batgrbproduct Analysis for Trigger=241963
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): Wed Jan 2 14:59:22 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger241963/GCN5_download_cron
======================================================================
Trigger: 00241963 Segment: 000
BAT Trigger Time: 186739906.304 [s; MET]
Trigger Stop: 186739910.4 [s; MET]
UTC: 2006-12-02T08:11:44.696300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 105.641791830877 Dec: -74.6649388439387 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.94
Image Trigger?: NO
Rate S/N Ratio: 9.74679434480896 [ if not an image trigger ]
Image S/N Ratio: 6.94
Flight Position: [ source = BAT ]
RA: 105.641791830877 Dec: -74.6649388439387 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 105.247075208009 Dec: -74.6015971835612 [deg; J2000]
{ 07h 00m 59.3s , -74d 36' 05.7" }
+/- 4.44656273444565 [arcmin] (estimated 90% radius based on SNR)
+/- 3.16053774121808 [arcmin] (formal 1-sigma fit error)
SNR: 3.60885308877955
RA = 7h 0m 59.3s (105.247075 deg.)
Dec = -74d 36' 6" (-74.601597 deg.)
Angular difference between Flight and Ground position is 7.336926 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 91.2280000150204 +/- 36.2314643358444
Measured from: 40.1319999992847
to: 131.360000014305 [s; relative to TRIGTIME]
T50: 17.2919999957085 +/- 1.76800452935008
Measured from: 76.6840000152588
to: 93.9760000109673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 75.0400000214577
to: 76.0400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.835999995470047
to: 147.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.722355 2.128831 1.521261 0.338584
0.062295 0.062440 0.054594 0.046652 [error]
Peak 0.077709 0.114178 0.089819 0.024782
0.006163 0.006528 0.005908 0.004331 [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 5.38e-07 9.15e-07 1.18e-06 3.09e-06 3.49e-06 5.72e-06 erg/cm2
Error 3.91e-08 3.74e-08 5.62e-08 3.38e-07 1.34e-07 3.69e-07 erg/cm2
Peak flux Power-law 7.81e-01 8.37e-01 6.36e-01 7.88e-01 2.55e+00 3.04e+00 ph/cm2/s
Error 9.56e-02 6.09e-02 4.81e-02 1.28e-01 1.69e-01 1.93e-01 ph/cm2/s
Fluence Cutoff-PL 5.17e-07 9.27e-07 1.20e-06 2.33e-06 3.44e-06 4.86e-06 erg/cm2
Error 5.06e-08 4.10e-08 6.22e-08 8.44e-07 1.11e-07 8.51e-07 erg/cm2
Peak flux Cutoff-PL 7.67e-01 8.42e-01 6.42e-01 7.19e-01 2.54e+00 2.97e+00 ph/cm2/s
Error 1.14e-01 6.56e-02 4.65e-02 2.33e-01 1.31e-01 2.95e-01 ph/cm2/s
Fluence Band 5.36e-07 9.13e-07 1.18e-06 3.08e-06 3.48e-06 5.71e-06 erg/cm2
Error 1.99e-08 3.30e-08 5.01e-08 2.32e-07 1.27e-07 2.07e-07 erg/cm2
Peak flux Band 7.53e-01 8.48e-01 6.42e-01 7.41e-01 2.53e+00 2.99e+00 ph/cm2/s
Error 1.06e-01 7.24e-02 5.46e-02 1.17e-01 1.80e-01 2.56e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.628 0.072 - - 2.52e-03 9.20e-05 73.936 57
CPL 1.390 0.275 137.8 4954.2 3.25e-03 9.20e-04 72.321 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.395 0.115 - - 2.10e-02 1.32e-03 49.987 57
CPL 1.293 0.333 355.6 5000.0 2.34e-02 9.01e-03 49.921 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: 54.848000 sec.
