batgrbproduct Analysis for Trigger=164268
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): Wed Jan 9 18:50:59 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger164268/GCN5_download_hand
======================================================================
Trigger: 00164268 Segment: 000
BAT Trigger Time: 153917479.936 [s; MET]
Trigger Stop: 153917484.032 [s; MET]
UTC: 2005-11-17T10:51:20.091280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 228.404931238687 Dec: 30.8698475591698 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.84
Image Trigger?: NO
Rate S/N Ratio: 11.6189500386223 [ if not an image trigger ]
Image S/N Ratio: 12.84
Flight Position: [ source = BAT ]
RA: 228.404931238687 Dec: 30.8698475591698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.398813646606 Dec: 30.8661434467151 [deg; J2000]
{ 15h 13m 35.7s , +30d 51' 58.1" }
+/- 0.949485621720666 [arcmin] (estimated 90% radius based on SNR)
+/- 0.274648410304515 [arcmin] (formal 1-sigma fit error)
SNR: 32.7550162534362
RA = 15h 13m 35.7s (228.398814 deg.)
Dec = 30d 51' 58" (30.866143 deg.)
Angular difference between Flight and Ground position is 0.385562 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 136.340000003576 +/- 13.0823899991033
Measured from: -10.5919999778271
to: 125.748000025749 [s; relative to TRIGTIME]
T50: 56.3720000088215 +/- 3.74256224048285
Measured from: 13.9399999976158
to: 70.3120000064373 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.61599999666214
to: 3.61599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.7479999959469
to: 148.356000006199 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.609425 2.883319 1.717195 0.292087
0.070652 0.072126 0.064026 0.056670 [error]
Peak 0.039692 0.045957 0.017657 0.004400
0.006160 0.006325 0.005557 0.004718 [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 8.56e-07 1.27e-06 1.41e-06 2.96e-06 4.44e-06 6.51e-06 erg/cm2
Error 5.61e-08 4.65e-08 6.85e-08 3.23e-07 1.58e-07 3.65e-07 erg/cm2
Peak flux Power-law 4.45e-01 3.12e-01 1.44e-01 9.31e-02 9.46e-01 9.94e-01 ph/cm2/s
Error 9.97e-02 5.39e-02 4.36e-02 5.21e-02 1.60e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 7.98e-07 1.30e-06 1.44e-06 1.88e-06 4.32e-06 5.43e-06 erg/cm2
Error 7.35e-08 5.26e-08 7.33e-08 7.35e-07 1.90e-07 7.64e-07 erg/cm2
Peak flux Cutoff-PL 4.15e-01 3.55e-01 1.35e-01 2.28e-02 9.23e-01 9.27e-01 ph/cm2/s
Error 1.10e-01 7.47e-02 5.71e-02 5.82e-02 1.61e-01 1.67e-01 ph/cm2/s
Fluence Band 7.91e-07 1.30e-06 1.43e-06 1.88e-06 4.31e-06 5.57e-06 erg/cm2
Error 7.28e-08 5.25e-08 7.32e-08 7.35e-07 1.90e-07 7.48e-07 erg/cm2
Peak flux Band 4.15e-01 3.55e-01 1.35e-01 2.27e-02 9.23e-01 9.27e-01 ph/cm2/s
Error 1.10e-01 5.58e-02 4.24e-02 5.71e-02 1.61e-01 1.67e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.849 0.070 - - 2.73e-03 9.62e-05 47.607 57
CPL 1.475 0.300 71.6 71.5 4.13e-03 1.34e-03 43.706 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.114 0.319 - - 5.97e-03 1.38e-03 47.164 57
CPL 1.038 1.500 34.8 5000.0 2.68e-02 2.12e-01 44.944 0
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: 127.872000 sec.
