batgrbproduct Analysis for Trigger=215180
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 17:55:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger215180/GCN5_download_cron
======================================================================
Trigger: 00215180 Segment: 000
BAT Trigger Time: 172304072 [s; MET]
Trigger Stop: 172304136 [s; MET]
UTC: 2006-06-18T06:14:30.737040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.291310749728 Dec: -15.3983662246485 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.43
Flight Position: [ source = BAT ]
RA: 244.291310749728 Dec: -15.3983662246485 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.294668886632 Dec: -15.3823930557243 [deg; J2000]
{ 16h 17m 10.7s , -15d 22' 56.6" }
+/- 1.03457445141401 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264211704409018 [arcmin] (formal 1-sigma fit error)
SNR: 28.9754484726955
RA = 16h 17m 10.7s (244.294669 deg.)
Dec = -15d 22' 57" (-15.382393 deg.)
Angular difference between Flight and Ground position is 0.977880 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 595.319999992847 +/- 19.7085260819116
Measured from: -38.027999997139
to: 557.291999995708 [s; relative to TRIGTIME]
T50: 296.272000014782 +/- 16.3193691119811
Measured from: 73.027999997139
to: 369.300000011921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -50.6599999964237
to: -49.6599999964237 [s; relative to TRIGTIME]
Total Fluence
Measured from: -63.8039999902248
to: 614.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 26.246312 2.316865 0.179797 0.090067
0.163740 0.145757 0.127425 0.114699 [error]
Peak 0.057559 0.011457 -0.001520 0.008832
0.009321 0.008311 0.007360 0.006574 [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 8.98e-06 9.68e-07 4.33e-08 2.02e-09 9.99e-06 9.99e-06 erg/cm2
Error 8.25e-07 8.80e-08 1.11e-08 9.09e-10 8.13e-07 8.12e-07 erg/cm2
Peak flux Power-law 5.36e-01 1.39e-01 1.90e-02 2.92e-03 6.96e-01 6.97e-01 ph/cm2/s
Error 1.57e-01 8.13e-02 2.70e-02 8.42e-03 2.10e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 8.82e-06 8.29e-07 2.88e-09 6.23e-14 9.62e-06 9.99e-06 erg/cm2
Error 9.23e-07 1.10e-07 6.69e-09 1.09e-11 9.23e-07 8.11e-07 erg/cm2
Peak flux Cutoff-PL 5.51e-01 1.36e-01 5.14e-03 1.63e-05 6.92e-01 6.93e-01 ph/cm2/s
Error 1.69e-01 9.18e-02 2.55e-02 7.58e-03 2.04e-01 2.04e-01 ph/cm2/s
Fluence Band 8.92e-06 8.46e-07 2.00e-08 5.13e-10 9.66e-06 9.73e-06 erg/cm2
Error 9.85e-07 8.14e-08 5.30e-09 3.69e-11 7.38e-07 6.68e-07 erg/cm2
Peak flux Band 5.32e-01 1.47e-01 2.20e-02 3.72e-03 7.03e-01 7.24e-01 ph/cm2/s
Error 1.52e-01 4.10e-02 8.56e-03 8.02e-03 2.04e-01 2.24e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.523 0.260 - - 7.25e-05 1.57e-05 91.422 57
CPL 1.334 0.000 2.9 4.3 9.46e-01 4.62e+01 82.457 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.871 1.145 - - 1.26e-03 1.44e-03 55.125 57
CPL 1.682 2.044 3.5 19.9 6.34e-02 9.47e+01 54.779 0
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 677.956 -63.804 614.152
T90 595.320 -38.028 557.292
T50 296.272 73.028 369.300
Peak 1.000 -50.660 -49.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.2947 -15.3824 0.0066 24.4 -172.6 3.1361 29.0 TRIG_00215180
------------------------------------------
Foreground time interval of the image:
-2.899 73.201 (delta_t = 76.100 [sec])
Background time interval of the image:
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 -63.804 sec. to 614.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.52309 ( -0.304695 0.215072 )
Norm@50keV : 7.247215E-05 ( -1.191298E-05 1.946709E-05) )
------------------------------------------------------------
Chi-Squared = 91.42242 using 59 PHA bins.
