batgrbproduct Analysis for Trigger=282003
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 17 17:09:33 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger282003/SDC
======================================================================
Trigger: 00282003 Segment: 000
BAT Trigger Time: 203219835.904 [s; MET]
Trigger Stop: 203219840 [s; MET]
UTC: 2007-06-11T01:57:13.890180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 1.9868655908934 Dec: -29.7554040882877 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 9.07
Flight Position: [ source = BAT ]
RA: 1.9868655908934 Dec: -29.7554040882877 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 2.00349527969329 Dec: -29.7582133916665 [deg; J2000]
{ 00h 08m 00.8s , -29d 45' 29.6" }
+/- 1.92333470075207 [arcmin] (estimated 90% radius based on SNR)
+/- 0.793933293019857 [arcmin] (formal 1-sigma fit error)
SNR: 11.9488390857783
RA = 0h 8m 0.8s (2.003495 deg.)
Dec = -29d 45' 30" (-29.758213 deg.)
Angular difference between Flight and Ground position is 0.882461 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 12.1599999964237 +/- 2.52130758387292
Measured from: -5.53600001335144
to: 6.62399998307228 [s; relative to TRIGTIME]
T50: 5.44000002741814 +/- 2.12745858935926
Measured from: -1.76000002026558
to: 3.68000000715256 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.76399999856949
to: 3.76399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.30400002002716
to: 7.32799997925758 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.160304 0.268475 0.131048 0.065540
0.027409 0.027794 0.025088 0.022247 [error]
Peak 0.016828 0.049439 0.012135 0.005894
0.007537 0.007649 0.006632 0.005882 [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 6.25e-08 1.04e-07 1.32e-07 3.32e-07 3.91e-07 6.30e-07 erg/cm2
Error 1.33e-08 1.42e-08 2.37e-08 1.24e-07 5.73e-08 1.44e-07 erg/cm2
Peak flux Power-law 3.30e-01 2.75e-01 1.56e-01 1.31e-01 8.19e-01 8.92e-01 ph/cm2/s
Error 1.22e-01 7.05e-02 5.36e-02 8.56e-02 2.11e-01 2.26e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.88e-01 3.97e-01 1.57e-01 4.92e-03 7.47e-01 7.47e-01 ph/cm2/s
Error 7.64e-02 9.49e-02 6.37e-02 1.13e-02 1.75e-01 1.73e-01 ph/cm2/s
Fluence Band 5.04e-08 1.25e-07 1.27e-07 1.69e-07 3.64e-07 4.76e-07 erg/cm2
Error 1.98e-08 1.43e-08 2.46e-08 1.40e-07 6.01e-08 1.63e-07 erg/cm2
Peak flux Band 2.56e-01 3.54e-01 1.68e-01 3.23e-02 8.01e-01 8.01e-01 ph/cm2/s
Error 1.17e-01 8.55e-02 6.66e-02 5.77e-02 2.02e-01 2.19e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.661 0.224 - - 3.09e-03 4.29e-04 53.397 57
CPL 0.374 0.000 57.7 0.0 1.53e-02 0.00e+00 50.118 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.816 0.409 - - 5.90e-03 1.63e-03 71.983 57
CPL -1.819 0.000 46.2 8.9 5.23e-01 0.00e+00 64.124 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.632 -6.304 7.328
T90 12.160 -5.536 6.624
T50 5.440 -1.760 3.680
Peak 1.000 2.764 3.764
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.0035 -29.7582 0.0161 43.0 -167.3 0.6588 11.9 TRIG_00282003
------------------------------------------
Foreground time interval of the image:
-6.304 7.328 (delta_t = 13.632 [sec])
Background time interval of the image:
-239.904 -6.304 (delta_t = 233.600 [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 -6.304 sec. to 7.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66123 ( -0.221650 0.226262 )
Norm@50keV : 3.085166E-03 ( -4.313849E-04 4.264880E-04) )
------------------------------------------------------------
Chi-Squared = 53.39660 using 59 PHA bins.
Reduced chi-squared = 0.9367824 for 57 degrees of freedom
Null hypothesis probability = 0.611
Photon flux (15-150 keV) in 13.63 sec: 0.404353 ( -0.055044 0.055175 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90655e-07 ( -5.69884e-08 5.76549e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.304 sec. to 7.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.373827 ( )
Epeak [keV] : 57.7064 ( )
Norm@50keV : 1.532099E-02 ( )
------------------------------------------------------------
Chi-Squared = 50.11845 using 59 PHA bins.
Reduced chi-squared = 0.8949723 for 56 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 13.63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -6.304 sec. to 7.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.702161E-02 ( -1.19213 4.01591 )
beta : -2.28028 ( -7.71972 0.561254 )
Epeak [keV] : 51.1386 ( -22.2153 32.3379 )
Norm@50keV : 2.388291E-02 ( -0.137710 8.50927 )
------------------------------------------------------------
Chi-Squared = 48.56728 using 59 PHA bins.
Reduced chi-squared = 0.8830414 for 55 degrees of freedom
Null hypothesis probability = 0.717
Photon flux (15-150 keV) in 13.63 sec: 0.384277 ( -0.057904 0.052302 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64192e-07 ( -6.2743e-08 5.74382e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.784 sec. to 3.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81609 ( -0.392281 0.424819 )
Norm@50keV : 5.904081E-03 ( -1.651565E-03 1.611380E-03) )
------------------------------------------------------------
Chi-Squared = 71.98347 using 59 PHA bins.
Reduced chi-squared = 1.262868 for 57 degrees of freedom
Null hypothesis probability = 8.730E-02
Photon flux (15-150 keV) in 0.9600 sec: 0.818641 ( -0.210144 0.210899 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.21151e-08 ( -1.43761e-08 1.47982e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.784 sec. to 3.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.81867 ( )
Epeak [keV] : 46.1936 ( -8.07863 9.63456 )
Norm@50keV : 0.523416 ( )
------------------------------------------------------------
Chi-Squared = 64.12374 using 59 PHA bins.
Reduced chi-squared = 1.145067 for 56 degrees of freedom
Null hypothesis probability = 0.213
Photon flux (15-150 keV) in 0.9600 sec: 0.746818 ( -0.174614 0.174833 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41087e-08 ( -1.06082e-08 1.10121e-08 ) ergs/cm2
Band function
Time interval is from 2.784 sec. to 3.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.46713 ( -3.25864 2.872944E-03) )
beta : -4.55118 ( -4.09798 2.94278 )
Epeak [keV] : 46.6066 ( -5.73326 5.82836 )
Norm@50keV : 0.371992 ( -14.7397 37.1592 )
------------------------------------------------------------
Chi-Squared = 63.97283 using 59 PHA bins.
Reduced chi-squared = 1.163142 for 55 degrees of freedom
Null hypothesis probability = 0.191
Photon flux (15-150 keV) in 0.9600 sec: 0.801394 ( -0.209335 0.194649 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24116e-08 ( -9.89443e-09 1.0165e-08 ) ergs/cm2
Plot creation:
Mon Dec 17 17:24:59 EST 2007