batgrbproduct Analysis for Trigger=358422
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 Jul 27 14:15:47 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358422/GCN5_download_cron
======================================================================
Trigger: 00358422 Segment: 000
BAT Trigger Time: 270340952.704 [s; MET]
Trigger Stop: 270340964.864 [s; MET]
UTC: 2009-07-26T22:42:27.759160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.818572808623 Dec: 72.8709899504922 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.07
Image Trigger?: NO
Rate S/N Ratio: 12.9614813968157 [ if not an image trigger ]
Image S/N Ratio: 11.07
Flight Position: [ source = BAT ]
RA: 248.818572808623 Dec: 72.8709899504922 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.672142091278 Dec: 72.8660877615832 [deg; J2000]
{ 16h 34m 41.3s , +72d 51' 57.9" }
+/- 1.67471063637264 [arcmin] (estimated 90% radius based on SNR)
+/- 0.738216546391998 [arcmin] (formal 1-sigma fit error)
SNR: 14.5614428665054
Angular difference between Flight and Ground position is 2.604663 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 59.3120000362396 +/- 15.4574575178678
Measured from: -17.0319998860359
to: 42.2800001502037 [s; relative to TRIGTIME]
T50: 20.8159999847412 +/- 10.2994896640971
Measured from: -2.27999985218048
to: 18.5360001325607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.66000002622604
to: 8.66000002622604 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.1679999828339
to: 54.3280000090599 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.688056 0.633892 0.234964 0.064247
0.049248 0.051397 0.047234 0.045930 [error]
Peak 0.022374 0.049093 0.019034 0.009630
0.006256 0.006613 0.005922 0.005494 [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 2.20e-07 2.56e-07 2.14e-07 3.01e-07 7.98e-07 9.91e-07 erg/cm2
Error 2.74e-08 2.54e-08 4.14e-08 1.12e-07 9.39e-08 1.64e-07 erg/cm2
Peak flux Power-law 3.08e-01 2.64e-01 1.54e-01 1.34e-01 7.84e-01 8.60e-01 ph/cm2/s
Error 8.38e-02 5.18e-02 4.51e-02 7.40e-02 1.54e-01 1.74e-01 ph/cm2/s
Fluence Cutoff-PL 2.08e-07 2.82e-07 1.91e-07 6.49e-08 7.27e-07 7.45e-07 erg/cm2
Error 3.06e-08 3.49e-08 5.21e-08 1.26e-07 1.04e-07 1.64e-07 erg/cm2
Peak flux Cutoff-PL 2.36e-01 3.73e-01 1.11e-01 2.75e-03 7.23e-01 7.23e-01 ph/cm2/s
Error 9.13e-02 8.19e-02 6.00e-02 1.60e-02 1.48e-01 1.48e-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 2.27e-01 6.98e-01 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 2.259 0.197 - - 1.16e-03 1.62e-04 56.150 57
CPL 1.345 0.858 27.3 0.0 4.16e-03 0.00e+00 52.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.775 0.325 - - 5.74e-03 1.32e-03 70.960 57
CPL -1.928 0.278 40.3 9.0 9.90e-01 0.00e+00 63.010 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 72.496 -18.168 54.328
T90 59.312 -17.032 42.280
T50 20.816 -2.280 18.536
Peak 1.000 7.660 8.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.6721 +72.8661 0.0132 28.5 -171.9 1.7260 14.6 TRIG_00358422
------------------------------------------
Foreground time interval of the image:
-18.168 54.328 (delta_t = 72.496 [sec])
Background time interval of the image:
-239.704 -133.824 (delta_t = 105.880 [sec])
-132.704 -18.168 (delta_t = 114.536 [sec])
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 -18.168 sec. to 54.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25909 ( -0.190515 0.203694 )
Norm@50keV : 1.16029E-03 ( -0.00016367 0.000161206 )
------------------------------------------------------------
# Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 0.9851 for 57 degrees of freedom
# Null hypothesis probability = 5.069984e-01
Photon flux (15-150 keV) in 72.5 sec: 0.198259 ( -0.0184884 0.0184891 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.98131e-07 ( -9.24911e-08 9.53027e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.168 sec. to 54.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34511 ( -1.04714 0.668715 )
Epeak [keV] : 27.3223 ( )
Norm@50keV : 4.16151E-03 ( )
------------------------------------------------------------
# Chi-Squared = 52.57 using 59 PHA bins.
# Reduced chi-squared = 0.9387 for 56 degrees of freedom
# Null hypothesis probability = 6.055141e-01
Photon flux (15-150 keV) in 72.5 sec: 0.191406 ( -0.019255 0.01934 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.27349e-07 ( -9.80925e-08 1.0999e-07 ) ergs/cm2
Band function
Time interval is from -18.168 sec. to 54.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29730 ( -0.477492 1.00707 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 28.4147 ( -8.8579 8.27584 )
Norm@50keV : 4.37594E-03 ( -0.00430047 0.0254729 )
------------------------------------------------------------
# Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9562 for 55 degrees of freedom
# Null hypothesis probability = 5.671414e-01
Photon flux (15-150 keV) in 72.5 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 7.656 sec. to 8.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77547 ( -0.314681 0.334722 )
Norm@50keV : 5.74336E-03 ( -0.00133271 0.00130615 )
------------------------------------------------------------
# Chi-Squared = 70.96 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.012084e-01
Photon flux (15-150 keV) in 1.008 sec: 0.783950 ( -0.15411 0.154112 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33407e-08 ( -1.23686e-08 1.28938e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.656 sec. to 8.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.92832 ( 1.61647 2.17244 )
Epeak [keV] : 40.3083 ( -6.58506 11.475 )
Norm@50keV : 0.989653 ( )
------------------------------------------------------------
# Chi-Squared = 63.01 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 56 degrees of freedom
# Null hypothesis probability = 2.423412e-01
Photon flux (15-150 keV) in 1.008 sec: 0.722785 ( -0.143975 0.152576 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06754e-08 ( -8.89338e-09 1.17912e-08 ) ergs/cm2
Band function
Time interval is from 7.656 sec. to 8.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.39830 ( -5.67534 -5.06838 )
beta : -3.00209 ( 3.00213 0.93034 )
Epeak [keV] : 34.9527 ( -6.49067 8.14405 )
Norm@50keV : 50.4841 ( -50.5147 10.9824 )
------------------------------------------------------------
# Chi-Squared = 62.25 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.339092e-01
Photon flux (15-150 keV) in 1.008 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Jul 27 15:00:43 EDT 2009