batgrbproduct Analysis for Trigger=324805
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): Tue Sep 16 03:50:35 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger324805/GCN5_download_cron
======================================================================
Trigger: 00324805 Segment: 000
BAT Trigger Time: 243186818.24 [s; MET]
Trigger Stop: 243186818.368 [s; MET]
UTC: 2008-09-15T15:53:35.140100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 213.078560327715 Dec: -11.4732707538459 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.57
Image Trigger?: NO
Rate S/N Ratio: 23.473389188611 [ if not an image trigger ]
Image S/N Ratio: 10.57
Flight Position: [ source = BAT ]
RA: 213.078560327715 Dec: -11.4732707538459 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 213.08875083567 Dec: -11.4909955964797 [deg; J2000]
{ 14h 12m 21.3s , -11d 29' 27.6" }
+/- 0.779112896949392 [arcmin] (estimated 90% radius based on SNR)
+/- 0.278910439793421 [arcmin] (formal 1-sigma fit error)
SNR: 43.4485173229367
Angular difference between Flight and Ground position is 1.220674 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 3.77599999308586 +/- 0.71554177679034
Measured from: -0.207999914884567
to: 3.56800007820129 [s; relative to TRIGTIME]
T50: 1.08799999952316 +/- 0.0640000104904175
Measured from: 0.368000090122223
to: 1.45600008964539 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.15599998831749
to: 1.15599998831749 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.527999997138977
to: 6.12799999117851 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.675006 0.744275 0.388604 0.037597
0.020198 0.021352 0.020214 0.021045 [error]
Peak 0.279329 0.372017 0.224084 0.045594
0.009848 0.010818 0.009658 0.008531 [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 2.38e-07 3.18e-07 3.12e-07 5.50e-07 1.05e-06 1.40e-06 erg/cm2
Error 1.53e-08 1.24e-08 2.05e-08 7.52e-08 4.57e-08 9.60e-08 erg/cm2
Peak flux Power-law 3.42e+00 2.88e+00 1.65e+00 1.40e+00 8.57e+00 9.36e+00 ph/cm2/s
Error 2.21e-01 1.14e-01 8.77e-02 1.51e-01 3.40e-01 3.54e-01 ph/cm2/s
Fluence Cutoff-PL 2.20e-07 3.33e-07 3.06e-07 2.34e-07 9.87e-07 1.12e-06 erg/cm2
Error 1.84e-08 1.55e-08 2.26e-08 1.19e-07 5.69e-08 1.38e-07 erg/cm2
Peak flux Cutoff-PL 3.05e+00 3.05e+00 1.69e+00 6.72e-01 8.23e+00 8.46e+00 ph/cm2/s
Error 2.70e-01 1.38e-01 9.69e-02 2.20e-01 3.68e-01 4.41e-01 ph/cm2/s
Fluence Band 2.18e-07 3.32e-07 3.06e-07 2.35e-07 9.86e-07 1.25e-06 erg/cm2
Error 1.82e-08 1.54e-08 2.26e-08 1.19e-07 5.68e-08 0.00e+00 erg/cm2
Peak flux Band 2.93e+00 3.13e+00 1.62e+00 1.04e+00 8.18e+00 8.72e+00 ph/cm2/s
Error 3.05e-01 1.58e-01 9.60e-02 2.82e-01 3.71e-01 4.36e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.026 0.081 - - 1.70e-02 7.88e-04 62.359 57
CPL 1.482 0.349 42.0 9.1 3.36e-02 1.52e-02 54.223 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.804 0.070 - - 6.21e-02 2.53e-03 56.331 57
CPL 1.131 0.323 60.9 10.8 1.39e-01 5.55e-02 41.571 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.656 -0.528 6.128
T90 3.776 -0.208 3.568
T50 1.088 0.368 1.456
Peak 1.000 0.156 1.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
213.0888 -11.4910 0.0044 32.3 -26.1 1.9467 43.4 TRIG_00324805
------------------------------------------
Foreground time interval of the image:
-0.528 6.128 (delta_t = 6.656 [sec])
Background time interval of the image:
-60.240 -27.827 (delta_t = 32.413 [sec])
-27.240 -0.528 (delta_t = 26.712 [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 -0.528 sec. to 6.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02646 ( -7.986009E-02 8.120489E-02) )
Norm@50keV : 1.703239E-02 ( -7.908642E-04 7.846020E-04) )
------------------------------------------------------------
Chi-Squared = 62.35852 using 59 PHA bins.
