batgrbproduct Analysis for Trigger=201487
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): Mon Dec 31 14:08:57 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger201487/GCN5_download_cron
======================================================================
Trigger: 00201487 Segment: 000
BAT Trigger Time: 163901527.296 [s; MET]
Trigger Stop: 163901527.744 [s; MET]
UTC: 2006-03-13T00:12:06.228480 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 66.6095900742749 Dec: -10.8722794349947 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 129.36769303037 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 66.6095900742749 Dec: -10.8722794349947 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 66.6282286367184 Dec: -10.8592575304276 [deg; J2000]
{ 04h 26m 30.8s , -10d 51' 33.3" }
+/- 0.740026426907029 [arcmin] (estimated 90% radius based on SNR)
+/- 0.258343249592807 [arcmin] (formal 1-sigma fit error)
SNR: 46.7636124693922
RA = 4h 26m 30.8s (66.628229 deg.)
Dec = -10d 51' 33" (-10.859258 deg.)
Angular difference between Flight and Ground position is 1.347826 arcmin
Partial Coding Fraction: 0.546875 [ including projection effects ]
Duration
T90: 0.743999987840652 +/- 0.0341760179670827
Measured from: 0.164000004529953
to: 0.907999992370605 [s; relative to TRIGTIME]
T50: 0.480000019073486 +/- 0.0268328301242448
Measured from: 0.343999981880188
to: 0.824000000953674 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0740000009536743
to: 1.07400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.131999999284744
to: 1.01199999451637 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.191929 0.413381 0.543735 0.281579
0.010778 0.014539 0.017093 0.015301 [error]
Peak 0.191676 0.413592 0.543994 0.282481
0.010795 0.014558 0.017095 0.015309 [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 5.62e-08 1.69e-07 4.15e-07 2.85e-06 1.13e-06 1.92e-06 erg/cm2
Error 4.83e-09 8.45e-09 1.59e-08 2.71e-07 4.47e-08 0.00e+00 erg/cm2
Peak flux Power-law 2.02e+00 3.27e+00 4.02e+00 9.74e+00 1.21e+01 1.91e+01 ph/cm2/s
Error 1.75e-01 1.70e-01 1.51e-01 8.50e-01 4.48e-01 8.70e-01 ph/cm2/s
Fluence Cutoff-PL 5.51e-08 1.70e-07 4.20e-07 2.64e-06 1.12e-06 1.05e-06 erg/cm2
Error 5.95e-09 6.67e-09 5.53e-07 4.37e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.01e+00 3.27e+00 4.02e+00 9.68e+00 1.21e+01 1.90e+01 ph/cm2/s
Error 1.75e-01 1.70e-01 1.51e-01 8.45e-01 4.48e-01 8.65e-01 ph/cm2/s
Fluence Band 5.43e-08 1.70e-07 4.15e-07 2.82e-06 1.12e-06 9.48e-07 erg/cm2
Error 6.97e-09 9.42e-09 1.56e-08 4.84e-07 4.49e-08 0.00e+00 erg/cm2
Peak flux Band 1.98e+00 3.28e+00 4.06e+00 9.16e+00 1.21e+01 1.85e+01 ph/cm2/s
Error 2.16e-01 1.73e-01 1.91e-01 1.64e+00 4.55e-01 1.65e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.704 0.069 - - 1.05e-01 4.06e-03 49.899 57
CPL 0.696 0.070 9988.8 5000.0 1.06e-01 4.08e-03 49.873 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.703 0.069 - - 1.04e-01 4.05e-03 50.624 57
CPL 0.695 0.070 9988.4 5000.0 1.05e-01 4.06e-03 50.598 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.880 0.132 1.012
T90 0.744 0.164 0.908
T50 0.480 0.344 0.824
Peak 1.000 0.074 1.074
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.6282 -10.8593 0.0041 31.5 151.2 1.5086 46.8 TRIG_00201487
------------------------------------------
Foreground time interval of the image:
0.068 0.948 (delta_t = 0.880 [sec])
Background time interval of the image:
-299.360 0.068 (delta_t = 299.428 [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 0.068 sec. to 0.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.704477 ( -6.958354E-02 6.856239E-02) )
Norm@50keV : 0.104959 ( -4.073374E-03 4.048884E-03) )
------------------------------------------------------------
Chi-Squared = 49.89864 using 59 PHA bins.
