batgrbproduct Analysis for Trigger=351020
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 v2.44
Process Start Time (local time): Sat May 2 05:29:38 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351020/GCN5_download_cron
======================================================================
Trigger: 00351020 Segment: 000
BAT Trigger Time: 262898400.896 [s; MET]
Trigger Stop: 262898401.92 [s; MET]
UTC: 2009-05-01T19:19:56.190500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 98.0286206367894 Dec: 0.364908315041211 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.88
Image Trigger?: NO
Rate S/N Ratio: 6.78232998312527 [ if not an image trigger ]
Image S/N Ratio: 5.88
Flight Position: [ source = BAT ]
RA: 98.0286206367894 Dec: 0.364908315041211 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.0605820620124 Dec: 0.336020697891776 [deg; J2000]
{ 06h 32m 14.5s , +00d 20' 09.7" }
+/- 3.85978216324249 [arcmin] (estimated 90% radius based on SNR)
+/- 2.78574187667216 [arcmin] (formal 1-sigma fit error)
SNR: 4.41744885758974
Angular difference between Flight and Ground position is 2.584871 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000624 0.008735 0.022359 0.017237
0.005813 0.005879 0.005569 0.005593 [error]
Peak -0.000624 0.008735 0.022359 0.017237
0.005813 0.005879 0.005569 0.005593 [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 5.09e-10 2.81e-09 1.34e-08 2.71e-07 4.22e-08 3.33e-07 erg/cm2
Error 7.99e-10 2.78e-09 9.31e-09 3.35e-07 1.46e-08 4.30e-07 erg/cm2
Peak flux Power-law 1.54e-02 4.52e-02 1.08e-01 7.14e-01 2.93e-01 8.83e-01 ph/cm2/s
Error 2.46e-02 4.59e-02 7.57e-02 8.32e-01 1.15e-01 7.71e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-10 2.07e-09 1.58e-08 6.85e-08 4.24e-08 9.12e-08 erg/cm2
Error 7.19e-10 2.18e-09 6.78e-09 4.04e-07 1.51e-08 3.94e-07 erg/cm2
Peak flux Cutoff-PL 1.53e-02 4.52e-02 1.08e-01 7.11e-01 2.93e-01 8.79e-01 ph/cm2/s
Error 2.45e-02 4.59e-02 7.57e-02 7.11e-01 1.14e-01 8.37e-01 ph/cm2/s
Fluence Band 1.05e-10 1.81e-09 1.55e-08 1.64e-07 4.20e-08 1.61e-07 erg/cm2
Error 6.81e-09 2.88e-07 1.45e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.97e-03 2.84e-02 1.27e-01 4.39e-01 2.73e-01 3.83e-01 ph/cm2/s
Error 2.08e-02 5.58e-02 7.23e-01 1.03e-01 8.65e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.260 1.508 - - 1.96e-03 1.63e-03 44.405 57
CPL -2.493 0.000 167.0 149.6 7.15e-03 1.76e-02 43.843 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.260 1.508 - - 1.96e-03 1.63e-03 44.405 57
CPL -2.493 0.000 167.0 149.6 7.15e-03 1.76e-02 43.843 0
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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.0606 +0.3360 0.0437 13.1 67.9 0.0539 4.4 TRIG_00351020
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-33.495 -8.896 (delta_t = 24.599 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.259508 ( -2.20057 0.814834 )
Norm@50keV : 1.955137E-03 ( -1.955137E-03 1.305749E-03) )
------------------------------------------------------------
Chi-Squared = 44.40517 using 59 PHA bins.
Reduced chi-squared = 0.7790381 for 57 degrees of freedom
Null hypothesis probability = 0.888
Photon flux (15-150 keV) in 1.024 sec: 0.292631 ( -0.112925 0.117343 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2241e-08 ( -1.46006e-08 1.46066e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49314 ( )
Epeak [keV] : 166.974 ( -152.888 146.226 )
Norm@50keV : 7.149448E-03 ( -9.238519E-03 2.588094E-02) )
------------------------------------------------------------
Chi-Squared = 43.84264 using 59 PHA bins.
but latest trial 296.696 gives Chi-Squared = 0.321678
Reduced chi-squared = 0.7829043 for 56 degrees of freedom
Null hypothesis probability = 0.881
Photon flux (15-150 keV) in 1.024 sec: 0.292688 ( -0.111791 0.117197 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24153e-08 ( -1.50934e-08 1.50892e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.358471 ( -9.64153 5.35847 )
beta : 0.259474 ( -0.814803 1.97293 )
Epeak [keV] : 20.3228 ( -20.2228 9979.68 )
Norm@50keV : 2.907905E-03 ( -2.907905E-03 4814.91 )
------------------------------------------------------------
Chi-Squared = 44.40517 using 59 PHA bins.
Reduced chi-squared = 0.8073668 for 55 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 1.024 sec: 0.272510 ( -0.092567 0.112692 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2e-08 ( -1.4661e-08 1.42581e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.259508 ( -2.20057 0.814834 )
Norm@50keV : 1.955137E-03 ( -1.955137E-03 1.305749E-03) )
------------------------------------------------------------
Chi-Squared = 44.40517 using 59 PHA bins.
Reduced chi-squared = 0.7790381 for 57 degrees of freedom
Null hypothesis probability = 0.888
Photon flux (15-150 keV) in 1.024 sec: 0.292631 ( -0.112925 0.117343 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2241e-08 ( -1.46006e-08 1.46066e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49314 ( )
Epeak [keV] : 166.974 ( -152.888 146.226 )
Norm@50keV : 7.149448E-03 ( -9.238519E-03 2.588094E-02) )
------------------------------------------------------------
Chi-Squared = 43.84264 using 59 PHA bins.
but latest trial 296.696 gives Chi-Squared = 0.321678
Reduced chi-squared = 0.7829043 for 56 degrees of freedom
Null hypothesis probability = 0.881
Photon flux (15-150 keV) in 1.024 sec: 0.292688 ( -0.111791 0.117197 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24153e-08 ( -1.50934e-08 1.50892e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.358471 ( -9.64153 5.35847 )
beta : 0.259474 ( -0.814803 1.97293 )
Epeak [keV] : 20.3228 ( -20.2228 9979.68 )
Norm@50keV : 2.907905E-03 ( -2.907905E-03 4814.91 )
------------------------------------------------------------
Chi-Squared = 44.40517 using 59 PHA bins.
Reduced chi-squared = 0.8073668 for 55 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 1.024 sec: 0.272510 ( -0.092567 0.112692 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2e-08 ( -1.4661e-08 1.42581e-08 ) ergs/cm2
Plot creation:
Sat May 2 05:44:13 EDT 2009