batgrbproduct Analysis for Trigger=316910
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): Tue Jul 15 01:38:17 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger316910/GCN5_download_cron
======================================================================
Trigger: 00316910 Segment: 000
BAT Trigger Time: 237750779.584 [s; MET]
Trigger Stop: 237750780.608 [s; MET]
UTC: 2008-07-14T17:52:56.643300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.109331293591 Dec: -60.2785024938338 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.38
Image Trigger?: NO
Rate S/N Ratio: 51.7783738639985 [ if not an image trigger ]
Image S/N Ratio: 17.38
Flight Position: [ source = BAT ]
RA: 188.109331293591 Dec: -60.2785024938338 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.104304945256 Dec: -60.2741999624025 [deg; J2000]
{ 12h 32m 25.0s , -60d 16' 27.1" }
+/- 0.863850641070094 [arcmin] (estimated 90% radius based on SNR)
+/- 0.296249750393761 [arcmin] (formal 1-sigma fit error)
SNR: 37.4904190206787
Angular difference between Flight and Ground position is 0.298331 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 32.4799999594688 +/- 9.72107977190457
Measured from: -2.47999998927116
to: 29.9999999701977 [s; relative to TRIGTIME]
T50: 10.0799999535084 +/- 1.38933079114585
Measured from: 0.0960000157356262
to: 10.175999969244 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.363999992609024
to: 0.636000007390976 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.77599999308586
to: 50.3200000226498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.102968 1.420254 1.203716 0.252800
0.056642 0.057162 0.050837 0.043089 [error]
Peak 0.113164 0.172817 0.174891 0.063798
0.010347 0.011283 0.011111 0.008420 [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 3.52e-07 6.39e-07 8.91e-07 2.59e-06 2.56e-06 4.47e-06 erg/cm2
Error 2.91e-08 3.10e-08 5.12e-08 3.32e-07 1.23e-07 3.65e-07 erg/cm2
Peak flux Power-law 1.07e+00 1.31e+00 1.17e+00 1.79e+00 4.17e+00 5.33e+00 ph/cm2/s
Error 1.38e-01 1.03e-01 8.80e-02 2.89e-01 2.82e-01 3.74e-01 ph/cm2/s
Fluence Cutoff-PL 3.33e-07 6.52e-07 9.09e-07 1.82e-06 2.51e-06 3.58e-06 erg/cm2
Error 3.64e-08 4.37e-08 6.86e-08 9.47e-07 1.36e-07 6.55e-07 erg/cm2
Peak flux Cutoff-PL 1.07e+00 1.31e+00 1.17e+00 1.78e+00 4.17e+00 5.32e+00 ph/cm2/s
Error 1.38e-01 1.03e-01 8.81e-02 2.87e-01 2.82e-01 3.73e-01 ph/cm2/s
Fluence Band 3.30e-07 6.49e-07 9.07e-07 1.82e-06 2.51e-06 3.95e-06 erg/cm2
Error 3.65e-08 3.50e-08 5.65e-08 9.56e-07 1.36e-07 8.96e-07 erg/cm2
Peak flux Band 1.03e+00 1.34e+00 1.17e+00 1.72e+00 4.14e+00 5.26e+00 ph/cm2/s
Error 1.26e-01 1.25e-01 1.02e-01 5.09e-01 2.93e-01 4.59e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.520 0.082 - - 5.00e-03 2.23e-04 57.725 57
CPL 1.264 0.325 152.5 4953.3 6.62e-03 2.36e-03 55.906 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.170 0.116 - - 3.56e-02 2.34e-03 57.829 57
CPL 1.094 0.321 647.0 5000.0 3.87e-02 1.42e-02 57.726 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: 21.632000 sec.
