GRB080413B

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 Apr 24 23:19:02 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger309111
======================================================================

  Trigger: 00309111      Segment: 000

  BAT Trigger Time: 229769475.264   [s; MET]
      Trigger Stop: 229769476.288   [s; MET]
               UTC: 2008-04-13T08:51:12.549840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 326.134366952306   Dec: -19.9693461700508  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    23
     Image Trigger?:     NO
     Rate S/N Ratio:     128.596267441944  [ if not an image trigger ]
     Image S/N Ratio:    23

  Analysis Position:   [ source = BAT ]
    RA: 326.134366952306   Dec: -19.9693461700508  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 326.137720791794   Dec: -19.9812353957063  [deg; J2000]  
        { 21h 44m 33.1s , -19d 58' 52.4" }
         +/- 0.82967867411914 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.274502355152754 [arcmin] (formal 1-sigma fit error)
    SNR: 39.7156194871877
 
  Angular difference between the analysis and refined position is 0.737998 arcmin
 
  Partial Coding Fraction: 0.2011719    [ including projection effects ]

  Duration
     T90: 8 +/- 2
        Measured from: -1.26399999856949
                   to: 6.73600000143051     [s; relative to TRIGTIME]
     T50: 2 +/- 1
        Measured from: -0.263999998569489
                   to: 1.73600000143051     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.263999998569489     
                   to: 0.736000001430511     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.26399999856949     
                   to: 10.7360000014305     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.586212   2.146432   1.482266   0.320190
           0.050333   0.054845   0.047417   0.034494 [error]
 Peak      0.498519   0.843271   0.670540   0.162555
           0.021740   0.027141   0.024799   0.015514 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   12.000   -1.264   10.736
T90     8.000   -1.264    6.736
T50     2.000   -0.264    1.736
Peak    1.000   -0.264    0.736
 
 
====== 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      -1.742    -0.058      0.058       -           -               -         3.03e-02     -9.95e-04          9.93e-04      60.650   57
CPL     -1.230    -0.241      0.255       77.650     -10.814        24.401      5.37e-02     -1.24e-02          1.73e-02      46.760   56
 
 
=== 1-s peak 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      -1.454     -0.063     0.063       -           -               -         1.50e-01     -5.63e-03          5.63e-03      56.080   57
CPL     -0.944     -0.262     0.278      111.345     -21.844        59.334      2.63e-01     -6.43e-02          9.15e-02      44.410   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   5.83e-07  9.24e-07  1.11e-06  2.57e-06  3.36e-06  5.19e-06   erg/cm2
      90%_error_low -3.31e-08 -3.18e-08 -4.69e-08 -2.29e-07 -1.13e-07 -2.64e-07   erg/cm2
      90%_error_hi   3.38e-08  3.17e-08  4.68e-08  2.42e-07  1.13e-07  2.74e-07   erg/cm2
Peak flux       PL   5.91e+00  6.11e+00  4.46e+00  5.23e+00  1.85e+01  2.17e+01   ph/cm2/s
      90%_error_low -3.97e-01 -2.58e-01 -1.98e-01 -4.59e-01 -7.29e-01 -8.15e-01   ph/cm2/s
      90%_error_hi   4.06e-01  2.57e-01  1.97e-01  4.84e-01  7.30e-01  8.16e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -3.31e-08 -3.18e-08 -4.69e-08 -2.29e-07 -1.13e-07 -2.64e-07   erg/cm2
      90%_error_hi   3.38e-08  3.17e-08  4.68e-08  2.42e-07  1.13e-07  2.74e-07   erg/cm2
Peak flux      CPL   5.29e+00  6.36e+00  4.72e+00  3.23e+00  1.81e+01  1.96e+01   ph/cm2/s
      90%_error_low -4.88e-01 -2.93e-01 -2.40e-01 -6.80e-01 -7.50e-01 -1.04e+00   ph/cm2/s
      90%_error_hi   4.98e-01  2.97e-01  2.43e-01  8.87e-01  7.52e-01  1.15e+00   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
  326.1377   -19.9812   0.0049    36.2023   -87.3746         5.8497357     39.716 TRIG_00309111                 
 
