batgrbproduct Analysis for Trigger=518507
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): Sun Mar 25 22:23:22 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger518507/GCN5_download_cron
======================================================================
Trigger: 00518507 Segment: 000
BAT Trigger Time: 354261559.36 [s; MET]
Trigger Stop: 354261560.384 [s; MET]
UTC: 2012-03-24T05:59:11.334460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.084059291849 Dec: 24.1452774141341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.05
Image Trigger?: NO
Rate S/N Ratio: 89.9388681271896 [ if not an image trigger ]
Image S/N Ratio: 19.05
Flight Position: [ source = BAT ]
RA: 291.084059291849 Dec: 24.1452774141341 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.08119668687 Dec: 24.1399319535257 [deg; J2000]
{ 19h 24m 19.5s , +24d 08' 23.8" }
+/- 1.11729928446938 [arcmin] (estimated 90% radius based on SNR)
+/- 0.454369004181627 [arcmin] (formal 1-sigma fit error)
SNR: 25.9600054362593
Angular difference between Flight and Ground position is 0.356975 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 117.963999986649 +/- 9.59318427639077
Measured from: -41.6959999203682
to: 76.2680000662804 [s; relative to TRIGTIME]
T50: 30.7759999632835 +/- 0.714579609466133
Measured from: 3.98000007867813
to: 34.7560000419617 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.6759999990463
to: 34.6759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -150.512000024319
to: 142.455999970436 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.715155 5.334103 4.716206 1.489929
0.105341 0.102618 0.088465 0.073478 [error]
Peak 0.145096 0.249481 0.259175 0.077013
0.007659 0.008720 0.008701 0.006034 [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 1.13e-06 2.29e-06 3.63e-06 1.28e-05 1.01e-05 1.98e-05 erg/cm2
Error 5.82e-08 6.78e-08 9.33e-08 7.97e-07 2.36e-07 8.24e-07 erg/cm2
Peak flux Power-law 1.53e+00 1.87e+00 1.65e+00 2.52e+00 5.93e+00 7.57e+00 ph/cm2/s
Error 1.16e-01 8.54e-02 6.92e-02 2.28e-01 2.31e-01 2.95e-01 ph/cm2/s
Fluence Cutoff-PL 1.13e-06 2.29e-06 3.64e-06 1.27e-05 1.98e-05 0.00e+00 erg/cm2
Error 5.81e-08 6.77e-08 9.34e-08 8.90e-07 8.93e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.47e+00 1.88e+00 1.68e+00 2.16e+00 5.88e+00 7.20e+00 ph/cm2/s
Error 1.50e-01 8.97e-02 8.60e-02 4.98e-01 2.41e-01 5.66e-01 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 1.336 0.045 - - 3.54e-03 8.19e-05 44.580 57
CPL 1.331 0.085 9227.6 -188.2 3.55e-03 2.63e-04 44.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.177 0.066 - - 5.06e-02 1.89e-03 56.480 57
CPL 1.024 0.230 369.8 0.0 5.92e-02 1.41e-02 55.400 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: 97.920000 sec.
T50 in the 50-300 keV band: 29.888000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 292.968 -150.512 142.456
T90 117.964 -41.696 76.268
T50 30.776 3.980 34.756
Peak 1.000 33.676 34.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.0812 +24.1399 0.0074 30.9 -160.9 6.1646 26.0 TRIG_00518507
------------------------------------------
Foreground time interval of the image:
-150.512 -55.890 (delta_t = 94.622 [sec])
-54.360 11.941 (delta_t = 66.301 [sec])
Background time interval of the image:
-239.360 -150.512 (delta_t = 88.848 [sec])
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)
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
-150.512000 -55.890000
-54.360000 142.456000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33563 ( -0.0446905 0.0445196 )
Norm@50keV : 3.53765E-03 ( -8.19701e-05 8.18372e-05 )
------------------------------------------------------------
# Chi-Squared = 44.58 using 59 PHA bins.
# Reduced chi-squared = 0.7822 for 57 degrees of freedom
# Null hypothesis probability = 8.841953e-01
Photon flux (15-150 keV) in 291.4 sec: 0.424946 ( -0.0112015 0.011244 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01012e-05 ( -2.35852e-07 2.36038e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-150.512000 -55.890000
-54.360000 142.456000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33112 ( -0.125492 0.0449033 )
Epeak [keV] : 9227.59 ( -635.614 -1011.94 )
Norm@50keV : 3.55403E-03 ( -8.09814e-05 0.000445862 )
------------------------------------------------------------
# Chi-Squared = 44.63 using 59 PHA bins.
# Reduced chi-squared = 0.7970 for 56 degrees of freedom
# Null hypothesis probability = 8.627341e-01
Photon flux (15-150 keV) in 291.4 sec: 0.424631 ( -0.011121 0.009842 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97638e-05 ( -9.56841e-07 8.28916e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-150.512000 -55.890000
-54.360000 142.456000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03510 ( 1.03231 1.03231 )
beta : -1.33579 ( 1.33583 0.0448498 )
Epeak [keV] : 57.8064 ( -59.0048 -59.0048 )
Norm@50keV : 6.49607E-03 ( -0.00222173 268950 )
------------------------------------------------------------
# Chi-Squared = 44.58 using 59 PHA bins.
# Reduced chi-squared = 0.8106 for 55 degrees of freedom
# Null hypothesis probability = 8.412270e-01
Photon flux (15-150 keV) in 291.4 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] : 19.8094 ( )
R^2/D10^2 : 1.85728E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 459.37 using 59 PHA bins.
