batgrbproduct Analysis for Trigger=146986
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 Jan 7 17:15:24 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger146986/GCN5_download_cron
======================================================================
Trigger: 00146986 Segment: 000
BAT Trigger Time: 143617624 [s; MET]
Trigger Stop: 143617688 [s; MET]
UTC: 2005-07-21T05:47:04.367460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.470426336412 Dec: -1.43957201625164 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33500
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33500
Flight Position: [ source = BAT ]
RA: 268.470426336412 Dec: -1.43957201625164 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.407365786168 Dec: -1.45267463579146 [deg; J2000]
{ 17h 53m 37.8s , -01d 27' 09.6" }
+/- 2.72932968704563 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19776050219784 [arcmin] (formal 1-sigma fit error)
SNR: 7.24738342588446
RA = 17h 53m 37.8s (268.407366 deg.)
Dec = -1d 27' 10" (-1.452675 deg.)
Angular difference between Flight and Ground position is 3.863263 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.351212 0.271729 0.144416 0.026004
0.062134 0.054155 0.045603 0.039644 [error]
Peak 0.351212 0.271729 0.144416 0.026004
0.062134 0.054155 0.045603 0.039644 [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 1.09e-07 1.28e-07 1.08e-07 1.56e-07 4.00e-07 4.99e-07 erg/cm2
Error 3.10e-08 2.74e-08 4.36e-08 1.26e-07 9.97e-08 1.78e-07 erg/cm2
Peak flux Power-law 5.56e-02 3.63e-02 1.54e-02 8.93e-03 1.12e-01 1.16e-01 ph/cm2/s
Error 1.62e-02 7.64e-03 5.98e-03 6.67e-03 2.32e-02 2.40e-02 ph/cm2/s
Fluence Cutoff-PL 1.07e-07 1.32e-07 1.07e-07 9.69e-08 3.91e-07 4.38e-07 erg/cm2
Error 3.32e-08 3.37e-08 4.76e-08 1.54e-07 1.07e-07 2.04e-07 erg/cm2
Peak flux Cutoff-PL 5.44e-02 3.73e-02 1.53e-02 6.12e-03 1.11e-01 1.13e-01 ph/cm2/s
Error 1.33e-02 9.32e-03 6.52e-03 8.45e-03 2.37e-02 2.61e-02 ph/cm2/s
Fluence Band 1.06e-07 1.31e-07 1.06e-07 9.69e-08 3.90e-07 4.35e-07 erg/cm2
Error 3.30e-08 3.36e-08 4.85e-08 1.54e-07 1.08e-07 3.95e-07 erg/cm2
Peak flux Band 5.44e-02 3.74e-02 1.53e-02 6.13e-03 1.11e-01 1.13e-01 ph/cm2/s
Error 1.76e-02 9.31e-03 6.58e-03 8.45e-03 2.38e-02 2.61e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.238 0.436 - - 6.61e-04 1.94e-04 62.769 57
CPL 1.969 0.919 4.7 4999.8 9.52e-04 5.34e-03 62.682 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.238 0.436 - - 6.61e-04 1.94e-04 62.769 57
CPL 1.969 1.301 4.7 4999.8 9.52e-04 5.34e-03 62.682 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.4074 -1.4527 0.0267 30.5 30.2 0.8038 7.2 TRIG_00146986
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23776 ( -0.407266 0.465362 )
Norm@50keV : 6.614872E-04 ( -1.981541E-04 1.888615E-04) )
------------------------------------------------------------
Chi-Squared = 62.76870 using 59 PHA bins.
Reduced chi-squared = 1.101205 for 57 degrees of freedom
Null hypothesis probability = 0.279
Photon flux (15-150 keV) in 64.00 sec: 0.111732 ( -0.0231943 0.023217 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00314e-07 ( -9.74835e-08 1.01863e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96878 ( -1.79475 4.251587E-02) )
Epeak [keV] : 4.73786 ( -4.39330 9995.26 )
Norm@50keV : 9.518885E-04 ( -3.694049E-04 1.030747E-02) )
------------------------------------------------------------
Chi-Squared = 62.68231 using 59 PHA bins.
but latest trial 2.00410 gives Chi-Squared = 0.949951
Reduced chi-squared = 1.119327 for 56 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 64.00 sec: 0.110729 ( -0.0238209 0.023529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90954e-07 ( -1.05615e-07 1.07777e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.91968 ( -8.08032 0.208740 )
beta : -8.31798 ( -1.68202 6.48205 )
Epeak [keV] : 10.5049 ( -10.4049 9989.50 )
Norm@50keV : 1.011258E-03 ( -4.022593E-04 5.250188E-04) )
------------------------------------------------------------
Chi-Squared = 62.68781 using 59 PHA bins.
Reduced chi-squared = 1.139778 for 55 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 64.00 sec: 0.110732 ( -0.0238445 0.023799 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90292e-07 ( -1.05741e-07 1.09538e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23776 ( -0.407266 0.465362 )
Norm@50keV : 6.614872E-04 ( -1.981541E-04 1.888615E-04) )
------------------------------------------------------------
Chi-Squared = 62.76870 using 59 PHA bins.
Reduced chi-squared = 1.101205 for 57 degrees of freedom
Null hypothesis probability = 0.279
Photon flux (15-150 keV) in 64.00 sec: 0.111732 ( -0.0231943 0.023217 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00314e-07 ( -9.74835e-08 1.01863e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96878 ( -1.79475 0.807712 )
Epeak [keV] : 4.73786 ( -4.39330 9995.26 )
Norm@50keV : 9.518885E-04 ( -3.694049E-04 1.030747E-02) )
------------------------------------------------------------
Chi-Squared = 62.68231 using 59 PHA bins.
Reduced chi-squared = 1.119327 for 56 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 64.00 sec: 0.110729 ( -0.0238209 0.023529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90954e-07 ( -1.05615e-07 1.07777e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.91968 ( -8.08032 0.208740 )
beta : -8.31798 ( -1.68202 6.48205 )
Epeak [keV] : 10.5049 ( -10.4049 9989.50 )
Norm@50keV : 1.011258E-03 ( -4.022593E-04 5.250188E-04) )
------------------------------------------------------------
Chi-Squared = 62.68781 using 59 PHA bins.
Reduced chi-squared = 1.139778 for 55 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 64.00 sec: 0.110732 ( -0.0238445 0.023799 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90292e-07 ( -1.05741e-07 1.09538e-07 ) ergs/cm2
Plot creation:
Mon Jan 7 17:21:28 EST 2008