batgrbproduct analysis for trigger=450158

batgrbproduct Analysis for Trigger=450158

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 10 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Tue Mar 29 01:05:08 EDT 2011
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger450158/GCN5_download_cron
======================================================================

  Trigger: 00450158      Segment: 000

  BAT Trigger Time: 323009872   [s; MET]
      Trigger Stop: 323011080   [s; MET]
               UTC: 2011-03-28T12:57:45.200600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.233459410357   Dec: 57.5902460840076  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.6
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.6

  Flight Position:   [ source = BAT ]
    RA: 251.233459410357   Dec: 57.5902460840076  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 251.270799708315   Dec: 57.6114086794127  [deg; J2000]  
        { 16h 45m 05.0s , +57d 36' 41.1" }
         +/- 3.53296136814303 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.24385600250737 [arcmin] (formal 1-sigma fit error)
    SNR: 5.01259740418875
 
  Angular difference between Flight and Ground position is 1.747386 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 1208 +/- 
        Measured from: 0
                   to: 1208     [s; relative to TRIGTIME]
     T50: 1208 +/- 
        Measured from: 0
                   to: 1208     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 1208 second)
        Measured from: 0     
                   to: 1208     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 1208     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.889502   1.050149   0.496353   0.079871
           0.191919   0.200608   0.187019   0.187088 [error]
 Peak      0.889502   1.050149   0.496353   0.079871
           0.191919   0.200608   0.187019   0.187088 [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 2.85e-07 4.30e-07 4.87e-07 1.05e-06 1.52e-06 2.25e-06   erg/cm2
              Error 9.19e-08 9.84e-08 1.77e-07 7.75e-07 4.18e-07 9.63e-07   erg/cm2
Peak flux Power-law 1.41e-02 1.17e-02 6.63e-03 5.55e-03 3.49e-02 3.80e-02   ph/cm2/s
              Error 4.63e-03 2.68e-03 2.33e-03 3.80e-03 7.97e-03 8.87e-03   ph/cm2/s
 
Fluence   Cutoff-PL 2.69e-07 4.91e-07 4.34e-07 1.69e-07 1.32e-06 1.36e-06   erg/cm2
              Error 1.00e-07 1.17e-07 3.29e-07 8.99e-07 4.98e-07 1.13e-06   erg/cm2
Peak flux Cutoff-PL 1.31e-02 1.33e-02 6.12e-03 1.23e-03 3.36e-02 3.38e-02   ph/cm2/s
              Error 5.09e-03 4.13e-03 4.50e-03 7.15e-03 0.00e+00 0.00e+00   ph/cm2/s
 
Fluence        Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.822    0.410    -      -           2.51e-04 6.82e-05   53.210 57
CPL   1.002    2.627      48.5    0.0      7.78e-04 0.00e+00   52.400 56
 
The chi2 of BB fit is  which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.822    0.410    -      -           2.51e-04 6.82e-05   53.210 57
CPL   1.002    2.627      48.5    0.0      7.78e-04 0.00e+00   52.400 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 1208.000    0.000 1208.000
T90  1208.000    0.000 1208.000
T50  1208.000    0.000 1208.000
Peak 1208.000    0.000 1208.000

Click here for the BAT GCN circular template

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  251.2708 +57.6114 0.0384   39.8  -23.4       2.7272     5.0  TRIG_00450158       
------------------------------------------
 
Foreground time interval of the image:
 93.000 123.060 (delta_t =  30.060 [sec])
134.000 303.060 (delta_t = 169.060 [sec])
483.000 483.071 (delta_t =   0.071 [sec])
502.000 585.380 (delta_t =  83.380 [sec])
589.000 963.057 (delta_t = 374.056 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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)

The mask-weighted light curves based on cleaned DPHs

Spectra

Notes:

