GRB130427B

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 12 03:59:38 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger554635
======================================================================

  Trigger: 00554635      Segment: 000

  BAT Trigger Time: 388761652.288   [s; MET]
      Trigger Stop: 388761653.312   [s; MET]
               UTC: 2013-04-27T13:20:41.798740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 314.890834623513   Dec: -22.5305015261419  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.7
     Image Trigger?:     NO
     Rate S/N Ratio:     12.1655250605964  [ if not an image trigger ]
     Image S/N Ratio:    8.7

  Analysis Position:   [ source = BAT ]
    RA: 314.890834623513   Dec: -22.5305015261419  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 314.897486886499   Dec: -22.5368500737513  [deg; J2000]  
        { 20h 59m 35.4s , -22d 32' 12.7" }
         +/- 1.33997238808646 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.50840427909294 [arcmin] (formal 1-sigma fit error)
    SNR: 20.0240942645296
 
  Angular difference between the analysis and refined position is 0.530101 arcmin
 
  Partial Coding Fraction: 0.2226562    [ including projection effects ]

  Duration
     T90: 25.904000043869 +/- 5.97184327558282
        Measured from: -0.0559999942779541
                   to: 25.8480000495911     [s; relative to TRIGTIME]
     T50: 4.80000007152557 +/- 1.93923694237467
        Measured from: 1.52799999713898
                   to: 6.32800006866455     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.972000002861023     
                   to: 1.97200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.61599999666214     
                   to: 29.4959999918938     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.602832   0.947531   0.604642   0.138968
           0.071928   0.072363   0.061342   0.051789 [error]
 Peak      0.086912   0.138102   0.117371   0.044114
           0.015599   0.017821   0.015883   0.010921 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   30.112   -0.616   29.496
T90    25.904   -0.056   25.848
T50     4.800    1.528    6.328
Peak    1.000    0.972    1.972
 
 
====== 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      -1.628    -0.155      0.153       -           -               -         5.18e-03     -4.85e-04          4.82e-04      41.810   57
CPL     -1.129    -0.561      0.699       82.856     -25.639       -82.856      9.51e-03     -4.56e-03          1.25e-02      39.800   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      -1.391     -0.211     0.213       -           -               -         2.59e-02     -3.38e-03          3.37e-03      38.960   57
CPL     -1.140     -0.439     0.896      180.147    -180.147      -180.147      3.45e-02     -1.57e-02          5.82e-02      38.670   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   2.25e-07  3.82e-07  4.94e-07  1.29e-06  1.45e-06  2.39e-06   erg/cm2
      90%_error_low -3.26e-08 -3.55e-08 -5.99e-08 -2.99e-07 -1.44e-07 -3.56e-07   erg/cm2
      90%_error_hi   3.37e-08  3.53e-08  5.98e-08  3.55e-07  1.45e-07  3.98e-07   erg/cm2
Peak flux       PL   9.60e-01  1.03e+00  7.86e-01  9.79e-01  3.15e+00  3.76e+00   ph/cm2/s
      90%_error_low -2.15e-01 -1.51e-01 -1.21e-01 -2.73e-01 -4.24e-01 -4.94e-01   ph/cm2/s
      90%_error_hi   2.27e-01  1.49e-01  1.19e-01  3.27e-01  4.25e-01  4.96e-01   ph/cm2/s
 
Fluence        CPL   2.10e-07  4.04e-07  5.04e-07  6.07e-07  1.40e-06  1.73e-06   erg/cm2
      90%_error_low -3.73e-08 -4.45e-08 -6.49e-08 -3.46e-07 -1.62e-07 -3.83e-07   erg/cm2
      90%_error_hi   3.79e-08  4.64e-08  6.53e-08  7.92e-07  1.61e-07  8.34e-07   erg/cm2
Peak flux      CPL   9.18e-01  1.06e+00  8.11e-01  7.45e-01  3.13e+00  3.53e+00   ph/cm2/s
      90%_error_low -2.51e-01 -1.71e-01 -1.39e-01 -4.18e-01 -4.28e-01 -6.17e-01   ph/cm2/s
      90%_error_hi   1.33e-01  1.80e-01  1.46e-01  3.24e-01  4.28e-01  6.74e-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
  314.8975   -22.5369   0.0096    37.5336   -70.9081         2.0793661     20.024 TRIG_00554635                 
 
