batgrbproduct Analysis for Trigger=505926
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): Thu Oct 20 22:18:10 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger505926/GCN5_download_cron
======================================================================
Trigger: 00505926 Segment: 000
BAT Trigger Time: 340785236.544 [s; MET]
Trigger Stop: 340785236.8 [s; MET]
UTC: 2011-10-20T06:33:49.058300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 287.026652923869 Dec: -37.9849220218857 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: NO
Rate S/N Ratio: 18.7349939951952 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 287.026652923869 Dec: -37.9849220218857 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 287.028738753442 Dec: -38.0304965082623 [deg; J2000]
{ 19h 08m 06.9s , -38d 01' 49.8" }
+/- 2.05880077700079 [arcmin] (estimated 90% radius based on SNR)
+/- 0.977372119418623 [arcmin] (formal 1-sigma fit error)
SNR: 10.8417132831382
Angular difference between Flight and Ground position is 2.736247 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 0.400000035762787 +/- 0.0932952353877014
Measured from: -0.0239999294281006
to: 0.376000106334686 [s; relative to TRIGTIME]
T50: 0.192000031471252 +/- 0.0452548414137844
Measured from: 0.0560001134872437
to: 0.248000144958496 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.316000044345856
to: 0.683999955654144 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0400000214576721
to: 0.391999959945679 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.028069 0.038016 0.027575 0.010067
0.005181 0.005220 0.004546 0.003502 [error]
Peak 0.030602 0.036208 0.032530 0.007809
0.007526 0.007196 0.006388 0.005152 [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 7.54e-09 1.50e-08 2.31e-08 7.82e-08 6.46e-08 1.24e-07 erg/cm2
Error 1.99e-09 2.37e-09 4.22e-09 3.20e-08 1.04e-08 3.47e-08 erg/cm2
Peak flux Power-law 2.61e-01 2.82e-01 2.15e-01 2.69e-01 8.60e-01 1.03e+00 ph/cm2/s
Error 9.33e-02 6.04e-02 5.20e-02 1.40e-01 1.69e-01 2.04e-01 ph/cm2/s
Fluence Cutoff-PL 7.54e-09 1.50e-08 2.31e-08 7.76e-08 6.45e-08 1.22e-07 erg/cm2
Error 1.99e-09 2.43e-09 4.21e-09 4.32e-08 1.04e-08 4.47e-08 erg/cm2
Peak flux Cutoff-PL 2.62e-01 2.82e-01 2.15e-01 2.67e-01 8.61e-01 1.02e+00 ph/cm2/s
Error 9.32e-02 6.44e-02 5.54e-02 2.13e-01 1.71e-01 2.48e-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 1.374 0.260 - - 1.54e-02 2.23e-03 45.720 57
CPL 1.365 1.243 9557.7 0.0 1.55e-02 1.04e-02 45.730 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.386 0.356 - - 7.08e-03 1.38e-03 65.490 57
CPL 1.383 1.852 9999.3 0.0 7.11e-03 1.35e-02 65.490 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 0.432 -0.040 0.392
T90 0.400 -0.024 0.376
T50 0.192 0.056 0.248
Peak 1.000 -0.316 0.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
287.0287 -38.0305 0.0177 18.4 68.6 0.1063 10.8 TRIG_00505926
------------------------------------------
Foreground time interval of the image:
-0.040 0.392 (delta_t = 0.432 [sec])
Background time interval of the image:
-28.443 -0.040 (delta_t = 28.403 [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 -0.040 sec. to 0.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37357 ( -0.260678 0.258834 )
Norm@50keV : 1.53900E-02 ( -0.00223007 0.00222431 )
------------------------------------------------------------
# Chi-Squared = 45.72 using 59 PHA bins.
# Reduced chi-squared = 0.8021 for 57 degrees of freedom
# Null hypothesis probability = 8.581709e-01
Photon flux (15-150 keV) in 0.432 sec: 1.86328 ( -0.276485 0.277286 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45991e-08 ( -1.03368e-08 1.04418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36540 ( -0.71838 1.767 )
Epeak [keV] : 9557.66 ( -1029.46 -1029.46 )
Norm@50keV : 1.54529E-02 ( -0.00224474 0.0184582 )
