batgrbproduct Analysis for Trigger=147919
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 14:07:13 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147919/SDC
======================================================================
Trigger: 00147919 Segment: 000
BAT Trigger Time: 144279400 [s; MET]
Trigger Stop: 144279464 [s; MET]
UTC: 2005-07-28T21:36:40.354320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.579349701185 Dec: -26.984079061687 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33504
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33504
Flight Position: [ source = BAT ]
RA: 264.579349701185 Dec: -26.984079061687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.486535966613 Dec: -27.0579898428607 [deg; J2000]
{ 17h 37m 56.8s , -27d 03' 28.8" }
+/- 3.66031790406439 [arcmin] (estimated 90% radius based on SNR)
+/- 2.30317195897798 [arcmin] (formal 1-sigma fit error)
SNR: 4.76531390391342
RA = 17h 37m 56.8s (264.486536 deg.)
Dec = -27d 3' 29" (-27.057990 deg.)
Angular difference between Flight and Ground position is 6.654090 arcmin
Partial Coding Fraction: 0.765625 [ 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 0.296503 0.006811 0.012047 -0.022153
0.035957 0.031641 0.026523 0.023189 [error]
Peak 0.296503 0.006811 0.012047 -0.022153
0.035957 0.031641 0.026523 0.023189 [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 8.99e-08 1.83e-08 1.86e-09 2.05e-10 1.10e-07 1.10e-07 erg/cm2
Error 1.98e-08 1.23e-08 3.18e-09 7.47e-10 3.03e-08 3.05e-08 erg/cm2
Peak flux Power-law 9.47e-02 1.12e-02 5.68e-04 3.01e-05 1.07e-01 1.07e-01 ph/cm2/s
Error 2.06e-02 7.16e-03 9.44e-04 1.03e-04 2.51e-02 2.51e-02 ph/cm2/s
Fluence Cutoff-PL 9.75e-08 8.07e-09 2.77e-12 4.17e-20 1.06e-07 1.09e-07 erg/cm2
Error 2.82e-08 1.32e-08 2.50e-09 9.43e-12 2.59e-08 3.16e-08 erg/cm2
Peak flux Cutoff-PL 9.47e-02 1.12e-02 5.66e-04 2.99e-05 1.06e-01 1.06e-01 ph/cm2/s
Error 2.06e-02 7.15e-03 9.42e-04 1.02e-04 2.51e-02 2.51e-02 ph/cm2/s
Fluence Band 6.34e-07 1.30e-07 1.32e-08 2.78e-10 1.14e-07 1.03e-07 erg/cm2
Error 6.86e-06 4.71e-07 3.09e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 9.47e-02 1.12e-02 5.66e-04 2.18e-06 1.07e-01 1.06e-01 ph/cm2/s
Error 2.06e-02 7.15e-03 6.02e-05 2.38e-02 2.51e-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 5.306 1.115 - - 5.14e-05 7.02e-05 39.464 57
CPL 1.512 0.000 2.5 0.0 9.23e-02 0.00e+00 38.644 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.306 1.115 - - 5.14e-05 7.02e-05 39.464 57
CPL 1.512 0.000 2.5 0.0 9.23e-02 0.00e+00 38.644 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
264.4865 -27.0580 0.0407 16.3 87.1 0.2814 4.8 TRIG_00147919
------------------------------------------
Foreground time interval of the image:
0.000 33.059 (delta_t = 33.059 [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 33.059 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.30569 ( -0.984575 1.24464 )
Norm@50keV : 5.144741E-05 ( -5.144742E-05 8.889184E-05) )
------------------------------------------------------------
Chi-Squared = 39.46350 using 59 PHA bins.
Reduced chi-squared = 0.6923421 for 57 degrees of freedom
Null hypothesis probability = 0.963
Photon flux (15-150 keV) in 33.06 sec: 0.106558 ( -0.0250349 0.025154 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1021e-07 ( -2.9228e-08 3.14424e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.059 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51166 ( )
Epeak [keV] : 2.49035 ( )
Norm@50keV : 9.228950E-02 ( )
------------------------------------------------------------
Chi-Squared = 38.64356 using 59 PHA bins.
Reduced chi-squared = 0.6900635 for 56 degrees of freedom
Null hypothesis probability = 0.963
Photon flux (15-150 keV) in 33.06 sec: 0.106454 ( -0.025026 0.025144 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05585e-07 ( -2.5201e-08 2.65842e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.059 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.20720 ( -0.792798 2.05301 )
beta : -5.30466 ( -1.24796 0.984879 )
Epeak [keV] : 412.960 ( -412.860 9587.04 )
Norm@50keV : 6.999874E-03 ( -6.999874E-03 1.207931E-02) )
------------------------------------------------------------
Chi-Squared = 39.46349 using 59 PHA bins.
Reduced chi-squared = 0.7175180 for 55 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 33.06 sec: 0.106634 ( -0.0245061 0.02301 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13803e-07 ( -3.22619e-08 2.96056e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.059 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.30569 ( -0.984575 1.24464 )
Norm@50keV : 5.144741E-05 ( -5.144742E-05 8.889184E-05) )
------------------------------------------------------------
Chi-Squared = 39.46350 using 59 PHA bins.
Reduced chi-squared = 0.6923421 for 57 degrees of freedom
Null hypothesis probability = 0.963
Photon flux (15-150 keV) in 33.06 sec: 0.106558 ( -0.0250349 0.025154 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1021e-07 ( -2.9228e-08 3.14424e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.059 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51166 ( )
Epeak [keV] : 2.49035 ( )
Norm@50keV : 9.228950E-02 ( )
------------------------------------------------------------
Chi-Squared = 38.64356 using 59 PHA bins.
Reduced chi-squared = 0.6900635 for 56 degrees of freedom
Null hypothesis probability = 0.963
Photon flux (15-150 keV) in 33.06 sec: 0.106454 ( -0.025026 0.025144 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05585e-07 ( -2.5201e-08 2.65842e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.059 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.20720 ( -0.792798 7.45409 )
beta : -5.30466 ( -1.24796 0.984879 )
Epeak [keV] : 412.960 ( -412.860 9587.04 )
Norm@50keV : 6.999874E-03 ( -6.999874E-03 1.207931E-02) )
------------------------------------------------------------
Chi-Squared = 39.46349 using 59 PHA bins.
Reduced chi-squared = 0.7175180 for 55 degrees of freedom
Null hypothesis probability = 0.943
Photon flux (15-150 keV) in 33.06 sec: 0.106634 ( -0.0245061 0.02301 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13803e-07 ( -3.22619e-08 2.96056e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 14:12:34 EST 2008