GRB090309A

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 May 13 00:02:09 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger345945
======================================================================

  Trigger: 00345945      Segment: 000

  BAT Trigger Time: 258334157.824   [s; MET]
      Trigger Stop: 258334158.848   [s; MET]
               UTC: 2009-03-09T23:29:13.262340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 284.980772926882   Dec: -25.2643001528138  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.07
     Image Trigger?:     NO
     Rate S/N Ratio:     11.5758369027902  [ if not an image trigger ]
     Image S/N Ratio:    7.07

  Analysis Position:   [ source = BAT ]
    RA: 284.980772926882   Dec: -25.2643001528138  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 284.982622474703   Dec: -25.277803005186  [deg; J2000]  
        { 18h 59m 55.8s , -25d 16' 40.1" }
         +/- 2.28034274340809 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.855660385132764 [arcmin] (formal 1-sigma fit error)
    SNR: 9.36892205598464
 
  Angular difference between the analysis and refined position is 0.816363 arcmin
 
  Partial Coding Fraction: 0.6171875    [ including projection effects ]

  Duration
     T90: 3 +/- 1.4142135623731
        Measured from: -0.824000000953674
                   to: 2.17599999904633     [s; relative to TRIGTIME]
     T50: 1 +/- 1
        Measured from: 0.175999999046326
                   to: 1.17599999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.175999999046326     
                   to: 1.17599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.824000000953674     
                   to: 2.17599999904633     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.041139   0.078908   0.060673   0.033579
           0.013384   0.012608   0.010978   0.010110 [error]
 Peak      0.016924   0.046441   0.028723   0.018669
           0.007965   0.007673   0.006570   0.005968 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.000   -0.824    2.176
T90     3.000   -0.824    2.176
T50     1.000    0.176    1.176
Peak    1.000    0.176    1.176
 
 
====== 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      -1.306    -0.328      0.338       -           -               -         4.61e-03     -8.09e-04          8.08e-04      41.360   57
CPL     -1.308    -1.283      1.082     9999.340      N/A           N/A         4.62e-03        N/A               N/A         41.360   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      -1.433     -0.356     0.357       -           -               -         7.28e-03     -1.46e-03          1.45e-03      71.640   57
CPL     -0.234     -1.501     4.474       71.760     -23.734       -71.760      2.95e-02     -2.95e-02          4.56e+00      70.910   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   1.47e-08  3.05e-08  4.93e-08  1.79e-07  1.37e-07  2.74e-07   erg/cm2
      90%_error_low -4.82e-09 -6.23e-09 -1.08e-08 -7.47e-08 -2.64e-08 -8.33e-08   erg/cm2
      90%_error_hi   5.33e-09  6.04e-09  1.06e-08  1.08e-07  2.68e-08  1.12e-07   erg/cm2
Peak flux       PL   2.81e-01  2.94e-01  2.18e-01  2.60e-01  8.93e-01  1.05e+00   ph/cm2/s
      90%_error_low -9.59e-02 -6.56e-02 -5.37e-02 -1.13e-01 -1.82e-01 -2.11e-01   ph/cm2/s
      90%_error_hi   1.07e-01  6.42e-02  5.29e-02  1.58e-01  1.83e-01  2.13e-01   ph/cm2/s
 
Fluence        CPL   1.49e-08  3.03e-08  4.88e-08  1.90e-07  1.38e-07  2.62e-07   erg/cm2
      90%_error_low    N/A    -6.32e-09 -1.30e-08 -1.53e-07 -3.42e-08 -1.33e-07   erg/cm2
      90%_error_hi     N/A     7.06e-09  1.45e-08  4.34e-09  2.19e-08  1.17e-07   erg/cm2
Peak flux      CPL   2.22e-01  3.24e-01  2.30e-01  7.79e-02  8.34e-01  8.58e-01   ph/cm2/s
      90%_error_low -2.22e-01 -8.52e-02 -6.45e-02 -7.79e-02 -2.35e-01 -2.59e-01   ph/cm2/s
      90%_error_hi   1.49e-01  9.37e-02  6.33e-02  2.18e-01  2.17e-01  2.24e-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
  284.9826   -25.2778   0.0205    24.6667   -92.9612         0.2295110      9.369 TRIG_00345945                 
 
