GRB140408A

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: Sat Oct  4 23:50:09 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger595141
======================================================================

  Trigger: 00595141      Segment: 000

  BAT Trigger Time: 418655766.656   [s; MET]
      Trigger Stop: 418655768.704   [s; MET]
               UTC: 2014-04-08T13:15:54.794960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 290.684540061204   Dec: -12.578173144477  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.83
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7046999107196  [ if not an image trigger ]
     Image S/N Ratio:    7.83

  Analysis Position:   [ source = BAT ]
    RA: 290.684540061204   Dec: -12.578173144477  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 290.721755011471   Dec: -12.5845738421696  [deg; J2000]  
        { 19h 22m 53.2s , -12d 35' 04.5" }
         +/- 1.8711852608461 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.900254967281793 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4273952602332
 
  Angular difference between the analysis and refined position is 2.212860 arcmin
 
  Partial Coding Fraction: 0.4023438    [ including projection effects ]

  Duration
     T90: 3.62799996137619 +/- 0.606155095312045
        Measured from: -0.540000021457672
                   to: 3.08799993991852     [s; relative to TRIGTIME]
     T50: 1.82399994134903 +/- 0.579889597109368
        Measured from: 0.236000001430511
                   to: 2.05999994277954     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.719999969005585     
                   to: 1.71999996900558     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.680000007152557     
                   to: 3.44799995422363     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.148278   0.143476   0.170564   0.042135
           0.023677   0.023369   0.019813   0.019513 [error]
 Peak      0.056499   0.043170   0.050020   0.023436
           0.011965   0.011736   0.010168   0.009711 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    4.128   -0.680    3.448
T90     3.628   -0.540    3.088
T50     1.824    0.236    2.060
Peak    1.000    0.720    1.720
 
 
====== 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      -1.488    -0.245      0.245       -           -               -         8.30e-03     -1.15e-03          1.15e-03      58.100   57
CPL     -1.002    -0.683      1.172      109.210     -45.483      -109.210      1.41e-02     -6.80e-03          3.41e-02      57.350   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      -1.699     -0.421     0.404       -           -               -         1.07e-02     -2.52e-03          2.43e-03      66.570   57
CPL     -1.713     -0.408     0.578     9999.360    -9999.350      -9999.360      1.06e-02     -1.06e-02          2.57e-02      66.580   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   4.32e-08  8.00e-08  1.14e-07  3.43e-07  3.26e-07  5.81e-07   erg/cm2
      90%_error_low -1.04e-08 -1.21e-08 -2.01e-08 -1.15e-07 -4.86e-08 -1.32e-07   erg/cm2
      90%_error_hi   1.12e-08  1.19e-08  1.98e-08  1.49e-07  4.90e-08  1.59e-07   erg/cm2
Peak flux       PL   5.33e-01  4.77e-01  2.94e-01  2.75e-01  1.42e+00  1.58e+00   ph/cm2/s
      90%_error_low -1.87e-01 -1.08e-01 -8.96e-02 -1.39e-01 -3.12e-01 -3.38e-01   ph/cm2/s
      90%_error_hi   2.04e-01  1.06e-01  8.77e-02  2.07e-01  3.13e-01  3.39e-01   ph/cm2/s
 
Fluence        CPL   3.91e-08  8.32e-08  1.19e-07  1.84e-07  3.16e-07  4.25e-07   erg/cm2
      90%_error_low -1.32e-08 -1.36e-08 -2.22e-08 -1.22e-07 -5.20e-08 -1.34e-07   erg/cm2
      90%_error_hi   1.36e-08  1.42e-08  2.30e-08  2.75e-07  5.22e-08  2.13e-07   erg/cm2
Peak flux      CPL   5.08e-01  3.80e-01  1.97e-01  1.73e-01  1.16e+00  1.26e+00   ph/cm2/s
      90%_error_low     N/A   -1.82e-01 -8.75e-02 -8.14e-02     N/A   -5.83e-01   ph/cm2/s
      90%_error_hi      N/A    1.66e-01  4.66e-02  5.70e-02     N/A    3.32e-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
  290.7218   -12.5846   0.0155    40.3269  -142.3042         0.5638398     12.427 TRIG_00595141                 
 
Foreground time interval of the image:
 -0.680   3.448 (delta_t =   4.128 [sec])
Background time interval of the image:
-179.656  -0.680 (delta_t = 178.976 [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   -0.680 sec. to    3.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48814     ( -0.245436   0.244904 )
Norm@50keV  : 8.29607E-03    ( -0.00115257   0.0011494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.10 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     57 degrees of freedom 
# Null hypothesis probability =   4.345988e-01
 
