batgrbproduct Analysis for Trigger=259803
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): Thu Dec 13 13:01:30 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger259803/GCN5_download_cron
======================================================================
Trigger: 00259803 Segment: 000
BAT Trigger Time: 192684823.616 [s; MET]
Trigger Stop: 192684824.064 [s; MET]
UTC: 2007-02-09T03:33:41.863620 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 46.2373180663858 Dec: -47.3701637771961 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.09
Image Trigger?: NO
Rate S/N Ratio: 18.7082869338697 [ if not an image trigger ]
Image S/N Ratio: 9.09
Flight Position: [ source = BAT ]
RA: 46.2373180663858 Dec: -47.3701637771961 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 46.2337254510736 Dec: -47.3922691325228 [deg; J2000]
{ 03h 04m 56.1s , -47d 23' 32.2" }
+/- 2.23798861234109 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24617714332158 [arcmin] (formal 1-sigma fit error)
SNR: 9.62324226912138
RA = 3h 4m 56.1s (46.233725 deg.)
Dec = -47d 23' 32" (-47.392269 deg.)
Angular difference between Flight and Ground position is 1.334328 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 0.0680000185966492 +/- 0.0178885400881622
Measured from: 0.0879999995231628
to: 0.156000018119812 [s; relative to TRIGTIME]
T50: 0.0360000133514404 +/- 0.0144222095322683
Measured from: 0.0999999940395355
to: 0.136000007390976 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.372000008821487
to: 0.627999991178513 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0839999914169312
to: 0.168000012636185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004557 0.015968 0.012885 0.003009
0.001918 0.002164 0.002130 0.001647 [error]
Peak 0.004143 0.015905 0.013125 0.002443
0.001972 0.002186 0.002151 0.001672 [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 2.10e-09 4.81e-09 8.70e-09 3.71e-08 2.37e-08 4.84e-08 erg/cm2
Error 6.81e-10 9.64e-10 1.78e-09 1.65e-08 4.58e-09 0.00e+00 erg/cm2
Peak flux Power-law 7.65e-01 9.52e-01 8.61e-01 1.35e+00 3.04e+00 3.93e+00 ph/cm2/s
Error 2.53e-01 1.99e-01 1.74e-01 5.57e-01 5.60e-01 7.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.81e-09 5.41e-09 9.39e-09 1.07e-08 2.22e-08 2.70e-08 erg/cm2
Error 7.91e-10 1.33e-09 2.16e-09 2.44e-08 5.33e-09 2.25e-08 erg/cm2
Peak flux Cutoff-PL 5.95e-01 1.09e+00 9.75e-01 3.90e-01 2.94e+00 3.05e+00 ph/cm2/s
Error 2.97e-01 2.67e-01 2.25e-01 6.82e-01 5.77e-01 6.19e-01 ph/cm2/s
Fluence Band 1.79e-09 5.39e-09 9.39e-09 1.05e-08 2.22e-08 2.62e-08 erg/cm2
Error 7.79e-10 1.41e-09 2.14e-09 2.29e-08 5.32e-09 0.00e+00 erg/cm2
Peak flux Band 4.94e-01 1.18e+00 9.01e-01 8.22e-01 2.93e+00 3.39e+00 ph/cm2/s
Error 3.01e-01 2.48e-01 2.03e-01 7.51e-01 5.31e-01 8.50e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.152 0.290 - - 2.74e-02 4.81e-03 74.216 57
CPL 0.172 1.576 95.2 4968.3 8.50e-02 4.21e-01 72.725 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.144 0.291 - - 2.61e-02 4.70e-03 68.958 57
CPL -0.265 1.844 81.9 4971.6 1.32e-01 8.55e-01 66.331 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 0.084 0.084 0.168
T90 0.068 0.088 0.156
T50 0.036 0.100 0.136
Peak 1.000 -0.372 0.628
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
46.2337 -47.3923 0.0199 26.7 -1.5 0.0372 9.6 TRIG_00259803
------------------------------------------
Foreground time interval of the image:
0.020 0.104 (delta_t = 0.084 [sec])
Background time interval of the image:
-239.680 0.020 (delta_t = 239.700 [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 0.020 sec. to 0.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15214 ( -0.294135 0.286289 )
Norm@50keV : 2.738406E-02 ( -4.815785E-03 4.814224E-03) )
------------------------------------------------------------
Chi-Squared = 74.21561 using 59 PHA bins.
