batgrbproduct Analysis for Trigger=236430
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 2 09:58:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger236430/GCN5_download_cron
======================================================================
Trigger: 00236430 Segment: 000
BAT Trigger Time: 184122032.768 [s; MET]
Trigger Stop: 184122044.928 [s; MET]
UTC: 2006-11-02T01:00:31.223660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.405245009419 Dec: -17.0663699042152 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.75
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 6.75
Flight Position: [ source = BAT ]
RA: 148.405245009419 Dec: -17.0663699042152 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 148.39411241011 Dec: -17.0296398734772 [deg; J2000]
{ 09h 53m 34.6s , -17d 01' 46.7" }
+/- 2.67990023179086 [arcmin] (estimated 90% radius based on SNR)
+/- 1.20591283454763 [arcmin] (formal 1-sigma fit error)
SNR: 7.43909907006684
RA = 9h 53m 34.6s (148.394112 deg.)
Dec = -17d 1' 47" (-17.029640 deg.)
Angular difference between Flight and Ground position is 2.294463 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 45.5399999916553 +/- 9.68323274111956
Measured from: 1.2960000038147
to: 46.83599999547 [s; relative to TRIGTIME]
T50: 18.2520000040531 +/- 16.6569439105256
Measured from: 10.5359999835491
to: 28.7879999876022 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.36800000071526
to: 4.36800000071526 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.995999991893768
to: 48.8719999790192 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.111138 0.208617 0.139883 0.027397
0.032155 0.032706 0.029183 0.026091 [error]
Peak 0.002877 0.011202 0.016283 0.002291
0.004667 0.004721 0.004303 0.003780 [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 4.00e-08 7.10e-08 9.66e-08 2.71e-07 2.79e-07 4.82e-07 erg/cm2
Error 1.27e-08 1.41e-08 2.84e-08 1.73e-07 6.72e-08 1.97e-07 erg/cm2
Peak flux Power-law 4.13e-02 6.48e-02 7.64e-02 1.75e-01 2.33e-01 3.57e-01 ph/cm2/s
Error 3.20e-02 3.70e-02 3.16e-02 1.57e-01 1.01e-01 1.68e-01 ph/cm2/s
Fluence Cutoff-PL 4.00e-08 7.11e-08 9.66e-08 2.69e-07 2.79e-07 4.76e-07 erg/cm2
Error 1.27e-08 1.42e-08 2.84e-08 1.71e-07 6.72e-08 1.96e-07 erg/cm2
Peak flux Cutoff-PL 1.24e-02 5.94e-02 1.04e-01 4.14e-02 2.10e-01 2.19e-01 ph/cm2/s
Error 3.34e-02 4.06e-02 4.38e-02 1.31e-01 9.46e-02 1.59e-01 ph/cm2/s
Fluence Band 3.82e-08 7.93e-08 8.80e-08 1.81e-07 2.63e-07 4.43e-07 erg/cm2
Error 1.27e-08 1.88e-08 2.35e-08 1.42e-07 6.38e-08 1.41e-07 erg/cm2
Peak flux Band 6.61e-03 5.05e-02 1.10e-01 4.03e-02 1.98e-01 2.12e-01 ph/cm2/s
Error 1.86e-02 4.50e-02 4.98e-02 4.44e-02 9.77e-02 1.25e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.556 0.371 - - 5.96e-04 1.29e-04 55.573 57
CPL 1.532 1.242 696.5 0.0 6.18e-04 1.30e-04 55.619 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.761 0.732 - - 2.03e-03 9.19e-04 66.940 57
CPL -2.495 1.942 89.7 4961.3 3.32e-02 2.75e-02 65.075 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 49.868 -0.996 48.872
T90 45.540 1.296 46.836
T50 18.252 10.536 28.788
Peak 1.000 3.368 4.368
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
148.3941 -17.0296 0.0258 5.8 -160.7 0.4928 7.4 TRIG_00236430
------------------------------------------
Foreground time interval of the image:
-0.996 48.872 (delta_t = 49.868 [sec])
Background time interval of the image:
-239.768 -0.996 (delta_t = 238.772 [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 -0.996 sec. to 48.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55637 ( -0.366361 0.374884 )
Norm@50keV : 5.957544E-04 ( -1.311991E-04 1.268438E-04) )
------------------------------------------------------------
Chi-Squared = 55.57326 using 59 PHA bins.
