batgrbproduct Analysis for Trigger=191157
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 12:41:08 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger191157/SDC
======================================================================
Trigger: 00191157 Segment: 000
BAT Trigger Time: 161926472 [s; MET]
Trigger Stop: 161926552 [s; MET]
UTC: 2006-02-18T03:34:30.977720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 50.4036197387777 Dec: 16.8660799646394 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.84
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.84
Flight Position: [ source = BAT ]
RA: 50.4036197387777 Dec: 16.8660799646394 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 50.3775593937223 Dec: 16.912875536654 [deg; J2000]
{ 03h 21m 30.6s , +16d 54' 46.4" }
+/- 2.65159546888502 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31295553223235 [arcmin] (formal 1-sigma fit error)
SNR: 7.55280021218986
RA = 3h 21m 30.6s (50.377559 deg.)
Dec = 16d 54' 46" (16.912876 deg.)
Angular difference between Flight and Ground position is 3.181496 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 80 +/-
Measured from: 0
to: 80 [s; relative to TRIGTIME]
T50: 80 +/-
Measured from: 0
to: 80 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 80 second)
Measured from: 0
to: 80 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 80 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.308617 0.357794 0.068043 -0.088415
0.043336 0.044369 0.040137 0.038665 [error]
Peak 0.308617 0.357794 0.068043 -0.088415
0.043336 0.044369 0.040137 0.038665 [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 1.08e-07 1.21e-07 9.72e-08 1.29e-07 3.74e-07 4.56e-07 erg/cm2
Error 2.09e-08 2.16e-08 3.27e-08 8.15e-08 7.74e-08 1.28e-07 erg/cm2
Peak flux Power-law 4.44e-02 2.77e-02 1.11e-02 5.98e-03 8.62e-02 8.91e-02 ph/cm2/s
Error 8.73e-03 4.79e-03 3.61e-03 3.52e-03 1.38e-02 1.45e-02 ph/cm2/s
Fluence Cutoff-PL 1.02e-07 1.48e-07 6.28e-08 4.84e-09 3.18e-07 3.18e-07 erg/cm2
Error 2.32e-08 3.11e-08 4.38e-08 3.05e-08 7.22e-08 7.88e-08 erg/cm2
Peak flux Cutoff-PL 4.11e-02 3.38e-02 7.73e-03 3.26e-04 8.30e-02 8.30e-02 ph/cm2/s
Error 9.78e-03 6.98e-03 4.94e-03 1.67e-03 1.36e-02 1.37e-02 ph/cm2/s
Fluence Band 1.00e-07 1.50e-07 5.64e-08 7.42e-09 3.13e-07 3.15e-07 erg/cm2
Error 2.33e-08 3.08e-08 4.25e-08 6.46e-08 7.84e-08 1.14e-07 erg/cm2
Peak flux Band 3.96e-02 3.52e-02 6.20e-03 1.11e-04 8.11e-02 8.11e-02 ph/cm2/s
Error 9.57e-03 6.19e-03 2.44e-03 9.91e-04 1.72e-02 1.45e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.320 0.321 - - 4.88e-04 1.22e-04 46.204 57
CPL 0.201 2.175 29.1 18.5 1.15e-02 3.39e-01 41.447 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.320 0.321 - - 4.88e-04 1.22e-04 46.204 57
CPL 0.201 2.175 29.1 18.5 1.15e-02 3.39e-01 41.447 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 80.000 0.000 80.000
T90 80.000 0.000 80.000
T50 80.000 0.000 80.000
Peak 80.000 0.000 80.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
50.3776 +16.9129 0.0253 25.0 178.4 0.6921 7.6 TRIG_00191157
------------------------------------------
Foreground time interval of the image:
0.000 80.000 (delta_t = 80.000 [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 80.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32037 ( -0.302389 0.340463 )
Norm@50keV : 4.877083E-04 ( -1.222869E-04 1.214680E-04) )
------------------------------------------------------------
Chi-Squared = 46.20377 using 59 PHA bins.
Reduced chi-squared = 0.8105924 for 57 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 80.00 sec: 8.620641E-02 ( -0.0137732 0.0137826 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74326e-07 ( -7.5372e-08 7.94464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 80.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.201354 ( -2.61959 1.72996 )
Epeak [keV] : 29.1195 ( -29.1095 7.81556 )
Norm@50keV : 1.148824E-02 ( -1.148824E-02 0.667245 )
------------------------------------------------------------
Chi-Squared = 41.44704 using 59 PHA bins.
Reduced chi-squared = 0.7401258 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 80.00 sec: 8.297813E-02 ( -0.0135691 0.013707 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17736e-07 ( -6.42776e-08 8.0196e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 80.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34556 ( -1.09472 3.54106 )
beta : -9.30306 ( -0.791290 19.2087 )
Epeak [keV] : 23.7324 ( -11.1728 8.02285 )
Norm@50keV : 2.076526E-03 ( -3.124803E-03 2.72460 )
------------------------------------------------------------
Chi-Squared = 42.48568 using 59 PHA bins.
Reduced chi-squared = 0.7724668 for 55 degrees of freedom
Null hypothesis probability = 0.891
Photon flux (15-150 keV) in 80.00 sec: 8.109793E-02 ( -0.0126466 0.0217241 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13161e-07 ( -5.93264e-08 9.73904e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 80.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32037 ( -0.302389 0.340463 )
Norm@50keV : 4.877083E-04 ( -1.222869E-04 1.214680E-04) )
------------------------------------------------------------
Chi-Squared = 46.20377 using 59 PHA bins.
Reduced chi-squared = 0.8105924 for 57 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 80.00 sec: 8.620641E-02 ( -0.0137732 0.0137826 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74326e-07 ( -7.5372e-08 7.94464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 80.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.201354 ( -2.61959 1.72996 )
Epeak [keV] : 29.1195 ( -29.1095 7.81556 )
Norm@50keV : 1.148824E-02 ( -1.148824E-02 0.667245 )
------------------------------------------------------------
Chi-Squared = 41.44704 using 59 PHA bins.
Reduced chi-squared = 0.7401258 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 80.00 sec: 8.297813E-02 ( -0.0135691 0.013707 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17736e-07 ( -6.42776e-08 8.0196e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 80.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34556 ( -1.95090 3.54219 )
beta : -9.30306 ( -6.12711 13.8729 )
Epeak [keV] : 23.7324 ( -28.3100 8.84833 )
Norm@50keV : 2.076526E-03 ( -5.457319E-03 2.79077 )
------------------------------------------------------------
Chi-Squared = 42.48568 using 59 PHA bins.
Reduced chi-squared = 0.7724668 for 55 degrees of freedom
Null hypothesis probability = 0.891
Photon flux (15-150 keV) in 80.00 sec: 8.109793E-02 ( -0.0126466 0.0217241 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13161e-07 ( -5.93264e-08 9.73904e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 12:59:50 EST 2007