Reduced chi-squared = 1.302028 for 57 degrees of freedom
Null hypothesis probability = 6.241E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 3.19430 ( -0.57394 0.57529 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36654e-08 ( -4.55633e-09 4.60412e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 0.104 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.171895 ( -1.98345 1.16861 )
Epeak [keV] : 95.1915 ( -31.8426 9904.81 )
Norm@50keV : 8.503945E-02 ( -6.982759E-02 0.771275 )
------------------------------------------------------------
Chi-Squared = 72.72462 using 59 PHA bins.
but latest trial 45.9741 gives Chi-Squared = 9.53002
but latest trial 1.961253E-02 gives Chi-Squared = 8.71835
Reduced chi-squared = 1.298654 for 56 degrees of freedom
Null hypothesis probability = 6.586E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 3.12080 ( -0.59164 0.58785 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22123e-08 ( -5.48402e-09 5.18095e-09 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 0.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.61721 ( -6.80579 2.14279 )
beta : -1.63517 ( -0.858442 0.626061 )
Epeak [keV] : 52.1744 ( -23.5232 105.823 )
Norm@50keV : 1.05228 ( -5.04336 73.7836 )
------------------------------------------------------------
Chi-Squared = 70.49572 using 59 PHA bins.
Reduced chi-squared = 1.281740 for 55 degrees of freedom
Null hypothesis probability = 7.779E-02
Photon flux (15-150 keV) in 8.4000E-02 sec: 3.06084 ( -0.55756 0.55788 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21682e-08 ( -5.43169e-09 5.20834e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.020 sec. to 0.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14449 ( -0.294832 0.287180 )
Norm@50keV : 2.611207E-02 ( -4.698182E-03 4.695516E-03) )
------------------------------------------------------------
Chi-Squared = 68.95843 using 59 PHA bins.
Reduced chi-squared = 1.209797 for 57 degrees of freedom
Null hypothesis probability = 0.133
Photon flux (15-150 keV) in 8.8000E-02 sec: 3.04330 ( -0.55917 0.56051 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3694e-08 ( -4.63918e-09 4.68767e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 0.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.265344 ( -2.22857 1.45892 )
Epeak [keV] : 81.8528 ( -25.0804 9918.15 )
Norm@50keV : 0.132204 ( -0.132204 1.57735 )
------------------------------------------------------------
Chi-Squared = 66.33073 using 59 PHA bins.
Reduced chi-squared = 1.184477 for 56 degrees of freedom
Null hypothesis probability = 0.163
Photon flux (15-150 keV) in 8.8000E-02 sec: 2.94358 ( -0.57794 0.57536 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17745e-08 ( -5.48055e-09 5.313e-09 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 0.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.81121 ( -3.50659 1.65879 )
beta : -1.72469 ( -0.987940 0.679672 )
Epeak [keV] : 53.5378 ( -20.7799 47.5616 )
Norm@50keV : 1.17373 ( -7.93985 51.8429 )
------------------------------------------------------------
Chi-Squared = 64.47545 using 59 PHA bins.
Reduced chi-squared = 1.172281 for 55 degrees of freedom
Null hypothesis probability = 0.179
Photon flux (15-150 keV) in 8.8000E-02 sec: 2.93334 ( -0.52768 0.5346 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22622e-08 ( -4.67887e-09 4.86376e-09 ) ergs/cm2
Plot creation:
Thu Dec 13 13:16:35 EST 2007