GRB090927

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: Sun Jan 19 13:53:10 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger370846
======================================================================

  Trigger: 00370846      Segment: 000

  BAT Trigger Time: 275738842.048   [s; MET]
      Trigger Stop: 275738842.56   [s; MET]
               UTC: 2009-09-27T10:07:16.926760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 343.953096034345   Dec: -70.9775664473784  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.42
     Image Trigger?:     NO
     Rate S/N Ratio:     25.8263431402899  [ if not an image trigger ]
     Image S/N Ratio:    11.42

  Analysis Position:   [ source = BAT ]
    RA: 343.953096034345   Dec: -70.9775664473784  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 343.928634147261   Dec: -70.9731494448479  [deg; J2000]  
        { 22h 55m 42.9s , -70d 58' 23.3" }
         +/- 1.5813548988806 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.719989397380717 [arcmin] (formal 1-sigma fit error)
    SNR: 15.804863141897
 
  Angular difference between the analysis and refined position is 0.546935 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 2.1599999666214 +/- 0.400898948808123
        Measured from: 0.10400003194809
                   to: 2.26399999856949     [s; relative to TRIGTIME]
     T50: 0.807999968528748 +/- 0.31346449706629
        Measured from: 0.319999992847443
                   to: 1.12799996137619     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0079999566078186     
                   to: 0.992000043392181     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0240000486373901     
                   to: 2.43999999761581     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.102704   0.141373   0.081110   0.014561
           0.012102   0.012570   0.011264   0.011032 [error]
 Peak      0.065043   0.096346   0.051847   0.007888
           0.008167   0.008866   0.007982   0.007438 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    2.416    0.024    2.440
T90     2.160    0.104    2.264
T50     0.808    0.320    1.128
Peak    1.000   -0.008    0.992
 
 
====== 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: 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      -1.796    -0.202      0.193       -           -               -         8.89e-03     -1.14e-03          1.11e-03      78.920   57
CPL     -1.301    -0.412      0.883       61.952     -19.123       -61.952      1.68e-02     -1.04e-02          3.55e-02      77.600   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      -1.713     -0.203     0.195       -           -               -         1.42e-02     -1.88e-03          1.85e-03      72.460   57
CPL     -0.670     -0.878     1.163       55.136     -12.027        63.343      5.50e-02     -5.50e-02          1.99e-01      68.200   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   3.62e-08  5.56e-08  6.41e-08  1.41e-07  1.98e-07  2.97e-07   erg/cm2
      90%_error_low -5.67e-09 -5.94e-09 -1.10e-08 -4.38e-08 -2.55e-08 -5.60e-08   erg/cm2
      90%_error_hi   5.84e-09  5.93e-09  1.12e-08  5.54e-08  2.60e-08  6.54e-08   erg/cm2
Peak flux       PL   7.17e-01  6.37e-01  3.89e-01  3.59e-01  1.90e+00  2.10e+00   ph/cm2/s
      90%_error_low -1.20e-01 -7.30e-02 -6.61e-02 -1.06e-01 -2.17e-01 -2.47e-01   ph/cm2/s
      90%_error_hi   1.24e-01  7.30e-02  6.66e-02  1.30e-01  2.17e-01  2.49e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -5.67e-09 -5.94e-09 -1.10e-08 -4.38e-08 -2.55e-08 -5.60e-08   erg/cm2
      90%_error_hi   5.84e-09  5.93e-09  1.12e-08  5.54e-08  2.60e-08  6.54e-08   erg/cm2
Peak flux      CPL   6.41e-01  7.16e-01  3.90e-01  1.05e-01  1.83e+00  1.85e+00   ph/cm2/s
      90%_error_low -1.39e-01 -9.92e-02 -8.13e-02 -1.05e-01 -2.24e-01 -2.39e-01   ph/cm2/s
      90%_error_hi   1.41e-01  1.05e-01  7.69e-02  1.85e-01  2.24e-01  2.67e-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
  343.9286   -70.9731   0.0121    27.1289   129.1528         0.3613818     15.805 TRIG_00370846                 
 
