GRB090814A: 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 14:28:33 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger359951
======================================================================

  Trigger: 00359951      Segment: 000

  BAT Trigger Time: 271903944   [s; MET]
      Trigger Stop: 271904032   [s; MET]
               UTC: 2009-08-14T00:52:19.004460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 239.610943588386   Dec: 25.5991346877481  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.01
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.01

  Analysis Position:   [ source = BAT ]
    RA: 239.610943588386   Dec: 25.5991346877481  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 239.605893390461   Dec: 25.5855749429351  [deg; J2000]  
        { 15h 58m 25.4s , +25d 35' 08.1" }
         +/- 2.09569684026191 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.08725678218903 [arcmin] (formal 1-sigma fit error)
    SNR: 10.5700666273931
 
  Angular difference between the analysis and refined position is 0.858256 arcmin
 
  Partial Coding Fraction: 0.375    [ including projection effects ]

  Duration
     T90: 78.0640000104904 +/- 7.9849017527002
        Measured from: -12.527999997139
                   to: 65.5360000133514     [s; relative to TRIGTIME]
     T50: 40.8160000443459 +/- 10.5262612675172
        Measured from: 1.64800000190735
                   to: 42.4640000462532     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.89200001955032     
                   to: 6.89200001955032     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.3999999761581     
                   to: 72.9279999732971     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.767247   0.880985   0.506916  -0.006547
           0.078144   0.081053   0.071873   0.062584 [error]
 Peak      0.016398   0.029016   0.015534   0.012112
           0.008498   0.008739   0.008029   0.006983 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   87.328  -14.400   72.928
T90    78.064  -12.528   65.536
T50    40.816    1.648   42.464
Peak    1.000    5.892    6.892
 
 
====== 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      -1.842    -0.195      0.186       -           -               -         1.56e-03     -1.97e-04          1.93e-04      45.350   57
CPL     -1.019    -0.773      0.933       52.435     -12.563        95.064      4.48e-03     -2.77e-03          1.02e-02      42.010   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      -1.413     -0.706     0.710       -           -               -         4.39e-03     -1.73e-03          1.69e-03      63.040   57
CPL     -1.001     -7.513     7.003      115.103    -115.103      -115.103      7.25e-03     -4.57e-03          4.64e+01      62.990   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   2.40e-07  3.58e-07  3.99e-07  8.43e-07  1.25e-06  1.84e-06   erg/cm2
      90%_error_low -3.62e-08 -3.77e-08 -6.76e-08 -2.55e-07 -1.57e-07 -3.32e-07   erg/cm2
      90%_error_hi   3.73e-08  3.77e-08  6.84e-08  3.18e-07  1.60e-07  3.82e-07   erg/cm2
Peak flux       PL   1.66e-01  1.76e-01  1.32e-01  1.61e-01  5.36e-01  6.36e-01   ph/cm2/s
      90%_error_low -9.88e-02 -7.43e-02 -6.38e-02 -1.61e-01 -2.06e-01 -2.45e-01   ph/cm2/s
      90%_error_hi   1.18e-01  7.13e-02  6.25e-02  2.23e-01  2.07e-01  2.55e-01   ph/cm2/s
 
Fluence        CPL   2.20e-07  3.94e-07  3.96e-07  2.50e-07  1.16e-06  1.26e-06   erg/cm2
      90%_error_low -4.24e-08 -5.05e-08 -7.84e-08 -1.64e-07 -1.67e-07 -2.39e-07   erg/cm2
      90%_error_hi   4.23e-08  5.22e-08  7.64e-08  5.20e-07  1.77e-07  5.33e-07   erg/cm2
Peak flux      CPL   1.57e-01  1.84e-01  1.35e-01  9.72e-02  5.28e-01  5.72e-01   ph/cm2/s
      90%_error_low -1.23e-01 -8.11e-02 -1.35e-01 -9.72e-02 -2.27e-01 -2.71e-01   ph/cm2/s
      90%_error_hi   1.26e-01  1.08e-01  7.26e-02  1.40e-01  2.13e-01  3.10e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  239.6059    25.5856   0.0182    30.2294    73.4195         1.8617064     10.570 TRIG_00359951                 
 