Reduced chi-squared = 1.094009 for 57 degrees of freedom
Null hypothesis probability = 0.292
Photon flux (15-150 keV) in 6.656 sec: 2.58645 ( -0.10531 0.10558 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04718e-06 ( -4.55803e-08 4.57999e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.528 sec. to 6.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48188 ( -0.363519 0.334305 )
Epeak [keV] : 42.0118 ( -9.83252 8.36336 )
Norm@50keV : 3.362820E-02 ( -1.127011E-02 1.910666E-02) )
------------------------------------------------------------
Chi-Squared = 54.22279 using 59 PHA bins.
Reduced chi-squared = 0.9682641 for 56 degrees of freedom
Null hypothesis probability = 0.542
Photon flux (15-150 keV) in 6.656 sec: 2.48862 ( -0.11923 0.11941 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.87211e-07 ( -5.66559e-08 5.70619e-08 ) ergs/cm2
Band function
Time interval is from -0.528 sec. to 6.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48165 ( -0.334513 0.363882 )
beta : -9.06844 ( -0.931564 6.98373 )
Epeak [keV] : 41.9983 ( -9.82960 8.35431 )
Norm@50keV : 3.363500E-02 ( -1.128328E-02 1.909628E-02) )
------------------------------------------------------------
Chi-Squared = 54.22263 using 59 PHA bins.
Reduced chi-squared = 0.9858660 for 55 degrees of freedom
Null hypothesis probability = 0.504
Photon flux (15-150 keV) in 6.656 sec: 2.48849 ( -0.1191 0.11959 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.86106e-07 ( -5.6809e-08 5.67624e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.176 sec. to 1.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80418 ( -6.978500E-02 7.054794E-02) )
Norm@50keV : 6.207141E-02 ( -2.539430E-03 2.528533E-03) )
------------------------------------------------------------
Chi-Squared = 56.33092 using 59 PHA bins.
Reduced chi-squared = 0.9882617 for 57 degrees of freedom
Null hypothesis probability = 0.500
Photon flux (15-150 keV) in 0.9600 sec: 8.56720 ( -0.33922 0.33984 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48656e-07 ( -2.29469e-08 2.28643e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13066 ( -0.335589 0.311000 )
Epeak [keV] : 60.9259 ( -7.30446 14.3084 )
Norm@50keV : 0.139379 ( -4.275665E-02 6.821053E-02) )
------------------------------------------------------------
Chi-Squared = 41.57076 using 59 PHA bins.
Reduced chi-squared = 0.7423350 for 56 degrees of freedom
Null hypothesis probability = 0.925
Photon flux (15-150 keV) in 0.9600 sec: 8.23367 ( -0.36721 0.36847 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.17395e-07 ( -2.65478e-08 2.67245e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.627675 ( -0.612512 1.88031 )
beta : -2.13391 ( -0.501998 0.209409 )
Epeak [keV] : 47.2042 ( -7.99181 22.3312 )
Norm@50keV : 0.289672 ( -0.500296 5.67922 )
------------------------------------------------------------
Chi-Squared = 38.92146 using 59 PHA bins.
Reduced chi-squared = 0.7076628 for 55 degrees of freedom
Null hypothesis probability = 0.950
Photon flux (15-150 keV) in 0.9600 sec: 8.18072 ( -0.38159 0.36059 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22644e-07 ( -2.592e-08 2.54448e-08 ) ergs/cm2
Plot creation:
Tue Sep 16 04:02:10 EDT 2008