Foreground time interval of the image:
  0.024   2.440 (delta_t =   2.416 [sec])
Background time interval of the image:
-239.048   0.024 (delta_t = 239.072 [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    0.024 sec. to    2.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.79615     ( -0.201623   0.193281 )
Norm@50keV  : 8.89137E-03    ( -0.00113526   0.00111183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.92 using 59 PHA bins.
# Reduced chi-squared =          1.384 for     57 degrees of freedom 
# Null hypothesis probability =   2.891445e-02
 
Photon flux (15-150 keV)    in 2.416 sec: 1.22345 ( -0.13095  0.13098 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.97818e-07 ( -2.5482e-08  2.6016e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.024 sec. to    2.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30115     ( -0.412313   0.883059 )
Epeak [keV] : 61.9516      ( -19.123 -61.9516 )
Norm@50keV  : 1.68107E-02    ( -0.010374   0.0354842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.60 using 59 PHA bins.
# Reduced chi-squared =          1.386 for     56 degrees of freedom 
# Null hypothesis probability =   2.958503e-02
 
Photon flux (15-150 keV)    in 2.416 sec: 1.19859 ( -0.1359  0.13587 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.008 sec. to    0.992 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71279     ( -0.202761   0.194838 )
Norm@50keV  : 1.42068E-02    ( -0.0018813   0.00184872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.46 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     57 degrees of freedom 
# Null hypothesis probability =   8.139668e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.89541 ( -0.21677  0.2168 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31432e-07 ( -1.80406e-08  1.84191e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.008 sec. to    0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.670153     ( -0.878345   1.16344 )
Epeak [keV] : 55.1356      ( -12.0273 63.3437 )
Norm@50keV  : 5.49951E-02    ( -0.0549954   0.198594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.20 using 59 PHA bins.
# Reduced chi-squared =          1.218 for     56 degrees of freedom 
# Null hypothesis probability =   1.270433e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.82699 ( -0.22386  0.22399 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18498e-07 ( -1.96837e-08  2.10103e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -3.235003087383637E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.048000 0.024000

# RAcent #  [deg] 170.0261 -60.6619 186.6843 -62.7498 244.9663 -15.6435 255.9619 -37.8166 256.3477 -36.4348 263.1413 -24.6886 264.5620 -44.3310 270.2364 -25.0774 270.2693 -25.6901 274.0860 -14.0437 275.9297 -30.4008 285.1578 -24.8875 262.9255 -33.8038 52.7207 -59.0148 255.2339 -41.6557

Pre-slew

 Time interval of the image: 0.024000 2.440000

# RAcent #  [deg] 170.4330 -60.6139 186.3544 -62.7589 244.8666 -15.6764 255.8016 -37.8821 256.4345 -36.4432 262.9957 -24.7507 2138.7 264.7978 -44.6032 270.3714 -24.9954 270.3961 -25.7414 274.0209 -13.9818 275.9998 -30.2880 285.0010 -25.0680 262.9503 -33.7980 347.9556 -53.3741 343.9288 -70.9732 58.6992 -63.4265 280.8838 -26.2075 279.8275 -63.7157

Post-slew

 Time interval of the image: 406.452600 638.552590

# RAcent #  [deg] 263.0771 -24.5935 264.8178 -44.3228 268.3311  -1.4685 270.1871 -25.1239 270.1428 -25.6524 273.9206 -14.0030 275.9507 -30.3553 285.0009 -24.8971 288.7665  10.9411 262.9693 -33.7877 297.6792  13.1710 298.1918   0.2666 49.5919 -62.8239 5.7023 -71.6122 51.9597 -67.0701 60.5531 -69.7183