Photon flux (15-150 keV)    in 4.128 sec: 1.03243 ( -0.148818  0.14958 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.25559e-07 ( -4.85527e-08  4.89824e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.680 sec. to    3.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00243     ( -0.683175   1.1715 )
Epeak [keV] : 109.210      ( -45.4831 -109.211 )
Norm@50keV  : 1.41411E-02    ( -0.00679768   0.0340647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.35 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     56 degrees of freedom 
# Null hypothesis probability =   4.249318e-01
 
Photon flux (15-150 keV)    in 4.128 sec: 1.00549 ( -0.159276  0.15823 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.16191e-07 ( -5.19686e-08  5.22258e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.720 sec. to    1.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69892     ( -0.420587   0.40416 )
Norm@50keV  : 1.06899E-02    ( -0.00252116   0.00243418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.57 using 59 PHA bins.
# Reduced chi-squared =          1.168 for     57 degrees of freedom 
# Null hypothesis probability =   1.807173e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.41927 ( -0.31209  0.31289 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.89988e-08 ( -2.38988e-08  2.43514e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.720 sec. to    1.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71319     ( -0.411527   0.57436 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 1.06154E-02    ( -0.010682   0.0256653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.58 using 59 PHA bins.
# Reduced chi-squared =          1.189 for     56 degrees of freedom 
# Null hypothesis probability =   1.573855e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.15754 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.89145e-08 ( -2.39596e-08  2.67898e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 3.628 sec.
Hardness ratio (energy fluence ratio) = 1.42593550188

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

S(15-50 keV)  = 1.2328771e-07
S(50-150 keV) = 2.0226841e-07

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 = -6.716837489736525E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -179.656000 -0.680000

# RAcent #  [deg] 170.6174 -60.6159 186.8229 -62.8265 244.9780 -15.6359 255.9897 -37.8128 256.3539 -36.4662 262.8278 -24.7989 264.5041 -44.5150 268.4669  -1.3229 270.2500 -25.0679 270.4082 -25.8774 274.1462 -14.0150 275.8207 -30.2038 285.1174 -24.9343 288.7992 262.9326 -33.8102 185.7668 -47.8683 249.6329   8.3216 240.5999 -46.5310 237.3162 -60.7820 265.6768 -27.7041 266.1067 -28.7364 UNKNOWN UNKNOWN UNKNOWN UNKNOWN

Pre-slew

 Time interval of the image: -0.680000 3.448000

# RAcent #  [deg] 170.4055 -60.6013 186.6316 -62.6590 245.0820 -15.5263 256.1718 -37.8802 256.6724 -36.3305 263.1331 -24.8143 264.5382 -44.4170 268.4322  -1.4159 270.1722 -24.9036 270.3312 -25.5962 274.0380 -14.1536 276.0740 -30.5362 285.1932 -25.0595 288.7186  10.8191 262.7692 -33.9396 200.1067 -40.8993 264.0913  14.1838 266.4987  11.0987 279.0894  13.4474 290.7218 -12.5846

Post-slew

 Time interval of the image: 89.244630 902.420500

# RAcent #  [deg] 255.8113 -37.8718 256.6092 -36.3684 262.9137 -24.8741 264.5576 -44.3982 268.5158  -1.4827 270.2430 -25.1257 270.4743 -25.8688 273.8624 -14.1910 275.9651 -30.3537 284.8719 -24.9136 288.8105  10.9540 299.5162  35.2024 308.0066  40.8748 262.9003 -33.8257 252.7816 -52.5430 266.1742 -28.7448 283.2864 -24.3714 306.0107 -63.5611 310.4419 -68.2617 317.8568 -16.4049 322.6944  21.2497

