batgrbproduct Analysis for Trigger=318170
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 Jul 28 11:08:39 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger318170/GCN5_download_cron
======================================================================
Trigger: 00318170 Segment: 000
BAT Trigger Time: 238892858.368 [s; MET]
Trigger Stop: 238892859.392 [s; MET]
UTC: 2008-07-27T23:07:35.394100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.6448768441636 Dec: 64.1515714708512 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.95
Image Trigger?: NO
Rate S/N Ratio: 13.3416640641263 [ if not an image trigger ]
Image S/N Ratio: 7.95
Flight Position: [ source = BAT ]
RA: 32.6448768441636 Dec: 64.1515714708512 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.6381705073555 Dec: 64.1301633364591 [deg; J2000]
{ 02h 10m 33.2s , +64d 07' 48.6" }
+/- 0.823334794561084 [arcmin] (estimated 90% radius based on SNR)
+/- 0.318446797267241 [arcmin] (formal 1-sigma fit error)
SNR: 40.153501577756
Angular difference between Flight and Ground position is 1.296422 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 79.7080000042915 +/- 8.77073339525092
Measured from: 1.73199999332428
to: 81.4399999976158 [s; relative to TRIGTIME]
T50: 23.919999986887 +/- 1.46396175474034
Measured from: 15.0480000078678
to: 38.9679999947548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.2319999933243
to: 16.2319999933243 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.31600001454353
to: 116.291999995708 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.818374 2.944152 2.525056 0.570972
0.059532 0.061799 0.057351 0.050664 [error]
Peak 0.059922 0.103141 0.110149 0.018347
0.006459 0.007320 0.006944 0.005472 [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 5.75e-07 1.19e-06 1.93e-06 7.01e-06 5.34e-06 1.07e-05 erg/cm2
Error 3.04e-08 3.66e-08 5.95e-08 5.01e-07 1.49e-07 5.32e-07 erg/cm2
Peak flux Power-law 5.90e-01 7.29e-01 6.55e-01 1.02e+00 2.32e+00 2.99e+00 ph/cm2/s
Error 7.92e-02 6.06e-02 5.47e-02 1.77e-01 1.71e-01 2.34e-01 ph/cm2/s
Fluence Cutoff-PL 5.17e-07 1.22e-06 2.00e-06 4.00e-06 5.18e-06 7.71e-06 erg/cm2
Error 3.89e-08 4.02e-08 6.84e-08 9.68e-07 1.66e-07 9.70e-07 erg/cm2
Peak flux Cutoff-PL 4.86e-01 7.72e-01 7.15e-01 4.79e-01 2.25e+00 2.45e+00 ph/cm2/s
Error 9.90e-02 7.03e-02 6.83e-02 2.22e-01 1.76e-01 2.82e-01 ph/cm2/s
Fluence Band 5.05e-07 1.22e-06 1.98e-06 5.34e-06 5.18e-06 8.28e-06 erg/cm2
Error 4.91e-08 5.72e-08 7.53e-08 1.76e-06 1.74e-07 0.00e+00 erg/cm2
Peak flux Band 4.86e-01 7.71e-01 7.15e-01 4.79e-01 2.25e+00 2.45e+00 ph/cm2/s
Error 9.90e-02 7.03e-02 6.83e-02 2.21e-01 1.77e-01 2.82e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.304 0.048 - - 4.52e-03 1.17e-04 80.615 57
CPL 0.865 0.205 143.2 50.0 7.15e-03 1.51e-03 65.855 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.155 0.121 - - 1.99e-02 1.44e-03 76.512 57
CPL 0.320 0.565 110.2 57.8 4.88e-02 3.13e-02 68.682 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: 78.592000 sec.
