batgrbproduct Analysis for Trigger=151334
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 8 17:29:05 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger151334/GCN5_download_cron
======================================================================
Trigger: 00151334 Segment: 000
BAT Trigger Time: 146274626.88 [s; MET]
Trigger Stop: 146274627.904 [s; MET]
UTC: 2005-08-20T23:50:27.194600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.55688251993 Dec: -72.6677827863734 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.76
Image Trigger?: NO
Rate S/N Ratio: 14.2828568570857 [ if not an image trigger ]
Image S/N Ratio: 8.76
Flight Position: [ source = BAT ]
RA: 135.55688251993 Dec: -72.6677827863734 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.60847184794 Dec: -72.6414837190511 [deg; J2000]
{ 09h 02m 26.0s , -72d 38' 29.3" }
+/- 0.554058218672502 [arcmin] (estimated 90% radius based on SNR)
+/- 0.13802286982671 [arcmin] (formal 1-sigma fit error)
SNR: 70.7078784288175
RA = 9h 2m 26.0s (135.608472 deg.)
Dec = -72d 38' 29" (-72.641484 deg.)
Angular difference between Flight and Ground position is 1.827979 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 11.9920000135899 +/- 0.525463589834239
Measured from: 1.62000000476837
to: 13.6120000183582 [s; relative to TRIGTIME]
T50: 3.75599998235703 +/- 0.18426067208034
Measured from: 7.37600001692772
to: 11.1319999992847 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.58799999952316
to: 9.58799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0719999969005585
to: 15.0240000188351 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.693850 1.202158 1.021212 0.207099
0.021043 0.022430 0.020360 0.014967 [error]
Peak 0.089098 0.187612 0.189633 0.044878
0.006085 0.007102 0.007086 0.004712 [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 2.39e-07 4.85e-07 7.67e-07 2.69e-06 2.13e-06 4.11e-06 erg/cm2
Error 1.22e-08 1.45e-08 2.11e-08 1.72e-07 5.34e-08 0.00e+00 erg/cm2
Peak flux Power-law 9.31e-01 1.23e+00 1.20e+00 2.08e+00 4.05e+00 5.45e+00 ph/cm2/s
Error 8.02e-02 6.52e-02 5.46e-02 2.01e-01 1.77e-01 2.47e-01 ph/cm2/s
Fluence Cutoff-PL 1.96e-07 5.00e-07 8.25e-07 1.25e-06 2.06e-06 2.78e-06 erg/cm2
Error 1.60e-08 1.59e-08 2.66e-08 2.41e-07 5.80e-08 2.43e-07 erg/cm2
Peak flux Cutoff-PL 7.45e-01 1.28e+00 1.33e+00 1.08e+00 3.95e+00 4.44e+00 ph/cm2/s
Error 1.01e-01 7.34e-02 7.45e-02 2.59e-01 1.81e-01 3.13e-01 ph/cm2/s
Fluence Band 1.94e-07 4.98e-07 8.23e-07 1.25e-06 2.06e-06 2.78e-06 erg/cm2
Error 1.59e-08 1.59e-08 2.66e-08 2.41e-07 5.79e-08 2.43e-07 erg/cm2
Peak flux Band 7.45e-01 1.28e+00 1.33e+00 1.08e+00 3.95e+00 4.44e+00 ph/cm2/s
Error 1.01e-01 7.34e-02 7.45e-02 2.59e-01 1.82e-01 3.13e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.339 0.045 - - 1.44e-02 3.51e-04 89.622 57
CPL 0.609 0.211 111.0 17.0 2.98e-02 6.15e-03 48.718 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.041 0.072 - - 3.51e-02 1.50e-03 68.058 57
CPL 0.221 0.335 127.6 32.8 8.00e-02 2.67e-02 46.780 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: 11.648000 sec.