# Reduced chi-squared = 8.0591 for 57 degrees of freedom
# Null hypothesis probability = 2.995976e-64
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.110e-07 1.894e-08
25- 50 2.034e-06 7.751e-08
50-150 5.909e-06 2.142e-07
15-150 8.354e-06 2.011e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.81570 ( )
------------------------------------------------------------
# Chi-Squared = 149.68 using 59 PHA bins.
# Reduced chi-squared = 2.6259 for 57 degrees of freedom
# Null hypothesis probability = 2.963066e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.317e-06 6.691e-07
25- 50 2.534e-06 1.284e-06
50-150 5.558e-06 2.813e-06
15-150 9.410e-06 4.764e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44827 (-0.740086 0.785218)
R1^2/D10^2 : 0.215506 (-0.0541833 0.0784692)
kT2 [keV] : 35.2892 (-3.33487 4.44163)
R2^2/D10^2 : 2.30033E-03 (-0.000717409 0.000891655)
------------------------------------------------------------
# Chi-Squared = 54.00 using 59 PHA bins.
# Reduced chi-squared = 0.9818 for 55 degrees of freedom
# Null hypothesis probability = 5.128223e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.591e-07 7.999e-08
25- 50 2.386e-06 1.166e-07
50-150 6.757e-06 3.919e-07
15-150 1.010e-05 5.041e-07
Peak spectrum fit
Power-law model
Time interval is from 33.676 sec. to 34.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17705 ( -0.0665041 0.0663139 )
Norm@50keV : 5.06482E-02 ( -0.00189027 0.00188937 )
------------------------------------------------------------
# Chi-Squared = 56.48 using 59 PHA bins.
# Reduced chi-squared = 0.9910 for 57 degrees of freedom
# Null hypothesis probability = 4.943677e-01
Photon flux (15-150 keV) in 1 sec: 5.92658 ( -0.231072 0.23138 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17238e-07 ( -2.09372e-08 2.09763e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.676 sec. to 34.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02447 ( -0.262624 0.197075 )
Epeak [keV] : 369.823 ( -369.823 -369.823 )
Norm@50keV : 5.92078E-02 ( -0.0106661 0.0176065 )
------------------------------------------------------------
# Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 56 degrees of freedom
# Null hypothesis probability = 4.973552e-01
Photon flux (15-150 keV) in 1 sec: 5.88405 ( -0.24041 0.24072 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92357e-07 ( -1.74549e-07 1.98903e-07 ) ergs/cm2
Band function
Time interval is from 33.676 sec. to 34.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.17315E-02 ( -1.60184 -1.60184 )
beta : -1.21260 ( 1.21111 0.0825108 )
Epeak [keV] : 48.2289 ( -48.1387 198.966 )
Norm@50keV : 0.362972 ( -0.370349 1891.03 )
------------------------------------------------------------
# Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9989 for 55 degrees of freedom
# Null hypothesis probability = 4.770104e-01
Photon flux (15-150 keV) in 1 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] : 20.5737 ( )
R^2/D10^2 : 0.250557 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 197.19 using 59 PHA bins.
# Reduced chi-squared = 3.4595 for 57 degrees of freedom
# Null hypothesis probability = 2.467431e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.021e-08 1.480e-09
25- 50 1.026e-07 5.320e-09
50-150 3.229e-07 1.935e-08
15-150 4.457e-07 2.155e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 24.7519 ( )
------------------------------------------------------------
# Chi-Squared = 149.61 using 59 PHA bins.
# Reduced chi-squared = 2.6247 for 57 degrees of freedom
# Null hypothesis probability = 3.032353e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.163e-08 3.163e-08
25- 50 1.186e-07 6.080e-08
50-150 2.600e-07 1.333e-07
15-150 4.402e-07 2.252e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.40696 (-1.01397 1.1921)
R1^2/D10^2 : 3.97312 (-1.527 2.65004)
kT2 [keV] : 31.4644 (-3.2883 4.6106)
R2^2/D10^2 : 5.45139E-02 (-0.0197043 0.0245068)
------------------------------------------------------------
# Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9856 for 55 degrees of freedom
# Null hypothesis probability = 5.049573e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.519e-08 6.745e-09
25- 50 1.079e-07 1.023e-08
50-150 3.646e-07 3.865e-08
15-150 5.177e-07 5.165e-08
Plot creation:
Sun Mar 25 22:55:36 EDT 2012