batgrbproduct Analysis for Trigger=506291
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 Oct 26 17:58:06 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger506291/GCN5_download_cron
======================================================================
Trigger: 00506291 Segment: 000
BAT Trigger Time: 341304456.512 [s; MET]
Trigger Stop: 341304456.768 [s; MET]
UTC: 2011-10-26T06:47:29.005720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.274664858183 Dec: -47.495033090842 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.37
Image Trigger?: NO
Rate S/N Ratio: 13.0384048104053 [ if not an image trigger ]
Image S/N Ratio: 8.37
Flight Position: [ source = BAT ]
RA: 244.274664858183 Dec: -47.495033090842 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.256090631386 Dec: -47.4347390192992 [deg; J2000]
{ 16h 17m 01.5s , -47d 26' 05.1" }
+/- 1.84099386236947 [arcmin] (estimated 90% radius based on SNR)
+/- 0.820231077420185 [arcmin] (formal 1-sigma fit error)
SNR: 12.7195626594846
Angular difference between Flight and Ground position is 3.695266 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 3.62399995326996 +/- 1.10688933082492
Measured from: 0.00400006771087646
to: 3.62800002098083 [s; relative to TRIGTIME]
T50: 1.05999994277954 +/- 0.511613105668286
Measured from: 0.412000119686127
to: 1.47200006246567 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0920000076293945
to: 4.07199996709824 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.090120 0.128141 0.064700 0.010739
0.012969 0.012172 0.010155 0.008355 [error]
Peak 0.040737 0.065734 0.030857 0.009975
0.006629 0.006580 0.005404 0.004215 [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 2.75e-08 4.50e-08 5.57e-08 1.36e-07 1.67e-07 2.65e-07 erg/cm2
Error 5.14e-09 5.38e-09 9.67e-09 4.92e-08 2.29e-08 5.79e-08 erg/cm2
Peak flux Power-law 3.85e-01 3.81e-01 2.65e-01 2.90e-01 1.15e+00 1.32e+00 ph/cm2/s
Error 8.16e-02 5.11e-02 4.36e-02 9.63e-02 1.48e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 2.59e-08 4.79e-08 5.58e-08 5.79e-08 1.58e-07 1.87e-07 erg/cm2
Error 5.79e-09 7.12e-09 1.07e-08 8.75e-08 2.64e-08 8.57e-08 erg/cm2
Peak flux Cutoff-PL 3.61e-01 4.06e-01 2.70e-01 1.46e-01 1.12e+00 1.18e+00 ph/cm2/s
Error 9.29e-02 7.12e-02 4.82e-02 1.69e-01 1.54e-01 2.37e-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 1.692 0.211 - - 4.32e-03 5.59e-04 59.110 57
CPL 1.153 0.733 70.8 -23.6 8.53e-03 1.36e-02 57.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.527 0.217 - - 9.11e-03 1.20e-03 64.120 57
CPL 0.991 1.054 85.3 -25.4 1.80e-02 4.56e-02 63.280 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: 1.024000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.164 -0.092 4.072
T90 3.624 0.004 3.628
T50 1.060 0.412 1.472
Peak 1.000 0.000 1.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.2561 -47.4347 0.0152 14.7 -149.8 0.2899 12.7 TRIG_00506291
------------------------------------------
Foreground time interval of the image:
-0.092 4.072 (delta_t = 4.164 [sec])
Background time interval of the image:
-239.512 -0.092 (delta_t = 239.420 [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 -0.092 sec. to 4.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69225 ( -0.20879 0.213803 )
Norm@50keV : 4.32113E-03 ( -0.000563415 0.000555098 )
------------------------------------------------------------
# Chi-Squared = 59.11 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.983119e-01
Photon flux (15-150 keV) in 4.164 sec: 0.572349 ( -0.0685777 0.068661 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66699e-07 ( -2.26539e-08 2.30536e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 4.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15269 ( -1.01973 0.446401 )
Epeak [keV] : 70.7842 ( -23.6006 -70.785 )
Norm@50keV : 8.53079E-03 ( -0.00486315 0.0224086 )
------------------------------------------------------------
# Chi-Squared = 57.85 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 56 degrees of freedom
# Null hypothesis probability = 4.068732e-01
Photon flux (15-150 keV) in 4.164 sec: 0.558993 ( -0.035952 0.07151 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57834e-07 ( -2.61349e-08 2.663e-08 ) ergs/cm2
Band function
Time interval is from -0.092 sec. to 4.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15271 ( 1.21847 0.911163 )
