- 0.592283710686162
        Measured from: 1.71200001239777
                   to: 7.86400002241135     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.88800001144409     
                   to: 5.88800001144409     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.7360000014305     
                   to: 16.1879999935627     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.001426   2.252915   1.511788   0.040672
           0.059250   0.068902   0.065652   0.074380 [error]
 Peak      0.164791   0.226039   0.147421   0.020496
           0.010493   0.012438   0.011402   0.011811 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   47.924  -31.736   16.188
T90    39.080  -26.116   12.964
T50     6.152    1.712    7.864
Peak    1.000    4.888    5.888
 
 
====== 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      -1.886    -0.080      0.078       -           -               -         8.08e-03     -3.52e-04          3.49e-04      58.760   57
CPL     -1.766    -0.276      0.301       92.466      N/A           N/A         9.33e-03        N/A               N/A         58.250   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      -1.706     -0.120     0.118       -           -               -         3.74e-02     -2.74e-03          2.71e-03      63.460   57
CPL     -1.375     -0.397     0.499       86.624     -28.786       -86.624      5.66e-02     -2.09e-02          4.78e-02      61.880   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   7.11e-07  1.03e-06  1.12e-06  2.26e-06  3.56e-06  5.13e-06   erg/cm2
      90%_error_low -4.66e-08 -4.01e-08 -6.87e-08 -2.84e-07 -1.54e-07 -3.42e-07   erg/cm2
      90%_error_hi   4.77e-08  4.01e-08  6.89e-08  3.11e-07  1.55e-07  3.63e-07   erg/cm2
Peak flux       PL   1.88e+00  1.67e+00  1.03e+00  9.54e-01  4.98e+00  5.53e+00   ph/cm2/s
      90%_error_low -1.94e-01 -1.11e-01 -9.83e-02 -1.71e-01 -3.28e-01 -3.66e-01   ph/cm2/s
      90%_error_hi   1.99e-01  1.11e-01  9.82e-02  1.92e-01  3.28e-01  3.67e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -4.66e-08 -4.01e-08 -6.87e-08 -2.84e-07 -1.54e-07 -3.42e-07   erg/cm2
      90%_error_hi   4.77e-08  4.01e-08  6.89e-08  3.11e-07  1.55e-07  3.63e-07   erg/cm2
Peak flux      CPL   1.80e+00  1.74e+00  1.04e+00  6.18e-01  4.91e+00  5.19e+00   ph/cm2/s
      90%_error_low -2.24e-01 -1.37e-01 -1.04e-01 -2.71e-01 -3.42e-01 -4.53e-01   ph/cm2/s
      90%_error_hi   2.27e-01  1.41e-01  1.05e-01  3.97e-01  3.42e-01  5.73e-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
  115.2716   -20.2802   0.0084    38.1961   -20.3154         6.1653130     22.846 TRIG_00283320                 
 
Foreground time interval of the image:
-31.736  16.188 (delta_t =  47.924 [sec])
Background time interval of the image:
-120.995 -31.736 (delta_t =  89.259 [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  -31.736 sec. to   16.188 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88558     ( -0.0795395   0.0783511 )
Norm@50keV  : 8.08435E-03    ( -0.000352067   0.000349383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.76 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     57 degrees of freedom 
# Null hypothesis probability =   4.108939e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.15322 ( -0.04639  0.04656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.56194e-06 ( -1.53649e-07  1.54667e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -31.736 sec. to   16.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76577     ( -0.27596   0.301422 )
Epeak [keV] : 92.4662      (   )
Norm@50keV  : 9.32911E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.25 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     56 degrees of freedom 
# Null hypothesis probability =   3.927057e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.14314 ( -0.05186  0.05183 ) 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    4.888 sec. to    5.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7063     ( -0.120328   0.117795 )
Norm@50keV  : 3.74401E-02    ( -0.00273936   0.00271022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.46 using 59 PHA bins.
# Reduced chi-squared =          1.113 for     57 degrees of freedom 
# Null hypothesis probability =   2.592563e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.98367 ( -0.32754  0.32769 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.46537e-07 ( -2.65886e-08  2.68765e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.888 sec. to    5.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37497     ( -0.396701   0.498777 )
Epeak [keV] : 86.6245      ( -28.7862 -86.6245 )
Norm@50keV  : 5.65792E-02    ( -0.0208581   0.0478474 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.88 using 59 PHA bins.
# Reduced chi-squared =          1.105 for     56 degrees of freedom 
# Null hypothesis probability =   2.741830e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.91075 ( -0.34179  0.34164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 39.08 sec.
Hardness ratio (energy fluence ratio) = 1.08258005743

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

S(15-50 keV)  = 1.7453457e-06
S(50-150 keV) = 1.816597e-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 = 7.378699333075571E-01, IMY = 2.731714232833398E-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:
-120.995400 -31.736000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4455 -40.4787    7.6  55.3    8.0  -1.1563  -1.5    5.9	Vela X-1                      
 66.0313 -22.3114    2.8   8.2  134.1   0.5272   4.2 ------	UNKNOWN                       
123.6269  -1.2856    2.9  51.5  -43.0   2.5698   4.0 ------	UNKNOWN                       
108.6753   7.7730    3.5  43.6  -64.2   1.9943   3.3 ------	UNKNOWN

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

Time interval of the image:
-31.736000 16.188000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5135 -40.4683   76.3  55.4    8.0   0.1799   0.1    5.2	Vela X-1                      
 23.7938 -17.9155    2.3  47.8  145.6   4.1633   5.1 ------	UNKNOWN                       
115.2716 -20.2802    0.5  38.2  -20.3   6.1656  22.8 ------	UNKNOWN                       
 31.2854  21.2869    3.1  59.1 -166.1   4.1947   3.8 ------	UNKNOWN                       
117.0003  -0.4954    3.2  45.9  -47.9   1.9165   3.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

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