T50 in the 50-300 keV band: 22.208000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 119.608 -3.316 116.292
T90 79.708 1.732 81.440
T50 23.920 15.048 38.968
Peak 1.000 15.232 16.232
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.6382 +64.1302 0.0048 20.2 -64.6 2.3597 40.2 TRIG_00318170
------------------------------------------
Foreground time interval of the image:
-3.316 16.633 (delta_t = 19.949 [sec])
Background time interval of the image:
-239.368 -90.358 (delta_t = 149.010 [sec])
-71.368 -3.316 (delta_t = 68.052 [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 -3.316 sec. to 116.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30373 ( -4.820335E-02 4.808116E-02) )
Norm@50keV : 4.521749E-03 ( -1.169341E-04 1.169285E-04) )
------------------------------------------------------------
Chi-Squared = 80.61517 using 59 PHA bins.
Reduced chi-squared = 1.414301 for 57 degrees of freedom
Null hypothesis probability = 2.146E-02
Photon flux (15-150 keV) in 119.6 sec: 0.539830 ( -0.014975 0.015002 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33829e-06 ( -1.47634e-07 1.49835e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.316 sec. to 116.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.865396 ( -0.209691 0.199828 )
Epeak [keV] : 143.227 ( -28.9881 70.9185 )
Norm@50keV : 7.149904E-03 ( -1.316905E-03 1.693647E-03) )
------------------------------------------------------------
Chi-Squared = 65.85450 using 59 PHA bins.
Reduced chi-squared = 1.175973 for 56 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 119.6 sec: 0.524425 ( -0.016317 0.016242 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18388e-06 ( -1.66017e-07 1.65742e-07 ) ergs/cm2
Band function
Time interval is from -3.316 sec. to 116.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.704035 ( -0.407917 2.48938 )
beta : -1.56707 ( -1.52567 0.203873 )
Epeak [keV] : 109.045 ( -71.9562 102.703 )
Norm@50keV : 8.801071E-03 ( -2.068503E-03 11.3819 )
------------------------------------------------------------
Chi-Squared = 65.73764 using 59 PHA bins.
Reduced chi-squared = 1.195230 for 55 degrees of freedom
Null hypothesis probability = 0.152
Photon flux (15-150 keV) in 119.6 sec: 0.522924 ( -0.01673 0.016765 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17605e-06 ( -1.67141e-07 1.8056e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15500 ( -0.120995 0.120384 )
Norm@50keV : 1.992297E-02 ( -1.437534E-03 1.437543E-03) )
------------------------------------------------------------
Chi-Squared = 76.51199 using 59 PHA bins.
Reduced chi-squared = 1.342316 for 57 degrees of freedom
Null hypothesis probability = 4.330E-02
Photon flux (15-150 keV) in 1.000 sec: 2.32483 ( -0.17056 0.17067 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04818e-07 ( -1.6593e-08 1.6626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.320092 ( -0.603652 0.526239 )
Epeak [keV] : 110.164 ( -25.2293 90.3231 )
Norm@50keV : 4.882293E-02 ( -2.063484E-02 4.190119E-02) )
------------------------------------------------------------
Chi-Squared = 68.68163 using 59 PHA bins.
Reduced chi-squared = 1.226458 for 56 degrees of freedom
Null hypothesis probability = 0.119
Photon flux (15-150 keV) in 1.000 sec: 2.25329 ( -0.17567 0.1765 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9612e-07 ( -1.7791e-08 1.7712e-08 ) ergs/cm2
Band function
Time interval is from 15.232 sec. to 16.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.320117 ( -0.526209 0.371379 )
beta : -7.39978 ( -2.60022 7.20391 )
Epeak [keV] : 110.140 ( -24.5767 90.3173 )
Norm@50keV : 4.882490E-02 ( -2.063870E-02 4.192556E-02) )
------------------------------------------------------------
Chi-Squared = 68.68181 using 59 PHA bins.
Reduced chi-squared = 1.248760 for 55 degrees of freedom
Null hypothesis probability = 0.102
Photon flux (15-150 keV) in 1.000 sec: 2.25349 ( -0.17727 0.17644 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96084e-07 ( -1.7844e-08 1.7629e-08 ) ergs/cm2
Plot creation:
Mon Jul 28 11:30:52 EDT 2008