batgrbproduct Analysis for Trigger=173780
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 Jan 9 20:19:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger173780/SDC2
======================================================================
Trigger: 00173780 Segment: 000
BAT Trigger Time: 156822675.776 [s; MET]
Trigger Stop: 156822675.84 [s; MET]
UTC: 2005-12-21T01:51:15.868000 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 328.710912255944 Dec: 16.8957209657683 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.39
Image Trigger?: NO
Rate S/N Ratio: 56.0267793113258 [ if not an image trigger ]
Image S/N Ratio: 16.39
Flight Position: [ source = BAT ]
RA: 328.710912255944 Dec: 16.8957209657683 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.712359871185 Dec: 16.8912204997762 [deg; J2000]
{ 21h 54m 51.0s , +16d 53' 28.4" }
+/- 0.617392392481095 [arcmin] (estimated 90% radius based on SNR)
+/- 0.202285801080562 [arcmin] (formal 1-sigma fit error)
SNR: 60.5782272791677
RA = 21h 54m 51.0s (328.712360 deg.)
Dec = 16d 53' 28" (16.891220 deg.)
Angular difference between Flight and Ground position is 0.282528 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 1.4040000140667 +/- 0.204978044855436
Measured from: 0.0279999971389771
to: 1.43200001120567 [s; relative to TRIGTIME]
T50: 0.551999986171722 +/- 0.088090862073921
Measured from: 0.112000018358231
to: 0.664000004529953 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0279999971389771
to: 0.972000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 2.09200000762939 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.457676 0.593533 0.538529 0.155522
0.013829 0.014939 0.014062 0.010342 [error]
Peak 0.338371 0.496512 0.487513 0.139176
0.010942 0.012513 0.012458 0.008899 [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 1.36e-07 2.68e-07 4.09e-07 1.36e-06 1.15e-06 2.09e-06 erg/cm2
Error 8.90e-09 9.97e-09 1.40e-08 1.12e-07 3.49e-08 0.00e+00 erg/cm2
Peak flux Power-law 3.36e+00 3.86e+00 3.19e+00 4.42e+00 1.20e+01 1.48e+01 ph/cm2/s
Error 2.19e-01 1.48e-01 1.02e-01 3.19e-01 3.93e-01 4.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.36e-07 2.68e-07 4.10e-07 1.35e-06 1.15e-06 1.36e-06 erg/cm2
Error 8.91e-09 9.98e-09 1.40e-08 1.11e-07 3.49e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.27e+00 3.87e+00 3.22e+00 4.09e+00 1.19e+01 1.45e+01 ph/cm2/s
Error 2.93e-01 1.66e-01 1.32e-01 6.77e-01 4.03e-01 8.31e-01 ph/cm2/s
Fluence Band 1.35e-07 2.67e-07 4.09e-07 1.35e-06 1.15e-06 1.37e-06 erg/cm2
Error 8.95e-09 9.93e-09 1.40e-08 1.11e-07 3.49e-08 0.00e+00 erg/cm2
Peak flux Band 3.26e+00 3.87e+00 3.22e+00 4.20e+00 1.19e+01 1.45e+01 ph/cm2/s
Error 2.49e-01 1.51e-01 1.31e-01 5.27e-01 4.26e-01 8.12e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.389 0.058 - - 5.58e-02 1.65e-03 55.195 57
CPL 1.343 0.122 840.9 0.0 5.84e-02 1.66e-03 55.764 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.276 0.056 - - 1.01e-01 2.99e-03 61.796 57
CPL 1.182 0.195 524.9 5000.0 1.11e-01 2.04e-02 61.365 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: 1.280000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.124 -0.032 2.092
T90 1.404 0.028 1.432
T50 0.552 0.112 0.664
Peak 1.000 -0.028 0.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.7124 +16.8912 0.0032 36.6 -178.6 1.8092 60.6 TRIG_00173780
------------------------------------------
Foreground time interval of the image:
0.224 2.348 (delta_t = 2.124 [sec])
Background time interval of the image:
-219.915 0.224 (delta_t = 220.139 [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
Time interval is from 0.224 sec. to 2.348 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38936 ( -5.800664E-02 5.796516E-02) )
Norm@50keV : 5.576153E-02 ( -1.654625E-03 1.652703E-03) )
------------------------------------------------------------
Chi-Squared = 55.19547 using 59 PHA bins.