Foreground time interval of the image:
 -0.616  10.413 (delta_t =  11.029 [sec])
Background time interval of the image:
-439.887 -413.786 (delta_t =  26.101 [sec])
-239.288  -0.616 (delta_t = 238.672 [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   -0.616 sec. to   29.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6276     ( -0.154582   0.153132 )
Norm@50keV  : 5.18189E-03    ( -0.00048496   0.00048198 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.81 using 59 PHA bins.
# Reduced chi-squared =         0.7336 for     57 degrees of freedom 
# Null hypothesis probability =   9.343284e-01
 
Photon flux (15-150 keV)    in 30.11 sec: 0.671739 ( -0.06194  0.06205 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.45473e-06 ( -1.43671e-07  1.45019e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.616 sec. to   29.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12938     ( -0.560871   0.69864 )
Epeak [keV] : 82.8559      ( -25.6395 -82.8561 )
Norm@50keV  : 9.51120E-03    ( -0.00456438   0.0125423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.80 using 59 PHA bins.
# Reduced chi-squared =         0.7107 for     56 degrees of freedom 
# Null hypothesis probability =   9.500240e-01
 
Photon flux (15-150 keV)    in 30.11 sec: 0.658680 ( -0.064018  0.064009 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.39634e-06 ( -1.61727e-07  1.61278e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.972 sec. to    1.972 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39075     ( -0.211304   0.212526 )
Norm@50keV  : 2.59044E-02    ( -0.00337991   0.00337363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.96 using 59 PHA bins.
# Reduced chi-squared =         0.6836 for     57 degrees of freedom 
# Null hypothesis probability =   9.675150e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.14817 ( -0.42444  0.42516 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.50813e-07 ( -3.51776e-08  3.53214e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.972 sec. to    1.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13991     ( -0.438903   0.895678 )
Epeak [keV] : 180.147      ( -180.157 -180.157 )
Norm@50keV  : 3.45239E-02    ( -0.0157195   0.0582219 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.67 using 59 PHA bins.
# Reduced chi-squared =         0.6906 for     56 degrees of freedom 
# Null hypothesis probability =   9.624966e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.13227 ( -0.42769  0.42812 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1966e-07 ( -4.65697e-08  3.59043e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 25.904 sec.
Hardness ratio (energy fluence ratio) = 1.29455383695

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

S(15-50 keV)  = 6.063907e-07
S(50-150 keV) = 8.483423e-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 = 2.512856471787510E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -439.887400 -413.786400 -239.288000 -0.616000

# RAcent #  [deg] 244.9814 -15.6571 255.8206 -37.6761 256.4539 -36.4442 262.9716 -24.5972 264.8923 -44.6082 268.3386  -1.4248 270.4189 -25.0851 270.2537 -25.7589 273.9644 -13.9634 275.9409 -30.3893 285.1845 -24.7762 288.8103  10.9264 299.5901  35.2159 262.8923 -33.9383 243.5326  21.1214 277.3865  26.3821 291.6919 -60.3431 318.8193 -18.0656

Pre-slew

 Time interval of the image: -0.616000 10.412610

# RAcent #  [deg] 245.0634 -15.7655 255.9774 -37.6971 256.6010 -36.5895 263.1206 -24.8968 264.8414 -44.4646 268.5128  -1.4339 270.4481 -25.0859 270.1343 -25.5950 274.1535 -13.8801 275.7593 -30.4159 284.9599 -24.7792 288.9204  11.0750 299.6352  35.3201 262.8194 -33.6798 277.6951 -50.9614 314.8975 -22.5368 302.4474  35.8394 307.0850  28.0158

