GRB110208A

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: Tue Jan 14 00:20:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger445038
======================================================================

  Trigger: 00445038      Segment: 000

  BAT Trigger Time: 318892252.992   [s; MET]
      Trigger Stop: 318892254.016   [s; MET]
               UTC: 2011-02-08T21:10:46.347120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.4841525330872   Dec: -20.6284702440465  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.81
     Image Trigger?:     NO
     Rate S/N Ratio:     10.4880884817015  [ if not an image trigger ]
     Image S/N Ratio:    7.81

  Analysis Position:   [ source = BAT ]
    RA: 22.4841525330872   Dec: -20.6284702440465  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 22.4871021227482   Dec: -20.5669009562798  [deg; J2000]  
        { 01h 29m 56.9s , -20d 34' 00.8" }
         +/- 1.82918642735477 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.01566019976205 [arcmin] (formal 1-sigma fit error)
    SNR: 12.837017604591
 
  Angular difference between the analysis and refined position is 3.697870 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 15.9840000867844 +/- 3.8721984041116
        Measured from: -1.06400001049042
                   to: 14.9200000762939     [s; relative to TRIGTIME]
     T50: 6.59200000762939 +/- 3.2880389390134
        Measured from: 0.48800003528595
                   to: 7.08000004291534     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.460000038146973     
                   to: 1.46000003814697     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.54399996995926     
                   to: 17.527999997139     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.170942   0.175066   0.088846   0.011231
           0.020892   0.020967   0.018633   0.016821 [error]
 Peak      0.018534   0.034971   0.021084   0.004359
           0.004964   0.005087   0.004456   0.003906 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   19.072   -1.544   17.528
T90    15.984   -1.064   14.920
T50     6.592    0.488    7.080
Peak    1.000    0.460    1.460
 
 
====== 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      -1.938    -0.262      0.243       -           -               -         1.32e-03     -2.32e-04          2.25e-04      54.950   57
CPL     -1.017    -1.017      1.351       43.726      N/A           N/A         4.56e-03        N/A               N/A         52.610   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      -1.469     -0.290     0.285       -           -               -         5.02e-03     -9.52e-04          9.44e-04      45.460   57
CPL      0.910     -1.654     2.479       55.302     -10.590        28.683      9.62e-02     -9.62e-02          1.87e+00      38.600   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   4.87e-08  6.87e-08  7.17e-08  1.38e-07  2.32e-07  3.27e-07   erg/cm2
      90%_error_low -8.84e-09 -9.29e-09 -1.67e-08 -5.43e-08 -3.84e-08 -7.53e-08   erg/cm2
      90%_error_hi   9.09e-09  9.25e-09  1.73e-08  7.41e-08  3.98e-08  9.11e-08   erg/cm2
Peak flux       PL   2.01e-01  2.06e-01  1.49e-01  1.72e-01  6.22e-01  7.27e-01   ph/cm2/s
      90%_error_low -5.51e-02 -3.90e-02 -3.44e-02 -6.67e-02 -1.14e-01 -1.36e-01   ph/cm2/s
      90%_error_hi   5.91e-02  3.87e-02  3.44e-02  8.82e-02  1.14e-01  1.38e-01   ph/cm2/s
 
Fluence        CPL   4.53e-08  7.64e-08  6.77e-08  3.21e-08  2.11e-07  2.21e-07   erg/cm2
      90%_error_low -1.00e-08 -1.26e-08 -2.14e-08    N/A    -4.04e-08 -4.96e-08   erg/cm2
      90%_error_hi   1.00e-08  1.32e-08  1.98e-08    N/A     4.52e-08  1.22e-07   erg/cm2
Peak flux      CPL   1.44e-01  2.58e-01  1.55e-01  2.07e-02  5.76e-01  5.78e-01   ph/cm2/s
      90%_error_low -6.50e-02 -5.41e-02 -4.82e-02 -2.07e-02 -1.15e-01 -1.17e-01   ph/cm2/s
      90%_error_hi   7.02e-02  5.72e-02  4.50e-02  6.02e-02  1.17e-01  1.23e-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
   22.4871   -20.5669   0.0150    13.7464   158.6575         0.4851449     12.837 TRIG_00445038                 
 
Foreground time interval of the image:
 -1.544  17.528 (delta_t =  19.072 [sec])
Background time interval of the image:
-239.992  -1.544 (delta_t = 238.448 [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   -1.544 sec. to   17.528 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.93751     ( -0.262178   0.243375 )
Norm@50keV  : 1.32485E-03    ( -0.000231542   0.000225383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.95 using 59 PHA bins.
# Reduced chi-squared =         0.9641 for     57 degrees of freedom 
# Null hypothesis probability =   5.521947e-01
 
Photon flux (15-150 keV)    in 19.07 sec: 0.193243 ( -0.025689  0.02569 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32467e-07 ( -3.84228e-08  3.97596e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.544 sec. to   17.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01734     ( -1.01702   1.35136 )
Epeak [keV] : 43.7259      (   )
Norm@50keV  : 4.56209E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.61 using 59 PHA bins.
# Reduced chi-squared =         0.9395 for     56 degrees of freedom 
# Null hypothesis probability =   6.038672e-01
 
Photon flux (15-150 keV)    in 19.07 sec: 0.186844 ( -0.026372  0.026522 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11179e-07 ( -4.0445e-08  4.51928e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.460 sec. to    1.460 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46927     ( -0.289956   0.284918 )
Norm@50keV  : 5.02423E-03    ( -0.000951835   0.000944051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.46 using 59 PHA bins.
# Reduced chi-squared =         0.7975 for     57 degrees of freedom 
# Null hypothesis probability =   8.643740e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.622185 ( -0.113558  0.113687 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.79215e-08 ( -9.82457e-09  1.00454e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.460 sec. to    1.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.910113     ( -1.66259   2.47109 )
Epeak [keV] : 55.3017      ( -10.5256 28.7481 )
Norm@50keV  : 9.61538E-02    ( -0.0976003   1.86844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.60 using 59 PHA bins.
# Reduced chi-squared =         0.6893 for     56 degrees of freedom 
# Null hypothesis probability =   9.631827e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.576197 ( -0.115246  0.117002 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.97137e-08 ( -9.20877e-09  1.08001e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 15.984 sec.
Hardness ratio (energy fluence ratio) = 1.04431156757

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

S(15-50 keV)  = 1.1737713e-07
S(50-150 keV) = 1.1509112e-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 = -2.278559744226316E-01, IMY = -8.903192481110719E-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:
-239.992000 -1.544000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 39.5332 -17.6500    2.2  27.1  129.6   1.1343   5.2 ------	UNKNOWN                       
 31.5338 -10.0684    2.5  18.7  111.5   0.8195   4.7 ------	UNKNOWN                       
  3.5372 -34.2607    2.2  24.9 -140.5   0.8850   5.2 ------	UNKNOWN

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

Time interval of the image:
-1.544000 17.528000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 22.4871 -20.5670    0.9  13.7  158.7   0.4852  12.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
63.108590 962.143000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  9.2687 -35.4619    2.8  18.9 -139.7   1.5638   4.1 ------	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