batgrbproduct Analysis for Trigger=180931
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 11:45:41 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180931/GCN5_download_cron
======================================================================
Trigger: 00180931 Segment: 000
BAT Trigger Time: 161204936.928 [s; MET]
Trigger Stop: 161204937.312 [s; MET]
UTC: 2006-02-09T19:08:55.921980 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 65.4539954274533 Dec: 58.7297586963454 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.75
Image Trigger?: NO
Rate S/N Ratio: 8.60232526704263 [ if not an image trigger ]
Image S/N Ratio: 6.75
Flight Position: [ source = BAT ]
RA: 65.4539954274533 Dec: 58.7297586963454 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 65.6069629075865 Dec: 58.6637536972016 [deg; J2000]
{ 04h 22m 25.7s , +58d 39' 49.5" }
+/- 6.43469054581841 [arcmin] (estimated 90% radius based on SNR)
+/- 4.63554197066384 [arcmin] (formal 1-sigma fit error)
SNR: 2.1285254994849
RA = 4h 22m 25.7s (65.606963 deg.)
Dec = 58d 39' 50" (58.663754 deg.)
Angular difference between Flight and Ground position is 6.198680 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002593 0.000574 0.004686 0.003185
0.002699 0.002849 0.002465 0.002287 [error]
Peak -0.002593 0.000574 0.004686 0.003185
0.002699 0.002849 0.002465 0.002287 [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 4.97e-11 3.78e-10 2.57e-09 9.29e-08 9.21e-09 8.89e-08 erg/cm2
Error 1.96e-10 6.87e-10 2.41e-09 1.12e-07 7.66e-09 1.22e-07 erg/cm2
Peak flux Power-law 4.16e-03 1.55e-02 5.41e-02 6.23e-01 1.54e-01 6.67e-01 ph/cm2/s
Error 1.61e-02 3.02e-02 5.24e-02 7.49e-01 1.42e-01 6.88e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-11 3.11e-10 3.01e-09 3.42e-08 9.95e-09 3.56e-08 erg/cm2
Error 1.88e-10 6.74e-10 3.07e-09 1.31e-07 8.15e-09 1.85e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-03 1.32e-02 6.27e-02 2.82e-01 1.63e-01 4.59e-01 ph/cm2/s
Error 1.55e-02 3.07e-02 6.62e-02 1.12e+00 1.43e-01 0.00e+00 ph/cm2/s
Fluence Band 2.57e-11 3.19e-10 3.00e-09 3.43e-08 9.94e-09 1.79e-10 erg/cm2
Error 1.86e-10 7.29e-10 3.14e-09 1.75e-07 8.20e-09 0.00e+00 erg/cm2
Peak flux Band 1.95e-03 1.27e-02 6.31e-02 2.80e-01 1.63e-01 4.26e-01 ph/cm2/s
Error 1.54e-02 3.04e-02 6.89e-02 7.61e-01 1.43e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.756 1.823 - - 8.01e-04 1.09e-03 47.259 57
CPL -0.798 1.817 9998.9 5000.0 8.05e-04 1.10e-03 47.246 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.756 1.823 - - 8.01e-04 1.09e-03 47.259 57
CPL -0.798 1.817 9998.9 5000.0 8.05e-04 1.10e-03 47.246 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
65.6070 +58.6638 0.0902 12.1 -175.3 0.0108 2.1 TRIG_00180931
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-59.960 -0.960 (delta_t = 59.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.756081 ( -2.24392 1.40166 )
Norm@50keV : 8.010190E-04 ( -8.010190E-04 1.386847E-03) )
------------------------------------------------------------
Chi-Squared = 47.25872 using 59 PHA bins.
Reduced chi-squared = 0.8291004 for 57 degrees of freedom
Null hypothesis probability = 0.818
Photon flux (15-150 keV) in 0.3840 sec: 0.153655 ( -0.153655 0.129681 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20567e-09 ( -9.20567e-09 6.11443e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.798054 ( -2.20195 1.43182 )
Epeak [keV] : 9998.91 ( -9998.90 1.08984 )
Norm@50keV : 8.046129E-04 ( -8.046129E-04 1.404090E-03) )
------------------------------------------------------------
Chi-Squared = 47.24643 using 59 PHA bins.
Reduced chi-squared = 0.8436862 for 56 degrees of freedom
Null hypothesis probability = 0.791
Photon flux (15-150 keV) in 0.3840 sec: 0.162956 ( -0.162956 0.122682 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94956e-09 ( -9.94956e-09 6.34625e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31543 ( -15.0000 3.671646E-05) )
beta : 0.651991 ( -2.12510 9.34830 )
Epeak [keV] : 47.6910 ( -47.6598 9952.24 )
Norm@50keV : 9.362442E-04 ( -9.149897E-02 3357.91 )
------------------------------------------------------------
Chi-Squared = 47.27060 using 59 PHA bins.
Reduced chi-squared = 0.8594655 for 55 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 0.3840 sec: 0.163006 ( -0.163006 0.122646 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94141e-09 ( -9.94141e-09 6.45926e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.756081 ( -2.24392 1.40166 )
Norm@50keV : 8.010190E-04 ( -8.010190E-04 1.386847E-03) )
------------------------------------------------------------
Chi-Squared = 47.25872 using 59 PHA bins.
Reduced chi-squared = 0.8291004 for 57 degrees of freedom
Null hypothesis probability = 0.818
Photon flux (15-150 keV) in 0.3840 sec: 0.153655 ( -0.153655 0.129681 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.20567e-09 ( -9.20567e-09 6.11443e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.798054 ( -2.20195 1.43182 )
Epeak [keV] : 9998.91 ( -9998.90 1.08984 )
Norm@50keV : 8.046129E-04 ( -8.046129E-04 1.404090E-03) )
------------------------------------------------------------
Chi-Squared = 47.24643 using 59 PHA bins.
Reduced chi-squared = 0.8436862 for 56 degrees of freedom
Null hypothesis probability = 0.791
Photon flux (15-150 keV) in 0.3840 sec: 0.162956 ( -0.162956 0.122682 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94956e-09 ( -9.94956e-09 6.34625e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31543 ( -15.0000 3.671646E-05) )
beta : 0.651991 ( -2.12510 9.34830 )
Epeak [keV] : 47.6910 ( -47.6598 9952.24 )
Norm@50keV : 9.362442E-04 ( -9.149897E-02 3357.91 )
------------------------------------------------------------
Chi-Squared = 47.27060 using 59 PHA bins.
Reduced chi-squared = 0.8594655 for 55 degrees of freedom
Null hypothesis probability = 0.761
Photon flux (15-150 keV) in 0.3840 sec: 0.163006 ( -0.163006 0.122646 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94141e-09 ( -9.94141e-09 6.45926e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 11:52:37 EST 2007