batgrbproduct Analysis for Trigger=519868
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 Apr 11 18:10:42 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger519868/GCN5_download_cron
======================================================================
Trigger: 00519868 Segment: 000
BAT Trigger Time: 355792121.292 [s; MET]
Trigger Stop: 355792121.356 [s; MET]
UTC: 2012-04-10T23:08:33.204080 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.153069804651 Dec: -20.4101607138307 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.31
Image Trigger?: NO
Rate S/N Ratio: 109.453186340097 [ if not an image trigger ]
Image S/N Ratio: 16.31
Flight Position: [ source = BAT ]
RA: 272.153069804651 Dec: -20.4101607138307 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.163097062185 Dec: -20.4052805464038 [deg; J2000]
{ 18h 08m 39.1s , -20d 24' 19.0" }
+/- 1.30930471097188 [arcmin] (estimated 90% radius based on SNR)
+/- 0.407961168316476 [arcmin] (formal 1-sigma fit error)
SNR: 20.6974735569167
Angular difference between Flight and Ground position is 0.635367 arcmin
Partial Coding Fraction: 0.1621094 [ including projection effects ]
Duration
T90: 0.76800000667572 +/- 0.319999992847443
Measured from: -0.0599998831748962
to: 0.708000123500824 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/- 0.064
Measured from: 0.00400012731552124
to: 0.0680001378059387 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0799999833106995
to: 0.920000016689301 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 0.96399998664856 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.423494 0.405031 0.111920 0.021400
0.027440 0.026169 0.016781 0.011992 [error]
Peak 0.413815 0.403871 0.112792 0.021546
0.027277 0.025925 0.016571 0.011797 [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 1.98e-07 1.70e-07 9.98e-08 8.78e-08 5.05e-07 5.55e-07 erg/cm2
Error 2.04e-08 1.39e-08 1.47e-08 2.38e-08 4.14e-08 5.08e-08 erg/cm2
Peak flux Power-law 6.47e+00 3.11e+00 9.08e-01 3.35e-01 1.07e+01 1.08e+01 ph/cm2/s
Error 6.81e-01 2.51e-01 1.28e-01 8.43e-02 8.84e-01 8.85e-01 ph/cm2/s
Fluence Cutoff-PL 1.71e-07 2.10e-07 8.83e-08 9.06e-09 4.78e-07 0.00e+00 erg/cm2
Error 2.39e-08 2.06e-08 1.94e-08 9.41e-09 4.20e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.47e+00 3.77e+00 8.31e-01 4.49e-02 1.01e+01 1.01e+01 ph/cm2/s
Error 8.11e-01 3.71e-01 1.75e-01 4.35e-02 9.18e-01 9.21e-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 2.767 0.149 - - 4.53e-02 5.00e-03 64.450 57
CPL 0.922 0.913 22.8 9.8 5.73e-01 1.14e+00 47.450 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.774 0.148 - - 4.55e-02 5.01e-03 67.300 57
CPL 0.856 0.927 23.3 9.2 6.37e-01 1.30e+00 49.130 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 -0.060 0.964
T90 0.768 -0.060 0.708
T50 0.064 0.004 0.068
Peak 1.000 -0.080 0.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1631 -20.4053 0.0093 51.2 174.6 1.0155 20.7 TRIG_00519868
------------------------------------------
Foreground time interval of the image:
-0.060 0.964 (delta_t = 1.024 [sec])
Background time interval of the image:
-149.791 -0.060 (delta_t = 149.731 [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 -0.060 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.76741 ( -0.144885 0.153956 )
Norm@50keV : 4.52649E-02 ( -0.00504191 0.00496746 )
------------------------------------------------------------
# Chi-Squared = 64.45 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.321975e-01
Photon flux (15-150 keV) in 1.024 sec: 10.5695 ( -0.872556 0.874567 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.05295e-07 ( -4.13719e-08 4.14636e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.922494 ( -0.988432 0.837214 )
Epeak [keV] : 22.8142 ( -13.5608 6.09579 )
Norm@50keV : 0.572928 ( -0.572942 1.70229 )
------------------------------------------------------------
# Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8474 for 56 degrees of freedom
# Null hypothesis probability = 7.849544e-01
Photon flux (15-150 keV) in 1.024 sec: 10.0058 ( -0.90653 0.9102 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78106e-07 ( -4.13143e-08 4.2752e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907783 ( -0.544431 1.12619 )
beta : -4.76321 ( 4.51981 1.16389 )
Epeak [keV] : 23.1406 ( -12.0943 6.11517 )
Norm@50keV : 0.574805 ( -0.353451 2.27381 )
------------------------------------------------------------
# Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8577 for 55 degrees of freedom
# Null hypothesis probability = 7.644484e-01
Photon flux (15-150 keV) in 1.024 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] : 7.93553 (-0.607918 0.636148)
R^2/D10^2 : 11.5075 (-3.30288 4.77631)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.93 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.046507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.334e-07 1.746e-08
25- 50 2.302e-07 2.063e-08
50-150 5.884e-08 1.437e-08
15-150 4.224e-07 3.860e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.7053 (-3.88159 4.55147)
Norm : 87.7313 (-13.5932 16.3922)
