GRB090709A: Summary Image Light curves Spectra Distribution Others

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 15:36:31 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger356890
======================================================================

  Trigger: 00356890      Segment: 000

  BAT Trigger Time: 268817919.488   [s; MET]
      Trigger Stop: 268817920.512   [s; MET]
               UTC: 2009-07-09T07:38:34.592520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 289.933176236556   Dec: 60.7311647159044  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.31
     Image Trigger?:     NO
     Rate S/N Ratio:     43.5430821141545  [ if not an image trigger ]
     Image S/N Ratio:    17.31

  Analysis Position:   [ source = BAT ]
    RA: 289.933176236556   Dec: 60.7311647159044  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 289.944342258413   Dec: 60.7278806459312  [deg; J2000]  
        { 19h 19m 46.6s , +60d 43' 40.4" }
         +/- 0.664424288040391 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.172793605025459 [arcmin] (formal 1-sigma fit error)
    SNR: 54.5465975884804
 
  Angular difference between the analysis and refined position is 0.382264 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 88.7439999580383 +/- 1.12051415709472
        Measured from: -1.25199997425079
                   to: 87.4919999837875     [s; relative to TRIGTIME]
     T50: 31.0839999318123 +/- 0.452636704127899
        Measured from: 23.2200000286102
                   to: 54.3039999604225     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 21.8280000090599     
                   to: 22.8280000090599     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -67.2960000038147     
                   to: 101.472000002861     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     8.031392  13.115885  12.410792   3.720451
           0.083290   0.091916   0.087266   0.072803 [error]
 Peak      0.189804   0.336213   0.360296   0.120268
           0.008957   0.011172   0.011533   0.008937 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  168.768  -67.296  101.472
T90    88.744   -1.252   87.492
T50    31.084   23.220   54.304
Peak    1.000   21.828   22.828
 
 
====== 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      -1.209    -0.025      0.025       -           -               -         1.48e-02     -2.06e-04          2.06e-04      39.210   57
CPL     -1.073    -0.093      0.103      439.211    -158.485       943.249      1.67e-02     -7.49e-04          1.56e-03      33.870   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      -1.025     -0.063     0.064       -           -               -         6.76e-02     -2.42e-03          2.42e-03      37.360   57
CPL     -0.724     -0.247     0.262      243.019     -86.649       730.726      9.21e-02     -2.02e-02          2.75e-02      33.010   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   2.43e-06  5.34e-06  9.24e-06  3.71e-05  2.53e-05  5.41e-05   erg/cm2
      90%_error_low -7.55e-08 -9.87e-08 -1.23e-07 -1.17e-06 -3.24e-07 -1.19e-06   erg/cm2
      90%_error_hi   7.66e-08  9.87e-08  1.23e-07  1.20e-06  3.24e-07  1.21e-06   erg/cm2
Peak flux       PL   1.77e+00  2.36e+00  2.32e+00  4.10e+00  7.79e+00  1.05e+01   ph/cm2/s
      90%_error_low -1.28e-01 -1.04e-01 -9.29e-02 -3.47e-01 -2.84e-01 -4.20e-01   ph/cm2/s
      90%_error_hi   1.31e-01  1.04e-01  9.25e-02  3.68e-01  2.84e-01  4.25e-01   ph/cm2/s
 
Fluence        CPL   2.32e-06  5.34e-06  9.38e-06  3.21e-05  2.52e-05  4.92e-05   erg/cm2
      90%_error_low -1.08e-07 -1.00e-07 -1.62e-07 -3.18e-06 -3.35e-07 -3.16e-06   erg/cm2
      90%_error_hi   1.10e-07  9.99e-08  1.63e-07  3.58e-06  3.35e-07  3.33e-06   erg/cm2
Peak flux      CPL   8.98e-01  6.87e-01  3.69e-01  3.47e-01  2.09e+00  2.34e+00   ph/cm2/s
      90%_error_low -1.06e-01 -1.42e-01 -4.96e-02 -1.70e-02 -4.09e-01 -4.01e-01   ph/cm2/s
      90%_error_hi   1.83e-01  1.10e-01  3.64e-02  1.41e-02  3.07e-01  2.28e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  289.9443    60.7279   0.0035    19.1104   -93.2045         6.5682266     54.547 TRIG_00356890                 
 
Foreground time interval of the image:
-49.787  16.613 (delta_t =  66.400 [sec])
Background time interval of the image:

