batgrbproduct Analysis for Trigger=147704
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 Jan 8 09:36:30 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147704/SDC
======================================================================
Trigger: 00147704 Segment: 000
BAT Trigger Time: 143999872 [s; MET]
Trigger Stop: 144001904 [s; MET]
UTC: 2005-07-25T15:57:52.359880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.259862198867 Dec: -16.4663689650965 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33306
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33306
Flight Position: [ source = BAT ]
RA: 264.259862198867 Dec: -16.4663689650965 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.201149779188 Dec: -16.6274922693848 [deg; J2000]
{ 17h 36m 48.3s , -16d 37' 39.0" }
+/- 10.0350991110577 [arcmin] (estimated 90% radius based on SNR)
+/- 8.12427503440233 [arcmin] (formal 1-sigma fit error)
SNR: 1.12816635220737
RA = 17h 36m 48.3s (264.201150 deg.)
Dec = -16d 37' 39" (-16.627492 deg.)
Angular difference between Flight and Ground position is 10.240202 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 2032 +/-
Measured from: 0
to: 2032 [s; relative to TRIGTIME]
T50: 2032 +/-
Measured from: 0
to: 2032 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2032 second)
Measured from: 0
to: 2032 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2032 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.010836 0.046787 0.022428 0.057447
0.040419 0.037978 0.035032 0.036750 [error]
Peak -0.010836 0.046787 0.022428 0.057447
0.040419 0.037978 0.035032 0.036750 [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 1.37e-10 1.75e-09 2.11e-08 2.05e-06 9.85e-08 1.94e-06 erg/cm2
Error 1.77e-09 6.69e-09 2.76e-08 1.80e-06 9.82e-08 1.82e-06 erg/cm2
Peak flux Power-law 9.97e-05 6.84e-04 4.13e-03 1.22e-01 1.41e-02 1.27e-01 ph/cm2/s
Error 1.39e-03 2.80e-03 5.62e-03 9.91e-02 1.55e-02 9.95e-02 ph/cm2/s
Fluence Cutoff-PL 1.04e-10 1.51e-09 2.01e-08 2.30e-06 9.88e-08 2.31e-06 erg/cm2
Error 1.65e-09 6.47e-09 2.73e-08 2.02e-06 9.84e-08 2.04e-06 erg/cm2
Peak flux Cutoff-PL 7.81e-05 5.88e-04 3.92e-03 1.36e-01 1.39e-02 1.41e-01 ph/cm2/s
Error 1.29e-03 2.70e-03 5.55e-03 1.19e-01 1.53e-02 1.11e-01 ph/cm2/s
Fluence Band 8.99e-11 7.76e-10 1.77e-08 1.65e-06 1.20e-07 2.24e-06 erg/cm2
Error 2.48e-08 6.18e-06 1.04e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 6.41e-06 1.75e-04 3.30e-03 1.13e-01 1.58e-02 1.61e-01 ph/cm2/s
Error 9.42e-04 2.26e-03 5.81e-03 3.32e-01 1.58e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.541 6.500 - - 4.57e-05 1.06e-04 56.598 57
CPL -2.171 6.500 9999.2 5000.0 2.72e-05 9.99e-05 56.286 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.541 6.500 - - 4.57e-05 1.06e-04 56.598 57
CPL -2.171 6.500 9999.2 5000.0 2.72e-05 9.99e-05 56.286 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 2032.000 0.000 2032.000
T90 2032.000 0.000 2032.000
T50 2032.000 0.000 2032.000
Peak 2032.000 0.000 2032.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.2011 -16.6275 0.1709 19.9 55.7 0.0919 1.1 TRIG_00147704
------------------------------------------
Foreground time interval of the image:
401.000 421.117 (delta_t = 20.117 [sec])
549.000 569.072 (delta_t = 20.072 [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
Multiple GTIs in the spectrum
tstart tstop
401.000000 421.116900
549.000000 569.071600
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.54122 ( -1.45878 11.5412 )
Norm@50keV : 4.565529E-05 ( -4.565529E-05 1.669332E-04) )
------------------------------------------------------------
Chi-Squared = 56.59772 using 59 PHA bins.
