batgrbproduct analysis for trigger=207281

batgrbproduct Analysis for Trigger=207281

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): Wed Jan 22 17:14:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger207281
======================================================================

  Trigger: 00207281      Segment: 000

  BAT Trigger Time: 167830992   [s; MET]
      Trigger Stop: 167831056   [s; MET]
               UTC: 2006-04-27T11:43:10.841740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 124.30315943152   Dec: 62.6173129548239  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.47
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.47

  Flight Position:   [ source = BAT ]
    RA: 124.30315943152   Dec: 62.6173129548239  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 124.201541706105   Dec: 62.6601382720296  [deg; J2000]  
        { 08h 16m 48.4s , +62d 39' 36.5" }
         +/- 2.19843321734575 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.25095979308777 [arcmin] (formal 1-sigma fit error)
    SNR: 9.87154492967367
 
  Angular difference between Flight and Ground position is 3.801946 arcmin
 
  Partial Coding Fraction: 0.7109375    [ including projection effects ]

  Duration
     T90: 62 +/- 16.4924225024706
        Measured from: -8
                   to: 54     [s; relative to TRIGTIME]
     T50: 28 +/- 10.295630140987
        Measured from: 1
                   to: 29     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2     
                   to: 3     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10     
                   to: 61     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.321440   0.349698   0.207970   0.043664
           0.043218   0.044698   0.038789   0.032704 [error]
 Peak      0.017149   0.009765   0.007076   0.000330
           0.005174   0.005399   0.004674   0.003769 [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 1.00e-07 1.46e-07 1.58e-07 3.20e-07 5.03e-07 7.25e-07   erg/cm2
              Error 2.10e-08 2.05e-08 3.90e-08 1.61e-07 8.83e-08 2.00e-07   erg/cm2
Peak flux Power-law 1.08e-01 8.65e-02 4.66e-02 3.66e-02 2.58e-01 2.78e-01   ph/cm2/s
              Error 7.13e-02 4.28e-02 3.62e-02 5.97e-02 1.26e-01 1.40e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.01e-07 1.46e-07 1.59e-07 2.93e-07 5.00e-07 7.07e-07   erg/cm2
              Error 2.11e-08 2.19e-08 2.94e-08 2.08e-07 8.88e-08 --------   erg/cm2
Peak flux Cutoff-PL 9.37e-02 9.91e-02 4.98e-02 1.20e-02 2.52e-01 2.55e-01   ph/cm2/s
              Error 8.95e-02 5.63e-02 4.37e-02 5.58e-02 1.89e-01 1.42e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 9.72e-02 9.63e-02 5.01e-02 1.49e-02 2.55e-01 2.60e-01   ph/cm2/s
              Error 8.97e-02 -------- -------- -------- 1.90e-01 --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.884    0.281    -      -           7.70e-04 1.36e-04   59.250 57
CPL   2.050    0.000      22.0    0.0      6.10e-04 0.00e+00   58.840 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.892    1.012    -      -           1.80e-03 1.44e-03   54.990 57
CPL   0.759    5.392      50.4    0.0      7.48e-03 0.00e+00   54.660 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   71.000  -10.000   61.000
T90    62.000   -8.000   54.000
T50    28.000    1.000   29.000
Peak    1.000    2.000    3.000

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
  124.2015    62.6601   0.0196    24.5120  -122.2254         0.8798484      9.872 TRIG_00207281                 
 
Foreground time interval of the image:
-10.000  61.000 (delta_t =  71.000 [sec])
Background time interval of the image:
-239.000 -10.000 (delta_t = 229.000 [sec])

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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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)

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  -10.000 sec. to   61.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.88352     ( -0.270405   0.291 )
Norm@50keV  : 7.70393E-04    ( -0.00013881   0.000133079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.25 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.934146e-01
 
Photon flux (15-150 keV)    in 71 sec: 0.109794 ( -0.015417  0.0154219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.02834e-07 ( -8.70531e-08  8.94983e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -10.000 sec. to   61.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.05045     (     )
Epeak [keV] : 21.9855      (   )
Norm@50keV  : 6.09817E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.84 using 59 PHA bins.
# Reduced chi-squared =          1.051 for     56 degrees of freedom 
# Null hypothesis probability =   3.717970e-01
 