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

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  -67.296 sec. to  101.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20946     ( -0.0245909   0.0246825 )
Norm@50keV  : 1.48000E-02    ( -0.000206478   0.000206079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.21 using 59 PHA bins.
# Reduced chi-squared =         0.6880 for     57 degrees of freedom 
# Null hypothesis probability =   9.652633e-01
 
Photon flux (15-150 keV)    in 168.8 sec: 1.73958 ( -0.0273  0.02738 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.52815e-05 ( -3.2451e-07  3.23937e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -67.296 sec. to  101.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07315     ( -0.092756   0.102714 )
Epeak [keV] : 439.211      ( -158.548 943.187 )
Norm@50keV  : 1.67101E-02    ( -0.000748798   0.00155954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.87 using 59 PHA bins.
# Reduced chi-squared =         0.6049 for     56 degrees of freedom 
# Null hypothesis probability =   9.915618e-01
 
Photon flux (15-150 keV)    in 168.8 sec: 1.71981 ( -0.03049  0.03065 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.51682e-05 ( -3.35063e-07  3.3482e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   21.828 sec. to   22.828 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02473     ( -0.0633282   0.0636653 )
Norm@50keV  : 6.75714E-02    ( -0.00242066   0.00241961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.36 using 59 PHA bins.
# Reduced chi-squared =         0.6555 for     57 degrees of freedom 
# Null hypothesis probability =   9.794314e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.79062 ( -0.28406  0.28423 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24453e-07 ( -2.88683e-08  2.8972e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   21.828 sec. to   22.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.724291     ( -0.247358   0.262407 )
Epeak [keV] : 243.019      ( -86.6488 730.726 )
Norm@50keV  : 9.20583E-02    ( -0.0202272   0.0275232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.01 using 59 PHA bins.
# Reduced chi-squared =         0.5895 for     56 degrees of freedom 
# Null hypothesis probability =   9.938785e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.09354 ( -0.40869  0.30724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.13378e-07 ( -3.0725e-08  3.05998e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 88.744 sec.
Hardness ratio (energy fluence ratio) = 1.72973652696

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

S(15-50 keV)  = 7.771449e-06
S(50-150 keV) = 1.7509808e-05

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 = -1.936842256253885E-02, IMY = 3.459417550868899E-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:
 

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

Time interval of the image:
-49.787400 16.612600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5853  35.4805    8.4  29.5  179.8   0.1677   1.4   10.4	Her X-1                       
288.6720  10.7955    7.5  31.0   95.3   0.3149   1.5   11.7	GRS 1915+105                  
299.6047  35.1908    0.4   8.9   43.3   2.7980  25.9    1.0	Cyg X-1                       
308.1638  41.0442   10.5  12.3   -3.2   0.1199   1.1    6.0	Cyg X-3                       
326.1726  38.3223   63.3  26.4   -4.8   0.0239   0.2    0.1	Cyg X-2                       
253.6014  53.3555    2.3  27.9 -142.6   0.6419   5.1 ------	UNKNOWN                       
289.9443  60.7279    0.2  19.1  -93.2   6.5685  54.5 ------	UNKNOWN                       
236.8091  48.3496    2.3  38.6 -151.3   0.8463   5.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
57.212600 538.412610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6971  35.2763   40.0  33.9  146.7  -0.5247  -0.3   12.4	Her X-1                       
299.6148  35.2125    0.9  26.2   71.0  19.4661  13.4    1.4	Cyg X-1                       
308.2396  40.7885   17.0  22.9   51.3   0.9294   0.7   11.5	Cyg X-3                       
326.0660  38.3572    6.9  31.7   27.3   2.5272   1.7    5.4	Cyg X-2                       
297.3541  27.6935    2.6  33.4   77.1   9.1162   4.5 ------	UNKNOWN                       
234.3248  45.8116    3.7  35.1  179.8   4.3803   3.2 ------	UNKNOWN                       
289.9643  60.7279    1.2   0.0  -61.6  10.3652   9.6 ------	UNKNOWN                       
  8.2564  31.4627    2.3  57.3   -8.1  22.2508   5.0 ------	UNKNOWN                       
198.3789  37.3468    3.7  58.8 -159.3  23.5416   3.1 ------	UNKNOWN                       
180.7906  71.6683    3.4  39.0 -119.1   8.0788   3.4 ------	UNKNOWN                       
 33.3278  54.2892    3.4  50.1  -43.2  16.7188   3.4 ------	UNKNOWN