Reduced chi-squared = 0.9749695 for 57 degrees of freedom
Null hypothesis probability = 0.529
Photon flux (15-150 keV) in 49.87 sec: 7.555820E-02 ( -0.0149089 0.0149143 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79457e-07 ( -6.60538e-08 6.83059e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.996 sec. to 48.872 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53153 ( -1.06961 1.41372 )
Epeak [keV] : 696.493 ( )
Norm@50keV : 6.184304E-04 ( -1.296161E-04 1.302591E-04) )
------------------------------------------------------------
Chi-Squared = 55.61898 using 59 PHA bins.
but latest trial 2.94475 gives Chi-Squared = 2.99908
Reduced chi-squared = 0.9931961 for 56 degrees of freedom
Null hypothesis probability = 0.489
Photon flux (15-150 keV) in 49.87 sec: 7.553496E-02 ( -0.0149047 0.0149103 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79403e-07 ( -6.60374e-08 6.83458e-08 ) ergs/cm2
Band function
Time interval is from -0.996 sec. to 48.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06456 ( -14.7846 0.215409 )
beta : -1.59692 ( -0.746925 0.599866 )
Epeak [keV] : 59.2310 ( -31.0592 664.121 )
Norm@50keV : 1.268018E-03 ( -3.62099 23.9495 )
------------------------------------------------------------
Chi-Squared = 55.25589 using 59 PHA bins.
Reduced chi-squared = 1.004653 for 55 degrees of freedom
Null hypothesis probability = 0.465
Photon flux (15-150 keV) in 49.87 sec: 7.513810E-02 ( -0.0151958 0.0147511 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62751e-07 ( -5.73365e-08 7.01661e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.368 sec. to 4.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.760921 ( -0.804875 0.658242 )
Norm@50keV : 2.026731E-03 ( -9.388416E-04 8.983936E-04) )
------------------------------------------------------------
Chi-Squared = 66.94011 using 59 PHA bins.
Reduced chi-squared = 1.174388 for 57 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 1.000 sec: 0.233409 ( -0.099762 0.102637 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4128e-08 ( -1.01671e-08 1.02174e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.368 sec. to 4.368 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.49480 ( -0.505204 3.37790 )
Epeak [keV] : 89.6987 ( -27.4138 9895.18 )
Norm@50keV : 3.324852E-02 ( -3.324852E-02 2.175620E-02) )
------------------------------------------------------------
Chi-Squared = 65.07481 using 59 PHA bins.
but latest trial 1058.97 gives Chi-Squared = 12.0005
but latest trial 5.630739E-02 gives Chi-Squared = 1.25771
Reduced chi-squared = 1.162050 for 56 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 1.000 sec: 0.209792 ( -0.081406 0.107852 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25001e-08 ( -9.4872e-09 1.07433e-08 ) ergs/cm2
Band function
Time interval is from 3.368 sec. to 4.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.11457 ( -3.23940 2.88543 )
beta : -9.23123 ( -0.768768 19.2312 )
Epeak [keV] : 92.8845 ( -30.5387 9907.12 )
Norm@50keV : 2.449687E-02 ( -9.997272E-03 3.657184E-02) )
------------------------------------------------------------
Chi-Squared = 65.09218 using 59 PHA bins.
Reduced chi-squared = 1.183494 for 55 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 1.000 sec: 0.197915 ( -0.078854 0.116525 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24316e-08 ( -8.8244e-09 1.02294e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 10:19:00 EST 2008