GRB090708

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 15:40:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger356776
======================================================================

  Trigger: 00356776      Segment: 000

  BAT Trigger Time: 268717100.16   [s; MET]
      Trigger Stop: 268717104.256   [s; MET]
               UTC: 2009-07-08T03:38:15.267780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 154.628878204965   Dec: 26.636688851161  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.69
     Image Trigger?:     NO
     Rate S/N Ratio:     13.0384048104053  [ if not an image trigger ]
     Image S/N Ratio:    7.69

  Analysis Position:   [ source = BAT ]
    RA: 154.628878204965   Dec: 26.636688851161  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 154.634669732545   Dec: 26.6116401870788  [deg; J2000]  
        { 10h 18m 32.3s , +26d 36' 41.9" }
         +/- 1.68487155041845 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.799458119438161 [arcmin] (formal 1-sigma fit error)
    SNR: 14.4361546844792
 
  Angular difference between the analysis and refined position is 1.534688 arcmin
 
  Partial Coding Fraction: 0.2734375    [ including projection effects ]

  Duration
     T90: 8.70799994468689 +/- 1.39436723529632
        Measured from: 0.495999991893768
                   to: 9.20399993658066     [s; relative to TRIGTIME]
     T50: 4.07199996709824 +/- 1.42666042084233
        Measured from: 2.47599995136261
                   to: 6.54799991846085     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.37199997901917     
                   to: 4.37199997901917     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.171999990940094     
                   to: 9.55199998617172     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.286741   0.311957   0.202016   0.027521
           0.032268   0.035088   0.031168   0.027929 [error]
 Peak      0.043312   0.045341   0.042130   0.006093
           0.010340   0.011526   0.010095   0.008944 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.380    0.172    9.552
T90     8.708    0.496    9.204
T50     4.072    2.476    6.548
Peak    1.000    3.372    4.372
 
 
====== 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      -1.863    -0.219      0.208       -           -               -         5.80e-03     -8.33e-04          8.15e-04      60.300   57
CPL     -1.172    -0.779      0.955       53.002     -17.694       -53.002      1.41e-02     -8.64e-03          3.37e-02      58.050   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      -1.923     -0.460     0.396       -           -               -         9.05e-03     -2.62e-03          2.46e-03      59.380   57
CPL     -1.523     -0.671     1.786       56.133      N/A           N/A         1.49e-02        N/A               N/A         59.160   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   9.78e-08  1.44e-07  1.58e-07  3.27e-07  5.00e-07  7.28e-07   erg/cm2
      90%_error_low -1.68e-08 -1.74e-08 -3.01e-08 -1.09e-07 -7.07e-08 -1.45e-07   erg/cm2
      90%_error_hi   1.73e-08  1.74e-08  3.05e-08  1.39e-07  7.19e-08  1.68e-07   erg/cm2
Peak flux       PL   5.60e-01  4.40e-01  2.32e-01  1.77e-01  1.31e+00  1.41e+00   ph/cm2/s
      90%_error_low -1.77e-01 -9.92e-02 -8.50e-02 -1.00e-01 -2.97e-01 -3.22e-01   ph/cm2/s
      90%_error_hi   1.89e-01  9.92e-02  8.49e-02  1.50e-01  2.97e-01  3.23e-01   ph/cm2/s
 
Fluence        CPL   9.11e-08  1.57e-07  1.59e-07  1.15e-07  4.73e-07  5.22e-07   erg/cm2
      90%_error_low -1.90e-08 -2.27e-08 -3.46e-08 -7.92e-08 -7.51e-08 -1.13e-07   erg/cm2
      90%_error_hi   1.91e-08  2.36e-08  3.38e-08  2.54e-07  7.78e-08  2.69e-07   erg/cm2
Peak flux      CPL   5.31e-01  4.61e-01  2.39e-01  1.13e-01  1.30e+00  1.34e+00   ph/cm2/s
      90%_error_low -2.13e-01     N/A   -9.07e-02 -1.13e-01 -2.93e-01 -3.27e-01   ph/cm2/s
      90%_error_hi   2.01e-01     N/A    9.66e-02  1.08e-01  3.01e-01  3.76e-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
  154.6347    26.6116   0.0133    42.6323  -136.7072         0.9271376     14.436 TRIG_00356776                 
 
Foreground time interval of the image:
  0.172   9.552 (delta_t =   9.380 [sec])
Background time interval of the image:
-239.160   0.172 (delta_t = 239.332 [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    0.172 sec. to    9.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86325     ( -0.219247   0.208086 )
Norm@50keV  : 5.79939E-03    ( -0.000832808   0.000814818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.30 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.573924e-01
 
Photon flux (15-150 keV)    in 9.38 sec: 0.819639 ( -0.09965  0.099693 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00199e-07 ( -7.07189e-08  7.19419e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.172 sec. to    9.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17186     ( -0.778611   0.955387 )
Epeak [keV] : 53.0018      ( -17.694 -53.0018 )
Norm@50keV  : 1.40976E-02    ( -0.00863583   0.0337355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.05 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     56 degrees of freedom 
# Null hypothesis probability =   3.994814e-01
 
Photon flux (15-150 keV)    in 9.38 sec: 0.802046 ( -0.101518  0.101594 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.73143e-07 ( -7.51342e-08  7.77823e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    3.372 sec. to    4.372 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92344     ( -0.459997   0.395892 )
Norm@50keV  : 9.05409E-03    ( -0.00261732   0.00246116 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.38 using 59 PHA bins.
# Reduced chi-squared =          1.042 for     57 degrees of freedom 
# Null hypothesis probability =   3.890040e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.31257 ( -0.29687  0.29696 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.32818e-08 ( -2.24263e-08  2.30492e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    3.372 sec. to    4.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52344     ( -0.671589   1.785 )
Epeak [keV] : 56.1330      (   )
Norm@50keV  : 1.48694E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.16 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     56 degrees of freedom 
# Null hypothesis probability =   3.610488e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.29848 ( -0.29343  0.30111 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 8.708 sec.
Hardness ratio (energy fluence ratio) = 1.09946126306

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

S(15-50 keV)  = 2.418904e-07
S(50-150 keV) = 2.5830701e-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 = -6.700580134324728E-01, IMY = 6.312728320884469E-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:
-239.160000 0.172000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
291.1477  71.7181    2.4  36.9   69.0   2.3637   4.8 ------	UNKNOWN                       
174.8613  12.7048    4.4  58.7 -159.2   3.3928   2.6 ------	UNKNOWN                       
 56.3313  35.0263    6.5  58.6  -23.1   2.1195   1.8 ------	UNKNOWN                       
 75.0377  35.2418    2.1  51.9  -39.8   5.4482   5.6 ------	UNKNOWN

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

Time interval of the image:
0.172000 9.552000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
172.6084  18.5935    2.3  52.5 -157.9   0.4366   5.0 ------	UNKNOWN                       
154.6347  26.6117    0.8  42.6 -136.7   0.9272  14.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
205.740590 362.910000
420.840000 761.640590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2809  35.2937    4.1  41.8   20.7  -1.5861  -2.8    9.1	Her X-1                       
266.2988  25.3886    3.6  50.2   36.9   4.5356   3.2 ------	UNKNOWN                       
198.3113 -27.4633    2.0  44.4  168.2   3.5537   5.6 ------	UNKNOWN                       
195.7141 -15.8429    2.4  35.1  179.8   1.6706   4.7 ------	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