GRB090607: 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 16:01:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger354299
======================================================================

  Trigger: 00354299      Segment: 000

  BAT Trigger Time: 266045422.208   [s; MET]
      Trigger Stop: 266045422.72   [s; MET]
               UTC: 2009-06-07T05:30:17.401940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 191.208949448038   Dec: 44.1296441879312  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.44
     Image Trigger?:     NO
     Rate S/N Ratio:     18.8679622641132  [ if not an image trigger ]
     Image S/N Ratio:    6.44

  Analysis Position:   [ source = BAT ]
    RA: 191.208949448038   Dec: 44.1296441879312  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 191.191333937601   Dec: 44.1063123603798  [deg; J2000]  
        { 12h 44m 45.9s , +44d 06' 22.7" }
         +/- 1.86012914186531 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.01652124380591 [arcmin] (formal 1-sigma fit error)
    SNR: 12.5330511824791
 
  Angular difference between the analysis and refined position is 1.592323 arcmin
 
  Partial Coding Fraction: 0.96875    [ including projection effects ]

  Duration
     T90: 2.29200002551079 +/- 0.127121992145015
        Measured from: 0.0839999914169312
                   to: 2.37600001692772     [s; relative to TRIGTIME]
     T50: 1.84799998998642 +/- 0.277185829902444
        Measured from: 0.280000001192093
                   to: 2.12799999117851     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.00999999046325684     
                   to: 0.990000009536743     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0600000023841858     
                   to: 2.48800000548363     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.046217   0.054435   0.051471   0.018064
           0.007769   0.008198   0.007523   0.006722 [error]
 Peak      0.028772   0.021631   0.030817   0.009615
           0.005080   0.005306   0.005070   0.004499 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    2.428    0.060    2.488
T90     2.292    0.084    2.376
T50     1.848    0.280    2.128
Peak    1.000   -0.010    0.990
 
 
====== 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: 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      -1.155    -0.294      0.303       -           -               -         4.58e-03     -6.55e-04          6.55e-04      71.540   57
CPL     -1.178    -0.271      0.281     9999.360    -9999.360      -9999.360      4.60e-03        N/A               N/A         71.600   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      -1.135     -0.413     0.425       -           -               -         5.73e-03     -1.05e-03          1.05e-03      69.430   57
CPL     -1.181     -0.369     0.482     9999.360    -9999.360      -9999.360      5.75e-03     -1.04e-03          -5.75e-03      69.500   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   1.03e-08  2.34e-08  4.20e-08  1.78e-07  1.14e-07  2.54e-07   erg/cm2
      90%_error_low -3.05e-09 -4.12e-09 -7.71e-09 -6.71e-08 -1.90e-08 -7.23e-08   erg/cm2
      90%_error_hi   3.33e-09  3.93e-09  7.44e-09  9.35e-08  1.92e-08  9.56e-08   erg/cm2
Peak flux       PL   1.66e-01  2.08e-01  1.90e-01  3.01e-01  6.67e-01  8.64e-01   ph/cm2/s
      90%_error_low -6.62e-02 -5.08e-02 -4.52e-02 -1.40e-01 -1.26e-01 -1.75e-01   ph/cm2/s
      90%_error_hi   7.59e-02  4.67e-02  4.21e-02  2.08e-01  1.26e-01  1.93e-01   ph/cm2/s
 
Fluence        CPL   1.03e-08  2.34e-08  3.97e-08  1.83e-07  1.14e-07  2.45e-07   erg/cm2
      90%_error_low    N/A    -4.13e-09    N/A    -1.03e-07    N/A    -7.40e-08   erg/cm2
      90%_error_hi     N/A     3.92e-09    N/A     1.11e-07    N/A     7.42e-08   erg/cm2
Peak flux      CPL   1.36e-01  9.87e-02  4.87e-02  4.16e-02  2.99e-01  3.24e-01   ph/cm2/s
      90%_error_low -1.36e-01 -9.87e-02 -4.87e-02 -4.16e-02 -2.99e-01 -1.98e-01   ph/cm2/s
      90%_error_hi   8.79e-02  6.30e-02  -1.90e-03  2.19e-02  1.95e-01  2.11e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  191.1913    44.1063   0.0153    19.9310    -6.7939         0.1831166     12.533 TRIG_00354299                 
 
