GRB050915B

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 20:13:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger155284
======================================================================

  Trigger: 00155284      Segment: 000

  BAT Trigger Time: 148512184   [s; MET]
      Trigger Stop: 148512248   [s; MET]
               UTC: 2005-09-15T21:23:04.269060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 219.095807718615   Dec: -67.4048403823788  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    23.35
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    23.35

  Analysis Position:   [ source = BAT ]
    RA: 219.095807718615   Dec: -67.4048403823788  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 219.120523734458   Dec: -67.4058125131395  [deg; J2000]  
        { 14h 36m 28.9s , -67d 24' 20.9" }
         +/- 0.761278136392281 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.273531630923196 [arcmin] (formal 1-sigma fit error)
    SNR: 44.9099069674404
 
  Angular difference between the analysis and refined position is 0.572745 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 43.0960000157356 +/- 4.40570765213235
        Measured from: -4.2960000038147
                   to: 38.8000000119209     [s; relative to TRIGTIME]
     T50: 21.3000000119209 +/- 1.19930647318383
        Measured from: 2.40000000596046
                   to: 23.7000000178814     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -3.07600000500679     
                   to: -2.07600000500679     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.1240000128746     
                   to: 56.9160000085831     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.134346   2.491964   1.430887   0.247331
           0.058932   0.060111   0.050218   0.040690 [error]
 Peak      0.080557   0.103552   0.073325   0.018130
           0.007934   0.008300   0.007200   0.005277 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   66.040   -9.124   56.916
T90    43.096   -4.296   38.800
T50    21.300    2.400   23.700
Peak    1.000   -3.076   -2.076
 
 
====== 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: CPL)
 
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      -1.887    -0.062      0.062       -           -               -         5.86e-03     -1.98e-04          1.98e-04      73.620   57
CPL     -1.374    -0.265      0.282       59.441      -7.268        14.634      1.06e-02     -2.76e-03          4.05e-03      62.110   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      -1.597     -0.155     0.152       -           -               -         1.78e-02     -1.63e-03          1.61e-03      44.920   57
CPL     -1.353     -0.376     0.648      130.513     -63.866      -130.513      2.38e-02     -1.44e-02          2.67e-02      44.400   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   7.12e-07  1.03e-06  1.12e-06  2.26e-06  3.56e-06  5.12e-06   erg/cm2
      90%_error_low -4.01e-08 -3.45e-08 -5.13e-08 -2.16e-07 -1.20e-07 -2.57e-07   erg/cm2
      90%_error_hi   4.09e-08  3.44e-08  5.13e-08  2.31e-07  1.20e-07  2.68e-07   erg/cm2
Peak flux       PL   8.06e-01  7.66e-01  5.06e-01  5.20e-01  2.29e+00  2.60e+00   ph/cm2/s
      90%_error_low -1.15e-01 -6.96e-02 -5.91e-02 -1.14e-01 -2.02e-01 -2.26e-01   ph/cm2/s
      90%_error_hi   1.20e-01  6.92e-02  5.86e-02  1.31e-01  2.02e-01  2.27e-01   ph/cm2/s
 
Fluence        CPL   6.47e-07  1.08e-06  1.13e-06  1.11e-06  3.40e-06  3.97e-06   erg/cm2
      90%_error_low -5.01e-08 -4.06e-08 -5.49e-08 -3.11e-07 -1.43e-07 -3.47e-07   erg/cm2
      90%_error_hi   5.11e-08  4.10e-08  5.51e-08  4.57e-07  1.43e-07  4.79e-07   erg/cm2
Peak flux      CPL   7.73e-01  7.84e-01  5.16e-01  3.88e-01  2.27e+00  2.46e+00   ph/cm2/s
      90%_error_low -1.38e-01 -8.07e-02 -6.34e-02 -1.92e-01 -2.10e-01 -2.99e-01   ph/cm2/s
      90%_error_hi   1.34e-01  8.41e-02  6.50e-02  1.70e-01  2.10e-01  3.35e-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
  219.1205   -67.4058   0.0043    24.5428    88.2863         6.1487488     44.910 TRIG_00155284                 
 
Foreground time interval of the image:
 -4.499  56.916 (delta_t =  61.415 [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   -9.124 sec. to   56.916 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88667     ( -0.0620983   0.0615787 )
Norm@50keV  : 5.86294E-03    ( -0.000198396   0.000197766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.62 using 59 PHA bins.
# Reduced chi-squared =          1.292 for     57 degrees of freedom 
# Null hypothesis probability =   6.841046e-02
 
Photon flux (15-150 keV)    in 66.04 sec: 0.836722 ( -0.029241  0.029349 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.55998e-06 ( -1.19831e-07  1.20269e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -9.124 sec. to   56.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37401     ( -0.26462   0.281655 )
Epeak [keV] : 59.4409      ( -7.26838 14.634 )
Norm@50keV  : 1.06394E-02    ( -0.00275936   0.00404717 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.11 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     56 degrees of freedom 
# Null hypothesis probability =   2.676335e-01
 
