GRB080822B

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 Oct  5 16:00:23 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger321376
======================================================================

  Trigger: 00321376      Segment: 000

  BAT Trigger Time: 241131776   [s; MET]
      Trigger Stop: 241131840   [s; MET]
               UTC: 2008-08-22T21:02:52.960620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 63.4950367894906   Dec: 25.7428354460579  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.15
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.15

  Analysis Position:   [ source = BAT ]
    RA: 63.4950367894906   Dec: 25.7428354460579  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 63.5747866237436   Dec: 25.7525932386815  [deg; J2000]  
        { 04h 14m 17.9s , +25d 45' 09.3" }
         +/- 3.63290421967785 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.01333263860206 [arcmin] (formal 1-sigma fit error)
    SNR: 4.81676653779285
 
  Angular difference between the analysis and refined position is 4.349499 arcmin
 
  Partial Coding Fraction: 0.8203125    [ including projection effects ]

  Duration
     T90: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]
     T50: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100     N/A      N/A      N/A 
T90      N/A      N/A      N/A 
T50      N/A      N/A      N/A 
Peak     N/A      N/A      N/A 
 
 
====== 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      -2.411    -0.577      0.448       -           -               -         2.99e-04     -1.28e-04          1.29e-04      70.640   57
CPL      1.998    -2.706      5.667       30.963      -7.530         6.799      2.20e-01     -2.20e-01          1.44e+03      62.340   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      N/A         N/A       N/A          -           -               -           N/A           N/A               N/A         N/A        N/A   
CPL     N/A         N/A       N/A          N/A         N/A           N/A           N/A           N/A               N/A         N/A        N/A   
 
 
=== 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   5.80e-08  6.12e-08  4.57e-08  5.52e-08  1.86e-07  2.21e-07   erg/cm2
      90%_error_low -1.74e-08 -1.96e-08 -2.34e-08 -3.87e-08 -6.24e-08 -8.60e-08   erg/cm2
      90%_error_hi   1.77e-08  1.93e-08  2.83e-08  7.71e-08  6.87e-08  1.15e-07   erg/cm2
Peak flux       PL     N/A      N/A      N/A      N/A      N/A      N/A     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
   63.5748    25.7526   0.0398    21.6569    28.6219         0.3951002      4.817 TRIG_00321376                 
 
Foreground time interval of the image:
  0.000  64.000 (delta_t =  64.000 [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

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    0.000 sec. to   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.41122     ( -0.559451   0.465323 )
Norm@50keV  : 2.98582E-04    ( -0.000126746   0.000129919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.64 using 59 PHA bins.
# Reduced chi-squared =          1.239 for     57 degrees of freedom 
# Null hypothesis probability =   1.057888e-01
 
Photon flux (15-150 keV)    in 64 sec: 5.55728E-02 ( -0.015226  0.0154215 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86046e-07 ( -6.23944e-08  6.87366e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.9976     ( -2.74837   5.62476 )
Epeak [keV] : 30.9634      ( -7.55271 6.77643 )
Norm@50keV  : 0.220089    ( -0.261864   1437.21 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.34 using 59 PHA bins.
# Reduced chi-squared =          1.113 for     56 degrees of freedom 
# Null hypothesis probability =   2.608753e-01
 
Photon flux (15-150 keV)    in 64 sec: 5.65529E-02 ( -0.0144351  0.0145785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68407e-07 ( -4.59962e-08  4.98006e-08 ) ergs/cm2

1-s peak spectrum fit

1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.

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 = 3.485540760724322E-01, IMY = -1.902110956517583E-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:
0.000000 64.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6276  22.0167    0.3  24.2  -20.2   2.7952  37.1    0.3	Crab                          
 83.2008  67.2990    2.5  22.4 -173.0   0.3560   4.6 ------	UNKNOWN                       
111.7311  21.7526    2.9  37.9  -65.0   0.6870   4.0 ------	UNKNOWN                       
153.1046  57.6232    2.3  47.2 -135.5   1.1995   5.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
-239.000000 363.061700
481.000000 543.063900
661.000000 723.010600
841.000000 903.050200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6331  22.0190    0.1  24.2  -20.2  33.7441  78.2    0.3	Crab                          
304.7214  75.7210    2.5  54.9  165.8  12.2784   4.5 ------	UNKNOWN                       
 65.6261  29.7475    3.9  17.3   28.3   1.2183   2.9 ------	UNKNOWN                       
211.4676  71.5943    4.8  59.1 -166.2   7.6801   2.4 ------	UNKNOWN                       
103.3533  28.0601    3.1  28.1  -62.9   2.0889   3.7 ------	UNKNOWN                       
141.6056  47.2650    3.0  44.5 -118.5   7.1682   3.9 ------	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

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