batgrbproduct Analysis for Trigger=518200
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): Wed Mar 21 02:38:16 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger518200/GCN5_download_cron
======================================================================
Trigger: 00518200 Segment: 000
BAT Trigger Time: 353937383.616 [s; MET]
Trigger Stop: 353937410.496 [s; MET]
UTC: 2012-03-20T11:56:15.603640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.53789490183 Dec: 8.68498369747149 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.06
Image Trigger?: NO
Rate S/N Ratio: 12.9614813968157 [ if not an image trigger ]
Image S/N Ratio: 10.06
Flight Position: [ source = BAT ]
RA: 212.53789490183 Dec: 8.68498369747149 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.516793094668 Dec: 8.68105496868008 [deg; J2000]
{ 14h 10m 04.0s , +08d 40' 51.8" }
+/- 1.63599637720323 [arcmin] (estimated 90% radius based on SNR)
+/- 0.736278568894815 [arcmin] (formal 1-sigma fit error)
SNR: 15.0561884009324
Angular difference between Flight and Ground position is 1.273602 arcmin
Partial Coding Fraction: 0.6015625 [ including projection effects ]
Duration
T90: 26.1759999394417 +/- 2.81463887717136
Measured from: 0.568000137805939
to: 26.7440000772476 [s; relative to TRIGTIME]
T50: 14.379999935627 +/- 2.81720219243167
Measured from: 8.01200014352798
to: 22.392000079155 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 24.0960000157356
to: 25.0960000157356 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.356000006198883
to: 28.5960000157356 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.282964 0.353868 0.287021 0.039261
0.040578 0.036532 0.031782 0.027360 [error]
Peak 0.020068 0.014868 0.025212 0.010548
0.007452 0.006922 0.005918 0.005136 [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 8.33e-08 1.52e-07 2.12e-07 6.22e-07 6.09e-07 1.07e-06 erg/cm2
Error 1.53e-08 1.73e-08 3.04e-08 1.89e-07 7.41e-08 2.13e-07 erg/cm2
Peak flux Power-law 1.33e-01 1.62e-01 1.43e-01 2.17e-01 5.14e-01 6.55e-01 ph/cm2/s
Error 8.08e-02 6.03e-02 4.74e-02 1.62e-01 1.62e-01 2.03e-01 ph/cm2/s
Fluence Cutoff-PL 6.86e-08 1.69e-07 2.21e-07 1.52e-07 6.11e-07 0.00e+00 erg/cm2
Error 1.83e-08 2.20e-08 3.56e-08 1.62e-07 1.80e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.11e-01 1.72e-01 1.53e-01 9.58e-02 4.92e-01 5.32e-01 ph/cm2/s
Error 1.09e-01 7.35e-02 5.97e-02 2.14e-01 1.96e-01 2.87e-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 1.514 0.186 - - 2.22e-03 2.48e-04 59.590 57
CPL 0.360 0.922 69.4 33.3 8.59e-03 1.22e-02 53.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.180 0.555 - - 4.39e-03 1.32e-03 65.880 57
CPL 0.366 8.404 105.1 0.0 1.08e-02 7.68e+01 65.710 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: 24.320000 sec.
