batgrbproduct Analysis for Trigger=159994
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 16:37:28 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger159994/SDC
======================================================================
Trigger: 00159994 Segment: 000
BAT Trigger Time: 151180088.768 [s; MET]
Trigger Stop: 151180089.28 [s; MET]
UTC: 2005-10-16T18:28:08.981460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 132.066883148705 Dec: 13.6575657183825 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: NO
Rate S/N Ratio: 15.0332963783729 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 132.066883148705 Dec: 13.6575657183825 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.11732514323 Dec: 13.6288773943355 [deg; J2000]
{ 08h 48m 28.2s , +13d 37' 44.0" }
+/- 1.65823978785053 [arcmin] (estimated 90% radius based on SNR)
+/- 0.69780139340747 [arcmin] (formal 1-sigma fit error)
SNR: 14.7685030822729
RA = 8h 48m 28.2s (132.117325 deg.)
Dec = 13d 37' 44" (13.628877 deg.)
Angular difference between Flight and Ground position is 3.407795 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 4.03200000524521 +/- 0.469570015426604
Measured from: 0.183999985456467
to: 4.21599999070168 [s; relative to TRIGTIME]
T50: 2.4360000193119 +/- 0.437008014151546
Measured from: 0.579999983310699
to: 3.0160000026226 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.107999980449677
to: 1.10799998044968 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0239999890327454
to: 4.61599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.160475 0.122298 0.054291 0.002413
0.013066 0.012950 0.010823 0.009094 [error]
Peak 0.052869 0.062060 0.031711 0.001345
0.006370 0.006429 0.005398 0.004396 [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 5.19e-08 5.56e-08 4.23e-08 5.24e-08 1.70e-07 2.03e-07 erg/cm2
Error 7.48e-09 6.59e-09 9.67e-09 2.27e-08 2.25e-08 3.58e-08 erg/cm2
Peak flux Power-law 5.62e-01 4.36e-01 2.27e-01 1.71e-01 1.30e+00 1.40e+00 ph/cm2/s
Error 1.02e-01 5.44e-02 4.36e-02 6.22e-02 1.64e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 5.03e-08 5.99e-08 3.88e-08 1.60e-08 1.60e-07 1.66e-07 erg/cm2
Error 8.00e-09 8.72e-09 1.22e-08 3.31e-08 2.49e-08 4.35e-08 erg/cm2
Peak flux Cutoff-PL 5.17e-01 4.87e-01 2.27e-01 5.73e-02 1.27e+00 1.29e+00 ph/cm2/s
Error 1.14e-01 7.66e-02 5.27e-02 8.74e-02 1.67e-01 1.36e-01 ph/cm2/s
Fluence Band 5.03e-08 6.01e-08 3.70e-08 3.33e-08 1.62e-07 1.88e-07 erg/cm2
Error 9.22e-09 1.08e-08 1.10e-08 2.38e-08 2.59e-08 3.22e-08 erg/cm2
Peak flux Band 5.04e-01 5.05e-01 2.11e-01 1.10e-01 1.28e+00 1.33e+00 ph/cm2/s
Error 1.16e-01 8.14e-02 4.80e-02 9.64e-02 1.70e-01 1.85e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.395 0.230 - - 3.79e-03 6.33e-04 67.905 57
CPL 1.738 0.658 15.0 15.3 9.67e-03 2.11e-02 66.111 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.942 0.220 - - 8.92e-03 1.32e-03 60.379 57
CPL 1.035 1.052 44.9 78.7 2.98e-02 7.49e-02 57.519 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 4.592 0.024 4.616
T90 4.032 0.184 4.216
T50 2.436 0.580 3.016
Peak 1.000 0.108 1.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.1173 +13.6289 0.0130 33.3 -168.3 0.3703 14.8 TRIG_00159994
------------------------------------------
Foreground time interval of the image:
0.024 4.616 (delta_t = 4.592 [sec])
Background time interval of the image:
-299.768 0.024 (delta_t = 299.792 [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 0.024 sec. to 4.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39517 ( -0.220797 0.238689 )
Norm@50keV : 3.792288E-03 ( -6.386389E-04 6.277876E-04) )
------------------------------------------------------------
Chi-Squared = 67.90466 using 59 PHA bins.
Reduced chi-squared = 1.191310 for 57 degrees of freedom
Null hypothesis probability = 0.153
Photon flux (15-150 keV) in 4.592 sec: 0.699688 ( -0.077401 0.077415 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69692e-07 ( -2.22666e-08 2.28255e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 4.616 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73768 ( -1.08704 0.228183 )
Epeak [keV] : 14.9655 ( -13.9520 16.6702 )
Norm@50keV : 9.668065E-03 ( -4.268419E-03 3.791101E-02) )
------------------------------------------------------------
Chi-Squared = 66.11128 using 59 PHA bins.
but latest trial 0.919046 gives Chi-Squared = 14.3500
Reduced chi-squared = 1.180559 for 56 degrees of freedom
Null hypothesis probability = 0.167
Photon flux (15-150 keV) in 4.592 sec: 0.686958 ( -0.078799 0.078592 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59895e-07 ( -2.40892e-08 2.56785e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 4.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.80409 ( -8.19591 0.146232 )
beta : -9.27544 ( -0.724564 7.01662 )
Epeak [keV] : 12.2019 ( -12.1019 19.4798 )
Norm@50keV : 8.885267E-03 ( -2.890513E-03 4.451341E-02) )
------------------------------------------------------------
Chi-Squared = 66.12919 using 59 PHA bins.
Reduced chi-squared = 1.202349 for 55 degrees of freedom
Null hypothesis probability = 0.145
Photon flux (15-150 keV) in 4.592 sec: 0.686918 ( -0.078763 0.078928 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61756e-07 ( -2.33549e-08 2.85039e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94203 ( -0.214125 0.225481 )
Norm@50keV : 8.922471E-03 ( -1.335333E-03 1.304301E-03) )
------------------------------------------------------------
Chi-Squared = 60.37921 using 59 PHA bins.
Reduced chi-squared = 1.059284 for 57 degrees of freedom
Null hypothesis probability = 0.355
Photon flux (15-150 keV) in 1.000 sec: 1.30393 ( -0.164 0.16412 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.20731e-08 ( -1.17507e-08 1.19968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03478 ( -1.18868 0.914530 )
Epeak [keV] : 44.8887 ( -19.6166 137.694 )
Norm@50keV : 2.977397E-02 ( -2.977397E-02 0.119985 )
------------------------------------------------------------
Chi-Squared = 57.51891 using 59 PHA bins.
Reduced chi-squared = 1.027123 for 56 degrees of freedom
Null hypothesis probability = 0.419
Photon flux (15-150 keV) in 1.000 sec: 1.27409 ( -0.16665 0.16691 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61516e-08 ( -1.26497e-08 1.34107e-08 ) ergs/cm2
Band function
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.533329 ( -1.30352 4.61887 )
beta : -2.33953 ( -7.66047 0.461309 )
Epeak [keV] : 37.0312 ( -17.3238 39.5786 )
Norm@50keV : 6.875122E-02 ( -271.720 167.724 )
------------------------------------------------------------
Chi-Squared = 56.83899 using 59 PHA bins.
Reduced chi-squared = 1.033436 for 55 degrees of freedom
Null hypothesis probability = 0.406
Photon flux (15-150 keV) in 1.000 sec: 1.27634 ( -0.16334 0.17671 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.91064e-08 ( -1.25367e-08 1.21186e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 16:47:56 EST 2008