batgrbproduct analysis for trigger=557771

batgrbproduct Analysis for Trigger=557771

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 (local time): Sun Jan 12 01:56:59 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger557771
======================================================================

  Trigger: 00557771      Segment: 000

  BAT Trigger Time: 392426072   [s; MET]
      Trigger Stop: 392426136   [s; MET]
               UTC: 2013-06-08T23:14:21.348120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 24.5798859527311   Dec: 41.4938034558663  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.45
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.45

  Flight Position:   [ source = BAT ]
    RA: 24.5798859527311   Dec: 41.4938034558663  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 24.59737320483   Dec: 41.4913200292832  [deg; J2000]  
        { 01h 38m 23.4s , +41d 29' 28.8" }
         +/- 2.54258014483757 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.55481604375909 [arcmin] (formal 1-sigma fit error)
    SNR: 8.01963481432925
 
  Angular difference between Flight and Ground position is 0.799921 arcmin
 
  Partial Coding Fraction: 0.4570312    [ including projection effects ]

  Duration
     T90: 151.851999938488 +/- 10.611898224209
        Measured from: -132.15600001812
                   to: 19.6959999203682     [s; relative to TRIGTIME]
     T50: 79.8439999222755 +/- 59.5630116045272
        Measured from: -71.6480000019073
                   to: 8.19599992036819     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 19.055999994278     
                   to: 20.055999994278     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -135.195999979973     
                   to: 21.727999985218     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.966609   0.542989   0.379777  -0.092155
           0.106471   0.110087   0.098584   0.092962 [error]
 Peak      0.034962   0.018632   0.012795   0.006233
           0.009659   0.009744   0.008544   0.008256 [error]

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

======================================================================
 
=== 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   Power-law 3.19e-07 2.98e-07 1.93e-07 1.94e-07 8.90e-07 1.00e-06   erg/cm2
              Error 5.95e-08 6.01e-08 8.10e-08 1.52e-07 1.90e-07 2.78e-07   erg/cm2
Peak flux Power-law 3.09e-01 1.93e-01 7.72e-02 4.18e-02 6.00e-01 6.21e-01   ph/cm2/s
              Error 1.64e-01 8.97e-02 6.37e-02 7.25e-02 2.55e-01 2.68e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.17e-07 3.05e-07 1.85e-07 1.16e-07 8.69e-07 9.23e-07   erg/cm2
              Error 6.09e-08 6.97e-08 9.57e-08 1.89e-07 2.05e-07 3.10e-07   erg/cm2
Peak flux Cutoff-PL 3.05e-01 2.02e-01 7.42e-02 2.24e-02 5.96e-01 6.03e-01   ph/cm2/s
              Error 1.70e-01 1.11e-01 7.47e-02 4.18e-02 2.56e-01 2.71e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 3.07e-01 1.97e-01 7.66e-02 2.70e-02 5.95e-01 6.13e-01   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.624    0.392    -      -           5.47e-04 1.69e-04   54.700 57
CPL   1.973    0.000       1.6    0.0      1.42e-03 0.00e+00   54.960 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.319    0.952    -      -           3.40e-03 2.19e-03   69.760 57
CPL   1.926    0.000       7.0    0.0      6.02e-03 0.00e+00   69.700 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  156.924 -135.196   21.728
T90   151.852 -132.156   19.696
T50    79.844  -71.648    8.196
Peak    1.000   19.056   20.056

Click here for the BAT GCN circular template

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   24.5974    41.4913   0.0241    41.1765  -147.9737         1.4603147      8.020 TRIG_00557771                 
 
Foreground time interval of the image:
-75.299  21.728 (delta_t =  97.027 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

The mask-weighted light curves based on cleaned DPHs

Spectral Evolution

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 -135.196 sec. to   21.728 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.62427     ( -0.359798   0.424854 )
Norm@50keV  : 5.46619E-04    ( -0.0001682   0.000169508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.70 using 59 PHA bins.
# Reduced chi-squared =         0.9596 for     57 degrees of freedom 
# Null hypothesis probability =   5.619548e-01
 