Foreground time interval of the image:
 -1.264  10.736 (delta_t =  12.000 [sec])
Background time interval of the image:
-239.264  -1.264 (delta_t = 238.000 [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   -1.264 sec. to   10.736 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.74235     ( -0.0582662   0.0578771 )
Norm@50keV  : 3.02944E-02    ( -0.000994771   0.000993314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.65 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     57 degrees of freedom 
# Null hypothesis probability =   3.457020e-01
 
Photon flux (15-150 keV)    in 12 sec: 4.08503 ( -0.14275  0.14315 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35646e-06 ( -1.13129e-07  1.13394e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.264 sec. to   10.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23048     ( -0.241381   0.255163 )
Epeak [keV] : 77.6499      ( -10.8136 24.4012 )
Norm@50keV  : 5.37366E-02    ( -0.0124414   0.0173335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.76 using 59 PHA bins.
# Reduced chi-squared =         0.8351 for     56 degrees of freedom 
# Null hypothesis probability =   8.056769e-01
 
Photon flux (15-150 keV)    in 12 sec: 3.95089 ( -0.15392  0.15451 ) 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   -0.264 sec. to    0.736 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45409     ( -0.062711   0.062544 )
Norm@50keV  : 0.149995    ( -0.0056302   0.00562872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.08 using 59 PHA bins.
# Reduced chi-squared =         0.9838 for     57 degrees of freedom 
# Null hypothesis probability =   5.096617e-01
 
Photon flux (15-150 keV)    in 1 sec: 18.5040 ( -0.7286  0.7296 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43443e-06 ( -5.75059e-08  5.76428e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.264 sec. to    0.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.94413     ( -0.261524   0.27794 )
Epeak [keV] : 111.345      ( -21.8444 59.333 )
Norm@50keV  : 0.262906    ( -0.0643039   0.0914711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.41 using 59 PHA bins.
# Reduced chi-squared =         0.7931 for     56 degrees of freedom 
# Null hypothesis probability =   8.679898e-01
 
Photon flux (15-150 keV)    in 1 sec: 18.1267 ( -0.7505  0.7516 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40275e-06 ( -6.08505e-08  6.06397e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 8.0 sec.
Hardness ratio (energy fluence ratio) = 1.19558363922

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

S(15-50 keV)  = 1.507348e-06
S(50-150 keV) = 1.8491303e-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 = 3.352746678764664E-02,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.264000 -1.264000

# RAcent #  [deg] 256.0707 -37.8202 256.4110 -36.5572 262.8753 -24.6195 264.6343 -44.5812 268.3866  -1.4521 270.2052 -25.1391 270.1680 -25.7087 274.0714 -14.0951 275.9409 -30.3590 285.0505 -24.8819 288.7303  10.9281 262.8888 -33.8865 245.3322 -16.6748 266.7949 -27.3594 277.3015 -23.7981 289.3230 -34.9450 285.2097   0.7171 285.2400   7.4263 314.0114 -17.8759 305.8002  18.3594

Pre-slew

 Time interval of the image: -1.264000 10.736000

# RAcent #  [deg] 256.1670 -37.8791 256.2620 -36.3547 262.9156 -24.6001 264.7739 -44.4433 268.4954  -1.5856 270.1467 -24.9804 270.3080 -25.7883 274.1558 -14.1762 275.7513 -30.3724 284.9368 -25.0793 288.8770  11.1017 263.1756 -33.7775 263.9918  -1.6597 291.5600 -79.6949 280.9647   1.9966 349.9949 -76.2738 326.1377 -19.9812

Post-slew

 Time interval of the image: 115.636600 962.858700

# RAcent #  [deg] 285.1504 -25.0116 288.8384  10.9627 326.1763  38.3543 285.3955 -41.6945 319.5066 -52.9888 342.5763   4.9687 348.1593  -4.5351 353.7782  -4.1908 357.1323  -8.5063 352.6198  16.4467

