batgrbproduct Analysis for Trigger=285654
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): Fri Dec 14 05:04:45 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger285654/SDC
======================================================================
Trigger: 00285654 Segment: 000
BAT Trigger Time: 206706828.416 [s; MET]
Trigger Stop: 206706830.464 [s; MET]
UTC: 2007-07-21T10:33:46.314280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.1314958399504 Dec: -2.18419461651638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.36
Image Trigger?: NO
Rate S/N Ratio: 12 [ if not an image trigger ]
Image S/N Ratio: 8.36
Flight Position: [ source = BAT ]
RA: 33.1314958399504 Dec: -2.18419461651638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.1336918326739 Dec: -2.20289700162243 [deg; J2000]
{ 02h 12m 32.1s , -02d 12' 10.4" }
+/- 1.16522555758432 [arcmin] (estimated 90% radius based on SNR)
+/- 0.430030483178246 [arcmin] (formal 1-sigma fit error)
SNR: 24.448203338541
RA = 2h 12m 32.1s (33.133692 deg.)
Dec = -2d 12' 10" (-2.202897 deg.)
Angular difference between Flight and Ground position is 1.129841 arcmin
Partial Coding Fraction: 0.2382812 [ including projection effects ]
Duration
T90: 338.768000006676 +/- 21.3202068350191
Measured from: -4.12000000476837
to: 334.648000001907 [s; relative to TRIGTIME]
T50: 251.095999985933 +/- 35.3446204691458
Measured from: 2.63199999928474
to: 253.727999985218 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.188000023365021
to: 0.811999976634979 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.71200001239777
to: 359.919999986887 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.242473 1.699097 1.664752 0.507345
0.099411 0.101609 0.091339 0.078140 [error]
Peak 0.024441 0.066902 0.073893 0.032164
0.009789 0.010567 0.010211 0.008342 [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 3.97e-07 8.08e-07 1.28e-06 4.51e-06 3.56e-06 7.01e-06 erg/cm2
Error 4.83e-08 5.75e-08 8.92e-08 7.24e-07 2.24e-07 7.67e-07 erg/cm2
Peak flux Power-law 3.40e-01 4.63e-01 4.64e-01 8.43e-01 1.54e+00 2.11e+00 ph/cm2/s
Error 1.20e-01 1.01e-01 7.67e-02 3.01e-01 2.66e-01 3.54e-01 ph/cm2/s
Fluence Cutoff-PL 3.85e-07 8.16e-07 1.30e-06 3.92e-06 3.55e-06 6.32e-06 erg/cm2
Error 4.45e-08 6.28e-08 1.05e-07 1.46e-06 2.29e-07 1.47e-06 erg/cm2
Peak flux Cutoff-PL 3.01e-01 4.76e-01 4.95e-01 5.50e-01 1.52e+00 1.82e+00 ph/cm2/s
Error 1.46e-01 1.12e-01 1.04e-01 4.63e-01 2.68e-01 5.27e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.73e-01 5.00e-01 4.81e-01 7.07e-01 1.50e+00 1.93e+00 ph/cm2/s
Error 1.67e-01 1.29e-01 1.01e-01 5.51e-01 2.78e-01 4.61e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.335 0.109 - - 9.91e-04 5.91e-05 50.396 57
CPL 1.215 0.330 370.8 4933.2 1.12e-03 4.07e-04 50.204 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.996 0.283 - - 1.34e-02 2.25e-03 39.310 57
CPL 0.527 1.073 184.4 5000.0 2.15e-02 5.00e+23 38.806 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: 354.240000 sec.
T50 in the 50-300 keV band: 281.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 366.632 -6.712 359.920
T90 338.768 -4.120 334.648
T50 251.096 2.632 253.728
Peak 1.000 -0.188 0.812
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.1337 -2.2029 0.0078 38.9 -120.2 3.0649 24.4 TRIG_00285654
------------------------------------------
Foreground time interval of the image:
-6.712 27.989 (delta_t = 34.701 [sec])
Background time interval of the image:
-239.416 -6.712 (delta_t = 232.704 [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 -6.712 sec. to 359.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33480 ( -0.109570 0.108582 )
Norm@50keV : 9.911356E-04 ( -5.907682E-05 5.903421E-05) )
------------------------------------------------------------
Chi-Squared = 50.39569 using 59 PHA bins.
Reduced chi-squared = 0.8841349 for 57 degrees of freedom
Null hypothesis probability = 0.719
Photon flux (15-150 keV) in 366.6 sec: 0.119036 ( -0.007708 0.007749 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56089e-06 ( -2.23476e-07 2.2455e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.712 sec. to 359.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21488 ( -0.438384 0.221528 )
Epeak [keV] : 370.841 ( -237.248 9629.16 )
Norm@50keV : 1.123745E-03 ( -1.859623E-04 6.277091E-04) )
------------------------------------------------------------
Chi-Squared = 50.20420 using 59 PHA bins.
Reduced chi-squared = 0.8965035 for 56 degrees of freedom
Null hypothesis probability = 0.693
Photon flux (15-150 keV) in 366.6 sec: 0.118392 ( -0.008054 0.007393 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54731e-06 ( -2.29591e-07 2.2867e-07 ) ergs/cm2
Band function
Time interval is from -6.712 sec. to 359.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.969013 ( -9.91099 2.82093 )
beta : -1.33796 ( -0.127630 0.111313 )
Epeak [keV] : 68.5355 ( -285.461 9714.44 )
Norm@50keV : 1.867945E-03 ( -3.079565E-04 160.761 )
------------------------------------------------------------
Chi-Squared = 50.36391 using 59 PHA bins.
Reduced chi-squared = 0.9157075 for 55 degrees of freedom
Null hypothesis probability = 0.652
Photon flux (15-150 keV) in 366.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.995708 ( -0.293357 0.272814 )
Norm@50keV : 1.337077E-02 ( -2.269838E-03 2.231638E-03) )
------------------------------------------------------------
Chi-Squared = 39.31036 using 59 PHA bins.
Reduced chi-squared = 0.6896554 for 57 degrees of freedom
Null hypothesis probability = 0.964
Photon flux (15-150 keV) in 1.000 sec: 1.53913 ( -0.265 0.26667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44688e-07 ( -2.3016e-08 1.192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.527122 ( -1.43405 0.710982 )
Epeak [keV] : 184.399 ( -184.389 9815.60 )
Norm@50keV : 2.154947E-02 ( -2.154947E-02 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 38.80632 using 59 PHA bins.
Reduced chi-squared = 0.6929701 for 56 degrees of freedom
Null hypothesis probability = 0.961
Photon flux (15-150 keV) in 1.000 sec: 1.52067 ( -0.26584 0.27003 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43281e-07 ( -2.55e-08 2.4581e-08 ) ergs/cm2
Band function
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.081355E-02 ( -10.0508 4.86657 )
beta : -1.29086 ( -8.70914 0.525939 )
Epeak [keV] : 96.3321 ( -46.2321 690.203 )
Norm@50keV : 4.411369E-02 ( -1.04388 56.5873 )
------------------------------------------------------------
Chi-Squared = 38.32380 using 59 PHA bins.
Reduced chi-squared = 0.6967964 for 55 degrees of freedom
Null hypothesis probability = 0.957
Photon flux (15-150 keV) in 1.000 sec: 1.50408 ( -0.2781 0.27846 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43066e-07 ( -2.5345e-08 2.4685e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 05:18:39 EST 2007