------------------------------------------------------------
# Chi-Squared = 48.14 using 59 PHA bins.
# Reduced chi-squared = 0.8446 for 57 degrees of freedom
# Null hypothesis probability = 7.921406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.786e-07 1.894e-08
25- 50 1.991e-07 1.695e-08
50-150 1.028e-07 2.233e-08
15-150 4.806e-07 4.019e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.48158 (-1.17002 1.54364)
R1^2/D10^2 : 214.372 (-169.467 743.505)
kT2 [keV] : 9.66319 (-1.17905 1.89654)
R2^2/D10^2 : 4.01446 (-2.57369 3.67712)
------------------------------------------------------------
# Chi-Squared = 46.17 using 59 PHA bins.
# Reduced chi-squared = 0.8395 for 55 degrees of freedom
# Null hypothesis probability = 7.959019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.749e-07 7.575e-08
25- 50 2.060e-07 6.922e-08
50-150 8.639e-08 3.273e-08
15-150 4.673e-07 1.517e-07
Peak spectrum fit
Power-law model
Time interval is from -0.080 sec. to 0.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.77407 ( -0.143238 0.152309 )
Norm@50keV : 4.55379E-02 ( -0.0050449 0.00496878 )
------------------------------------------------------------
# Chi-Squared = 67.30 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 57 degrees of freedom
# Null hypothesis probability = 1.650340e-01
Photon flux (15-150 keV) in 1 sec: 10.6814 ( -0.883353 0.885487 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97675e-07 ( -4.07148e-08 4.07922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.080 sec. to 0.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.856031 ( -1.00644 0.848361 )
Epeak [keV] : 23.3284 ( -12.56 5.81977 )
Norm@50keV : 0.636914 ( -0.636982 1.96485 )
------------------------------------------------------------
# Chi-Squared = 49.13 using 59 PHA bins.
# Reduced chi-squared = 0.8772 for 56 degrees of freedom
# Null hypothesis probability = 7.305570e-01
Photon flux (15-150 keV) in 1 sec: 10.1113 ( -0.91643 0.92 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71945e-07 ( -4.0675e-08 4.1934e-08 ) ergs/cm2
Band function
Time interval is from -0.080 sec. to 0.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.773260 ( -0.620533 1.10979 )
beta : -4.41420 ( 4.37726 0.991306 )
Epeak [keV] : 23.7246 ( -11.4533 5.42909 )
Norm@50keV : 0.723075 ( -0.386734 2.89347 )
------------------------------------------------------------
# Chi-Squared = 48.56 using 59 PHA bins.
# Reduced chi-squared = 0.8829 for 55 degrees of freedom
# Null hypothesis probability = 7.175165e-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] : 7.92225 (-0.604476 0.632308)
R^2/D10^2 : 11.7639 (-3.36357 4.85635)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.58 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.848256e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.325e-07 1.750e-08
25- 50 2.281e-07 2.240e-08
50-150 5.798e-08 1.418e-08
15-150 4.186e-07 3.515e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.6553 (-3.84362 4.48806)
Norm : 89.0087 (-13.7168 16.52)
------------------------------------------------------------
# Chi-Squared = 50.01 using 59 PHA bins.
# Reduced chi-squared = 0.8774 for 57 degrees of freedom
# Null hypothesis probability = 7.325105e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.768e-07 1.940e-08
25- 50 1.969e-07 1.625e-08
50-150 1.014e-07 2.160e-08
15-150 4.752e-07 4.405e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.52128 (-1.25858 1.69497)
R1^2/D10^2 : 197.660 (-158.212 2178.77)
kT2 [keV] : 9.58362 (-1.1772 2.04272)
R2^2/D10^2 : 4.23158 (-2.86601 4.09121)
------------------------------------------------------------
# Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8773 for 55 degrees of freedom
# Null hypothesis probability = 7.282284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.715e-07 8.201e-08
25- 50 2.053e-07 7.346e-08
50-150 8.407e-08 3.663e-08
15-150 4.608e-07 1.625e-07
Plot creation:
Wed Apr 11 18:23:45 EDT 2012