1) The fitting includes the systematic errors.
2) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82191     ( -0.394467   0.425092 )
Norm@50keV  : 2.50805E-04    ( -6.94028e-05   6.70456e-05 )
------------------------------------------------------------
# Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9336 for     57 degrees of freedom 
# Null hypothesis probability =   6.178694e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.48588E-02 ( -0.00796841  0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51504e-06 ( -4.08179e-07  4.28405e-07 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00164     ( -4.10578   1.14828 )
Epeak [keV] : 48.4684      (   )
Norm@50keV  : 7.77562E-04    (     )
------------------------------------------------------------
# Chi-Squared =          52.40 using 59 PHA bins.
# Reduced chi-squared =         0.9356 for     56 degrees of freedom 
# Null hypothesis probability =   6.120704e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.35598E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31795e-06 ( -4.52351e-07  5.44118e-07 ) ergs/cm2

Band function

Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96790   ( -61.4977   -61.4977 )
beta        : -2.20455    ( -1.20768   0.595655 )
Epeak [keV] : 26.7223      ( -17.6577 8.32798 )
Norm@50keV   : 24.0008    ( -20.4193   9.35813 )
------------------------------------------------------------
# Chi-Squared =          50.55 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     55 degrees of freedom 
# Null hypothesis probability =   6.450296e-01
 
Photon flux (15-150 keV)    in 656.6 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]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

Peak spectrum fit

Power-law model

Time interval is from  589.000 sec. to  963.057 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82191     ( -0.394467   0.425092 )
Norm@50keV  : 2.50805E-04    ( -6.94028e-05   6.70456e-05 )
------------------------------------------------------------
# Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9336 for     57 degrees of freedom 
# Null hypothesis probability =   6.178694e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.48588E-02 ( -0.00796841  0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51504e-06 ( -4.08179e-07  4.28405e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  589.000 sec. to  963.057 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00164     ( -4.10578   1.14828 )
Epeak [keV] : 48.4684      (   )
Norm@50keV  : 7.77562E-04    (     )
------------------------------------------------------------
# Chi-Squared =          52.40 using 59 PHA bins.
# Reduced chi-squared =         0.9356 for     56 degrees of freedom 
# Null hypothesis probability =   6.120704e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.35598E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31795e-06 ( -4.52351e-07  5.44118e-07 ) ergs/cm2

Band function

Time interval is from  589.000 sec. to  963.057 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96790   ( -61.4977   -61.4977 )
beta        : -2.20455    ( -1.20768   0.595655 )
Epeak [keV] : 26.7223      ( -17.6577 8.32798 )
Norm@50keV   : 24.0008    ( -20.4193   9.35813 )
------------------------------------------------------------
# Chi-Squared =          50.55 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     55 degrees of freedom 
# Null hypothesis probability =   6.450296e-01
 
Photon flux (15-150 keV)    in 656.6 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]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150

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: 1.82191     ( -0.394467   0.425092 )
Norm@50keV  : 2.50805E-04    ( -6.94028e-05   6.70456e-05 )
------------------------------------------------------------
# Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9336 for     57 degrees of freedom 
# Null hypothesis probability =   6.178694e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.48588E-02 ( -0.00796841  0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51504e-06 ( -4.08179e-07  4.28405e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00164     ( -4.10578   1.14828 )
Epeak [keV] : 48.4684      (   )
Norm@50keV  : 7.77562E-04    (     )
------------------------------------------------------------
# Chi-Squared =          52.40 using 59 PHA bins.
# Reduced chi-squared =         0.9356 for     56 degrees of freedom 
# Null hypothesis probability =   6.120704e-01
 
Photon flux (15-150 keV)    in 656.6 sec: 3.35598E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31795e-06 ( -4.52351e-07  5.44118e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96790   ( -61.4977   -61.4977 )
beta        : -2.20455    ( -1.20768   0.595655 )
Epeak [keV] : 26.7223      ( -17.6577 8.32798 )
Norm@50keV   : 24.0008    ( -20.4193   9.35813 )
------------------------------------------------------------
# Chi-Squared =          50.55 using 59 PHA bins.
# Reduced chi-squared =         0.9191 for     55 degrees of freedom 
# Null hypothesis probability =   6.450296e-01
 
