batgrbproduct Analysis for Trigger=290624
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 11:24:32 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger290624/GCN5_download_cron
======================================================================
Trigger: 00290624 Segment: 000
BAT Trigger Time: 211183066.304 [s; MET]
Trigger Stop: 211183067.328 [s; MET]
UTC: 2007-09-11T05:57:44.087900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 25.7991691907814 Dec: -33.4728088428944 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.5
Image Trigger?: NO
Rate S/N Ratio: 17.4928556845359 [ if not an image trigger ]
Image S/N Ratio: 10.5
Flight Position: [ source = BAT ]
RA: 25.7991691907814 Dec: -33.4728088428944 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 25.8099812686414 Dec: -33.4791487468178 [deg; J2000]
{ 01h 43m 14.4s , -33d 28' 44.9" }
+/- 0.508168425467487 [arcmin] (estimated 90% radius based on SNR)
+/- 0.15286907199678 [arcmin] (formal 1-sigma fit error)
SNR: 80.0032099978069
RA = 1h 43m 14.4s (25.809981 deg.)
Dec = -33d 28' 45" (-33.479149 deg.)
Angular difference between Flight and Ground position is 0.661440 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 158.583999991417 +/- 6.06081844959174
Measured from: -28.1079999804497
to: 130.476000010967 [s; relative to TRIGTIME]
T50: 65.9239999949932 +/- 1.38297069939194
Measured from: 21.9640000164509
to: 87.8880000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 36.1280000209808
to: 37.1280000209808 [s; relative to TRIGTIME]
Total Fluence
Measured from: -64.311999976635
to: 158.800000011921 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.939369 7.980241 5.067826 0.953378
0.084941 0.087054 0.076846 0.065883 [error]
Peak 0.110973 0.181382 0.155117 0.040748
0.006244 0.007059 0.006808 0.004944 [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-06 3.37e-06 4.08e-06 9.67e-06 1.23e-05 1.92e-05 erg/cm2
Error 9.09e-08 8.00e-08 9.26e-08 5.42e-07 2.30e-07 5.62e-07 erg/cm2
Peak flux Power-law 1.11e+00 1.27e+00 1.04e+00 1.42e+00 3.94e+00 4.85e+00 ph/cm2/s
Error 9.74e-02 6.67e-02 5.52e-02 1.62e-01 1.84e-01 2.26e-01 ph/cm2/s
Fluence Cutoff-PL 2.00e-06 3.38e-06 4.13e-06 8.00e-06 1.22e-05 1.75e-05 erg/cm2
Error 1.30e-07 8.13e-08 1.07e-07 1.66e-06 2.66e-07 1.59e-06 erg/cm2
Peak flux Cutoff-PL 1.01e+00 1.31e+00 1.09e+00 9.47e-01 3.87e+00 4.36e+00 ph/cm2/s
Error 1.21e-01 7.44e-02 6.71e-02 3.00e-01 1.91e-01 3.57e-01 ph/cm2/s
Fluence Band 1.98e-06 3.37e-06 4.12e-06 8.01e-06 1.22e-05 1.77e-05 erg/cm2
Error 1.29e-07 8.12e-08 1.07e-07 1.55e-06 2.73e-07 1.59e-06 erg/cm2
Peak flux Band 1.01e+00 1.31e+00 1.09e+00 9.47e-01 3.87e+00 4.36e+00 ph/cm2/s
Error 1.21e-01 7.45e-02 6.71e-02 3.00e-01 1.91e-01 3.57e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.724 0.040 - - 5.99e-03 1.12e-04 49.816 57
CPL 1.564 0.165 157.3 3966.4 7.02e-03 1.14e-03 47.040 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.290 0.080 - - 3.31e-02 1.49e-03 51.184 57
CPL 0.883 0.328 150.0 165.3 5.14e-02 1.83e-02 46.179 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: 158.272000 sec.
