batgrbproduct Analysis for Trigger=374869
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 v2.45
Process Start Time (local time): Wed Nov 4 21:20:56 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger374869/GCN5_download_cron
======================================================================
Trigger: 00374869 Segment: 000
BAT Trigger Time: 279012256 [s; MET]
Trigger Stop: 279012576 [s; MET]
UTC: 2009-11-04T07:24:10.769860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.665356735406 Dec: -17.0892267689427 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.34
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.34
Flight Position: [ source = BAT ]
RA: 274.665356735406 Dec: -17.0892267689427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.656162495532 Dec: -17.0662871571381 [deg; J2000]
{ 18h 18m 37.5s , -17d 03' 58.6" }
+/- 2.98604168327142 [arcmin] (estimated 90% radius based on SNR)
+/- 2.00407044796246 [arcmin] (formal 1-sigma fit error)
SNR: 6.37396978045781
Angular difference between Flight and Ground position is 1.473937 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.949675 0.638084 0.049945 0.155380
0.102607 0.098379 0.083660 0.072800 [error]
Peak 0.949675 0.638084 0.049945 0.155380
0.102607 0.098379 0.083660 0.072800 [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 2.55e-07 2.42e-07 1.60e-07 1.64e-07 7.23e-07 8.21e-07 erg/cm2
Error 4.59e-08 4.66e-08 6.09e-08 1.15e-07 1.49e-07 2.15e-07 erg/cm2
Peak flux Power-law 2.63e-02 1.39e-02 4.61e-03 1.97e-03 4.59e-02 4.68e-02 ph/cm2/s
Error 4.83e-03 2.58e-03 1.70e-03 1.77e-03 7.23e-03 7.48e-03 ph/cm2/s
Fluence Cutoff-PL 2.48e-07 2.95e-07 5.13e-08 4.56e-10 5.95e-07 5.95e-07 erg/cm2
Error 5.17e-08 6.51e-08 6.56e-08 9.53e-09 1.12e-07 1.12e-07 erg/cm2
Peak flux Cutoff-PL 2.49e-02 1.73e-02 1.69e-03 8.16e-06 4.39e-02 4.39e-02 ph/cm2/s
Error 5.46e-03 3.67e-03 1.99e-03 1.53e-04 6.94e-03 6.94e-03 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.597 0.348 - - 2.20e-04 6.25e-05 64.840 57
CPL 2.558 0.351 9999.4 0.0 2.26e-04 0.00e+00 64.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.597 0.348 - - 2.20e-04 6.25e-05 64.840 57
CPL 2.558 0.351 9999.4 0.0 2.26e-04 0.00e+00 64.880 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.6562 -17.0663 0.0301 14.8 -144.5 1.6203 6.4 TRIG_00374869
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59720 ( -0.325381 0.370683 )
Norm@50keV : 2.19791E-04 ( -6.16554e-05 6.33228e-05 )
------------------------------------------------------------
# Chi-Squared = 64.84 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.222259e-01
Photon flux (15-150 keV) in 320 sec: 4.58817E-02 ( -0.00722934 0.00723853 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.2329e-07 ( -1.43784e-07 1.5343e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55824 ( -0.289342 0.413195 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.25710E-04 ( )
------------------------------------------------------------
# Chi-Squared = 64.88 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 56 degrees of freedom
# Null hypothesis probability = 1.946162e-01
Photon flux (15-150 keV) in 320 sec: 4.39275E-02 ( -0.0069195 0.0069684 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94861e-07 ( -1.04352e-07 1.19466e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.02264 ( -2.31294 3.0326 )
beta : -5.42677 ( 5.15014 2.24664 )
Epeak [keV] : 25.4520 ( -5.02931 4.28173 )
Norm@50keV : 6.69810E-02 ( -0.068108 5.86403 )
------------------------------------------------------------
# Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.653042e-01
Photon flux (15-150 keV) in 320 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59720 ( -0.325381 0.370683 )
Norm@50keV : 2.19791E-04 ( -6.16554e-05 6.33228e-05 )
------------------------------------------------------------
# Chi-Squared = 64.84 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.222259e-01
Photon flux (15-150 keV) in 320 sec: 4.58817E-02 ( -0.00722934 0.00723853 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.2329e-07 ( -1.43784e-07 1.5343e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55824 ( -0.289342 0.413195 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.25710E-04 ( )
------------------------------------------------------------
# Chi-Squared = 64.88 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 56 degrees of freedom
# Null hypothesis probability = 1.946162e-01
Photon flux (15-150 keV) in 320 sec: 4.39275E-02 ( -0.0069195 0.0069684 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94861e-07 ( -1.04352e-07 1.19466e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.02264 ( -2.31294 3.0326 )
beta : -5.42677 ( 5.15014 2.24664 )
Epeak [keV] : 25.4520 ( -5.00611 4.28173 )
Norm@50keV : 6.69810E-02 ( -0.068108 5.86403 )
------------------------------------------------------------
# Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.653042e-01
Photon flux (15-150 keV) in 320 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Nov 4 21:39:04 EST 2009