Photon flux (15-150 keV)    in 156.9 sec: 0.116105 ( -0.0183423  0.0183621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.89556e-07 ( -1.83549e-07  1.96268e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from -135.196 sec. to   21.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97253     (     )
Epeak [keV] : 1.55958      (   )
Norm@50keV  : 1.42126E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.96 using 59 PHA bins.
# Reduced chi-squared =         0.9814 for     56 degrees of freedom 
# Null hypothesis probability =   5.144023e-01
 
Photon flux (15-150 keV)    in 156.9 sec: 0.115436 ( -0.0183261  0.018609 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.68799e-07 ( -1.9775e-07  2.11868e-07 ) ergs/cm2

Band function

Time interval is from -135.196 sec. to   21.728 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -3.20076   ( 3.20076   3.20076 )
beta        : -2.62427    ( -0.424756   0.359654 )
Epeak [keV] : 3.19920      ( -3.1992 -3.1992 )
Norm@50keV   : 7.42931E-02    ( -0.0228607   0.0230387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.70 using 59 PHA bins.
# Reduced chi-squared =         0.9945 for     55 degrees of freedom 
# Null hypothesis probability =   4.861414e-01
 
Photon flux (15-150 keV)    in 156.9 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 5.63795  (-1.07826  1.47028)
R^2/D10^2   : 0.531294  (-0.333737   0.860564)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.28 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.368365e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.202e-07   8.904e-08
25- 50  2.780e-07   1.054e-07
50-150  1.958e-08   1.343e-08
15-150  6.177e-07   2.147e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 27.5756       (-9.8656      16.4019)
Norm        : 0.996936       (-0.323677     0.598619)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.19 using 59 PHA bins.
# Reduced chi-squared =         0.9857 for     57 degrees of freedom 
# Null hypothesis probability =   5.055687e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.041e-07   6.715e-08
25- 50  3.312e-07   9.037e-08
50-150  1.619e-07   9.025e-08
15-150  7.972e-07   2.024e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.98321        (-0.977074      1.13019)
R1^2/D10^2  : 2.06786        (-1.39917      2.99565)
kT2 [keV]   : 15.2834        (-4.8452      8.13363)
R2^2/D10^2  : 5.68442E-03    (-0.00469907   0.0219431)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.83 using 59 PHA bins.
# Reduced chi-squared =         0.9423 for     55 degrees of freedom 
# Null hypothesis probability =   5.965586e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.326e-07   1.807e-07
25- 50  2.789e-07   1.470e-07
50-150  2.828e-07   1.818e-07
15-150  8.943e-07   4.685e-07

Peak spectrum fit

Power-law model

Time interval is from   19.056 sec. to   20.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.31900     ( -0.794689   1.10838 )
Norm@50keV  : 3.39942E-03    ( -0.00221256   0.00217299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.76 using 59 PHA bins.
# Reduced chi-squared =          1.224 for     57 degrees of freedom 
# Null hypothesis probability =   1.194955e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.600422 ( -0.255339  0.255506 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.26027e-08 ( -1.65202e-08  1.86444e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   19.056 sec. to   20.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.92577     (     )
Epeak [keV] : 6.96407      (   )
Norm@50keV  : 6.02423E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.70 using 59 PHA bins.
# Reduced chi-squared =          1.245 for     56 degrees of freedom 
# Null hypothesis probability =   1.032184e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.596198 ( -0.254827  0.256544 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.13445e-08 ( -1.96338e-08  1.96101e-08 ) ergs/cm2