Foreground time interval of the image:
 -0.824   2.176 (delta_t =   3.000 [sec])
Background time interval of the image:
-530.623 -493.713 (delta_t =  36.910 [sec])
-239.824  -0.824 (delta_t = 239.000 [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   -0.824 sec. to    2.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30577     ( -0.328298   0.337747 )
Norm@50keV  : 4.61142E-03    ( -0.000808615   0.000807891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.36 using 59 PHA bins.
# Reduced chi-squared =         0.7256 for     57 degrees of freedom 
# Null hypothesis probability =   9.408054e-01
 
Photon flux (15-150 keV)    in 3 sec: 0.550750 ( -0.100746  0.101312 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.36531e-07 ( -2.63716e-08  2.67597e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.824 sec. to    2.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.47507     ( -0.116084   2.24891 )
Epeak [keV] : 155.833      (   )
Norm@50keV  : 1.01926E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.04 using 59 PHA bins.
# Reduced chi-squared =         0.7329 for     56 degrees of freedom 
# Null hypothesis probability =   9.330720e-01
 
Photon flux (15-150 keV)    in 3 sec: 0.555604 ( -0.124405  0.114068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38106e-07 ( -3.4173e-08  2.18801e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.176 sec. to    1.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43346     ( -0.355693   0.35699 )
Norm@50keV  : 7.27682E-03    ( -0.00145737   0.00145068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.64 using 59 PHA bins.
# Reduced chi-squared =          1.257 for     57 degrees of freedom 
# Null hypothesis probability =   9.173337e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.893166 ( -0.182336  0.183374 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.98586e-08 ( -1.51872e-08  1.54573e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.176 sec. to    1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.233635     ( -1.5228   4.45243 )
Epeak [keV] : 71.7597      ( -22.973 -70.999 )
Norm@50keV  : 2.94637E-02    ( -0.0312145   4.55409 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.91 using 59 PHA bins.
# Reduced chi-squared =          1.266 for     56 degrees of freedom 
# Null hypothesis probability =   8.658574e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.833747 ( -0.235143  0.216503 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.21956e-08 ( -1.95858e-08  2.07455e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 3.0 sec.
Hardness ratio (energy fluence ratio) = 1.61804242858

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

S(15-50 keV)  = 4.521674e-08
S(50-150 keV) = 9.131475e-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 = -2.372420022187639E-02,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -530.623390 -493.713500 -239.824000 -0.824000

# RAcent #  [deg] 244.9847 -15.6414 256.0356 -37.8392 256.6187 -36.4360 262.8669 -24.7116 264.7332 -44.4607 268.4149  -1.4529 270.2604 -25.1417 270.2828 -25.7019 273.9654 -14.0647 275.9790 -30.2807 284.8512 -24.8043 288.8195  10.9040 263.1547 -33.8252 255.6566 -48.8179 266.3549  30.4418 277.4108 -23.7352

Pre-slew

 Time interval of the image: -0.824000 2.176000

# RAcent #  [deg] 244.8734 -15.7143 256.1556 -37.9997 256.3611 -36.5585 262.9529 -24.8325 264.6350 -44.3018 268.5041  -1.6106 270.3539 -25.2253 270.1382 -25.8388 274.0059 -14.0360 275.7987 -30.5206 285.1790 -24.7667 288.9034  10.8639 263.1750 -33.6894 317.8854 -81.6741

Post-slew

 Time interval of the image: 63.676600 855.476590

# RAcent #  [deg] 244.9961 -15.6376 255.9739 -37.7963 256.4314 -36.3566 263.0514 -24.6404 264.9433 -44.4286 268.4129  -1.4515 270.2736 -25.1351 270.4700 -25.8005 274.0138 -14.0329 275.9489 -30.2438 285.1010 -24.9764 288.8049  10.9246 262.9782 -33.8453 293.0685 -46.5519 296.2178 -11.7049 304.2121  17.5524 340.6517 -40.5120 314.3968  16.8845