IMY = -3.973183775783828E-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] ['] 347.9 37.5 -132.5 -0.0124 -0.0 8.8 Cen X-3 158.4 30.6 -124.9 -0.0212 -0.1 1.4 GX 301-2 0.7 52.7 -27.8 9.9837 16.2 0.8 Sco X-1 0.8 29.4 -17.0 2.9420 14.6 2.0 4U 1700-377 2.3 30.8 -16.2 1.0770 5.0 4.3 GX 349+2 229.2 42.3 -5.5 -0.0159 -0.1 8.0 GX 1+4 3.5 22.7 -2.8 0.6360 3.3 10.5 4U 1735-44 5.3 42.2 4.1 0.7877 2.2 2.6 GX 5-1 3.1 41.6 4.2 1.3311 3.7 3.6 GRS 1758-258 5.1 53.5 7.7 1.7223 2.3 4.7 GX 17+2 3.5 37.4 12.8 0.9564 3.3 2.0 H1820-303 9.4 44.3 23.6 0.5913 1.2 6.9 HT1900.1-2455 9.6 33.2 -5.8 -0.2949 -1.2 3.7 GX 354-0 3.4 52.0 154.9 3.6910 3.4 ------ UNKNOWN 2.5 25.7 -19.1 0.9111 4.7 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 3.8 37.4 -132.2 -0.0927 -3.1 3.5 Cen X-3 5.6 30.7 -125.1 -0.0493 -2.0 8.3 GX 301-2 9.0 52.7 -27.9 0.0750 1.3 6.9 Sco X-1 10.9 29.4 -17.3 0.0199 1.1 9.1 4U 1700-377 211.1 30.8 -16.1 0.0011 0.1 1.2 GX 349+2 42.2 -5.7 -0.0001 -0.0 0.8 GX 1+4 6.6 22.4 -2.3 0.0316 1.7 9.5 4U 1735-44 101.1 42.3 4.2 0.0032 0.1 6.9 GX 5-1 7.7 41.5 4.3 -0.0409 -1.5 5.1 GRS 1758-258 16.8 53.5 7.6 -0.0484 -0.7 3.4 GX 17+2 4.5 37.5 12.9 0.0647 2.6 6.1 H1820-303 5.6 44.1 23.4 -0.0821 -2.1 9.1 HT1900.1-2455 6.3 33.2 -5.8 0.0379 1.8 2.9 GX 354-0 2.3 40.7 108.2 0.3807 5.0 ------ UNKNOWN 0.7 27.1 129.2 0.3613 15.8 ------ UNKNOWN 2.6 48.4 159.9 0.2194 4.4 ------ UNKNOWN 2.0 42.3 18.5 0.1882 5.9 ------ UNKNOWN 2.3 7.8 67.1 0.0820 5.0 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 11.7 45.1 -50.5 -0.5750 -1.0 9.9 GX 1+4 7.7 36.7 -78.1 -0.6020 -1.5 8.3 4U 1735-44 7.1 56.1 -23.2 1.1278 1.6 2.4 SW J1753.5-0127 8.5 39.3 -46.2 0.4632 1.4 5.9 GX 5-1 0.0 39.1 -46.9 0.6267 1.9 10.2 GRS 1758-258 4.6 43.3 -29.5 0.8286 2.5 5.4 GX 17+2 23.6 32.4 -49.8 -0.1163 -0.5 1.5 H1820-303 5.7 28.3 -32.3 0.4128 2.0 2.4 HT1900.1-2455 3.2 55.2 5.8 2.8212 3.5 1.9 GRS 1915+105 66.6 41.0 -62.6 0.0944 0.2 3.0 GX 354-0 3.4 54.4 16.7 3.5138 3.4 ------ UNKNOWN 2.5 41.9 12.2 1.1847 4.6 ------ UNKNOWN 2.6 58.3 -175.7 5.7127 4.4 ------ UNKNOWN 2.8 41.5 -165.2 1.0796 4.2 ------ UNKNOWN 3.3 57.5 -170.6 3.0221 3.5 ------ UNKNOWN 3.2 59.1 -166.2 4.3238 3.7 ------ 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