IMY = 5.190579036363208E-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] ['] 69.0 54.3 18.4 0.2564 0.2 8.9 Cen X-3 8.0 46.3 17.8 0.8657 1.4 5.7 GX 301-2 0.7 26.7 134.3 5.5813 16.4 0.3 Sco X-1 1.3 2.5 139.2 2.1836 8.6 1.9 4U 1700-377 2.9 3.7 151.0 1.0265 3.9 4.7 GX 349+2 4.5 16.0 -179.9 0.7033 2.5 10.4 GX 1+4 7.3 7.0 -67.3 -0.4121 -1.6 10.9 4U 1735-44 6.6 40.1 178.9 0.7650 1.8 9.8 SW J1753.5-0127 4.0 18.6 -158.8 0.7860 2.9 2.0 GX 5-1 6.9 18.0 -157.0 0.4445 1.7 9.9 GRS 1758-258 3.2 30.0 -164.3 1.1115 3.6 8.3 GX 17+2 6.5 18.1 -136.1 0.4678 1.8 11.2 H1820-303 4.7 27.8 -133.3 0.8316 2.4 4.5 HT1900.1-2455 10.9481 915.5 58.9 -161.8 -0.0239 -0.0 0.2 GRS 1915+105 4.9 7.8 -160.9 0.6570 2.4 3.2 GX 354-0 2.9 50.1 37.2 5.3090 4.0 ------ UNKNOWN 2.6 49.0 151.3 5.0986 4.4 ------ UNKNOWN 3.4 13.6 37.8 0.8792 3.4 ------ UNKNOWN 3.4 24.0 5.3 0.9318 3.4 ------ UNKNOWN 2.0 14.3 -166.7 1.6028 5.7 ------ UNKNOWN 1.3 13.5 -163.2 2.5229 8.7 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.3 54.4 18.3 -0.4435 -2.6 2.9 Cen X-3 8.4 46.4 18.0 -0.0831 -1.4 6.7 GX 301-2 3.6 26.8 134.6 -0.1070 -3.2 9.0 Sco X-1 4.8 2.4 141.8 -0.0622 -2.4 9.0 4U 1700-377 0.0 3.8 155.1 -0.0139 -0.6 12.7 GX 349+2 4.0 16.1 -178.9 0.0741 2.9 7.9 GX 1+4 7.1 6.9 -68.1 -0.0412 -1.6 9.0 4U 1735-44 7.0 40.0 178.9 0.0675 1.6 4.4 SW J1753.5-0127 3.4 18.7 -159.3 0.0848 3.4 12.2 GX 5-1 55.4 18.2 -157.7 -0.0052 -0.2 8.9 GRS 1758-258 5.6 29.9 -164.4 -0.0578 -2.1 7.3 GX 17+2 0.0 18.1 -134.9 -0.0617 -2.3 12.7 H1820-303 6.3 27.8 -133.0 0.0566 1.8 11.9 HT1900.1-2455 0.0 58.7 -161.8 0.0615 0.4 8.9 GRS 1915+105 0.0 7.6 -161.2 -0.0171 -0.7 12.6 GX 354-0 2.3 42.6 50.9 0.4341 4.9 ------ UNKNOWN 2.2 54.7 169.5 0.7005 5.2 ------ UNKNOWN 2.2 52.0 172.9 0.4689 5.3 ------ UNKNOWN 2.5 57.3 -173.2 0.5963 4.6 ------ UNKNOWN 0.9 40.3 -142.3 0.5637 12.4 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 6.9 40.0 52.7 5.6205 1.7 8.5 4U 1700-377 60.8 38.7 54.2 -0.5901 -0.2 9.0 GX 349+2 22.4 28.9 69.0 1.0714 0.5 9.3 GX 1+4 6.2 38.9 38.2 4.5816 1.9 8.5 4U 1735-44 9.1 24.6 123.2 -2.0830 -1.3 9.0 SW J1753.5-0127 2.8 23.0 62.1 6.2507 4.2 3.6 GX 5-1 12.7 23.2 60.2 -1.3784 -0.9 12.0 GRS 1758-258 0.0 16.4 90.6 3.4879 2.2 12.5 GX 17+2 6.2 22.4 43.2 2.6754 1.9 2.2 H1820-303 3.3 13.5 31.3 4.6127 3.5 8.9 HT1900.1-2455 1.4 23.6 -176.5 10.9470 8.3 0.9 GRS 1915+105 2.4 48.5 -162.3 14.9635 4.8 3.6 Cyg X-1 8.0 55.8 -156.1 -9.8015 -1.5 6.6 Cyg X-3 2.8 33.0 53.4 9.0430 4.2 4.5 GX 354-0 3.0 50.1 37.2 22.5962 3.8 ------ UNKNOWN 1.4 27.9 59.0 15.8285 8.3 ------ UNKNOWN 3.1 13.7 37.7 4.9596 3.8 ------ UNKNOWN 3.2 52.1 -0.5 12.8295 3.6 ------ UNKNOWN 2.6 57.1 -0.5 28.3175 4.4 ------ UNKNOWN 2.4 26.6 -70.4 8.0264 4.8 ------ UNKNOWN 3.0 46.2 -128.7 22.3686 3.8 ------ 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