batgrbproduct Analysis for Trigger=324744
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): Mon Sep 15 06:40:04 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger324744/GCN5_download_cron
======================================================================
Trigger: 00324744 Segment: 000
BAT Trigger Time: 243129773.056 [s; MET]
Trigger Stop: 243129777.152 [s; MET]
UTC: 2008-09-15T00:02:49.957760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.0040672407145 Dec: -76.0144041971717 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 8.18535277187245 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 18.0040672407145 Dec: -76.0144041971717 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 17.9105836442339 Dec: -76.0416340239231 [deg; J2000]
{ 01h 11m 38.5s , -76d 02' 29.9" }
+/- 2.42521916768093 [arcmin] (estimated 90% radius based on SNR)
+/- 0.937692631618763 [arcmin] (formal 1-sigma fit error)
SNR: 8.57973957461585
Angular difference between Flight and Ground position is 2.122109 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 14.0360000133514 +/- 4.69043793568358
Measured from: -0.207999914884567
to: 13.8280000984669 [s; relative to TRIGTIME]
T50: 5.77599999308586 +/- 2.50215267644199
Measured from: 2.15600010752678
to: 7.93200010061264 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.02799999713898
to: 4.02799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.23999997973442
to: 16.2000000178814 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.112951 0.172389 0.067074 0.009527
0.022367 0.022365 0.020093 0.018474 [error]
Peak 0.015001 0.022463 0.015379 0.000210
0.005358 0.005354 0.004842 0.004593 [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 3.56e-08 6.01e-08 7.71e-08 1.99e-07 2.28e-07 3.70e-07 erg/cm2
Error 9.19e-09 1.02e-08 1.90e-08 1.01e-07 4.54e-08 1.19e-07 erg/cm2
Peak flux Power-law 1.59e-01 1.59e-01 1.11e-01 1.23e-01 4.77e-01 5.51e-01 ph/cm2/s
Error 7.32e-02 4.46e-02 4.07e-02 9.62e-02 1.28e-01 1.52e-01 ph/cm2/s
Fluence Cutoff-PL 3.16e-08 7.16e-08 6.82e-08 2.07e-08 1.88e-07 1.92e-07 erg/cm2
Error 1.12e-08 1.85e-08 3.07e-08 1.33e-07 5.98e-08 1.39e-07 erg/cm2
Peak flux Cutoff-PL 1.59e-01 1.59e-01 1.11e-01 1.22e-01 4.77e-01 5.51e-01 ph/cm2/s
Error 7.32e-02 4.46e-02 4.07e-02 9.56e-02 1.28e-01 1.70e-01 ph/cm2/s
Fluence Band 2.81e-08 7.53e-08 6.73e-08 9.08e-08 2.05e-07 2.79e-07 erg/cm2
Error 1.09e-08 1.58e-08 1.86e-08 3.94e-08 4.66e-08 0.00e+00 erg/cm2
Peak flux Band 1.59e-01 1.59e-01 1.11e-01 1.22e-01 4.77e-01 5.52e-01 ph/cm2/s
Error 7.42e-02 4.55e-02 4.15e-02 9.56e-02 1.28e-01 1.52e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.640 0.294 - - 1.40e-03 2.61e-04 56.431 57
CPL 0.158 2.407 50.7 4981.2 1.03e-02 2.27e-01 54.742 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.514 0.516 - - 3.81e-03 1.08e-03 74.155 57
CPL 1.336 0.000 192.4 5000.0 4.60e-03 1.68e-02 74.209 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 17.440 -1.240 16.200
T90 14.036 -0.208 13.828
T50 5.776 2.156 7.932
Peak 1.000 3.028 4.028
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
17.9106 -76.0416 0.0225 27.4 -170.2 0.3736 8.6 TRIG_00324744
------------------------------------------
Foreground time interval of the image:
-1.240 16.200 (delta_t = 17.440 [sec])
Background time interval of the image:
-239.056 -1.240 (delta_t = 237.816 [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 -1.240 sec. to 16.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64007 ( -0.289512 0.298912 )
Norm@50keV : 1.401848E-03 ( -2.632611E-04 2.578527E-04) )
------------------------------------------------------------
Chi-Squared = 56.43058 using 59 PHA bins.