Reduced chi-squared = 0.8754147 for 57 degrees of freedom
Null hypothesis probability = 0.736
Photon flux (15-150 keV) in 0.8800 sec: 12.1280 ( -0.4494 0.4498 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12517e-06 ( -4.466e-08 4.47392e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 0.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.696189 ( -7.017118E-02 6.918222E-02) )
Epeak [keV] : 9988.77 ( -9988.76 11.2295 )
Norm@50keV : 0.105779 ( -4.089020E-03 4.066579E-03) )
------------------------------------------------------------
Chi-Squared = 49.87258 using 59 PHA bins.
Reduced chi-squared = 0.8905818 for 56 degrees of freedom
Null hypothesis probability = 0.705
Photon flux (15-150 keV) in 0.8800 sec: 12.1160 ( -0.4519 0.4542 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12452e-06 ( -4.36982e-08 4.36744e-08 ) ergs/cm2
Band function
Time interval is from 0.068 sec. to 0.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.771826 ( -9.22817 5.77183 )
beta : -0.704450 ( -6.858099E-02 6.957483E-02) )
Epeak [keV] : 13.2934 ( -13.1934 9986.71 )
Norm@50keV : 0.165238 ( -5.241458E-02 235148. )
------------------------------------------------------------
Chi-Squared = 49.89866 using 59 PHA bins.
Reduced chi-squared = 0.9072483 for 55 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 0.8800 sec: 12.1151 ( -0.454 0.4558 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12312e-06 ( -4.60038e-08 4.38055e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.068 sec. to 0.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.702966 ( -6.958288E-02 6.861109E-02) )
Norm@50keV : 0.104487 ( -4.058257E-03 4.034869E-03) )
------------------------------------------------------------
Chi-Squared = 50.62445 using 59 PHA bins.
Reduced chi-squared = 0.8881483 for 57 degrees of freedom
Null hypothesis probability = 0.712
Photon flux (15-150 keV) in 0.8840 sec: 12.0750 ( -0.4477 0.448 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12596e-06 ( -4.46827e-08 4.47569e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 0.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.694698 ( -7.020324E-02 6.919962E-02) )
Epeak [keV] : 9988.40 ( -9988.39 11.6006 )
Norm@50keV : 0.105305 ( -4.074499E-03 4.051849E-03) )
------------------------------------------------------------
Chi-Squared = 50.59833 using 59 PHA bins.
Reduced chi-squared = 0.9035416 for 56 degrees of freedom
Null hypothesis probability = 0.679
Photon flux (15-150 keV) in 0.8840 sec: 12.0728 ( -0.4475 0.4479 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12653e-06 ( -4.47242e-08 4.47994e-08 ) ergs/cm2
Band function
Time interval is from 0.068 sec. to 0.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.683285 ( -9.31672 5.68328 )
beta : -0.702969 ( -6.860816E-02 6.958628E-02) )
Epeak [keV] : 13.8924 ( -9999.90 2.929688E-03) )
Norm@50keV : 0.166438 ( -4.073806E-03 4.046828E-03) )
------------------------------------------------------------
Chi-Squared = 50.62445 using 59 PHA bins.
Reduced chi-squared = 0.9204445 for 55 degrees of freedom
Null hypothesis probability = 0.642
Photon flux (15-150 keV) in 0.8840 sec: 12.0566 ( -0.4485 0.4613 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12364e-06 ( -4.61696e-08 4.35821e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 14:21:35 EST 2007