T50 in the 50-300 keV band: 54.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 177.104 -28.748 148.356
T90 136.340 -10.592 125.748
T50 56.372 13.940 70.312
Peak 1.000 2.616 3.616
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.3988 +30.8661 0.0059 29.2 -141.9 3.2149 32.8 TRIG_00164268
------------------------------------------
Foreground time interval of the image:
-28.748 33.365 (delta_t = 62.113 [sec])
Background time interval of the image:
-299.936 -49.783 (delta_t = 250.153 [sec])
-48.936 -28.748 (delta_t = 20.188 [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 -28.748 sec. to 148.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84866 ( -6.969988E-02 7.026219E-02) )
Norm@50keV : 2.727550E-03 ( -9.645871E-05 9.603240E-05) )
------------------------------------------------------------
Chi-Squared = 47.60735 using 59 PHA bins.
Reduced chi-squared = 0.8352166 for 57 degrees of freedom
Null hypothesis probability = 0.808
Photon flux (15-150 keV) in 177.1 sec: 0.383177 ( -0.014704 0.014794 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44174e-06 ( -1.57902e-07 1.58079e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.748 sec. to 148.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47524 ( -0.270480 0.329544 )
Epeak [keV] : 71.5725 ( -12.3642 130.607 )
Norm@50keV : 4.133105E-03 ( -1.246217E-03 1.425661E-03) )
------------------------------------------------------------
Chi-Squared = 43.70632 using 59 PHA bins.
Reduced chi-squared = 0.7804700 for 56 degrees of freedom
Null hypothesis probability = 0.884
Photon flux (15-150 keV) in 177.1 sec: 0.372268 ( -0.01716 0.017222 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31892e-06 ( -1.90666e-07 1.88948e-07 ) ergs/cm2
Band function
Time interval is from -28.748 sec. to 148.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41140 ( -0.247111 0.357854 )
beta : -2.16004 ( -7.11536 1.00780 )
Epeak [keV] : 66.0305 ( -21.4156 113.254 )
Norm@50keV : 4.483914E-03 ( -3.986374E-03 1.556052E-03) )
------------------------------------------------------------
Chi-Squared = 43.91114 using 59 PHA bins.
Reduced chi-squared = 0.7983844 for 55 degrees of freedom
Null hypothesis probability = 0.858
Photon flux (15-150 keV) in 177.1 sec: 0.372281 ( -0.017184 0.017275 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31439e-06 ( -1.91126e-07 1.89515e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.616 sec. to 3.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11449 ( -0.303102 0.335769 )
Norm@50keV : 5.967320E-03 ( -1.399096E-03 1.362892E-03) )
------------------------------------------------------------
Chi-Squared = 47.16368 using 59 PHA bins.
Reduced chi-squared = 0.8274330 for 57 degrees of freedom
Null hypothesis probability = 0.820
Photon flux (15-150 keV) in 1.000 sec: 0.945647 ( -0.160041 0.160043 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55347e-08 ( -1.1435e-08 1.19065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.616 sec. to 3.616 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03765 ( -1.86721 1.13350 )
Epeak [keV] : 34.7908 ( -34.7808 9965.21 )
Norm@50keV : 2.683510E-02 ( -2.683510E-02 0.398042 )
------------------------------------------------------------
Chi-Squared = 44.94387 using 59 PHA bins.
but latest trial 2.02175 gives Chi-Squared = 2.46239
Reduced chi-squared = 0.8025692 for 56 degrees of freedom
Null hypothesis probability = 0.855
Photon flux (15-150 keV) in 1.000 sec: 0.923129 ( -0.160888 0.161341 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04585e-08 ( -1.15997e-08 1.30675e-08 ) ergs/cm2
Band function
Time interval is from 2.616 sec. to 3.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04290 ( -8.95710 1.87048 )
beta : -9.13958 ( -0.860415 19.1396 )
Epeak [keV] : 34.7307 ( -34.6307 9965.27 )
Norm@50keV : 2.666538E-02 ( -2.666538E-02 0.595797 )
------------------------------------------------------------
Chi-Squared = 44.94390 using 59 PHA bins.
Reduced chi-squared = 0.8171619 for 55 degrees of freedom
Null hypothesis probability = 0.831
Photon flux (15-150 keV) in 1.000 sec: 0.923047 ( -0.160726 0.161523 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03929e-08 ( -1.12874e-08 1.30367e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 19:02:52 EST 2008