batgrbproduct Analysis for Trigger=160640
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 17:01:45 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger160640/GCN5_download_cron
======================================================================
Trigger: 00160640 Segment: 000
BAT Trigger Time: 151598703.616 [s; MET]
Trigger Stop: 151598704.64 [s; MET]
UTC: 2005-10-21T14:45:03.820660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.554746508044 Dec: -23.8229871544646 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33416
Image Trigger?: NO
Rate S/N Ratio: 49.6890329952194 [ if not an image trigger ]
Image S/N Ratio: 33416
Flight Position: [ source = BAT ]
RA: 248.554746508044 Dec: -23.8229871544646 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.56885245246 Dec: -23.8791202181586 [deg; J2000]
{ 16h 34m 16.5s , -23d 52' 44.8" }
+/- 5.15633825959175 [arcmin] (estimated 90% radius based on SNR)
+/- 3.57188763250285 [arcmin] (formal 1-sigma fit error)
SNR: 2.92070577281644
RA = 16h 34m 16.5s (248.568852 deg.)
Dec = -23d 52' 45" (-23.879120 deg.)
Angular difference between Flight and Ground position is 3.455794 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021507 0.031315 -0.003219 -0.005567
0.007640 0.006950 0.006324 0.005756 [error]
Peak 0.021507 0.031315 -0.003219 -0.005567
0.007640 0.006950 0.006324 0.005756 [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 8.72e-09 9.22e-09 6.92e-09 8.39e-09 2.80e-08 3.39e-08 erg/cm2
Error 3.57e-09 3.51e-09 4.57e-09 1.18e-08 1.17e-08 1.81e-08 erg/cm2
Peak flux Power-law 2.80e-01 1.65e-01 6.16e-02 3.07e-02 5.22e-01 5.36e-01 ph/cm2/s
Error 1.17e-01 6.13e-02 3.96e-02 4.05e-02 1.83e-01 1.89e-01 ph/cm2/s
Fluence Cutoff-PL 7.48e-09 1.37e-08 2.86e-09 1.78e-11 2.41e-08 2.41e-08 erg/cm2
Error 3.31e-09 4.88e-09 3.48e-09 6.01e-10 8.25e-09 8.25e-09 erg/cm2
Peak flux Cutoff-PL 2.29e-01 2.47e-01 2.95e-02 1.01e-04 5.06e-01 5.06e-01 ph/cm2/s
Error 1.03e-01 8.34e-02 3.89e-02 3.05e-03 1.20e-01 1.61e-01 ph/cm2/s
Fluence Band 7.77e-09 1.27e-08 5.16e-09 1.21e-09 2.31e-08 2.58e-08 erg/cm2
Error 5.88e-09 4.33e-09 6.92e-09 8.48e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.46e-01 2.25e-01 4.93e-02 1.55e-03 5.26e-01 5.32e-01 ph/cm2/s
Error 1.90e-01 7.50e-02 3.10e-02 1.29e-02 1.69e-01 1.80e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.417 0.652 - - 2.79e-03 1.41e-03 57.020 57
CPL -2.457 0.000 31.2 7.6 3.88e+00 1.44e+01 51.162 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.417 0.652 - - 2.79e-03 1.41e-03 57.020 57
CPL -2.457 0.000 31.2 7.6 3.88e+00 1.44e+01 51.162 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.5689 -23.8791 0.0656 33.3 -44.9 0.0393 2.9 TRIG_00160640
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.616 -7.616 (delta_t = 53.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41662 ( -0.584435 0.719969 )
Norm@50keV : 2.791771E-03 ( -1.383794E-03 1.440109E-03) )
------------------------------------------------------------
Chi-Squared = 57.02027 using 59 PHA bins.
Reduced chi-squared = 1.000356 for 57 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 1.024 sec: 0.521632 ( -0.18254 0.182559 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80107e-08 ( -1.11012e-08 1.22386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.45671 ( )
Epeak [keV] : 31.1818 ( -6.89692 8.33204 )
Norm@50keV : 3.87754 ( -8.38089 20.4988 )
------------------------------------------------------------
Chi-Squared = 51.16230 using 59 PHA bins.
Reduced chi-squared = 0.9136125 for 56 degrees of freedom
Null hypothesis probability = 0.658
Photon flux (15-150 keV) in 1.024 sec: 0.506244 ( -0.157892 0.08279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41013e-08 ( -7.82387e-09 8.67195e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53107 ( -8.46893 6.53106 )
beta : -9.31722 ( -0.682778 7.16952 )
Epeak [keV] : 15.3793 ( -15.2793 33.8078 )
Norm@50keV : 1.253015E-02 ( -10.6482 257.691 )
------------------------------------------------------------
Chi-Squared = 54.80026 using 59 PHA bins.
Reduced chi-squared = 0.9963684 for 55 degrees of freedom
Null hypothesis probability = 0.482
Photon flux (15-150 keV) in 1.024 sec: 0.526183 ( -0.167405 0.169607 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31284e-08 ( -7.26047e-09 6.5835e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.41662 ( -0.584435 0.719969 )
Norm@50keV : 2.791771E-03 ( -1.383794E-03 1.440109E-03) )
------------------------------------------------------------
Chi-Squared = 57.02027 using 59 PHA bins.
Reduced chi-squared = 1.000356 for 57 degrees of freedom
Null hypothesis probability = 0.474
Photon flux (15-150 keV) in 1.024 sec: 0.521632 ( -0.18254 0.182559 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80107e-08 ( -1.11012e-08 1.22386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.45671 ( )
Epeak [keV] : 31.1818 ( -6.89692 8.33204 )
Norm@50keV : 3.87754 ( -8.38089 20.4988 )
------------------------------------------------------------
Chi-Squared = 51.16230 using 59 PHA bins.
Reduced chi-squared = 0.9136125 for 56 degrees of freedom
Null hypothesis probability = 0.658
Photon flux (15-150 keV) in 1.024 sec: 0.506244 ( -0.157892 0.08279 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41013e-08 ( -7.82387e-09 8.67195e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53107 ( -8.46893 6.53106 )
beta : -9.31722 ( -0.682778 7.16952 )
Epeak [keV] : 15.3793 ( -15.2793 33.8078 )
Norm@50keV : 1.253015E-02 ( -10.6482 257.691 )
------------------------------------------------------------
Chi-Squared = 54.80026 using 59 PHA bins.
Reduced chi-squared = 0.9963684 for 55 degrees of freedom
Null hypothesis probability = 0.482
Photon flux (15-150 keV) in 1.024 sec: 0.526183 ( -0.167405 0.169607 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31284e-08 ( -7.26047e-09 6.5835e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 17:07:38 EST 2008