Reduced chi-squared = 0.9900102 for 57 degrees of freedom
Null hypothesis probability = 0.496
Photon flux (15-150 keV) in 17.44 sec: 0.182438 ( -0.030997 0.031018 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27634e-07 ( -4.48051e-08 4.60521e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.240 sec. to 16.200 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.157584 ( -3.15758 1.65729 )
Epeak [keV] : 50.6731 ( -13.0293 9949.33 )
Norm@50keV : 1.025310E-02 ( -1.025310E-02 0.442877 )
------------------------------------------------------------
Chi-Squared = 54.74213 using 59 PHA bins.
but latest trial 1.81488 gives Chi-Squared = 2.80811
Reduced chi-squared = 0.9775380 for 56 degrees of freedom
Null hypothesis probability = 0.523
Photon flux (15-150 keV) in 17.44 sec: 0.171319 ( -0.034987 0.034755 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88049e-07 ( -5.1869e-08 6.77596e-08 ) ergs/cm2
Band function
Time interval is from -1.240 sec. to 16.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.347275E-02 ( -2.89869 4.92653 )
beta : -2.22078 ( -7.77922 0.625925 )
Epeak [keV] : 45.7427 ( -22.0188 42.5489 )
Norm@50keV : 1.532704E-02 ( -0.130853 12.8427 )
------------------------------------------------------------
Chi-Squared = 52.81744 using 59 PHA bins.
Reduced chi-squared = 0.9603171 for 55 degrees of freedom
Null hypothesis probability = 0.558
Photon flux (15-150 keV) in 17.44 sec: 0.173713 ( -0.033075 0.030586 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04597e-07 ( -4.69511e-08 4.62212e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.028 sec. to 4.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51408 ( -0.500173 0.531481 )
Norm@50keV : 3.807194E-03 ( -1.101400E-03 1.058846E-03) )
------------------------------------------------------------
Chi-Squared = 74.15505 using 59 PHA bins.
Reduced chi-squared = 1.300966 for 57 degrees of freedom
Null hypothesis probability = 6.300E-02
Photon flux (15-150 keV) in 1.000 sec: 0.477112 ( -0.12826 0.12856 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60093e-08 ( -1.11241e-08 1.15425e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.028 sec. to 4.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33588 ( )
Epeak [keV] : 192.400 ( -48.9333 9951.06 )
Norm@50keV : 4.603732E-03 ( -1.705793E-03 3.194400E-02) )
------------------------------------------------------------
Chi-Squared = 74.20881 using 59 PHA bins.
Reduced chi-squared = 1.325157 for 56 degrees of freedom
Null hypothesis probability = 5.213E-02
Photon flux (15-150 keV) in 1.000 sec: 0.476937 ( -0.128216 0.128518 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5889e-08 ( -1.41771e-08 1.1692e-08 ) ergs/cm2
Band function
Time interval is from 3.028 sec. to 4.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41770 ( -6.09825 4.65758 )
beta : -6.44562 ( -0.531582 0.500151 )
Epeak [keV] : 309.197 ( -309.097 9690.80 )
Norm@50keV : 4.221508E-03 ( -0.149738 0.143918 )
------------------------------------------------------------
Chi-Squared = 74.17666 using 59 PHA bins.
Reduced chi-squared = 1.348667 for 55 degrees of freedom
Null hypothesis probability = 4.338E-02
Photon flux (15-150 keV) in 1.000 sec: 0.476938 ( -0.128217 0.128484 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6013e-08 ( -1.11448e-08 1.15136e-08 ) ergs/cm2
Plot creation:
Mon Sep 15 07:03:26 EDT 2008