IMY = 4.586306671253991E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.3 16.4 127.8 10.5688 45.9 0.3 Sco X-1 1.7 10.7 1.7 1.5435 7.0 2.3 4U 1700-377 4.4 9.2 -0.2 0.6013 2.6 8.9 GX 349+2 7.8 5.4 -121.3 0.3467 1.5 8.0 GX 1+4 13.9 18.2 -21.4 0.1968 0.8 0.8 4U 1735-44 3.5 27.8 -160.7 0.7678 3.3 2.8 SW J1753.5-0127 4.5 11.6 -102.2 0.5950 2.6 4.0 GX 5-1 3.7 11.5 -99.5 0.8299 3.6 2.7 GRS 1758-258 1.8 20.2 -132.0 1.5950 6.4 2.9 GX 17+2 5.6 16.5 -79.7 0.4881 2.1 5.9 H1820-303 0.0 24.6 -94.1 -0.2220 -0.7 12.2 HT1900.1-2455 2.8 48.8 -141.9 2.7832 4.2 2.8 GRS 1915+105 11.5 8.2 -39.7 0.2233 1.0 8.3 GX 354-0 1.8 21.6 -1.3 1.5191 6.5 ------ UNKNOWN 2.4 58.3 -175.7 6.6839 4.8 ------ UNKNOWN 2.2 18.3 -101.3 1.2967 5.3 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.8 16.5 127.3 0.0400 2.0 7.6 Sco X-1 4.1 10.8 1.1 -0.0505 -2.8 12.3 4U 1700-377 10.7 9.4 1.1 -0.0194 -1.1 8.9 GX 349+2 11.0 5.5 -119.8 -0.0189 -1.0 6.0 GX 1+4 8.5 18.0 -21.3 -0.0238 -1.3 10.0 4U 1735-44 0.0 27.7 -160.4 0.0054 0.3 12.5 SW J1753.5-0127 3.9 11.7 -101.7 -0.0553 -2.9 9.6 GX 5-1 22.4 11.4 -98.9 0.0098 0.5 10.6 GRS 1758-258 170.0 20.3 -132.0 0.0013 0.1 0.0 GX 17+2 15.2 16.3 -78.8 0.0148 0.8 11.3 H1820-303 0.0 24.9 -94.1 -0.0316 -1.3 12.1 HT1900.1-2455 6.6 48.8 -141.8 0.0960 1.8 7.9 GRS 1915+105 0.0 8.1 -40.4 -0.0403 -2.3 12.7 GX 354-0 2.5 58.9 -13.1 0.5543 4.6 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 1.0 38.5 103.8 8.4799 11.1 1.0 Sco X-1 1.6 27.5 63.1 2.1752 7.4 2.9 4U 1700-377 4.0 26.8 65.9 0.8298 2.9 4.0 GX 349+2 4.9 19.9 94.4 0.5775 2.4 6.7 GX 1+4 4.6 25.1 42.4 0.5635 2.5 8.7 4U 1735-44 2.3 28.7 150.8 1.2861 5.0 2.7 SW J1753.5-0127 4.5 13.3 94.7 0.4792 2.6 3.4 GX 5-1 5.0 13.1 91.8 -0.4317 -2.3 9.7 GRS 1758-258 1.6 15.2 142.7 1.5498 7.1 0.5 GX 17+2 4.5 9.4 63.3 0.5087 2.5 7.5 H1820-303 3.4 0.3 -150.4 0.6731 3.4 4.9 HT1900.1-2455 0.9 36.4 -166.4 3.1046 12.3 1.3 GRS 1915+105 178.5 20.9 67.9 -0.0159 -0.1 0.8 GX 354-0 4.1 22.2 -7.6 0.6007 2.8 ------ UNKNOWN 2.8 17.2 -132.6 0.8840 4.1 ------ UNKNOWN 3.3 46.8 -147.2 1.5061 3.5 ------ UNKNOWN 3.0 48.3 -50.0 5.2826 3.8 ------ UNKNOWN 4.0 51.0 -135.5 3.6403 2.9 ------ 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

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