batgrbproduct Analysis for Trigger=324329
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 v2.41
Process Start Time (local time): Wed Sep 10 11:28:31 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger324329/GCN5_download_cron
======================================================================
Trigger: 00324329 Segment: 000
BAT Trigger Time: 242706136 [s; MET]
Trigger Stop: 242706200 [s; MET]
UTC: 2008-09-10T02:22:12.914240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.021478753765 Dec: -47.8800195724551 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.06
Flight Position: [ source = BAT ]
RA: 248.021478753765 Dec: -47.8800195724551 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.055850812065 Dec: -47.8433467695446 [deg; J2000]
{ 16h 32m 13.4s , -47d 50' 36.0" }
+/- 3.10769074350162 [arcmin] (estimated 90% radius based on SNR)
+/- 1.77180318682744 [arcmin] (formal 1-sigma fit error)
SNR: 6.02054513852462
Angular difference between Flight and Ground position is 2.599256 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 511.904000014067 +/- 148.797783900627
Measured from: -25.3239999115467
to: 486.58000010252 [s; relative to TRIGTIME]
T50: 207.023999989033 +/- 103.240685672093
Measured from: 130.312000095844
to: 337.336000084877 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 262.696000009775
to: 263.696000009775 [s; relative to TRIGTIME]
Total Fluence
Measured from: -58.0239999890327
to: 667.036000013351 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.006861 2.123730 0.043492 -0.075554
0.160739 0.153171 0.133366 0.121240 [error]
Peak 0.024744 0.010248 0.010564 0.002100
0.006193 0.006042 0.005346 0.004886 [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 1.17e-06 8.19e-07 3.78e-07 2.44e-07 2.48e-06 2.61e-06 erg/cm2
Error 1.01e-07 7.92e-08 7.55e-08 8.63e-08 2.13e-07 2.49e-07 erg/cm2
Peak flux Power-law 1.93e-01 1.19e-01 4.67e-02 2.47e-02 3.71e-01 3.83e-01 ph/cm2/s
Error 8.22e-02 4.90e-02 3.61e-02 3.99e-02 1.35e-01 1.44e-01 ph/cm2/s
Fluence Cutoff-PL 1.15e-06 8.91e-07 4.69e-08 2.40e-11 2.09e-06 2.09e-06 erg/cm2
Error 1.14e-07 1.07e-07 3.39e-08 2.39e-10 1.70e-07 1.70e-07 erg/cm2
Peak flux Cutoff-PL 1.92e-01 1.27e-01 3.99e-02 7.02e-03 3.64e-01 3.65e-01 ph/cm2/s
Error 1.04e-01 9.43e-02 4.30e-02 3.83e-02 1.77e-01 1.49e-01 ph/cm2/s
Fluence Band 1.12e-06 8.83e-07 1.49e-07 3.40e-09 2.24e-06 2.70e-06 erg/cm2
Error 8.92e-08 3.87e-08 1.69e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.92e-01 1.27e-01 3.95e-02 6.71e-03 3.64e-01 3.65e-01 ph/cm2/s
Error 8.76e-02 5.90e-02 4.31e-02 3.83e-02 1.36e-01 1.47e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.115 0.179 - - 2.72e-04 4.09e-05 111.219 57
CPL -1.626 1.363 20.9 2.4 7.25e-01 0.00e+00 69.237 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.343 0.809 - - 2.07e-03 1.66e-03 71.432 57
CPL 1.729 0.000 14.3 15.1 5.41e-03 4.36e+01 71.247 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 725.060 -58.024 667.036
T90 511.904 -25.324 486.580
T50 207.024 130.312 337.336
Peak 1.000 262.696 263.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.0559 -47.8433 0.0320 9.1 20.8 1.2583 6.0 TRIG_00324329
------------------------------------------
Foreground time interval of the image:
-58.024 163.701 (delta_t = 221.725 [sec])
Background time interval of the image:
-239.000 -58.024 (delta_t = 180.976 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
-58.024000 600.300000
601.000000 624.090000
625.000000 630.750000
632.000000 646.340000
648.000000 649.000000
650.000000 667.036000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.11492 ( -0.174853 0.184081 )
Norm@50keV : 2.718222E-04 ( -4.017027E-05 4.172203E-05) )
------------------------------------------------------------
Chi-Squared = 111.2186 using 59 PHA bins.