T50 in the 50-300 keV band: 16.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 148.280 -0.836 147.444
T90 91.228 40.132 131.360
T50 17.292 76.684 93.976
Peak 1.000 75.040 76.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.2471 -74.6016 0.0535 28.2 166.2 0.2676 3.6 TRIG_00241963
------------------------------------------
Foreground time interval of the image:
-0.836 52.497 (delta_t = 53.333 [sec])
Background time interval of the image:
-239.304 -0.836 (delta_t = 238.468 [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 -0.836 sec. to 147.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62839 ( -7.190931E-02 7.219291E-02) )
Norm@50keV : 2.521969E-03 ( -9.201583E-05 9.191409E-05) )
------------------------------------------------------------
Chi-Squared = 73.93595 using 59 PHA bins.
Reduced chi-squared = 1.297122 for 57 degrees of freedom
Null hypothesis probability = 6.516E-02
Photon flux (15-150 keV) in 148.3 sec: 0.326999 ( -0.013224 0.013291 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48636e-06 ( -1.33233e-07 1.33796e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.836 sec. to 147.444 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38963 ( -0.268805 0.280911 )
Epeak [keV] : 137.829 ( -46.2200 9862.17 )
Norm@50keV : 3.253277E-03 ( -7.851315E-04 1.055033E-03) )
------------------------------------------------------------
Chi-Squared = 72.32120 using 59 PHA bins.
but latest trial 1.66499 gives Chi-Squared = 2.35522
Reduced chi-squared = 1.291450 for 56 degrees of freedom
Null hypothesis probability = 7.007E-02
Photon flux (15-150 keV) in 148.3 sec: 0.321645 ( -0.014861 0.014882 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43713e-06 ( -7.52771e-08 1.46283e-07 ) ergs/cm2
Band function
Time interval is from -0.836 sec. to 147.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23219 ( -8.76781 1.76616 )
beta : -1.68049 ( -7.80900 0.607906 )
Epeak [keV] : 75.7661 ( -158.024 9841.88 )
Norm@50keV : 4.237157E-03 ( -6.329431E-04 8.245706E-03) )
------------------------------------------------------------
Chi-Squared = 73.79331 using 59 PHA bins.
Reduced chi-squared = 1.341697 for 55 degrees of freedom
Null hypothesis probability = 4.621E-02
Photon flux (15-150 keV) in 148.3 sec: 0.321628 ( -0.014856 0.014911 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4825e-06 ( -1.28977e-07 1.25892e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 75.040 sec. to 76.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39503 ( -0.114873 0.114975 )
Norm@50keV : 2.098358E-02 ( -1.318824E-03 1.317976E-03) )
------------------------------------------------------------
Chi-Squared = 49.98688 using 59 PHA bins.
Reduced chi-squared = 0.8769628 for 57 degrees of freedom
Null hypothesis probability = 0.733
Photon flux (15-150 keV) in 1.000 sec: 2.55254 ( -0.16878 0.16936 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02966e-07 ( -1.3911e-08 1.3961e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 75.040 sec. to 76.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29251 ( -0.451596 0.213614 )
Epeak [keV] : 355.648 ( -355.638 9644.35 )
Norm@50keV : 2.344647E-02 ( -3.695998E-03 1.432800E-02) )
------------------------------------------------------------
Chi-Squared = 49.92100 using 59 PHA bins.
Reduced chi-squared = 0.8914464 for 56 degrees of freedom
Null hypothesis probability = 0.703
Photon flux (15-150 keV) in 1.000 sec: 2.54247 ( -0.08762 0.17524 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02308e-07 ( -7.427e-09 1.44e-08 ) ergs/cm2
Band function
Time interval is from 75.040 sec. to 76.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18736 ( -8.81264 0.917774 )
beta : -1.49465 ( -8.50535 0.209630 )
Epeak [keV] : 194.379 ( -194.279 9760.19 )
Norm@50keV : 2.665115E-02 ( -7.050743E-03 99.1288 )
------------------------------------------------------------
Chi-Squared = 49.76362 using 59 PHA bins.
Reduced chi-squared = 0.9047931 for 55 degrees of freedom
Null hypothesis probability = 0.674
Photon flux (15-150 keV) in 1.000 sec: 2.53384 ( -0.17978 0.18018 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01966e-07 ( -1.4616e-08 1.4664e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 15:23:45 EST 2008