batgrbproduct Analysis for Trigger=373792
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): Mon Oct 26 03:52:17 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373792/GCN5_download_cron
======================================================================
Trigger: 00373792 Segment: 000
BAT Trigger Time: 278180056 [s; MET]
Trigger Stop: 278180120 [s; MET]
UTC: 2009-10-25T16:14:10.797600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.053201463609 Dec: -22.374175893644 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.11
Flight Position: [ source = BAT ]
RA: 268.053201463609 Dec: -22.374175893644 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.033056443233 Dec: -22.3516558540291 [deg; J2000]
{ 17h 52m 07.9s , -22d 21' 06.0" }
+/- 2.88056331512097 [arcmin] (estimated 90% radius based on SNR)
+/- 1.68894292730546 [arcmin] (formal 1-sigma fit error)
SNR: 6.70999285666968
Angular difference between Flight and Ground position is 1.753630 arcmin
Partial Coding Fraction: 0.984375 [ 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 0.326484 0.367173 0.189657 0.078559
0.051458 0.049850 0.046238 0.049336 [error]
Peak 0.326484 0.367173 0.189657 0.078559
0.051458 0.049850 0.046238 0.049336 [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 8.61e-08 1.40e-07 1.72e-07 4.17e-07 5.16e-07 8.15e-07 erg/cm2
Error 2.21e-08 2.19e-08 4.72e-08 2.48e-07 1.06e-07 2.89e-07 erg/cm2
Peak flux Power-law 4.36e-02 3.89e-02 2.39e-02 2.23e-02 1.16e-01 1.29e-01 ph/cm2/s
Error 1.15e-02 6.13e-03 6.31e-03 1.22e-02 1.82e-02 2.13e-02 ph/cm2/s
Fluence Cutoff-PL 8.61e-08 1.40e-07 1.72e-07 4.13e-07 5.16e-07 8.11e-07 erg/cm2
Error 2.22e-08 2.19e-08 4.72e-08 2.45e-07 1.06e-07 2.87e-07 erg/cm2
Peak flux Cutoff-PL 4.35e-02 3.89e-02 2.39e-02 2.21e-02 1.16e-01 1.28e-01 ph/cm2/s
Error 1.15e-02 6.13e-03 6.31e-03 1.21e-02 1.82e-02 2.12e-02 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 1.702 0.337 - - 8.71e-04 1.66e-04 59.160 57
CPL 2.051 0.000 20.4 0.0 5.38e-04 0.00e+00 57.330 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.702 0.337 - - 8.71e-04 1.66e-04 59.160 57
CPL 2.051 0.000 20.4 0.0 5.38e-04 0.00e+00 57.330 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
268.0331 -22.3517 0.0287 11.4 134.9 1.0490 6.7 TRIG_00373792
------------------------------------------
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.
- 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70246 ( -0.327805 0.346738 )
Norm@50keV : 8.71295E-04 ( -0.000170724 0.000162013 )
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.967702e-01
Photon flux (15-150 keV) in 64 sec: 0.115819 ( -0.0181635 0.0181688 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16209e-07 ( -1.03648e-07 1.08378e-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: 2.05097 ( )
Epeak [keV] : 20.3522 ( )
Norm@50keV : 5.37875E-04 ( )
------------------------------------------------------------
# Chi-Squared = 57.33 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.257354e-01
Photon flux (15-150 keV) in 64 sec: 0.115765 ( -0.0181567 0.018162 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16035e-07 ( -1.0363e-07 1.08385e-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 : -1.42350 ( 1.4235 1.4235 )
beta : -1.70242 ( -0.347185 0.328235 )
Epeak [keV] : 9.74382 ( -9.74425 -9.74425 )
Norm@50keV : 2.22518E-03 ( -0.00222525 19663.1 )
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.263885e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70246 ( -0.327805 0.346738 )
Norm@50keV : 8.71295E-04 ( -0.000170724 0.000162013 )
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.967702e-01
Photon flux (15-150 keV) in 64 sec: 0.115819 ( -0.0181635 0.0181688 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16209e-07 ( -1.03648e-07 1.08378e-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: 2.05097 ( )
Epeak [keV] : 20.3522 ( )
Norm@50keV : 5.37875E-04 ( )
------------------------------------------------------------
# Chi-Squared = 57.33 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.257354e-01
Photon flux (15-150 keV) in 64 sec: 0.115765 ( -0.0181567 0.018162 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16035e-07 ( -1.0363e-07 1.08385e-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 : -1.42350 ( 1.4235 1.4235 )
beta : -1.70242 ( -0.347185 0.328235 )
Epeak [keV] : 9.74382 ( -9.74425 -9.74425 )
Norm@50keV : 2.22518E-03 ( -0.00222525 19663.1 )
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.263885e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Oct 26 04:03:01 EDT 2009