batgrbproduct Analysis for Trigger=213823
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Tue Jan 1 16:12:19 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger213823/SDC
======================================================================
Trigger: 00213823 Segment: 000
BAT Trigger Time: 171349934.592 [s; MET]
Trigger Stop: 171349935.616 [s; MET]
UTC: 2006-06-07T05:12:13.351500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 329.711869958478 Dec: -22.5057942155925 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.77
Image Trigger?: NO
Rate S/N Ratio: 32.6190128606002 [ if not an image trigger ]
Image S/N Ratio: 14.77
Flight Position: [ source = BAT ]
RA: 329.711869958478 Dec: -22.5057942155925 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 329.703510915602 Dec: -22.4968916428923 [deg; J2000]
{ 21h 58m 48.8s , -22d 29' 48.8" }
+/- 0.815076545772999 [arcmin] (estimated 90% radius based on SNR)
+/- 0.254317151521545 [arcmin] (formal 1-sigma fit error)
SNR: 40.735946713108
RA = 21h 58m 48.8s (329.703511 deg.)
Dec = -22d 29' 49" (-22.496892 deg.)
Angular difference between Flight and Ground position is 0.707124 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 99.3000000119209 +/- 31.0697613299411
Measured from: -3.4839999973774
to: 95.8160000145435 [s; relative to TRIGTIME]
T50: 24.8480000197887 +/- 2.28422417615213
Measured from: 1.62799999117851
to: 26.4760000109673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.967999994754791
to: 0.0320000052452087 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.1159999966621
to: 102.252000004053 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.092703 1.529130 1.148579 0.246847
0.050968 0.052025 0.046237 0.039522 [error]
Peak 0.037216 0.062653 0.060392 0.019796
0.005025 0.005531 0.005094 0.004064 [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 3.36e-07 6.27e-07 9.02e-07 2.75e-06 2.57e-06 4.62e-06 erg/cm2
Error 2.66e-08 2.86e-08 4.67e-08 3.24e-07 1.13e-07 3.52e-07 erg/cm2
Peak flux Power-law 3.46e-01 4.35e-01 3.98e-01 6.36e-01 1.40e+00 1.82e+00 ph/cm2/s
Error 6.37e-02 4.80e-02 4.04e-02 1.42e-01 1.30e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 3.11e-07 6.44e-07 9.27e-07 1.71e-06 2.51e-06 3.58e-06 erg/cm2
Error 3.34e-08 3.24e-08 5.24e-08 6.97e-07 1.25e-07 7.00e-07 erg/cm2
Peak flux Cutoff-PL 3.46e-01 4.35e-01 3.99e-01 6.32e-01 1.40e+00 1.81e+00 ph/cm2/s
Error 6.37e-02 4.81e-02 4.04e-02 1.41e-01 1.30e-01 1.74e-01 ph/cm2/s
Fluence Band 3.08e-07 6.41e-07 9.25e-07 1.71e-06 2.50e-06 3.62e-06 erg/cm2
Error 3.30e-08 3.23e-08 5.23e-08 6.98e-07 1.26e-07 7.01e-07 erg/cm2
Peak flux Band 4.79e+00 6.02e+00 5.50e+00 8.79e+00 1.93e+01 1.87e+00 ph/cm2/s
Error 1.26e+03 4.59e+01 4.56e+00 7.00e+01 7.25e+01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.474 0.077 - - 2.13e-03 8.67e-05 52.160 57
CPL 1.075 0.318 123.4 227.7 3.28e-03 1.09e-03 48.203 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.127 0.162 - - 1.20e-02 1.08e-03 47.557 57
CPL 0.981 0.465 394.7 5000.0 1.40e-02 7.68e-03 47.468 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: 100.224000 sec.