Post-slew

 Time interval of the image: 66.612600 962.768400

# RAcent #  [deg] 274.0084 -14.0395 275.7522 -30.2396 285.0337 -24.9226 288.8004  10.9557 271.7875 -26.2159 277.5811  11.9970 15.3743 -64.4305 311.8527  36.5126 319.0026  36.0714 7.1183 -29.5705

IMY = 7.260013859811530E-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] ['] 0.7 29.4 89.4 8.2581 17.6 1.0 Sco X-1 0.0 27.8 38.0 -0.3064 -0.9 12.8 4U 1700-377 3.2 26.5 39.1 1.2314 3.6 1.5 GX 349+2 12.7 14.6 55.1 0.2132 0.9 9.1 GX 1+4 11.7 29.9 18.2 -0.3163 -1.0 11.4 4U 1735-44 7.8 16.3 156.1 0.3985 1.5 2.4 SW J1753.5-0127 2.2 10.2 30.3 1.3934 5.3 7.3 GX 5-1 3.5 10.9 29.3 0.8793 3.4 2.8 GRS 1758-258 5.2 2.6 145.9 0.5500 2.2 5.0 GX 17+2 4.8 14.3 1.7 0.6174 2.4 1.6 H1820-303 7.3 12.5 -41.5 -0.3919 -1.6 11.8 HT1900.1-2455 1.1 30.0 -150.5 3.2556 11.0 1.3 GRS 1915+105 7.2 56.1 -153.6 -2.1161 -1.6 0.9 Cyg X-1 3.4 21.2 33.2 0.9138 3.4 7.9 GX 354-0 2.5 48.7 141.6 5.9878 4.5 ------ UNKNOWN 2.9 42.5 -174.8 1.8978 4.0 ------ UNKNOWN 2.5 45.8 -8.2 1.9416 4.6 ------ UNKNOWN 2.3 41.3 -77.9 5.2231 4.9 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 74.9 29.3 89.2 0.0103 0.2 8.9 Sco X-1 13.2 27.7 37.8 0.0454 0.9 8.8 4U 1700-377 0.0 26.5 38.7 0.0968 1.9 12.8 GX 349+2 14.6 14.6 53.8 -0.0342 -0.8 10.9 GX 1+4 7.4 29.8 18.4 -0.0792 -1.6 4.3 4U 1735-44 7.3 16.2 156.7 0.0617 1.6 8.8 SW J1753.5-0127 6.5 10.2 30.2 -0.0699 -1.8 8.9 GX 5-1 0.0 10.8 30.2 -0.0681 -1.7 12.7 GRS 1758-258 0.0 2.6 150.3 -0.0764 -2.0 12.7 GX 17+2 13.2 14.3 2.3 0.0341 0.9 9.1 H1820-303 11.1 12.3 -40.8 0.0420 1.0 9.4 HT1900.1-2455 8.7 30.2 -150.4 -0.0641 -1.3 10.6 GRS 1915+105 5.2 56.2 -153.6 0.5109 2.2 7.4 Cyg X-1 8.8 21.0 33.7 0.0614 1.3 12.6 GX 354-0 2.3 34.9 0.6 0.2570 4.9 ------ UNKNOWN 0.6 37.5 -70.9 2.0794 20.0 ------ UNKNOWN 2.1 57.8 -151.5 1.5836 5.5 ------ UNKNOWN 2.1 53.6 -142.2 1.5399 5.5 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 12.4 39.6 112.0 1.9031 0.9 0.2 GX 17+2 0.0 35.7 86.0 -1.7326 -1.1 11.8 H1820-303 46.3 27.4 95.9 0.2494 0.2 0.2 HT1900.1-2455 1.6 42.1 156.8 10.1757 7.0 0.6 GRS 1915+105 3.7 39.2 92.5 7.2291 3.1 ------ UNKNOWN 2.0 50.3 146.5 19.2194 5.7 ------ UNKNOWN 3.2 57.2 -9.7 10.7278 3.6 ------ UNKNOWN 2.8 59.1 -166.0 14.8904 4.1 ------ UNKNOWN 3.8 58.7 -159.2 14.2777 3.1 ------ UNKNOWN 3.5 47.1 -53.0 11.3623 3.3 ------ 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