beta : -10.00000 ( 1.47175e+11 1.47175e+11 )
Epeak [keV] : 70.7713 ( -23.9072 -70.7713 )
Norm@50keV : 8.52981E-03 ( -0.00434724 0.0223613 )
------------------------------------------------------------
# Chi-Squared = 57.85 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.705762e-01
Photon flux (15-150 keV) in 4.164 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] : 11.8488 (-1.62471 1.99246)
R^2/D10^2 : 0.145366 (-0.0635919 0.106449)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.18 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.128013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.795e-08 3.835e-09
25- 50 5.566e-08 9.875e-09
50-150 4.659e-08 1.481e-08
15-150 1.202e-07 2.074e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.570 (-23.6941 -100.392)
Norm : 2.43589 (-0.345944 0.436708)
------------------------------------------------------------
# Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.429277e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.639e-08 4.331e-09
25- 50 4.744e-08 6.267e-09
50-150 8.588e-08 1.534e-08
15-150 1.597e-07 2.065e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.84428 (-2.40086 2.33856)
R1^2/D10^2 : 0.486925 (-0.275775 0.443779)
kT2 [keV] : 28.7326 (-18.7205 58.3525)
R2^2/D10^2 : 3.93733E-03 (-0.0037481 0.0180645)
------------------------------------------------------------
# Chi-Squared = 56.69 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.117234e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.440e-08 1.176e-08
25- 50 5.075e-08 2.238e-08
50-150 8.723e-08 4.740e-08
15-150 1.624e-07 7.338e-08
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52677 ( -0.216449 0.217322 )
Norm@50keV : 9.11320E-03 ( -0.00120372 0.00119422 )
------------------------------------------------------------
# Chi-Squared = 64.12 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.410697e-01
Photon flux (15-150 keV) in 1 sec: 1.14607 ( -0.147689 0.147899 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.60881e-08 ( -1.22871e-08 1.246e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.991362 ( -1.33078 0.777985 )
Epeak [keV] : 85.3385 ( -34.8078 -85.6763 )
Norm@50keV : 1.79515E-02 ( -0.0097159 0.0814347 )
------------------------------------------------------------
# Chi-Squared = 63.28 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.350485e-01
Photon flux (15-150 keV) in 1 sec: 1.12385 ( -0.155182 0.15363 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1388e-08 ( -1.56884e-08 1.5109e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.565801 ( -2.55961 -0.59039 )
beta : -1.99238 ( -0.769105 0.480091 )
Epeak [keV] : 45.6932 ( -20.8705 49.9242 )
Norm@50keV : 0.167294 ( -0.190119 115.446 )
------------------------------------------------------------
# Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 3.026346e-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] : 12.3904 (-1.65119 2.0627)
R^2/D10^2 : 0.259081 (-0.1121 0.179253)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.41 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 57 degrees of freedom
# Null hypothesis probability = 1.092151e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.430e-09 1.992e-09
25- 50 2.753e-08 5.165e-09
50-150 2.595e-08 7.395e-09
15-150 6.191e-08 1.042e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-95.3318 -199.648)
Norm : 4.69209 (-0.592594 0.595191)
------------------------------------------------------------
# Chi-Squared = 63.35 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.622899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.168e-08 6.260e-09
25- 50 2.248e-08 1.199e-08
50-150 4.929e-08 2.660e-08
15-150 8.345e-08 4.532e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.1623 (-1.65147 1.64224)
R1^2/D10^2 : 0.469548 (-0.205621 0.376437)
kT2 [keV] : 199.059 ( )
R2^2/D10^2 : 1.32722E-04 (-5.10961e-05 0.00187963)
------------------------------------------------------------
# Chi-Squared = 55.60 using 59 PHA bins.
# Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.519893e-01
# Null hypothesis probability = 4.533039e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.012e-08 3.035e-09
25- 50 2.665e-08 7.020e-09
50-150 4.871e-08 2.794e-08
15-150 8.549e-08 3.221e-08
Plot creation:
Wed Oct 26 18:13:38 EDT 2011