GRB050215B

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: Thu Sep 11 20:10:29 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger106107
======================================================================

  Trigger: 00106107      Segment: 000

  BAT Trigger Time: 130127622.592   [s; MET]
      Trigger Stop: 130127624.64   [s; MET]
               UTC: 2005-02-15T02:33:43.199080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 174.439240209498   Dec: 40.7963490256769  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     13.2664991614216  [ if not an image trigger ]
     Image S/N Ratio:    8

  Analysis Position:   [ source = BAT ]
    RA: 174.439240209498   Dec: 40.7963490256769  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 174.47731727625   Dec: 40.7924461290538  [deg; J2000]  
        { 11h 37m 54.6s , +40d 47' 32.8" }
         +/- 1.75307374839531 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.715784812233141 [arcmin] (formal 1-sigma fit error)
    SNR: 13.6405662562158
 
  Angular difference between the analysis and refined position is 1.745376 arcmin
 
  Partial Coding Fraction: 0.8359375    [ including projection effects ]

  Duration
     T90: 11.0439999997616 +/- 3.93113214071415
        Measured from: -1.53199999034405
                   to: 9.51200000941753     [s; relative to TRIGTIME]
     T50: 4.94000001251698 +/- 1.65830274293752
        Measured from: -0.0319999903440475
                   to: 4.90800002217293     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.80799999833107     
                   to: 0.19200000166893     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.07199999690056     
                   to: 13.3680000007153     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.227406   0.177324   0.079327   0.000789
           0.018923   0.019683   0.016980   0.014573 [error]
 Peak      0.020362   0.037140   0.021456   0.003177
           0.004865   0.005123   0.004606   0.003729 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   15.440   -2.072   13.368
T90    11.044   -1.532    9.512
T50     4.940   -0.032    4.908
Peak    1.000   -0.808    0.192
 
 
====== 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      -2.253    -0.253      0.233       -           -               -         1.60e-03     -2.86e-04          2.80e-04      62.030   57
CPL     -1.955     N/A        N/A           5.607      N/A           N/A         2.46e-03        N/A               N/A         61.610   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      -1.503     -0.286     0.279       -           -               -         5.34e-03     -9.95e-04          9.84e-04      51.440   57
CPL      0.024     -1.319     1.949       60.512     -15.005        90.074      3.58e-02     -3.58e-02          3.79e-01      47.380   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   6.44e-08  7.51e-08  6.31e-08  8.94e-08  2.35e-07  2.92e-07   erg/cm2
      90%_error_low -9.53e-09 -9.43e-09 -1.49e-08 -3.50e-08 -3.43e-08 -5.61e-08   erg/cm2
      90%_error_hi   9.66e-09  9.28e-09  1.57e-08  4.79e-08  3.55e-08  6.62e-08   erg/cm2
Peak flux       PL   2.20e-01  2.21e-01  1.56e-01  1.75e-01  6.67e-01  7.73e-01   ph/cm2/s
      90%_error_low -5.85e-02 -4.05e-02 -3.59e-02 -6.75e-02 -1.18e-01 -1.40e-01   ph/cm2/s
      90%_error_hi   6.23e-02  4.02e-02  3.58e-02  8.86e-02  1.18e-01  1.42e-01   ph/cm2/s
 
Fluence        CPL   6.35e-08  7.82e-08  6.00e-08  4.25e-08  2.25e-07  2.43e-07   erg/cm2
      90%_error_low -1.01e-08 -9.78e-09 -2.02e-08 -3.63e-08    N/A    -5.73e-08   erg/cm2
      90%_error_hi   9.60e-09  1.28e-08  1.76e-08  7.92e-08    N/A     9.44e-08   erg/cm2
Peak flux      CPL   1.80e-01  2.61e-01  1.64e-01  3.84e-02  6.37e-01  6.44e-01   ph/cm2/s
      90%_error_low -6.88e-02 -5.39e-02 -4.73e-02 -3.84e-02 -1.21e-01 -1.26e-01   ph/cm2/s
      90%_error_hi   7.18e-02  5.80e-02  4.42e-02  1.00e-01  1.21e-01  1.40e-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
  174.4773    40.7924   0.0142    23.9026    21.1757         0.5087080     13.641 TRIG_00106107                 
 
Foreground time interval of the image:
 -2.072  13.368 (delta_t =  15.440 [sec])
Background time interval of the image:
-71.691  -2.072 (delta_t =  69.619 [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   -2.072 sec. to   13.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.25266     ( -0.253264   0.232662 )
Norm@50keV  : 1.60335E-03    ( -0.000285953   0.000280015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.03 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.016630e-01
 
Photon flux (15-150 keV)    in 15.44 sec: 0.273038 ( -0.031287  0.031288 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34676e-07 ( -3.42712e-08  3.55131e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.072 sec. to   13.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.95486     (       )
Epeak [keV] : 5.60699      (   )
Norm@50keV  : 2.46292E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.61 using 59 PHA bins.
# Reduced chi-squared =          1.100 for     56 degrees of freedom 
# Null hypothesis probability =   2.822200e-01
 
Photon flux (15-150 keV)    in 15.44 sec: 0.269821 ( -0.032293  0.031371 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.2465e-07 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.808 sec. to    0.192 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50314     ( -0.286005   0.279322 )
Norm@50keV  : 5.33653E-03    ( -0.000994831   0.000983877 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.44 using 59 PHA bins.
# Reduced chi-squared =         0.9025 for     57 degrees of freedom 
# Null hypothesis probability =   6.827396e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.666788 ( -0.118212  0.118298 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.06058e-08 ( -1.01752e-08  1.03886e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.808 sec. to    0.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0243187     ( -1.32297   1.9453 )
Epeak [keV] : 60.5124      ( -14.9381 90.1403 )
Norm@50keV  : 3.58101E-02    ( -0.0360394   0.378404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.38 using 59 PHA bins.
# Reduced chi-squared =         0.8460 for     56 degrees of freedom 
# Null hypothesis probability =   7.872613e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.636557 ( -0.121102  0.121387 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45923e-08 ( -1.05758e-08  1.15526e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 11.044 sec.
Hardness ratio (energy fluence ratio) = 0.839402110934

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

S(15-50 keV)  = 1.3954571e-07
S(50-150 keV) = 9.513339e-08

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 = 4.132681404292561E-01, IMY = -1.600943001734747E-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:
-71.691400 -2.072000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6245  22.0103    1.2  53.6 -177.7   2.0880   9.5    0.5	Crab                          
229.7768  45.2144    3.2  55.6  -20.3   0.9095   3.6 ------	UNKNOWN

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

Time interval of the image:
-2.072000 13.368000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6268  22.1477    5.7  53.5 -177.6  -0.2258  -2.0    8.0	Crab                          
174.4773  40.7925    0.8  23.9   21.2   0.5088  13.6 ------	UNKNOWN                       
 94.4224  26.1746    2.0  43.7  176.7   0.3515   5.7 ------	UNKNOWN                       
 73.5283  27.9127    2.0  55.9 -164.6   0.7635   5.7 ------	UNKNOWN                       
110.7233  74.7632    2.2  28.2  -96.0   0.2814   5.3 ------	UNKNOWN                       
 69.9124  35.7603    2.3  53.0 -154.9   0.5475   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
86.108600 242.608000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
115.1802  40.9441    2.2  43.9  154.6   0.4629   5.2 ------	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