batgrbproduct Analysis for Trigger=202035
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 31 14:49:31 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger202035/GCN5_download_cron
======================================================================
Trigger: 00202035 Segment: 000
BAT Trigger Time: 164422544 [s; MET]
Trigger Stop: 164422616 [s; MET]
UTC: 2006-03-19T00:55:42.920580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.369724300677 Dec: 59.9902443826169 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.87
Flight Position: [ source = BAT ]
RA: 176.369724300677 Dec: 59.9902443826169 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 176.386483929677 Dec: 60.0355016887842 [deg; J2000]
{ 11h 45m 32.8s , +60d 02' 07.8" }
+/- 2.17813230843602 [arcmin] (estimated 90% radius based on SNR)
+/- 0.789577879291675 [arcmin] (formal 1-sigma fit error)
SNR: 10.0032441774842
RA = 11h 45m 32.8s (176.386484 deg.)
Dec = 60d 2' 8" (60.035502 deg.)
Angular difference between Flight and Ground position is 2.761558 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 10.5680000185966 +/- 2.05705129906504
Measured from: 2.53999999165535
to: 13.108000010252 [s; relative to TRIGTIME]
T50: 4.91600000858307 +/- 1.74840843216897
Measured from: 4.44400000572205
to: 9.36000001430511 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.05599999427795
to: 5.05599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.967999994754791
to: 14.4280000030994 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.281518 0.194788 0.085461 0.043181
0.019083 0.019169 0.017012 0.015096 [error]
Peak 0.057472 0.046208 0.022127 0.005801
0.005785 0.005879 0.005008 0.004208 [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 7.69e-08 8.58e-08 6.83e-08 8.99e-08 2.64e-07 3.21e-07 erg/cm2
Error 1.13e-08 9.45e-09 1.61e-08 4.17e-08 3.45e-08 6.03e-08 erg/cm2
Peak flux Power-law 5.23e-01 3.56e-01 1.58e-01 9.75e-02 1.09e+00 1.14e+00 ph/cm2/s
Error 9.46e-02 4.74e-02 4.03e-02 4.69e-02 1.40e-01 1.49e-01 ph/cm2/s
Fluence Cutoff-PL 7.70e-08 8.58e-08 6.81e-08 8.89e-08 2.64e-07 3.21e-07 erg/cm2
Error 1.13e-08 9.46e-09 1.61e-08 4.14e-08 3.45e-08 6.00e-08 erg/cm2
Peak flux Cutoff-PL 5.21e-01 3.58e-01 1.58e-01 8.76e-02 1.08e+00 1.12e+00 ph/cm2/s
Error 9.92e-02 4.10e-02 3.30e-02 6.91e-02 1.40e-01 1.63e-01 ph/cm2/s
Fluence Band 7.52e-08 8.55e-08 6.84e-08 9.06e-08 2.64e-07 3.27e-07 erg/cm2
Error 9.61e-09 9.15e-09 7.30e-09 3.92e-08 2.22e-08 7.11e-08 erg/cm2
Peak flux Band 5.21e-01 3.63e-01 1.54e-01 8.96e-02 1.08e+00 1.13e+00 ph/cm2/s
Error 9.91e-02 6.19e-02 3.99e-02 6.18e-02 1.42e-01 1.55e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.330 0.250 - - 2.04e-03 3.38e-04 58.779 57
CPL 1.993 0.000 1.0 13.3 3.06e-03 4.77e-04 60.811 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.169 0.276 - - 6.66e-03 1.26e-03 58.318 57
CPL 1.960 0.000 7.8 0.0 8.86e-03 2.28e-03 58.353 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: 4.672000 sec.