Reduced chi-squared = 0.9929426 for 57 degrees of freedom
Null hypothesis probability = 0.490
Photon flux (15-150 keV) in 40.19 sec: 1.409284E-02 ( -0.0140928 0.0168385 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85234e-08 ( -9.85234e-08 9.77859e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
401.000000 421.116900
549.000000 569.071600
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17099 ( -0.829014 12.1710 )
Epeak [keV] : 9999.17 ( -9999.16 0.829102 )
Norm@50keV : 2.715311E-05 ( -2.715311E-05 1.725505E-04) )
------------------------------------------------------------
Chi-Squared = 56.28625 using 59 PHA bins.
Reduced chi-squared = 1.005112 for 56 degrees of freedom
Null hypothesis probability = 0.464
Photon flux (15-150 keV) in 40.19 sec: 1.394138E-02 ( -0.0139414 0.016706 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88328e-08 ( -9.88328e-08 9.78671e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
401.000000 421.116900
549.000000 569.071600
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.642512 ( -6.866455E-05 14.9999 )
beta : 1.48127 ( -11.5930 8.40702 )
Epeak [keV] : 18.9841 ( -18.8841 9981.02 )
Norm@50keV : 9.656936E-05 ( -5.773075E-03 2.309150E-02) )
------------------------------------------------------------
Chi-Squared = 56.61255 using 59 PHA bins.
Reduced chi-squared = 1.029319 for 55 degrees of freedom
Null hypothesis probability = 0.415
Photon flux (15-150 keV) in 40.19 sec: 1.579267E-02 ( -0.0157927 0.015786 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19641e-07 ( -1.19641e-07 8.92101e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 549.000 sec. to 569.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.54122 ( -1.45878 11.5412 )
Norm@50keV : 4.565529E-05 ( -4.565529E-05 1.669332E-04) )
------------------------------------------------------------
Chi-Squared = 56.59772 using 59 PHA bins.
Reduced chi-squared = 0.9929426 for 57 degrees of freedom
Null hypothesis probability = 0.490
Photon flux (15-150 keV) in 40.19 sec: 1.409284E-02 ( -0.0140928 0.0168385 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85234e-08 ( -9.85234e-08 9.77859e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 549.000 sec. to 569.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17099 ( -0.829014 12.1710 )
Epeak [keV] : 9999.17 ( -9999.16 0.829102 )
Norm@50keV : 2.715311E-05 ( -2.715311E-05 1.725505E-04) )
------------------------------------------------------------
Chi-Squared = 56.28625 using 59 PHA bins.
Reduced chi-squared = 1.005112 for 56 degrees of freedom
Null hypothesis probability = 0.464
Photon flux (15-150 keV) in 40.19 sec: 1.394138E-02 ( -0.0139414 0.016706 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88328e-08 ( -9.88328e-08 9.78671e-08 ) ergs/cm2
Band function
Time interval is from 549.000 sec. to 569.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.642512 ( -6.866455E-05 14.9999 )
beta : 1.48127 ( -11.5930 8.40702 )
Epeak [keV] : 18.9841 ( -18.8841 9981.02 )
Norm@50keV : 9.656936E-05 ( -5.773075E-03 2.309150E-02) )
------------------------------------------------------------
Chi-Squared = 56.61255 using 59 PHA bins.
Reduced chi-squared = 1.029319 for 55 degrees of freedom
Null hypothesis probability = 0.415
Photon flux (15-150 keV) in 40.19 sec: 1.579267E-02 ( -0.0157927 0.015786 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19641e-07 ( -1.19641e-07 8.92101e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 09:42:09 EST 2008