GRB050509B

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: Wed Jan 22 22:02:34 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger118749
======================================================================

  Trigger: 00118749      Segment: 000

  BAT Trigger Time: 137304018.752   [s; MET]
      Trigger Stop: 137304018.88   [s; MET]
               UTC: 2005-05-09T04:00:19.237760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 189.055782430247   Dec: 29.000309642558  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6
     Image Trigger?:     NO
     Rate S/N Ratio:     9.59166304662544  [ if not an image trigger ]
     Image S/N Ratio:    6

  Analysis Position:   [ source = BAT ]
    RA: 189.055782430247   Dec: 29.000309642558  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 189.120476300044   Dec: 29.0014195744892  [deg; J2000]  
        { 12h 36m 28.9s , +29d 00' 05.1" }
         +/- 2.46718891236298 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.43957963061827 [arcmin] (formal 1-sigma fit error)
    SNR: 8.37200020885544
 
  Angular difference between the analysis and refined position is 3.395577 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.0240000188350677 +/- 0.00894426338008669
        Measured from: 0
                   to: 0.0240000188350677     [s; relative to TRIGTIME]
     T50: 0.0120000243186951 +/- 0.00565684464005017
        Measured from: 0.00799998641014099
                   to: 0.0200000107288361     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.483999997377396     
                   to: 0.516000002622604     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.0279999971389771     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.002447   0.005965   0.004142   0.002705
           0.000937   0.001119   0.001079   0.000721 [error]
 Peak      0.003011   0.008137   0.009532   0.003013
           0.004477   0.004761   0.003993   0.003298 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.028    0.000    0.028
T90     0.024    0.000    0.024
T50     0.012    0.008    0.020
Peak    1.000   -0.484    0.516
 
 
====== 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      -1.275    -0.399      0.405       -           -               -         2.56e-02     -6.59e-03          6.56e-03      55.540   57
CPL      2.192    -2.716      6.743       58.851     -10.600        39.935      1.45e+00     -1.45e+00          1.54e+03      50.450   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      -0.960     -1.005     1.477       -           -               -         1.66e-03     -1.66e-03          8.45e-04      39.120   57
CPL     -0.977      0.977     4.038     9999.350      N/A           N/A         1.67e-03        N/A               N/A         39.130   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   7.42e-10  1.56e-09  2.58e-09  9.68e-09  7.13e-09  1.46e-08   erg/cm2
      90%_error_low -2.92e-10 -4.26e-10 -8.07e-10 -4.99e-09 -2.02e-09 -5.86e-09   erg/cm2
      90%_error_hi   3.20e-10  4.20e-10  8.04e-10  7.71e-09  2.07e-09  8.13e-09   erg/cm2
Peak flux       PL   4.08e-02  5.66e-02  5.82e-02  1.09e-01  1.90e-01  2.65e-01   ph/cm2/s
      90%_error_low -4.08e-02 -5.66e-02 -5.82e-02 -1.09e-01 -1.90e-01 -1.36e-01   ph/cm2/s
      90%_error_hi   5.49e-02  3.72e-02  3.03e-02  7.82e-01  1.01e-01  2.10e-01   ph/cm2/s
 
Fluence        CPL   3.89e-10  2.16e-09  2.88e-09  4.55e-10  5.85e-09  5.88e-09   erg/cm2
      90%_error_low -3.20e-10 -6.55e-10 -1.01e-09 -4.24e-10 -1.62e-09 -1.65e-09   erg/cm2
      90%_error_hi   4.23e-10  7.04e-10  1.01e-09  3.18e-09  2.01e-09  3.24e-09   erg/cm2
Peak flux      CPL   4.52e-02  5.73e-02  5.74e-02  1.11e-01  1.93e-01  2.66e-01   ph/cm2/s
      90%_error_low     N/A   -5.73e-02     N/A       N/A   -1.93e-01 -1.66e-01   ph/cm2/s
      90%_error_hi      N/A    1.97e-02     N/A       N/A    1.13e-01  2.04e-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
  189.1205    29.0014   0.0229     7.9627   -46.5137         0.0159783      8.372 TRIG_00118749                 
 
Foreground time interval of the image:
  0.000   0.028 (delta_t =   0.028 [sec])
Background time interval of the image:
-299.752   0.000 (delta_t = 299.752 [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    0.000 sec. to    0.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27542     ( -0.399023   0.405249 )
Norm@50keV  : 2.55981E-02    ( -0.00658928   0.00656488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.54 using 59 PHA bins.
# Reduced chi-squared =         0.9743 for     57 degrees of freedom 
# Null hypothesis probability =   5.300914e-01
 
Photon flux (15-150 keV)    in 0.028 sec: 3.04061 ( -0.7795  0.78076 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.12636e-09 ( -2.01699e-09  2.06898e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    0.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.4746     ( -2.76842   6.69051 )
Epeak [keV] : 58.0686      ( -9.9492 40.5865 )
Norm@50keV  : 1.97798    ( -2.07402   1544.08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.43 using 59 PHA bins.
# Reduced chi-squared =         0.9005 for     56 degrees of freedom 
# Null hypothesis probability =   6.848796e-01
 
Photon flux (15-150 keV)    in 0.028 sec: 2.76626 ( -0.78964  0.80797 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.84881e-09 ( -1.62312e-09  2.01292e-09 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.484 sec. to    0.516 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.960004     ( -1.00524   1.47726 )
Norm@50keV  : 1.65738E-03    ( -0.00165737   0.000845336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.12 using 59 PHA bins.
# Reduced chi-squared =         0.6863 for     57 degrees of freedom 
# Null hypothesis probability =   9.661161e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.190476 ( -0.190476  0.101144 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81849e-08 ( -9.61709e-09  9.80491e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.484 sec. to    0.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -5.12871     ( 9.99768   13.0578 )
Epeak [keV] : 575.715      (   )
Norm@50keV  : 1.60219E-05    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.90 using 59 PHA bins.
# Reduced chi-squared =         0.6768 for     56 degrees of freedom 
# Null hypothesis probability =   9.696009e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.193499 ( -0.193499  0.112667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81823e-08 ( -7.02883e-09  6.48434e-09 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.02400002 sec.
Hardness ratio (energy fluence ratio) = 1.65218989323

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

S(15-50 keV)  = 2.3064098e-09
S(50-150 keV) = 4.820058e-09

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 = 9.626120033947863E-02, IMY = 1.014867399437389E-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:
-299.752000 0.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
201.2637  36.7268    2.6  19.2  -17.8   0.7126   4.5 ------	UNKNOWN                       
132.7852   8.0696    3.3  55.2 -145.3   4.4709   3.6 ------	UNKNOWN

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

Time interval of the image:
0.000000 0.028000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
216.5109   5.1121    2.6  31.5   66.1   0.0154   4.4 ------	UNKNOWN                       
189.1205  29.0014    1.4   8.0  -46.5   0.0160   8.4 ------	UNKNOWN                       
221.6468  49.0151    2.3  38.4  -15.1   0.0137   5.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
36.748600 302.261800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
139.8005  -6.2636    3.5  59.0 -166.1   3.8537   3.3 ------	UNKNOWN                       
153.6555  58.2780    3.0  38.1  -77.2   1.8333   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

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