GRB110801A: 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: Mon Jan 13 21:29:56 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger458521
======================================================================

  Trigger: 00458521      Segment: 000

  BAT Trigger Time: 333920990.208   [s; MET]
      Trigger Stop: 333920994.304   [s; MET]
               UTC: 2011-08-01T19:49:42.991200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 89.2848875077534   Dec: 80.9884210932685  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.83
     Image Trigger?:     NO
     Rate S/N Ratio:     8.83176086632785  [ if not an image trigger ]
     Image S/N Ratio:    7.83

  Analysis Position:   [ source = BAT ]
    RA: 89.2848875077534   Dec: 80.9884210932685  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 89.416242005594   Dec: 80.9572340073404  [deg; J2000]  
        { 05h 57m 39.9s , +80d 57' 26.0" }
         +/- 1.08438811435936 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.293137695503621 [arcmin] (formal 1-sigma fit error)
    SNR: 27.0928350684791
 
  Angular difference between the analysis and refined position is 2.242909 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 385.255999922752 +/- 8.93474856746104
        Measured from: -11.6999999880791
                   to: 373.555999934673     [s; relative to TRIGTIME]
     T50: 332.339999914169 +/- 7.41289037205683
        Measured from: 8.88800001144409
                   to: 341.227999925613     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 341.783999979496     
                   to: 342.783999979496     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.0879999995232     
                   to: 384.987999975681     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.830347   3.041402   1.978421   0.363293
           0.122160   0.127517   0.117940   0.114943 [error]
 Peak      0.041048   0.051775   0.028862   0.010582
           0.006560   0.006817   0.006020   0.005671 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  409.076  -24.088  384.988
T90   385.256  -11.700  373.556
T50   332.340    8.888  341.228
Peak    1.000  341.784  342.784
 
 
====== 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      -1.824    -0.101      0.099       -           -               -         1.21e-03     -6.93e-05          6.87e-05      76.810   57
CPL     -1.611    -0.290      0.395       83.452     -29.486       -83.452      1.57e-03     -4.17e-04          9.58e-04      75.820   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      -1.859     -0.301     0.279       -           -               -         7.15e-03     -1.41e-03          1.36e-03      60.490   57
CPL     -1.646     -0.612     1.117       70.483     -67.907       -70.483      9.49e-03     -9.49e-03          3.29e-02      60.330   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   8.59e-07  1.30e-06  1.46e-06  3.14e-06  4.56e-06  6.76e-06   erg/cm2
      90%_error_low -6.99e-08 -6.45e-08 -1.17e-07 -5.01e-07 -2.64e-07 -6.09e-07   erg/cm2
      90%_error_hi   7.16e-08  6.45e-08  1.18e-07  5.65e-07  2.67e-07  6.60e-07   erg/cm2
Peak flux       PL   4.16e-01  3.39e-01  1.87e-01  1.51e-01  1.01e+00  1.09e+00   ph/cm2/s
      90%_error_low -8.90e-02 -5.17e-02 -4.76e-02 -6.33e-02 -1.53e-01 -1.72e-01   ph/cm2/s
      90%_error_hi   9.22e-02  5.16e-02  4.86e-02  8.64e-02  1.53e-01  1.74e-01   ph/cm2/s
 
Fluence        CPL   8.33e-07  1.32e-06  1.46e-06  2.17e-06  4.45e-06  5.79e-06   erg/cm2
      90%_error_low -8.25e-08 -7.83e-08 -1.22e-07 -9.73e-07 -3.19e-07 -1.04e-06   erg/cm2
      90%_error_hi   8.35e-08  7.95e-08  1.22e-07  1.47e-06  3.21e-07  1.22e-06   erg/cm2
Peak flux      CPL   4.08e-01  3.48e-01  1.87e-01  1.09e-01  1.00e+00  1.05e+00   ph/cm2/s
      90%_error_low -9.72e-02 -5.90e-02 -5.09e-02 -1.09e-01 -1.56e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   9.76e-02  6.71e-02  5.04e-02  8.86e-02  1.57e-01  2.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   89.4162    80.9572   0.0071    25.3158  -132.0587         3.6557287     27.093 TRIG_00458521                 
 