Photon flux (15-150 keV)    in 71 sec: 0.109816 ( -0.0154114  0.015381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00015e-07 ( -8.67244e-08  9.0841e-08 ) ergs/cm2

Band function

Time interval is from  -10.000 sec. to   61.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.50737   ( 1.50741   1.50741 )
beta        : -1.88346    ( 1.88349   0.270134 )
Epeak [keV] : 15.3741      ( -15.3678 -15.3678 )
Norm@50keV   : 1.93541E-03    ( -0.00193557   1.56771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.25 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     55 degrees of freedom 
# Null hypothesis probability =   3.232710e-01
 
Photon flux (15-150 keV)    in 71 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]    : 9.78714  (-1.66954  2.19047)
R^2/D10^2   : 5.39256E-02  (-0.0286687   0.0560361)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.85 using 59 PHA bins.
# Reduced chi-squared =          1.331 for     57 degrees of freedom 
# Null hypothesis probability =   4.817757e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.412e-08   1.922e-08
25- 50  1.787e-07   4.345e-08
50-150  8.761e-08   3.482e-08
15-150  3.404e-07   7.416e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 88.2329       (-36.3992      94.8808)
Norm        : 0.496212       (-0.0960744     0.134526)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.05 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     57 degrees of freedom 
# Null hypothesis probability =   3.327069e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.187e-08   1.809e-08
25- 50  1.547e-07   3.053e-08
50-150  2.327e-07   1.365e-07
15-150  4.793e-07   1.372e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.68517        (-2.06829      1.95137)
R1^2/D10^2  : 0.183829        (-0.110904      0.546369)
kT2 [keV]   : 31.6406        (-13.3918      71.2215)
R2^2/D10^2  : 5.65917E-04    (-0.000525211   0.00226859)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.06 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     55 degrees of freedom 
# Null hypothesis probability =   2.974535e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.520e-08   4.182e-08
25- 50  1.498e-07   6.623e-08
50-150  2.807e-07   1.599e-07
15-150  5.257e-07   2.460e-07

Peak spectrum fit

Power-law model

Time interval is from    2.000 sec. to    3.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.89226     ( -0.840061   1.18349 )
Norm@50keV  : 1.80292E-03    ( -0.00180294   0.00107052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.99 using 59 PHA bins.
# Reduced chi-squared =         0.9648 for     57 degrees of freedom 
# Null hypothesis probability =   5.508138e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.257892 ( -0.126384  0.126394 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6575e-08 ( -9.53179e-09  1.05028e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    2.000 sec. to    3.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.758716     ( -9.34332   1.43986 )
Epeak [keV] : 50.3640      (   )
Norm@50keV  : 7.47521E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.66 using 59 PHA bins.
# Reduced chi-squared =         0.9761 for     56 degrees of freedom 
# Null hypothesis probability =   5.256976e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.251718 ( -0.251718  0.126166 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57643e-08 ( -8.82526e-09  1.06577e-08 ) ergs/cm2