Reduced chi-squared = 1.951203 for 57 degrees of freedom
Null hypothesis probability = 2.318E-05
Photon flux (15-150 keV) in 719.5 sec: 8.136911E-02 ( -0.00609999 0.00610117 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48292e-06 ( -2.10972e-07 2.15145e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-58.024000 600.300000
601.000000 624.090000
625.000000 630.750000
632.000000 646.340000
648.000000 649.000000
650.000000 667.036000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.62565 ( -1.37435 1.35122 )
Epeak [keV] : 20.8680 ( -2.56350 2.14142 )
Norm@50keV : 0.725285 ( )
------------------------------------------------------------
Chi-Squared = 69.23713 using 59 PHA bins.
Reduced chi-squared = 1.236377 for 56 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 719.5 sec: 8.133637E-02 ( -0.0060979 0.00609864 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09249e-06 ( -1.64873e-07 1.75407e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-58.024000 600.300000
601.000000 624.090000
625.000000 630.750000
632.000000 646.340000
648.000000 649.000000
650.000000 667.036000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39797 ( -0.144068 9.300709E-02) )
beta : -9.31064 ( -0.689360 5.30900 )
Epeak [keV] : 9.14142 ( -3.80050 1.93041 )
Norm@50keV : 5.290462E-03 ( -1.21661 60.9421 )
------------------------------------------------------------
Chi-Squared = 83.52235 using 59 PHA bins.
Reduced chi-squared = 1.518588 for 55 degrees of freedom
Null hypothesis probability = 7.848E-03
Photon flux (15-150 keV) in 719.5 sec: 8.183798E-02 ( -0.00601303 0.00616177 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23702e-06 ( -1.62801e-07 1.75673e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 262.696 sec. to 263.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34300 ( -0.695851 0.922284 )
Norm@50keV : 2.071423E-03 ( -2.071423E-03 1.256116E-03) )
------------------------------------------------------------
Chi-Squared = 71.43177 using 59 PHA bins.
Reduced chi-squared = 1.253189 for 57 degrees of freedom
Null hypothesis probability = 9.456E-02
Photon flux (15-150 keV) in 1.000 sec: 0.370883 ( -0.134576 0.135281 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99374e-08 ( -9.0266e-09 1.06426e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 262.696 sec. to 263.696 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72883 ( )
Epeak [keV] : 14.3016 ( -22.2416 7.90331 )
Norm@50keV : 5.411257E-03 ( -17.4963 69.7175 )
------------------------------------------------------------
Chi-Squared = 71.24708 using 59 PHA bins.
but latest trial 4.78577 gives Chi-Squared = 0.242485
Reduced chi-squared = 1.272269 for 56 degrees of freedom
Null hypothesis probability = 8.239E-02
Photon flux (15-150 keV) in 1.000 sec: 0.364386 ( -0.15115 0.203529 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27467e-08 ( -4.84494e-09 1.71722e-08 ) ergs/cm2
Band function
Time interval is from 262.696 sec. to 263.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59206 ( -14.9935 6.470203E-03) )
beta : -9.20244 ( -2.05992 0.836798 )
Epeak [keV] : 17.0251 ( -14.7619 4.30440 )
Norm@50keV : 6.815627E-03 ( -164.265 575.162 )
------------------------------------------------------------
Chi-Squared = 71.25096 using 59 PHA bins.
Reduced chi-squared = 1.295472 for 55 degrees of freedom
Null hypothesis probability = 6.931E-02
Photon flux (15-150 keV) in 1.000 sec: 0.364045 ( -0.134395 0.137328 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86731e-08 ( -9.05203e-09 5.5537e-09 ) ergs/cm2
Plot creation:
Wed Sep 10 11:43:00 EDT 2008