T50 in the 50-300 keV band: 22.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 126.368 -24.116 102.252
T90 99.300 -3.484 95.816
T50 24.848 1.628 26.476
Peak 1.000 -0.968 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
329.7035 -22.4969 0.0048 17.9 -9.3 2.5540 40.7 TRIG_00213823
------------------------------------------
Foreground time interval of the image:
-24.116 18.813 (delta_t = 42.929 [sec])
Background time interval of the image:
-239.592 -24.116 (delta_t = 215.476 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -24.116 sec. to 102.252 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47412 ( -7.693267E-02 7.694745E-02) )
Norm@50keV : 2.130732E-03 ( -8.671382E-05 8.665910E-05) )
------------------------------------------------------------
Chi-Squared = 52.16008 using 59 PHA bins.
Reduced chi-squared = 0.9150892 for 57 degrees of freedom
Null hypothesis probability = 0.657
Photon flux (15-150 keV) in 126.4 sec: 0.264191 ( -0.01148 0.011515 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56622e-06 ( -1.12888e-07 1.13077e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.116 sec. to 102.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07496 ( -0.283659 0.352345 )
Epeak [keV] : 123.354 ( -30.5860 424.856 )
Norm@50keV : 3.284711E-03 ( -1.020867E-03 1.150805E-03) )
------------------------------------------------------------
Chi-Squared = 48.20348 using 59 PHA bins.
Reduced chi-squared = 0.8607765 for 56 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 126.4 sec: 0.258375 ( -0.012411 0.012461 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50559e-06 ( -1.26033e-07 1.24694e-07 ) ergs/cm2
Band function
Time interval is from -24.116 sec. to 102.252 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.930861 ( -9.06914 2.72985 )
beta : -1.61092 ( -7.11338 1.40319 )
Epeak [keV] : 85.5985 ( -86.5674 392.582 )
Norm@50keV : 4.171229E-03 ( -9.107119E-04 1.238250E-03) )
------------------------------------------------------------
Chi-Squared = 49.56782 using 59 PHA bins.
Reduced chi-squared = 0.9012331 for 55 degrees of freedom
Null hypothesis probability = 0.681
Photon flux (15-150 keV) in 126.4 sec: 0.258383 ( -0.012449 0.012464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50355e-06 ( -1.25882e-07 1.25237e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12736 ( -0.163604 0.160808 )
Norm@50keV : 1.200584E-02 ( -1.080412E-03 1.078700E-03) )
------------------------------------------------------------
Chi-Squared = 47.55680 using 59 PHA bins.
Reduced chi-squared = 0.8343298 for 57 degrees of freedom
Null hypothesis probability = 0.809
Photon flux (15-150 keV) in 1.000 sec: 1.39651 ( -0.12981 0.13015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24493e-07 ( -1.2333e-08 1.2306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.980963 ( -0.629400 0.300859 )
Epeak [keV] : 394.657 ( -394.647 9605.34 )
Norm@50keV : 1.400982E-02 ( -3.008313E-03 1.234734E-02) )
------------------------------------------------------------
Chi-Squared = 47.46844 using 59 PHA bins.
Reduced chi-squared = 0.8476506 for 56 degrees of freedom
Null hypothesis probability = 0.784
Photon flux (15-150 keV) in 1.000 sec: 1.39616 ( -0.12979 0.13011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23985e-07 ( -1.2786e-08 1.2425e-08 ) ergs/cm2
Band function
Time interval is from -0.968 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.901949 ( -9.09805 5.89401 )
beta : -1.12736 ( -8.36479 0.668621 )
Epeak [keV] : 57.4384 ( -439.729 9560.17 )
Norm@50keV : 2.083148E-02 ( -2.720613E-03 380071. )
------------------------------------------------------------
Chi-Squared = 47.55680 using 59 PHA bins.
Reduced chi-squared = 0.8646691 for 55 degrees of freedom
Null hypothesis probability = 0.752
Photon flux (15-150 keV) in 1.000 sec: 19.2868 ( -19.2868 125.717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23902e-07 ( -1.2773e-08 1.2643e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 16:31:58 EST 2008