T50 in the 50-300 keV band: 3.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.096 -0.072 15.024
T90 11.992 1.620 13.612
T50 3.756 7.376 11.132
Peak 1.000 8.588 9.588
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.6085 -72.6415 0.0027 20.2 171.0 3.1748 70.7 TRIG_00151334
------------------------------------------
Foreground time interval of the image:
-0.072 15.024 (delta_t = 15.096 [sec])
Background time interval of the image:
-209.579 -0.072 (delta_t = 209.507 [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 -0.072 sec. to 15.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33882 ( -4.455626E-02 4.470563E-02) )
Norm@50keV : 1.442888E-02 ( -3.510583E-04 3.512008E-04) )
------------------------------------------------------------
Chi-Squared = 89.62161 using 59 PHA bins.
Reduced chi-squared = 1.572309 for 57 degrees of freedom
Null hypothesis probability = 3.762E-03
Photon flux (15-150 keV) in 15.10 sec: 1.73438 ( -0.04691 0.04707 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1334e-06 ( -5.3454e-08 5.32879e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 15.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.608980 ( -0.215656 0.206373 )
Epeak [keV] : 111.050 ( -12.8146 21.1541 )
Norm@50keV : 2.981918E-02 ( -5.401978E-03 6.894635E-03) )
------------------------------------------------------------
Chi-Squared = 48.71841 using 59 PHA bins.
Reduced chi-squared = 0.8699716 for 56 degrees of freedom
Null hypothesis probability = 0.744
Photon flux (15-150 keV) in 15.10 sec: 1.65242 ( -0.05084 0.0511 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06313e-06 ( -5.80142e-08 5.79538e-08 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 15.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.609604 ( -0.205683 0.216369 )
beta : -9.15971 ( -0.840292 4.87511 )
Epeak [keV] : 111.087 ( -12.8601 21.0966 )
Norm@50keV : 2.979896E-02 ( -5.381824E-03 6.918626E-03) )
------------------------------------------------------------
Chi-Squared = 48.71857 using 59 PHA bins.
Reduced chi-squared = 0.8857921 for 55 degrees of freedom
Null hypothesis probability = 0.712
Photon flux (15-150 keV) in 15.10 sec: 1.65248 ( -0.05091 0.05108 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06197e-06 ( -5.80293e-08 5.77877e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.588 sec. to 9.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04051 ( -7.198864E-02 7.139909E-02) )
Norm@50keV : 3.509141E-02 ( -1.498003E-03 1.496367E-03) )
------------------------------------------------------------
Chi-Squared = 68.05848 using 59 PHA bins.
Reduced chi-squared = 1.194008 for 57 degrees of freedom
Null hypothesis probability = 0.150
Photon flux (15-150 keV) in 1.000 sec: 4.05021 ( -0.17741 0.17744 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74137e-07 ( -1.6945e-08 1.7018e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.588 sec. to 9.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.221331 ( -0.348114 0.321161 )
Epeak [keV] : 127.637 ( -21.5929 43.9404 )
Norm@50keV : 8.001432E-02 ( -2.150587E-02 3.194969E-02) )
------------------------------------------------------------
Chi-Squared = 46.77976 using 59 PHA bins.
Reduced chi-squared = 0.8353529 for 56 degrees of freedom
Null hypothesis probability = 0.805
Photon flux (15-150 keV) in 1.000 sec: 3.94647 ( -0.18122 0.18169 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65837e-07 ( -1.8042e-08 1.7869e-08 ) ergs/cm2
Band function
Time interval is from 8.588 sec. to 9.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.221173 ( -0.321292 0.348062 )
beta : -8.22992 ( -1.77008 6.07342 )
Epeak [keV] : 127.603 ( -21.5623 43.9496 )
Norm@50keV : 8.003162E-02 ( -2.152278E-02 3.195526E-02) )
------------------------------------------------------------
Chi-Squared = 46.77990 using 59 PHA bins.
Reduced chi-squared = 0.8505436 for 55 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 1.000 sec: 3.94665 ( -0.18159 0.18152 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65652e-07 ( -1.8037e-08 1.7861e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 17:40:31 EST 2008