Foreground time interval of the image:
-24.088  38.493 (delta_t =  62.581 [sec])
Background time interval of the image:
-239.208 -24.088 (delta_t = 215.120 [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  -24.088 sec. to  384.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8241     ( -0.100644   0.0989145 )
Norm@50keV  : 1.21174E-03    ( -6.93572e-05   6.86786e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.81 using 59 PHA bins.
# Reduced chi-squared =          1.347 for     57 degrees of freedom 
# Null hypothesis probability =   4.126035e-02
 
Photon flux (15-150 keV)    in 409.1 sec: 0.168570 ( -0.008549  0.008561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.5611e-06 ( -2.63957e-07  2.66817e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -24.088 sec. to  384.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61094     ( -0.290032   0.39488 )
Epeak [keV] : 83.4516      ( -29.4864 -83.4516 )
Norm@50keV  : 1.57494E-03    ( -0.000417384   0.000957598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.82 using 59 PHA bins.
# Reduced chi-squared =          1.354 for     56 degrees of freedom 
# Null hypothesis probability =   4.005293e-02
 
Photon flux (15-150 keV)    in 409.1 sec: 0.166210 ( -0.009414  0.009415 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45236e-06 ( -3.18844e-07  3.2139e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  341.784 sec. to  342.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.85918     ( -0.300983   0.278597 )
Norm@50keV  : 7.15213E-03    ( -0.00141261   0.00136215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.49 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     57 degrees of freedom 
# Null hypothesis probability =   3.511722e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.00914 ( -0.153374  0.15337 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.57658e-08 ( -1.25929e-08  1.30494e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  341.784 sec. to  342.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64629     ( -0.612359   1.11655 )
Epeak [keV] : 70.4830      ( -67.9057 -70.4819 )
Norm@50keV  : 9.49044E-03    ( -0.00949053   0.0328985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.33 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     56 degrees of freedom 
# Null hypothesis probability =   3.221352e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.00155 ( -0.156429  0.15661 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) 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 = -3.168826698086088E-01, IMY = 3.512100248643446E-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:
-239.208000 -24.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 43.0404   8.0492    2.5  55.1    8.9   4.9786   4.7 ------	UNKNOWN                       
 70.6707  35.3960    2.7  38.0  -38.0   1.2884   4.3 ------	UNKNOWN                       
 99.4821  54.0427    3.3  37.4  -83.5   2.2137   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-24.088000 38.492610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 89.4163  80.9572    0.4  25.3 -132.1   3.6557  27.1 ------	UNKNOWN                       
 69.0541  28.1746    1.9  43.6  -30.7   1.3100   6.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
87.692600 962.907100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.6891  54.5465    2.7  43.8  154.6   5.3048   4.3 ------	UNKNOWN                       
 38.0833  47.4644    2.6  37.4   15.1   3.5133   4.5 ------	UNKNOWN                       
 89.3239  80.9721    1.3   0.0  -97.0   4.7346   8.8 ------	UNKNOWN                       
130.9985  53.2003    2.5  30.6  -96.6   3.6674   4.7 ------	UNKNOWN                       
147.8787  52.9130    2.9  33.2 -115.2   3.6186   4.0 ------	UNKNOWN                       
 69.9515  22.6755    3.4  58.9  -24.1  13.5399   3.5 ------	UNKNOWN                       
183.2005  35.8842    3.3  55.3 -145.3  16.9525   3.6 ------	UNKNOWN                       
182.8224  35.8110    6.4  55.3 -144.9   9.3154   2.2 ------	UNKNOWN                       
170.2602  39.9928    2.8  49.2 -133.6  10.9398   4.1 ------	UNKNOWN                       
 91.9591  31.9307    3.3  49.1  -48.0  10.2028   3.5 ------	UNKNOWN