Band function

Time interval is from    2.000 sec. to    3.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.948269   ( -1.00032   0.999672 )
beta        : -9.37167    ( 9.37166   19.3717 )
Epeak [keV] : 51.5672      ( -37.1263 -51.5582 )
Norm@50keV   : 5.89965E-03    ( -0.00590322   559845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.67 using 59 PHA bins.
# Reduced chi-squared =         0.9940 for     55 degrees of freedom 
# Null hypothesis probability =   4.871982e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.255183 ( 6.74482  -0.255183 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.58142e-08 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.5737  (-5.97346  8.98072)
R^2/D10^2   : 5.56114E-02  (-0.0556058   0.499088)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.20 using 59 PHA bins.
# Reduced chi-squared =         0.9684 for     57 degrees of freedom 
# Null hypothesis probability =   5.428697e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.864e-09   1.239e-09
25- 50  6.190e-09   3.988e-09
50-150  6.064e-09   4.695e-09
15-150  1.412e-08   9.375e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 81.5155       (-81.5538      -81.5538)
Norm        : 1.22522       (-0.654818     1.5501)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.73 using 59 PHA bins.
# Reduced chi-squared =         0.9603 for     57 degrees of freedom 
# Null hypothesis probability =   5.605371e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.183e-09   2.150e-09
25- 50  5.263e-09   3.539e-09
50-150  7.523e-09   6.930e-09
15-150  1.597e-08   1.195e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.16351        (-3.10933      15.2698)
R1^2/D10^2  : 7.66204        (-8.21374      -8.21374)
kT2 [keV]   : 15.1232        (-7.01864      -15.0585)
R2^2/D10^2  : 2.48359E-02    (-0.0252916   0.226985)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.95 using 59 PHA bins.
# Reduced chi-squared =         0.9810 for     55 degrees of freedom 
# Null hypothesis probability =   5.146546e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.164e-09   1.686e-09
25- 50  5.100e-09   3.319e-09
50-150  7.428e-09   5.565e-09
15-150  1.569e-08   1.000e-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: 1.88352     ( -0.270405   0.291 )
Norm@50keV  : 7.70393E-04    ( -0.00013881   0.000133079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.25 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.934146e-01
 
Photon flux (15-150 keV)    in 71 sec: 0.109794 ( -0.015417  0.0154219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.02834e-07 ( -8.70531e-08  8.94983e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.05045     (     )
Epeak [keV] : 21.9855      (   )
Norm@50keV  : 6.09817E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.84 using 59 PHA bins.
# Reduced chi-squared =          1.051 for     56 degrees of freedom 
# Null hypothesis probability =   3.717970e-01
 
Photon flux (15-150 keV)    in 71 sec: 0.109816 ( -0.0154114  0.015381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.00015e-07 ( -8.67244e-08  9.0841e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.50737   ( 1.50741   1.50741 )
beta        : -1.88346    ( 1.88349   0.270134 )
Epeak [keV] : 15.3741      ( -15.3678 -15.3678 )
Norm@50keV   : 1.93541E-03    ( -0.00193557   1.56771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.25 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     55 degrees of freedom 
# Null hypothesis probability =   3.232710e-01
 
Photon flux (15-150 keV)    in 71 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)  = 1.46e-07
S(50-100 keV) = 1.58e-07

T90 vs. Hardness ratio plot

T90                                   = 62 sec.
Hardness ratio (energy fluence ratio) = 1.08219

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.08791
Count Ratio (50-100 keV) / (15-25 keV) = 0.646995

Mask shadow pattern

IMX = -2.431519080151418E-01, IMY = 3.857386396362503E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:
-239.000000 -10.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 99.2261  53.7336    2.9  40.2 -124.4   1.1783   4.0 ------	UNKNOWN                       
101.1965  32.2919    3.5  55.2 -145.5   3.2077   3.2 ------	UNKNOWN                       
 56.0105  73.0346    2.4  41.0  -83.6   2.9652   4.8 ------	UNKNOWN

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

Time interval of the image:
-10.000000 61.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
253.8904  50.1251    2.0  42.7    6.1   0.7798   5.8 ------	UNKNOWN                       
118.4013  18.9445    2.6  57.9 -169.8   1.7660   4.4 ------	UNKNOWN                       
124.2014  62.6601    1.2  24.5 -122.2   0.8790   9.9 ------	UNKNOWN                       
306.7405  76.4988    2.8  39.9  -45.0   0.5481   4.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
119.100640 963.074200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6426  22.0044    1.1  49.0 -132.9  18.8367  10.5    0.8	Crab                          
166.0030  31.3604    2.5  40.9  113.8   6.1671   4.7 ------	UNKNOWN                       
118.1647  84.1392    3.3  21.6   -7.8   1.1948   3.5 ------	UNKNOWN                       
297.8707  81.4461    3.0  35.9   -4.5   1.8167   3.9 ------	UNKNOWN                       
 40.2721  79.2992    3.1  28.2  -29.1   1.2858   3.7 ------	UNKNOWN                       
 90.8742  12.7366    4.6  55.3 -145.2   6.3672   2.6 ------	UNKNOWN

Plot creation:
Sun May 31 13:34:39 EDT 2015