T50 in the 50-300 keV band: 5.952000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 54.096 -3.776 50.320
T90 32.480 -2.480 30.000
T50 10.080 0.096 10.176
Peak 1.000 -0.364 0.636
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
188.1043 -60.2742 0.0051 31.6 -66.4 3.2663 37.5 TRIG_00316910
------------------------------------------
Foreground time interval of the image:
-3.776 13.217 (delta_t = 16.993 [sec])
Background time interval of the image:
-239.584 -204.174 (delta_t = 35.410 [sec])
-202.584 -3.776 (delta_t = 198.808 [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 -3.776 sec. to 50.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52006 ( -8.187258E-02 8.225489E-02) )
Norm@50keV : 4.998426E-03 ( -2.234597E-04 2.231402E-04) )
------------------------------------------------------------
Chi-Squared = 57.72474 using 59 PHA bins.
Reduced chi-squared = 1.012715 for 57 degrees of freedom
Null hypothesis probability = 0.448
Photon flux (15-150 keV) in 54.10 sec: 0.627426 ( -0.029408 0.029483 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55688e-06 ( -1.23002e-07 1.23862e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.776 sec. to 50.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26421 ( -0.347817 0.301455 )
Epeak [keV] : 152.513 ( -59.0377 9847.49 )
Norm@50keV : 6.617474E-03 ( -1.735691E-03 2.979476E-03) )
------------------------------------------------------------
Chi-Squared = 55.90602 using 59 PHA bins.
Reduced chi-squared = 0.9983217 for 56 degrees of freedom
Null hypothesis probability = 0.478
Photon flux (15-150 keV) in 54.10 sec: 0.617236 ( -0.031866 0.031886 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51383e-06 ( -1.36846e-07 1.34855e-07 ) ergs/cm2
Band function
Time interval is from -3.776 sec. to 50.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22879 ( -0.337674 0.314931 )
beta : -8.50929 ( -1.49071 7.03690 )
Epeak [keV] : 140.199 ( -46.9171 9859.80 )
Norm@50keV : 6.875262E-03 ( -1.996562E-03 2.740398E-03) )
------------------------------------------------------------
Chi-Squared = 55.93699 using 59 PHA bins.
Reduced chi-squared = 1.017036 for 55 degrees of freedom
Null hypothesis probability = 0.439
Photon flux (15-150 keV) in 54.10 sec: 0.617235 ( -0.03187 0.031978 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51117e-06 ( -1.36456e-07 1.35688e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.368 sec. to 0.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17039 ( -0.115940 0.115152 )
Norm@50keV : 3.564254E-02 ( -2.340939E-03 2.340689E-03) )
------------------------------------------------------------
Chi-Squared = 57.82893 using 59 PHA bins.
Reduced chi-squared = 1.014543 for 57 degrees of freedom
Null hypothesis probability = 0.444
Photon flux (15-150 keV) in 1.008 sec: 4.16711 ( -0.282 0.28246 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67662e-07 ( -2.68249e-08 2.68451e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.368 sec. to 0.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09356 ( -0.456205 0.186209 )
Epeak [keV] : 646.957 ( -646.947 9353.04 )
Norm@50keV : 3.868283E-02 ( -5.172517E-03 2.331383E-02) )
------------------------------------------------------------
Chi-Squared = 57.72562 using 59 PHA bins.
Reduced chi-squared = 1.030815 for 56 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 1.008 sec: 4.16593 ( -0.28191 0.28237 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66578e-07 ( -2.52232e-08 2.7589e-08 ) ergs/cm2
Band function
Time interval is from -0.368 sec. to 0.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.733446 ( -10.3358 2.26732 )
beta : -1.18115 ( -0.161210 0.132357 )
Epeak [keV] : 77.8975 ( -40.0113 888.642 )
Norm@50keV : 7.316875E-02 ( -294.202 1567.79 )
------------------------------------------------------------
Chi-Squared = 57.65179 using 59 PHA bins.
Reduced chi-squared = 1.048214 for 55 degrees of freedom
Null hypothesis probability = 0.377
Photon flux (15-150 keV) in 1.008 sec: 4.14400 ( -0.29161 0.29396 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66123e-07 ( -2.7974e-08 2.76615e-08 ) ergs/cm2
Plot creation:
Tue Jul 15 02:15:25 EDT 2008