T50 in the 50-300 keV band: 19.072000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.952 -0.356 28.596
T90 26.176 0.568 26.744
T50 14.380 8.012 22.392
Peak 1.000 24.096 25.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.5168 +8.6811 0.0128 23.7 117.9 1.0682 15.1 TRIG_00518200
------------------------------------------
Foreground time interval of the image:
-0.356 28.596 (delta_t = 28.952 [sec])
Background time interval of the image:
-239.616 -0.356 (delta_t = 239.260 [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
Time interval is from -0.356 sec. to 28.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51443 ( -0.185712 0.187155 )
Norm@50keV : 2.22319E-03 ( -0.000249012 0.000247907 )
------------------------------------------------------------
# Chi-Squared = 59.59 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.815207e-01
Photon flux (15-150 keV) in 28.95 sec: 0.278632 ( -0.0310726 0.0311552 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09149e-07 ( -7.36725e-08 7.46065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.356 sec. to 28.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.360233 ( -1.02167 0.822065 )
Epeak [keV] : 69.3514 ( -14.2409 52.2774 )
Norm@50keV : 8.58633E-03 ( -0.00523289 0.0190734 )
------------------------------------------------------------
# Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9538 for 56 degrees of freedom
# Null hypothesis probability = 5.733903e-01
Photon flux (15-150 keV) in 28.95 sec: 0.263235 ( -0.032784 0.032879 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11357e-07 ( -1.20617e-07 2.39176e-07 ) ergs/cm2
Band function
Time interval is from -0.356 sec. to 28.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.360092 ( -0.629585 1.37114 )
beta : -10.00000 ( 1.04272e+10 1.04272e+10 )
Epeak [keV] : 69.3373 ( -14.2389 52.2715 )
Norm@50keV : 8.58814E-03 ( -0.00523503 0.0190939 )
------------------------------------------------------------
# Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9711 for 55 degrees of freedom
# Null hypothesis probability = 5.354617e-01
Photon flux (15-150 keV) in 28.95 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] : 14.6359 (-1.75776 2.04293)
R^2/D10^2 : 3.48678E-02 (-0.0129709 0.0201557)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.362036e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.544e-08 1.012e-08
25- 50 1.764e-07 2.907e-08
50-150 2.544e-07 5.851e-08
15-150 4.763e-07 7.339e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.7792 -199.993)
Norm : 1.14390 (-0.123628 0.124193)
------------------------------------------------------------
# Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 0.9945 for 57 degrees of freedom
# Null hypothesis probability = 4.868975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.246e-08 4.387e-08
25- 50 1.586e-07 8.303e-08
50-150 3.479e-07 1.835e-07
15-150 5.890e-07 3.163e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.98199 (-3.08805 4.56733)
R1^2/D10^2 : 0.220122 (-0.162531 1.48173)
kT2 [keV] : 20.3147 (-4.80089 18.5824)
R2^2/D10^2 : 8.65244E-03 (-0.0080324 0.0174106)
------------------------------------------------------------
# Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9618 for 55 degrees of freedom
# Null hypothesis probability = 5.552709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.958e-08 3.969e-08
25- 50 1.675e-07 8.519e-08
50-150 3.167e-07 1.835e-07
15-150 5.537e-07 2.833e-07
Peak spectrum fit
Power-law model
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18035 ( -0.577427 0.531759 )
Norm@50keV : 4.38835E-03 ( -0.00131992 0.00131207 )
------------------------------------------------------------
# Chi-Squared = 65.88 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.966384e-01
Photon flux (15-150 keV) in 1 sec: 0.513726 ( -0.160589 0.162941 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47729e-08 ( -1.41608e-08 1.4424e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.365598 ( -10.0484 6.75989 )
Epeak [keV] : 105.101 ( -104.224 -104.224 )
Norm@50keV : 1.07982E-02 ( -0.011001 153.527 )
------------------------------------------------------------
# Chi-Squared = 65.71 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 56 degrees of freedom
# Null hypothesis probability = 1.758977e-01
Photon flux (15-150 keV) in 1 sec: 0.492497 ( -0.213755 0.178367 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.44237e-08 ( -3.09847e-08 1.10191e-07 ) ergs/cm2
Band function
Time interval is from 24.096 sec. to 25.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.673258 ( 0.532039 0.532039 )
beta : -1.94364 ( 1.46831 1.73392 )
Epeak [keV] : 72.2983 ( -72.1301 252.809 )
Norm@50keV : 3.45870E-02 ( -0.0346833 16.1163 )
------------------------------------------------------------
# Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.643780e-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] : 17.3725 (-4.70809 8.43948)
R^2/D10^2 : 3.82719E-02 (-0.0382718 0.075232)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 66.04 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.928060e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.338e-09 1.503e-09
25- 50 1.052e-08 6.295e-09
50-150 2.283e-08 1.448e-08
15-150 3.569e-08 2.136e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-109.521 -199.996)
Norm : 2.17081 (-0.659017 0.659016)
------------------------------------------------------------
# Chi-Squared = 67.13 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.686673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.405e-09 3.171e-09
25- 50 1.040e-08 6.025e-09
50-150 2.281e-08 1.374e-08
15-150 3.861e-08 2.382e-08
Double BB
------------------------------------------------------------
# Chi-Squared = 65.80 using 59 PHA bins.
# Chi-Squared = 64.46 using 59 PHA bins.
# Chi-Squared = 64.24 using 59 PHA bins.
# Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 1.510965e-01
# Null hypothesis probability = 1.793573e-01
# Null hypothesis probability = 1.844425e-01
# Null hypothesis probability = 1.857790e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.326e-09 1.503e-09
25- 50 1.007e-08 6.235e-09
50-150 2.364e-08 1.539e-08
15-150 3.703e-08 2.239e-08
Plot creation:
Wed Mar 21 03:02:11 EDT 2012