Band function

Time interval is from   19.056 sec. to   20.056 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.93886   ( -6.92883   -4.93886 )
beta        : -2.80335    ( 2.80335   1.12971 )
Epeak [keV] : 22.3551      ( -22.3551 9.62031 )
Norm@50keV   : 1534.69    ( -635.916   1.75537e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.02 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     55 degrees of freedom 
# Null hypothesis probability =   9.686172e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.599269 0.594559 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 6.33064  (-2.35356  4.61436)
R^2/D10^2   : 1.73311  (-1.73297   11.5138)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.40 using 59 PHA bins.
# Reduced chi-squared =          1.235 for     57 degrees of freedom 
# Null hypothesis probability =   1.094378e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.929e-09   6.300e-09
25- 50  1.110e-08   7.660e-09
50-150  1.261e-09   1.181e-09
15-150  2.229e-08   1.409e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 37.8253       (-37.8452      -37.8452)
Norm        : 4.05489       (-2.37944     9.11459)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.80 using 59 PHA bins.
# Reduced chi-squared =          1.225 for     57 degrees of freedom 
# Null hypothesis probability =   1.188064e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.130e-09   5.855e-09
25- 50  1.172e-08   7.670e-09
50-150  8.518e-09   7.350e-09
15-150  2.937e-08   1.981e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.26521        (-5.21285      3.65759)
R1^2/D10^2  : 3.26224        (-2.07426      -3.33023)
kT2 [keV]   : 24.2187        (-23.3002      -23.3002)
R2^2/D10^2  : 5.35342E-03    (-0.0058433   5.79732)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.74 using 59 PHA bins.
# Reduced chi-squared =          1.250 for     55 degrees of freedom 
# Null hypothesis probability =   1.008694e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.027e-08   6.395e-09
25- 50  1.029e-08   5.830e-09
50-150  1.389e-08   1.026e-08
15-150  3.444e-08   1.859e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.05279     ( -0.479483   0.60053 )
Norm@50keV  : 4.80416E-04    ( -0.000209089   0.000232423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.59 using 59 PHA bins.
# Reduced chi-squared =         0.9576 for     57 degrees of freedom 
# Null hypothesis probability =   5.661790e-01
 
Photon flux (15-150 keV)    in 97.03 sec: 0.137323 ( -0.0263465  0.0264226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.7413e-07 ( -1.40786e-07  1.54951e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.93993     (     )
Epeak [keV] : 1.56366      (   )
Norm@50keV  : 2.95034E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9683 for     56 degrees of freedom 
# Null hypothesis probability =   5.423380e-01
 
Photon flux (15-150 keV)    in 97.03 sec: 0.135849 ( -0.026123  0.025663 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.40594e-07 ( -1.40078e-07  1.74777e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.96023   ( -4.68664   1.96241 )
beta        : -9.37167    ( 9.37167   19.3716 )
Epeak [keV] : 1.06550      ( -0.902336 21.6603 )
Norm@50keV   : 2.82779E-03    ( -0.00121505   0.0022592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.22 using 59 PHA bins.
# Reduced chi-squared =         0.9858 for     55 degrees of freedom 
# Null hypothesis probability =   5.045175e-01
 
Photon flux (15-150 keV)    in 97.03 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 2.98e-07
S(50-100 keV) = 1.93e-07

T90 vs. Hardness ratio plot

T90                                   = 151.851999938488 sec.
Hardness ratio (energy fluence ratio) = 0.647651

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.561746
Count Ratio (50-100 keV) / (15-25 keV) = 0.392896

Mask shadow pattern

IMX = -7.415839185258359E-01, IMY = 4.638660711682224E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-75.299410 21.728000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  0.1490 -12.2984    2.3  33.6  105.7   1.2799   5.0 ------	UNKNOWN                       
 24.5974  41.4913    1.4  41.2 -148.0   1.4605   8.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
147.300600 963.134100
1225.000000 1425.172400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
348.8138   6.8736    2.6  46.9   46.7  10.5199   4.4 ------	UNKNOWN                       
 13.5966  31.0044    2.8  13.7   37.6   2.5578   4.1 ------	UNKNOWN                       
 54.2219  58.2103    2.8  25.1 -147.8   2.3880   4.1 ------	UNKNOWN                       
 60.3834  40.6244    2.9  26.9 -106.1   2.9614   4.0 ------	UNKNOWN                       
 36.7594 -12.8338    3.5  55.5  -20.4   7.3078   3.3 ------	UNKNOWN                       
131.6018  66.3973    4.3  58.7 -159.3  14.0384   2.7 ------	UNKNOWN                       
 42.2260 -14.9408    3.0  58.7  -26.0  14.6813   3.9 ------	UNKNOWN                       
 53.4370  -1.8794    7.2  50.7  -44.5   5.8768   1.6 ------	UNKNOWN                       
101.1388  52.0976    3.8  51.0 -135.6  10.8557   3.1 ------	UNKNOWN                       
 74.8109  31.0607    5.1  41.3  -97.9   9.1616   2.3 ------	UNKNOWN

Plot creation:
Sat May 30 16:30:14 EDT 2015