Foreground time interval of the image:
-14.400  72.928 (delta_t =  87.328 [sec])
Background time interval of the image:
-239.000 -14.400 (delta_t = 224.600 [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  -14.400 sec. to   72.928 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84191     ( -0.194949   0.186148 )
Norm@50keV  : 1.55808E-03    ( -0.000196969   0.000193094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.35 using 59 PHA bins.
# Reduced chi-squared =         0.7956 for     57 degrees of freedom 
# Null hypothesis probability =   8.670292e-01
 
Photon flux (15-150 keV)    in 87.33 sec: 0.218300 ( -0.023076  0.023082 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25148e-06 ( -1.5714e-07  1.60058e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -14.400 sec. to   72.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01902     ( -0.772679   0.933418 )
Epeak [keV] : 52.4351      ( -12.563 95.0633 )
Norm@50keV  : 4.47506E-03    ( -0.00277359   0.0101533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.01 using 59 PHA bins.
# Reduced chi-squared =         0.7501 for     56 degrees of freedom 
# Null hypothesis probability =   9.173514e-01
 
Photon flux (15-150 keV)    in 87.33 sec: 0.211713 ( -0.02386  0.023867 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16403e-06 ( -1.67126e-07  1.76738e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.892 sec. to    6.892 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41322     ( -0.705999   0.709947 )
Norm@50keV  : 4.39175E-03    ( -0.00172617   0.00168586 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.04 using 59 PHA bins.
# Reduced chi-squared =          1.106 for     57 degrees of freedom 
# Null hypothesis probability =   2.712414e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.536470 ( -0.205609  0.206816 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.23282e-08 ( -1.7776e-08  1.85848e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.892 sec. to    6.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00062     ( -7.50519   7.01094 )
Epeak [keV] : 115.103      ( -117.329 -117.329 )
Norm@50keV  : 7.25398E-03    ( -0.00444932   46.4204 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.99 using 59 PHA bins.
# Reduced chi-squared =          1.125 for     56 degrees of freedom 
# Null hypothesis probability =   2.427891e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.527513 ( -0.22669  0.21307 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.06631e-08 ( -2.10268e-08  1.99714e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 78.064 sec.
Hardness ratio (energy fluence ratio) = 1.11586109178

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

S(15-50 keV)  = 5.97544e-07
S(50-150 keV) = 6.539379e-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 = 1.662802453038599E-01, IMY = -5.584711544197322E-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:
-239.000000 -14.400000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6591  35.3577    0.0  42.6   55.5   0.8802   1.5    9.9	Her X-1                       
183.5191  75.1946    3.4  50.8  -16.5   1.3712   3.4 ------	UNKNOWN                       
182.1965 -23.3680    2.3  54.2 -162.1   2.5775   5.0 ------	UNKNOWN                       
177.4738 -26.2201    3.1  58.7 -159.2   4.5053   3.7 ------	UNKNOWN                       
170.0696 -16.7091    3.0  54.9 -146.0   4.8513   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-14.400000 72.928000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5518  35.3555    4.7  42.5   55.5   1.0049   2.4    4.7	Her X-1                       
262.7037  55.4267    2.7  50.4   28.7   1.9568   4.3 ------	UNKNOWN                       
239.6057  25.5856    1.1  30.2   73.4   1.8632  10.6 ------	UNKNOWN                       
234.3036  16.6878    2.1  27.8   93.9   0.8840   5.5 ------	UNKNOWN                       
221.9050  13.5727    2.1  19.2  116.7   0.6253   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
148.700640 963.070700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9784 -15.6520    0.4  41.6  156.9  38.2260  32.5    0.7	Sco X-1                       
254.5019  35.4152    2.6  16.1   33.8   2.5451   4.4    4.9	Her X-1                       
268.3011  -1.5009    4.9  38.8  114.7   3.7091   2.3    5.0	SW J1753.5-0127               
297.7510  44.2309    4.8  50.0   37.3   5.8171   2.5 ------	UNKNOWN                       
275.8821  62.6643    3.2  44.1    7.7   3.2265   3.7 ------	UNKNOWN                       
294.2235  72.6949    3.6  55.4    1.9   6.4758   3.2 ------	UNKNOWN                       
251.8230  59.6612    3.3  35.1   -4.5   2.5643   3.5 ------	UNKNOWN                       
221.3571 -19.8927    2.4  48.8 -172.3   6.1307   4.9 ------	UNKNOWN                       
197.9786  -4.5161    3.6  50.4 -136.0  10.8632   3.2 ------	UNKNOWN