Reduced chi-squared = 0.9683416 for 57 degrees of freedom
Null hypothesis probability = 0.543
Photon flux (15-150 keV) in 2.124 sec: 6.77449 ( -0.22949 0.23054 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14695e-06 ( -3.48591e-08 3.48761e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.224 sec. to 2.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34266 ( -0.136570 0.106885 )
Epeak [keV] : 840.851 ( )
Norm@50keV : 5.840328E-02 ( -1.657277E-03 1.654863E-03) )
------------------------------------------------------------
Chi-Squared = 55.76365 using 59 PHA bins.
Reduced chi-squared = 0.9957795 for 56 degrees of freedom
Null hypothesis probability = 0.484
Photon flux (15-150 keV) in 2.124 sec: 6.77062 ( -0.22929 0.23044 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14723e-06 ( -3.48718e-08 3.48952e-08 ) ergs/cm2
Band function
Time interval is from 0.224 sec. to 2.348 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08585 ( -8.91415 2.76727 )
beta : -1.38910 ( -5.809164E-02 5.779517E-02) )
Epeak [keV] : 45.4195 ( -45.3195 9954.58 )
Norm@50keV : 0.108661 ( -3.193275E-02 7.47134 )
------------------------------------------------------------
Chi-Squared = 55.19897 using 59 PHA bins.
Reduced chi-squared = 1.003618 for 55 degrees of freedom
Null hypothesis probability = 0.467
Photon flux (15-150 keV) in 2.124 sec: 7.54504 ( -0.9694 10.5112 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14621e-06 ( -3.484e-08 3.48867e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.228 sec. to 1.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27633 ( -5.563009E-02 5.549657E-02) )
Norm@50keV : 0.101009 ( -2.994463E-03 2.989374E-03) )
------------------------------------------------------------
Chi-Squared = 61.79592 using 59 PHA bins.
Reduced chi-squared = 1.084139 for 57 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 1.000 sec: 11.9997 ( -0.3922 0.3941 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00405e-06 ( -3.0538e-08 3.0572e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.228 sec. to 1.228 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.18194 ( -0.222992 0.167650 )
Epeak [keV] : 524.945 ( -524.935 9475.06 )
Norm@50keV : 0.110723 ( -1.473510E-02 2.606691E-02) )
------------------------------------------------------------
Chi-Squared = 61.36505 using 59 PHA bins.
but latest trial 1.31331 gives Chi-Squared = 1.87336
but latest trial 0.100383 gives Chi-Squared = 0.729012
Reduced chi-squared = 1.095804 for 56 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 1.000 sec: 11.9354 ( -0.3837 0.423 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00202e-06 ( -3.145e-08 3.0943e-08 ) ergs/cm2
Band function
Time interval is from 0.228 sec. to 1.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.977578 ( -9.02242 2.89644 )
beta : -1.27609 ( -5.573153E-02 5.546749E-02) )
Epeak [keV] : 55.6759 ( -905.098 9094.80 )
Norm@50keV : 0.190420 ( -7.607348E-03 7.364608E+06) )
------------------------------------------------------------
Chi-Squared = 61.80160 using 59 PHA bins.
Reduced chi-squared = 1.123665 for 55 degrees of freedom
Null hypothesis probability = 0.246
Photon flux (15-150 keV) in 1.000 sec: 11.9211 ( -0.4182 0.4334 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00096e-06 ( -3.1548e-08 3.1398e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 20:39:48 EST 2008