T50 in the 50-300 keV band: 2.432000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.460 0.968 14.428
T90 10.568 2.540 13.108
T50 4.916 4.444 9.360
Peak 1.000 4.056 5.056
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
176.3865 +60.0355 0.0193 10.8 143.3 0.7502 10.0 TRIG_00202035
------------------------------------------
Foreground time interval of the image:
0.968 14.428 (delta_t = 13.460 [sec])
Background time interval of the image:
-2.699 0.968 (delta_t = 3.667 [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 0.968 sec. to 14.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33046 ( -0.240396 0.258705 )
Norm@50keV : 2.041613E-03 ( -3.430872E-04 3.338112E-04) )
------------------------------------------------------------
Chi-Squared = 58.77863 using 59 PHA bins.
Reduced chi-squared = 1.031204 for 57 degrees of freedom
Null hypothesis probability = 0.410
Photon flux (15-150 keV) in 13.46 sec: 0.362934 ( -0.037082 0.037106 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64163e-07 ( -3.39246e-08 3.51266e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.968 sec. to 14.428 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99314 ( )
Epeak [keV] : 0.989871 ( -0.286413 26.3707 )
Norm@50keV : 3.055551E-03 ( -5.861020E-04 3.679295E-04) )
------------------------------------------------------------
Chi-Squared = 60.81057 using 59 PHA bins.
but latest trial 2.440001E-03 gives Chi-Squared = 2.73659
Reduced chi-squared = 1.085903 for 56 degrees of freedom
Null hypothesis probability = 0.307
Photon flux (15-150 keV) in 13.46 sec: 0.362771 ( -0.037067 0.037091 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6403e-07 ( -3.38398e-08 3.51939e-08 ) ergs/cm2
Band function
Time interval is from 0.968 sec. to 14.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50503 ( -9.202957E-04 14.9991 )
beta : -2.24553 ( -0.259178 0.240383 )
Epeak [keV] : 7.77800 ( -7.67800 9992.22 )
Norm@50keV : 1.315987E-02 ( -4.664314E-02 4.536554E-02) )
------------------------------------------------------------
Chi-Squared = 59.10316 using 59 PHA bins.
Reduced chi-squared = 1.074603 for 55 degrees of freedom
Null hypothesis probability = 0.328
Photon flux (15-150 keV) in 13.46 sec: 0.363083 ( -0.036961 0.037 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64222e-07 ( -1.7642e-08 2.68527e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.056 sec. to 5.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16859 ( -0.263226 0.287799 )
Norm@50keV : 6.664238E-03 ( -1.285329E-03 1.244370E-03) )
------------------------------------------------------------
Chi-Squared = 58.31802 using 59 PHA bins.
Reduced chi-squared = 1.023123 for 57 degrees of freedom
Null hypothesis probability = 0.427
Photon flux (15-150 keV) in 1.000 sec: 1.08539 ( -0.140235 0.14024 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24248e-08 ( -1.01931e-08 1.05287e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.056 sec. to 5.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95957 ( )
Epeak [keV] : 7.83248 ( )
Norm@50keV : 8.860403E-03 ( -3.203851E-03 1.355362E-03) )
------------------------------------------------------------
Chi-Squared = 58.35289 using 59 PHA bins.
Reduced chi-squared = 1.042016 for 56 degrees of freedom
Null hypothesis probability = 0.389
Photon flux (15-150 keV) in 1.000 sec: 1.08287 ( -0.1399 0.13989 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17539e-08 ( -1.2569e-08 1.11664e-08 ) ergs/cm2
Band function
Time interval is from 4.056 sec. to 5.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49227 ( -8.50774 6.49226 )
beta : -2.26558 ( -7.73442 0.350465 )
Epeak [keV] : 20.6079 ( -20.5079 306.055 )
Norm@50keV : 2.039588E-02 ( -1.746050E-02 2188.14 )
------------------------------------------------------------
Chi-Squared = 58.11650 using 59 PHA bins.
Reduced chi-squared = 1.056664 for 55 degrees of freedom
Null hypothesis probability = 0.361
Photon flux (15-150 keV) in 1.000 sec: 1.08253 ( -0.143605 0.14134 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Dec 31 14:59:18 EST 2007