T50 in the 50-300 keV band: 63.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 223.112 -64.312 158.800
T90 158.584 -28.108 130.476
T50 65.924 21.964 87.888
Peak 1.000 36.128 37.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
25.8100 -33.4791 0.0024 21.2 156.6 13.8845 80.0 TRIG_00290624
------------------------------------------
Foreground time interval of the image:
-64.312 -28.952 (delta_t = 35.360 [sec])
-28.304 73.797 (delta_t = 102.101 [sec])
Background time interval of the image:
-299.304 -121.034 (delta_t = 178.270 [sec])
-120.304 -64.312 (delta_t = 55.992 [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
Multiple GTIs in the spectrum
tstart tstop
-64.312000 -28.952000
-28.304000 158.800000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72430 ( -3.993869E-02 3.997898E-02) )
Norm@50keV : 5.991497E-03 ( -1.119650E-04 1.119520E-04) )
------------------------------------------------------------
Chi-Squared = 49.81606 using 59 PHA bins.
Reduced chi-squared = 0.8739659 for 57 degrees of freedom
Null hypothesis probability = 0.739
Photon flux (15-150 keV) in 222.5 sec: 0.802613 ( -0.019461 0.019618 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23197e-05 ( -2.29042e-07 2.31556e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-64.312000 -28.952000
-28.304000 158.800000
Parameters : value lower 90% higher 90%
Photon index: 1.56431 ( -0.172310 0.157804 )
Epeak [keV] : 157.350 ( -52.5117 7880.39 )
Norm@50keV : 7.015064E-03 ( -1.015175E-03 1.263811E-03) )
------------------------------------------------------------
Chi-Squared = 47.03970 using 59 PHA bins.
but latest trial 1.72358 gives Chi-Squared = 2.78006
but latest trial 5.999691E-03 gives Chi-Squared = 2.72640
Reduced chi-squared = 0.8399946 for 56 degrees of freedom
Null hypothesis probability = 0.797
Photon flux (15-150 keV) in 222.5 sec: 0.787499 ( -0.024082 0.024493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21782e-05 ( -2.74231e-07 2.57922e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-64.312000 -28.952000
-28.304000 158.800000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56300 ( -0.164159 0.171003 )
beta : -7.99667 ( -2.00333 6.27481 )
Epeak [keV] : 156.503 ( -51.6914 7789.48 )
Norm@50keV : 7.021805E-03 ( -8.134888E-04 1.255845E-03) )
------------------------------------------------------------
Chi-Squared = 47.03978 using 59 PHA bins.
Reduced chi-squared = 0.8552688 for 55 degrees of freedom
Null hypothesis probability = 0.769
Photon flux (15-150 keV) in 222.5 sec: 0.787527 ( -0.024157 0.024476 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21657e-05 ( -2.74498e-07 2.7234e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 36.128 sec. to 37.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28964 ( -8.047557E-02 8.036840E-02) )
Norm@50keV : 3.310292E-02 ( -1.486391E-03 1.486354E-03) )
------------------------------------------------------------
Chi-Squared = 51.18364 using 59 PHA bins.
Reduced chi-squared = 0.8979586 for 57 degrees of freedom
Null hypothesis probability = 0.692
Photon flux (15-150 keV) in 1.000 sec: 3.94183 ( -0.1839 0.18415 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27954e-07 ( -1.6287e-08 1.6342e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.128 sec. to 37.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.882708 ( -0.340475 0.314564 )
Epeak [keV] : 150.028 ( -44.9820 285.663 )
Norm@50keV : 5.136662E-02 ( -1.445074E-02 2.205019E-02) )
------------------------------------------------------------
Chi-Squared = 46.17896 using 59 PHA bins.
Reduced chi-squared = 0.8246242 for 56 degrees of freedom
Null hypothesis probability = 0.822
Photon flux (15-150 keV) in 1.000 sec: 3.87236 ( -0.19114 0.19104 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21289e-07 ( -1.7626e-08 1.7347e-08 ) ergs/cm2
Band function
Time interval is from 36.128 sec. to 37.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.882780 ( -0.314514 0.340598 )
beta : -9.23402 ( -0.765976 4.92633 )
Epeak [keV] : 149.996 ( -44.9777 285.195 )
Norm@50keV : 5.136164E-02 ( -1.445229E-02 2.205900E-02) )
------------------------------------------------------------
Chi-Squared = 46.17893 using 59 PHA bins.
Reduced chi-squared = 0.8396170 for 55 degrees of freedom
Null hypothesis probability = 0.796
Photon flux (15-150 keV) in 1.000 sec: 3.87231 ( -0.19129 0.19135 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21003e-07 ( -1.7604e-08 1.734e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 11:36:43 EST 2007