batgrbproduct Analysis for Trigger=373679
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): Sat Oct 24 17:49:10 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373679/GCN5_download_cron
======================================================================
Trigger: 00373679 Segment: 000
BAT Trigger Time: 278076344 [s; MET]
Trigger Stop: 278076408 [s; MET]
UTC: 2009-10-24T11:25:38.801040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 300.630369870914 Dec: 34.8540083617864 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.11
Flight Position: [ source = BAT ]
RA: 300.630369870914 Dec: 34.8540083617864 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 300.62204285163 Dec: 34.8524745639275 [deg; J2000]
{ 20h 02m 29.3s , +34d 51' 08.9" }
+/- 1.66720430369253 [arcmin] (estimated 90% radius based on SNR)
+/- 0.629235671437416 [arcmin] (formal 1-sigma fit error)
SNR: 14.6551912522404
Angular difference between Flight and Ground position is 0.420200 arcmin
Partial Coding Fraction: 0.59375 [ 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 0.454323 0.666454 0.390380 0.104431
0.051226 0.053745 0.049192 0.045695 [error]
Peak 0.454323 0.666454 0.390380 0.104431
0.051226 0.053745 0.049192 0.045695 [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 1.63e-07 2.68e-07 3.34e-07 8.28e-07 9.98e-07 1.59e-06 erg/cm2
Error 2.37e-08 2.60e-08 4.75e-08 2.38e-07 1.13e-07 2.84e-07 erg/cm2
Peak flux Power-law 8.24e-02 7.45e-02 4.65e-02 4.42e-02 2.22e-01 2.48e-01 ph/cm2/s
Error 1.22e-02 7.29e-03 6.39e-03 1.18e-02 2.16e-02 2.44e-02 ph/cm2/s
Fluence Cutoff-PL 1.46e-07 3.05e-07 3.25e-07 1.68e-07 9.45e-07 0.00e+00 erg/cm2
Error 2.71e-08 3.76e-08 5.93e-08 2.49e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.30e-02 8.42e-02 4.64e-02 1.22e-02 2.13e-01 2.16e-01 ph/cm2/s
Error 1.41e-02 1.02e-02 7.77e-03 1.24e-02 2.24e-02 2.52e-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 1.682 0.165 - - 1.68e-03 1.80e-04 56.730 57
CPL 0.584 0.886 55.7 22.7 6.98e-03 1.27e-02 50.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.682 0.165 - - 1.68e-03 1.80e-04 56.730 57
CPL 0.584 0.886 55.7 22.7 6.98e-03 1.27e-02 50.560 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
300.6220 +34.8525 0.0131 34.0 -142.7 1.6330 14.7 TRIG_00373679
------------------------------------------
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: 1.68177 ( -0.163158 0.167072 )
Norm@50keV : 1.68232E-03 ( -0.000180677 0.000178644 )
------------------------------------------------------------
# Chi-Squared = 56.73 using 59 PHA bins.
# Reduced chi-squared = 0.9953 for 57 degrees of freedom
# Null hypothesis probability = 4.849937e-01
Photon flux (15-150 keV) in 64 sec: 0.222027 ( -0.0215619 0.0215713 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98394e-07 ( -1.1242e-07 1.14172e-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: 0.583963 ( -0.98965 0.782405 )
Epeak [keV] : 55.7265 ( -10.5253 34.9264 )
Norm@50keV : 6.98161E-03 ( -0.00699346 0.0184609 )
------------------------------------------------------------
# Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.9028 for 56 degrees of freedom
# Null hypothesis probability = 6.802311e-01
Photon flux (15-150 keV) in 64 sec: 0.213024 ( -0.022438 0.022459 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 2.27474 ( -3.15292 -2.14486 )
beta : -2.04517 ( 2.04517 0.318623 )
Epeak [keV] : 32.9834 ( -9.00799 31.8354 )
Norm@50keV : 0.766720 ( -0.768333 34.1735 )
------------------------------------------------------------
# Chi-Squared = 48.36 using 59 PHA bins.
# Reduced chi-squared = 0.8792 for 55 degrees of freedom
# Null hypothesis probability = 7.246097e-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: 1.68177 ( -0.163158 0.167072 )
Norm@50keV : 1.68232E-03 ( -0.000180677 0.000178644 )
------------------------------------------------------------
# Chi-Squared = 56.73 using 59 PHA bins.
# Reduced chi-squared = 0.9953 for 57 degrees of freedom
# Null hypothesis probability = 4.849937e-01
Photon flux (15-150 keV) in 64 sec: 0.222027 ( -0.0215619 0.0215713 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.98394e-07 ( -1.1242e-07 1.14172e-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: 0.583963 ( -0.98965 0.782405 )
Epeak [keV] : 55.7265 ( -10.5253 34.9264 )
Norm@50keV : 6.98161E-03 ( -0.00699346 0.0184609 )
------------------------------------------------------------
# Chi-Squared = 50.56 using 59 PHA bins.
# Reduced chi-squared = 0.9028 for 56 degrees of freedom
# Null hypothesis probability = 6.802311e-01
Photon flux (15-150 keV) in 64 sec: 0.213024 ( -0.022438 0.022459 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 2.27474 ( -3.15292 -2.14486 )
beta : -2.04517 ( 2.04517 0.318623 )
Epeak [keV] : 32.9834 ( -9.00799 31.8354 )
Norm@50keV : 0.766720 ( -0.768333 34.1735 )
------------------------------------------------------------
# Chi-Squared = 48.36 using 59 PHA bins.
# Reduced chi-squared = 0.8792 for 55 degrees of freedom
# Null hypothesis probability = 7.246097e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Oct 24 18:03:24 EDT 2009