IMY = 7.311830148425137E-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] ['] 3.0 28.0 67.0 1.0963 3.9 4.2 4U 1700-377 16.7 27.5 69.6 0.1905 0.7 8.1 GX 349+2 13.1 22.1 98.6 -0.1963 -0.9 10.5 GX 1+4 13.0 24.8 47.2 0.1898 0.9 9.1 4U 1735-44 96.8 31.9 148.4 0.0356 0.1 1.1 SW J1753.5-0127 3.6 15.5 101.8 0.6421 3.3 5.6 GX 5-1 3.8 15.4 99.6 0.6789 3.5 7.6 GRS 1758-258 2.1 18.3 141.4 1.1172 5.6 5.2 GX 17+2 2.9 10.3 78.4 0.7014 4.0 1.0 H1820-303 7.2 3.4 150.0 0.2886 1.6 2.4 HT1900.1-2455 24.9 38.6 -171.5 0.1252 0.5 4.1 GRS 1915+105 2.8 21.8 73.7 0.8928 4.1 5.9 GX 354-0 2.1 40.2 103.1 4.1587 5.6 ------ UNKNOWN 1.0 18.2 92.5 2.3747 11.5 ------ UNKNOWN 2.2 9.8 117.3 0.9191 5.3 ------ UNKNOWN 3.2 7.5 -6.6 0.6534 3.6 ------ UNKNOWN 2.8 28.5 -178.1 0.8319 4.1 ------ UNKNOWN 2.7 35.2 -177.3 0.9780 4.3 ------ UNKNOWN 4.4 26.4 -99.8 0.7314 2.7 ------ UNKNOWN 3.7 49.4 -150.4 1.6621 3.1 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 8.4 27.9 66.8 -0.0757 -1.4 8.8 4U 1700-377 6.4 27.6 70.0 0.1006 1.8 9.3 GX 349+2 9.0 22.1 98.7 0.0655 1.3 10.1 GX 1+4 276.3 24.6 47.3 -0.0020 -0.0 1.4 4U 1735-44 0.0 31.7 148.4 0.0759 1.3 11.0 SW J1753.5-0127 5.5 15.6 102.3 0.0895 2.1 9.5 GX 5-1 7.8 15.3 99.4 0.0643 1.5 2.7 GRS 1758-258 0.0 18.2 141.4 -0.0585 -1.3 12.1 GX 17+2 6.5 10.4 78.5 0.0772 1.8 9.0 H1820-303 71.9 3.3 146.6 -0.0075 -0.2 10.9 HT1900.1-2455 5.6 38.8 -171.3 0.1341 2.1 10.4 GRS 1915+105 6.9 21.6 73.8 0.0801 1.7 9.9 GX 354-0 2.3 34.3 141.6 0.2778 4.9 ------ UNKNOWN 2.2 52.1 5.3 0.6455 5.3 ------ UNKNOWN 2.8 30.3 173.6 0.2064 4.2 ------ UNKNOWN 4.0 56.8 -8.3 0.5476 2.9 ------ UNKNOWN 0.3 36.2 -87.4 5.8495 39.7 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.8 38.0 97.4 5.2975 2.4 8.3 HT1900.1-2455 5.1 48.0 149.6 -6.2690 -2.3 2.6 GRS 1915+105 6.8 58.3 -157.2 9.0739 1.7 2.0 Cyg X-2 2.8 40.6 71.2 11.2977 4.2 ------ UNKNOWN 3.9 33.4 30.0 2.5495 2.9 ------ UNKNOWN 3.0 29.7 -122.6 3.2562 3.8 ------ UNKNOWN 5.5 26.4 -100.1 1.8290 2.1 ------ UNKNOWN 2.4 31.2 -94.0 5.1509 4.9 449.8 UNKNOWN 2.7 32.1 -83.7 4.8008 4.2 538.4 UNKNOWN 2.7 44.8 -119.8 12.7147 4.2 ------ 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

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