Foreground time interval of the image:
  0.060   2.488 (delta_t =   2.428 [sec])
Background time interval of the image:
-60.208   0.060 (delta_t =  60.268 [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

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    0.060 sec. to    2.488 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15548     ( -0.294583   0.303173 )
Norm@50keV  : 4.57827E-03    ( -0.000655353   0.000655296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.54 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     57 degrees of freedom 
# Null hypothesis probability =   9.309568e-02
 
Photon flux (15-150 keV)    in 2.428 sec: 0.534259 ( -0.078983  0.079194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.14264e-07 ( -1.89582e-08  1.91524e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.060 sec. to    2.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15258     ( -0.272275   0.279751 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 4.60080E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.58 using 59 PHA bins.
# Reduced chi-squared =          1.278 for     56 degrees of freedom 
# Null hypothesis probability =   7.841989e-02
 
Photon flux (15-150 keV)    in 2.428 sec: 0.212325 ( -0.122966  0.113928 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.14116e-07 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.010 sec. to    0.990 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13513     ( -0.41311   0.424513 )
Norm@50keV  : 5.72711E-03    ( -0.00104506   0.00104505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.43 using 59 PHA bins.
# Reduced chi-squared =          1.218 for     57 degrees of freedom 
# Null hypothesis probability =   1.250103e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.666709 ( -0.125502  0.125571 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.92407e-08 ( -1.30175e-08  1.31312e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.010 sec. to    0.990 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13622     ( -0.372179   0.479702 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 5.75376E-03    ( -0.00104885   -0.00575377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.46 using 59 PHA bins.
# Reduced chi-squared =          1.240 for     56 degrees of freedom 
# Null hypothesis probability =   1.066716e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.299375 ( -0.299375  0.195412 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.90269e-08 ( -1.28505e-08  1.32867e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 3.600613765182163E-01, IMY = 4.289605819807337E-02

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:
-60.208000 0.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
202.9037   4.1539    2.2  31.8   98.5   0.7214   5.4 ------	UNKNOWN                       
190.3362   3.1068    3.1  25.7  121.7   0.3514   3.7 ------	UNKNOWN                       
195.2254  69.3617    2.6  43.8  -24.3   0.5343   4.5 ------	UNKNOWN                       

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

Time interval of the image:
0.060000 2.488000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
188.5009  -2.2632    1.7  30.2  129.3   0.1529   6.7 ------	UNKNOWN                       
177.5236  14.9492    2.4  11.8  156.4   0.0709   4.8 ------	UNKNOWN                       
191.1913  44.1063    0.9  19.9   -6.8   0.1831  12.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
59.092590 302.854300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4016  35.2054    4.4  48.2   44.2   1.9920   2.6    8.7	Her X-1                       
259.6061  38.8655    3.5  50.0   37.2   2.8021   3.3 ------	UNKNOWN                       
235.9076  29.0313    3.2  38.4   64.1   1.7807   3.6 ------	UNKNOWN                       
172.9111  -5.1982    2.7  52.0  169.7   2.5207   4.3 ------	UNKNOWN                       
172.5813   7.1828    2.8  40.4  175.6   1.0848   4.2 ------	UNKNOWN                       
294.5325  63.2048    2.6  56.8   -2.1   3.5027   4.5 ------	UNKNOWN                       
160.1390   8.8264    2.1  44.4 -166.9   1.6657   5.6 ------	UNKNOWN                       
  7.7829  81.4179    3.4  54.4  -33.1   3.1465   3.4 ------	UNKNOWN