Photon flux (15-150 keV)    in 66.04 sec: 0.805040 ( -0.032896  0.033049 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.4039e-06 ( -1.42553e-07  1.42821e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -3.076 sec. to   -2.076 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.597     ( -0.154924   0.15216 )
Norm@50keV  : 1.78329E-02    ( -0.00162712   0.00161383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.92 using 59 PHA bins.
# Reduced chi-squared =         0.7881 for     57 degrees of freedom 
# Null hypothesis probability =   8.767827e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.28956 ( -0.2017  0.20194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66859e-07 ( -1.63127e-08  1.64779e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -3.076 sec. to   -2.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3525     ( -0.376383   0.647505 )
Epeak [keV] : 130.513      ( -63.8668 -130.513 )
Norm@50keV  : 2.38185E-02    ( -0.0144294   0.0267058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.40 using 59 PHA bins.
# Reduced chi-squared =         0.7929 for     56 degrees of freedom 
# Null hypothesis probability =   8.682127e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.26524 ( -0.21015  0.20954 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.63817e-07 ( -1.80632e-08  1.79019e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 43.096 sec.
Hardness ratio (energy fluence ratio) = 1.05470288789

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

S(15-50 keV)  = 1.7225606e-06
S(50-150 keV) = 1.6813926e-06

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 = 1.365583999024523E-02,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image:

Pre-slew

 Time interval of the image: -4.499400 56.916000

# RAcent #  [deg] 135.3739 -40.4191 170.2887 -60.6877 186.6179 -62.7758 219.1197 -67.4057 229.2329 -46.5561 234.0319 -10.7076 138.0279 -18.6523

Post-slew

 Time interval of the image: 120.100600 303.110400

# RAcent #  [deg] 135.3124 -40.5473 170.1575 -60.4847 186.6683 -62.7635 244.9972 -15.6400 255.8251 -37.8619 256.5857 -36.4286 262.9038 -24.6680 264.7262 -44.4876 270.3951 -25.0750 270.2468 -25.7033 275.9226 -30.2384 263.0707 -33.7577 253.4647 -39.8573 96.5255 -50.9032 98.4139 -47.3433 163.7184 -36.0127

IMY = -4.564246376089915E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.0 36.9 -158.9 -0.0409 -0.3 10.8 Vela X-1 49.7 15.1 150.4 0.0217 0.2 4.0 Cen X-3 0.8 13.9 118.5 1.2732 14.5 1.1 GX 301-2 0.3 24.5 88.3 6.1477 44.9 ------ UNKNOWN 2.7 28.1 39.2 0.4929 4.3 ------ UNKNOWN 2.6 54.5 -0.3 1.5517 4.5 ------ UNKNOWN 2.4 49.5 -132.4 2.1433 4.9 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 25.9 50.8 -146.0 0.2071 0.4 9.9 Vela X-1 6.9 21.9 -138.6 0.2508 1.7 9.5 Cen X-3 0.5 14.2 -129.6 3.3581 24.2 0.5 GX 301-2 1.3 54.4 -11.9 4.2413 9.2 1.0 Sco X-1 6.3 35.9 10.5 -0.3428 -1.8 7.7 4U 1700-377 7.5 37.5 10.5 0.3080 1.5 7.3 GX 349+2 15.0 50.4 11.7 0.3212 0.8 7.4 GX 1+4 4.4 33.0 26.4 0.4890 2.6 2.4 4U 1735-44 16.7 52.5 20.0 0.4419 0.7 6.0 GX 5-1 9.0 51.9 20.1 0.7645 1.3 3.8 GRS 1758-258 10.7 49.7 28.4 0.6425 1.1 7.7 H1820-303 2.8 42.0 16.5 1.0088 4.2 6.2 GX 354-0 1.9 33.4 8.9 1.1048 6.0 ------ UNKNOWN 2.8 54.1 177.9 2.1008 4.1 ------ UNKNOWN 3.5 56.9 -179.0 2.6827 3.3 ------ UNKNOWN 3.0 44.0 -116.5 2.3837 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

Pre-burst Time interval of the image:

Pre-slew Time interval of the image: -4.499400 56.916000 # RAcent # [deg] 135.3739 -40.4191 170.2887 -60.6877 186.6179 -62.7758 219.1197 -67.4057 229.2329 -46.5561 234.0319 -10.7076 138.0279 -18.6523

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

Pre-burst
Time interval of the image:

Pre-slew
Time interval of the image: -4.499400 56.916000 # RAcent # [deg] 135.3739 -40.4191 170.2887 -60.6877 186.6179 -62.7758 219.1197 -67.4057 229.2329 -46.5561 234.0319 -10.7076 138.0279 -18.6523