Photon flux (15-150 keV)    in 656.6 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)  = 4.30073e-07
S(50-100 keV) = 4.86581e-07

T90 vs. Hardness ratio plot

T90                                   = 1208 sec.
Hardness ratio (energy fluence ratio) = 1.13139

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.1806
Count Ratio (50-100 keV) / (15-25 keV) = 0.558012

Mask shadow pattern

IMX = 7.640340869353240E-01, IMY = 3.300154914330649E-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:
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5035  35.4375    5.1  56.7   -3.7  -4.1471  -2.3    6.1	Her X-1                       
215.8859  57.7312    3.1  22.9   -7.2   1.4745   3.7 ------	UNKNOWN                       
254.2849  41.8197    3.5  51.8   -8.7   2.9003   3.3 ------	UNKNOWN                       
115.3996  47.4719    2.5  34.8 -160.7   2.2848   4.6 ------	UNKNOWN                       
 97.9497  27.1237    3.5  59.0 -166.1   9.1836   3.3 ------	UNKNOWN                       
265.1951  42.6239    4.6  56.5  -16.8   4.1341   2.5 ------	UNKNOWN                       
240.7335  77.2214    2.3  29.7  -54.1   2.6165   5.0 ------	UNKNOWN                       
264.2079  53.9266    2.6  47.7  -26.0   3.8425   4.5 ------	UNKNOWN                       
267.5291  45.3248    3.6  55.5  -20.5   4.7537   3.2 ------	UNKNOWN                       
267.0723  47.6614    2.6  53.5  -22.1   4.8125   4.4 ------	UNKNOWN                       
274.8133  46.7662    5.8  57.5  -26.3   5.0632   2.0 ------	UNKNOWN                       
 84.0576  41.2402    7.5  55.2 -144.9   3.9859   1.6 ------	UNKNOWN                       
 80.1223  49.1990    3.5  51.1 -135.7   7.7584   3.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
1367.300600 1379.300580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0012 -15.6659    2.3  30.5   80.8   0.3432   5.1    2.0	Sco X-1                       
256.0263 -37.8305    6.9  29.3   31.1  -0.0846  -1.7    2.1	4U 1700-377                   
256.3533 -36.3398   16.0  28.1   32.8   0.0365   0.7    6.4	GX 349+2                      
263.0049 -24.5962    8.4  16.1   47.1  -0.0551  -1.4    9.0	GX 1+4                        
264.7110 -44.4729 2700.0  31.3   13.0   0.0001   0.0    1.9	4U 1735-44                    
268.4661  -1.5525    9.0  15.5  144.7   0.0481   1.3    8.4	SW J1753.5-0127               
270.4481 -25.0733    6.5  11.7   25.0   0.0607   1.8    8.9	GX 5-1                        
270.1426 -25.7035   47.9  12.4   24.6  -0.0083  -0.2    9.0	GRS 1758-258                  
273.9055 -13.9547   10.7   2.7  105.3   0.0402   1.1    7.6	GX 17+2                       
275.9177 -30.5169    3.6  15.7   -1.3   0.1223   3.2    9.0	H1820-303                     
285.0326 -25.0689    5.2  12.9  -40.0  -0.0810  -2.2    8.9	HT1900.1-2455                 
288.8923  10.8935    4.0  28.5 -157.4   0.1153   2.9    6.4	GRS 1915+105                  
299.5284  35.2199    4.3  54.6 -160.5  -0.3278  -2.7    3.2	Cyg X-1                       
241.9408 -39.9091    2.1  39.2   40.1   0.4409   5.5 ------	UNKNOWN                       
272.4030 -70.0707    2.3  55.3   -1.7   0.7295   4.9 ------	UNKNOWN

Plot creation:
Tue Mar 29 01:21:54 EDT 2011