batgrbproduct Analysis for Trigger=358357
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): Sun Jul 26 11:29:57 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358357/GCN5_download_cron
======================================================================
Trigger: 00358357 Segment: 000
BAT Trigger Time: 270279864 [s; MET]
Trigger Stop: 270279928 [s; MET]
UTC: 2009-07-26T05:44:19.057140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 302.436151094522 Dec: 32.8515558593972 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.09
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.09
Flight Position: [ source = BAT ]
RA: 302.436151094522 Dec: 32.8515558593972 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 302.433406575329 Dec: 32.8461279176634 [deg; J2000]
{ 20h 09m 44.0s , +32d 50' 46.1" }
+/- 1.4319296841458 [arcmin] (estimated 90% radius based on SNR)
+/- 0.538976264545507 [arcmin] (formal 1-sigma fit error)
SNR: 18.2126484815055
Angular difference between Flight and Ground position is 0.353841 arcmin
Partial Coding Fraction: 0.1992188 [ including projection effects ]
Duration
T90: 125.955999910831 +/- 40.0998657805491
Measured from: 5.51200014352798
to: 131.468000054359 [s; relative to TRIGTIME]
T50: 62.2239999175072 +/- 24.5614645399759
Measured from: 10.7120001316071
to: 72.9360000491142 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.7760000228882
to: 27.7760000228882 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.93999999761581
to: 141.907999992371 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.914003 2.296543 1.654828 0.312575
0.153754 0.159268 0.142245 0.126006 [error]
Peak 0.034856 0.033941 0.027256 0.023341
0.012930 0.013500 0.012072 0.011368 [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 7.02e-07 1.07e-06 1.23e-06 2.70e-06 3.81e-06 5.70e-06 erg/cm2
Error 8.46e-08 8.23e-08 1.42e-07 6.40e-07 3.31e-07 7.70e-07 erg/cm2
Peak flux Power-law 3.82e-01 2.41e-01 9.78e-02 5.38e-02 7.48e-01 7.74e-01 ph/cm2/s
Error 2.17e-01 1.17e-01 8.19e-02 9.62e-02 3.42e-01 3.57e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 3.59e-01 3.35e-01 3.08e-02 6.30e-05 7.25e-01 7.24e-01 ph/cm2/s
Error 2.13e-01 1.65e-01 7.21e-02 5.50e-02 3.09e-01 3.09e-01 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 1.803 0.139 - - 2.74e-03 2.33e-04 42.860 57
CPL 1.460 0.388 72.8 -25.0 4.18e-03 2.59e-03 41.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.300 0.971 - - 4.28e-03 3.55e-03 70.430 57
CPL -4.919 0.000 29.9 8.3 3.08e+02 2.23e+02 68.350 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 150.848 -8.940 141.908
T90 125.956 5.512 131.468
T50 62.224 10.712 72.936
Peak 1.000 26.776 27.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
302.4334 +32.8461 0.0106 40.8 43.0 6.1165 18.2 TRIG_00358357
------------------------------------------
Foreground time interval of the image:
-7.899 132.901 (delta_t = 140.800 [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 -8.940 sec. to 141.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80338 ( -0.137478 0.140661 )
Norm@50keV : 2.74266E-03 ( -0.00023417 0.000231321 )
------------------------------------------------------------
# Chi-Squared = 42.86 using 59 PHA bins.
# Reduced chi-squared = 0.7519 for 57 degrees of freedom
# Null hypothesis probability = 9.176684e-01
Photon flux (15-150 keV) in 150.8 sec: 0.378429 ( -0.0294308 0.0294657 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80711e-06 ( -3.2956e-07 3.32645e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.940 sec. to 141.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46037 ( -0.500758 0.275689 )
Epeak [keV] : 72.7610 ( -23.4946 -73.5285 )
Norm@50keV : 4.18479E-03 ( -0.00164628 0.00353094 )
------------------------------------------------------------
# Chi-Squared = 41.95 using 59 PHA bins.
# Reduced chi-squared = 0.7491 for 56 degrees of freedom
# Null hypothesis probability = 9.183661e-01
Photon flux (15-150 keV) in 150.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -8.940 sec. to 141.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50123 ( 1.50123 0.414501 )
beta : -9.35509 ( 9.86798 19.868 )
Epeak [keV] : 76.6037 ( -26.2361 116.136 )
Norm@50keV : 3.98292E-03 ( -0.000302406 0.00193806 )
------------------------------------------------------------
# Chi-Squared = 41.91 using 59 PHA bins.
# Reduced chi-squared = 0.7620 for 55 degrees of freedom
# Null hypothesis probability = 9.029162e-01
Photon flux (15-150 keV) in 150.8 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 26.776 sec. to 27.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29995 ( -0.834838 1.10695 )
Norm@50keV : 4.27961E-03 ( -0.00428017 0.00282676 )
------------------------------------------------------------
# Chi-Squared = 70.43 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 57 degrees of freedom
# Null hypothesis probability = 1.088921e-01
Photon flux (15-150 keV) in 1 sec: 0.747967 ( -0.341453 0.341593 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09024e-08 ( -2.15248e-08 2.44352e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.91886 ( )
Epeak [keV] : 29.8727 ( -7.67636 9.00182 )
Norm@50keV : 307.960 ( -307.95 138.487 )
------------------------------------------------------------
# Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 56 degrees of freedom
# Null hypothesis probability = 1.245921e-01
Photon flux (15-150 keV) in 1 sec: 0.724580 ( -0.308145 0.31052 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.56107 ( -6.27424 -6.27424 )
beta : -9.64413 ( 13.9073 23.9062 )
Epeak [keV] : 29.6678 ( -29.8359 9.1678 )
Norm@50keV : 187.910 ( -178.14 113.442 )
------------------------------------------------------------
# Chi-Squared = 68.34 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.067665e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Jul 26 11:57:17 EDT 2009