------------------------------------------------------------
# Chi-Squared = 45.73 using 59 PHA bins.
# Reduced chi-squared = 0.8165 for 56 degrees of freedom
# Null hypothesis probability = 8.348498e-01
Photon flux (15-150 keV) in 0.432 sec: 1.86495 ( -0.27872 0.27344 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44738e-08 ( -1.02185e-08 1.05067e-08 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.76333 ( -10.0285 -10.0285 )
beta : -1.42858 ( -0.299223 0.284309 )
Epeak [keV] : 23.5290 ( -23.5289 6.16959 )
Norm@50keV : 1401.70 ( -1400.94 457.877 )
------------------------------------------------------------
# Chi-Squared = 45.25 using 59 PHA bins.
# Reduced chi-squared = 0.8228 for 55 degrees of freedom
# Null hypothesis probability = 8.228427e-01
Photon flux (15-150 keV) in 0.432 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] : 16.4229 (-3.88559 5.48309)
R^2/D10^2 : 0.152048 (-0.149258 0.233098)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.384281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.641e-09 1.234e-09
25- 50 1.566e-08 3.927e-09
50-150 2.981e-08 9.476e-09
15-150 4.911e-08 1.186e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 7.70219 (-7.70219 -7.70219)
------------------------------------------------------------
# Chi-Squared = 47.80 using 59 PHA bins.
# Reduced chi-squared = 0.8385 for 57 degrees of freedom
# Null hypothesis probability = 8.023179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.284e-09 4.501e-09
25- 50 1.594e-08 8.739e-09
50-150 3.495e-08 1.915e-08
15-150 5.917e-08 3.249e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.67215 (-2.18433 2.68196)
R1^2/D10^2 : 1.57443 (-1.01704 3.57012)
kT2 [keV] : 39.6684 (-14.4652 100.709)
R2^2/D10^2 : 7.25258E-03 (-0.00677178 0.0230338)
------------------------------------------------------------
# Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7959 for 55 degrees of freedom
# Null hypothesis probability = 8.618627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.645e-09 4.312e-09
25- 50 1.574e-08 8.621e-09
50-150 4.380e-08 2.428e-08
15-150 6.718e-08 3.443e-08
Peak spectrum fit
Power-law model
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38581 ( -0.356629 0.355882 )
Norm@50keV : 7.08496E-03 ( -0.00138067 0.00137229 )
------------------------------------------------------------
# Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.059864e-01
Photon flux (15-150 keV) in 1 sec: 0.860077 ( -0.169135 0.169865 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86611e-08 ( -1.4826e-08 1.51081e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38261 ( -1.32889 2.37485 )
Epeak [keV] : 9999.27 ( )
Norm@50keV : 7.11105E-03 ( -0.00137332 0.0255843 )
------------------------------------------------------------
# Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 56 degrees of freedom
# Null hypothesis probability = 1.807055e-01
Photon flux (15-150 keV) in 1 sec: 0.860594 ( -0.17402 0.168646 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84704e-08 ( -1.57829e-08 1.52281e-08 ) ergs/cm2
Band function
Time interval is from -0.316 sec. to 0.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99998 ( -102490 -102490 )
beta : -1.40646 ( -0.389844 0.36879 )
Epeak [keV] : 21.1189 ( -20.4551 11.8067 )
Norm@50keV : 1901.08 ( -2331.61 4.12529e+06 )
------------------------------------------------------------
# Chi-Squared = 65.44 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 55 degrees of freedom
# Null hypothesis probability = 1.583565e-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] : 17.0578 (-4.32537 6.0846)
R^2/D10^2 : 6.24342E-02 (-0.0396345 0.107505)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.06 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.440023e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.696e-09 1.627e-09
25- 50 1.640e-08 6.243e-09
50-150 3.410e-08 1.433e-08
15-150 5.420e-08 2.277e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-92.8244 -200)
Norm : 3.54286 (-0.682656 0.682656)
------------------------------------------------------------
# Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 57 degrees of freedom
# Null hypothesis probability = 1.857829e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.822e-09 4.960e-09
25- 50 1.697e-08 9.430e-09
50-150 3.722e-08 2.061e-08
15-150 6.301e-08 3.499e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37884 (-3.96927 5.84483)
R1^2/D10^2 : 1.16573 (-1.01355 105.651)
kT2 [keV] : 27.8184 (-10.732 157.167)
R2^2/D10^2 : 1.03706E-02 (-0.0102313 0.0467388)
------------------------------------------------------------
# Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.531065e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.160e-09 4.905e-09
25- 50 1.562e-08 8.220e-09
50-150 4.490e-08 2.683e-08
15-150 6.868e-08 3.739e-08
Plot creation:
Thu Oct 20 22:39:37 EDT 2011