Reduced chi-squared = 1.603902 for 57 degrees of freedom
Null hypothesis probability = 2.577E-03
Photon flux (15-150 keV) in 678.0 sec: 0.501558 ( -0.044189 0.044676 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.99474e-06 ( -8.0804e-07 8.1699e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -63.804 sec. to 614.152 sec.
Photon index: 1.33362 ( )
Epeak [keV] : 2.87869 ( -0.201718 8.32028 )
Norm@50keV : 0.945707 ( -0.146139 92.1967 )
------------------------------------------------------------
Chi-Squared = 82.45736 using 59 PHA bins.
but latest trial -0.571078 gives Chi-Squared = 654.453
but latest trial 0.661514 gives Chi-Squared = 1.619720E-02
but latest trial 0.240371 gives Chi-Squared = 2.96071
Reduced chi-squared = 1.472453 for 56 degrees of freedom
Null hypothesis probability = 1.225E-02
Photon flux (15-150 keV) in 678.0 sec: 0.481993 ( -0.05096 0.049965 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.62367e-06 ( -9.33877e-07 9.12452e-07 ) ergs/cm2
Band function
Time interval is from -63.804 sec. to 614.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.12052 ( -4.547286E-02 0.117629 )
beta : -6.48142 ( -1.94190 0.718838 )
Epeak [keV] : 168.268 ( -2.38858 2.39138 )
Norm@50keV : 1.017170E-02 ( -15.5735 72.7587 )
------------------------------------------------------------
Chi-Squared = 91.35043 using 59 PHA bins.
Reduced chi-squared = 1.660917 for 55 degrees of freedom
Null hypothesis probability = 1.505E-03
Photon flux (15-150 keV) in 678.0 sec: 0.480703 ( -0.046341 0.053987 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66184e-06 ( -8.94757e-07 5.803e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -50.660 sec. to -49.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.87100 ( -0.920554 1.36894 )
Norm@50keV : 1.262240E-03 ( -1.262240E-03 1.616473E-03) )
------------------------------------------------------------
Chi-Squared = 55.12512 using 59 PHA bins.
Reduced chi-squared = 0.9671074 for 57 degrees of freedom
Null hypothesis probability = 0.546
Photon flux (15-150 keV) in 1.000 sec: 0.696098 ( -0.208914 0.210816 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53625e-08 ( -9.1789e-09 1.0783e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -50.660 sec. to -49.660 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.68183 ( -2.36910 1.71828 )
Epeak [keV] : 3.48257 ( -3.47257 36.3129 )
Norm@50keV : 6.335102E-02 ( -6.335103E-02 189.301 )
------------------------------------------------------------
Chi-Squared = 54.77938 using 59 PHA bins.
but latest trial -0.687266 gives Chi-Squared = 16.8208
but latest trial 37.1363 gives Chi-Squared = 13.6803
Reduced chi-squared = 0.9782032 for 56 degrees of freedom
Null hypothesis probability = 0.521
Photon flux (15-150 keV) in 1.000 sec: 0.692408 ( -0.20189 0.205358 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53507e-08 ( -9.1694e-09 1.07901e-08 ) ergs/cm2
Band function
Time interval is from -50.660 sec. to -49.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62532 ( -1.05205 1.72545 )
beta : -4.01216 ( -1.36621 0.921124 )
Epeak [keV] : 9.31900 ( -9.21900 9990.68 )
Norm@50keV : 1.995429E-02 ( -0.132000 0.219952 )
------------------------------------------------------------
Chi-Squared = 58.79395 using 59 PHA bins.
Reduced chi-squared = 1.068981 for 55 degrees of freedom
Null hypothesis probability = 0.338
Photon flux (15-150 keV) in 1.000 sec: 0.702918 ( -0.200435 0.206571 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42046e-08 ( -8.432e-09 1.07794e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 18:19:01 EST 2008