batgrbproduct Analysis for Trigger=114893
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): Sat Jan 5 00:34:51 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger114893/SDC
======================================================================
Trigger: 00114893 Segment: 000
BAT Trigger Time: 135514834.112 [s; MET]
Trigger Stop: 135514835.136 [s; MET]
UTC: 2005-04-18T11:00:34.629320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 44.3414527693041 Dec: -18.5378750599418 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18
Image Trigger?: NO
Rate S/N Ratio: 39.6358423652128 [ if not an image trigger ]
Image S/N Ratio: 18
Flight Position: [ source = BAT ]
RA: 44.3414527693041 Dec: -18.5378750599418 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.3379903009031 Dec: -18.5403506434004 [deg; J2000]
{ 02h 57m 21.1s , -18d 32' 25.3" }
+/- 0.794964377310231 [arcmin] (estimated 90% radius based on SNR)
+/- 0.229984770379248 [arcmin] (formal 1-sigma fit error)
SNR: 42.216172332463
RA = 2h 57m 21.1s (44.337990 deg.)
Dec = -18d 32' 25" (-18.540351 deg.)
Angular difference between Flight and Ground position is 0.246696 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 82.3120000064373 +/- 1.95342981001946
Measured from: -5.08799999952316
to: 77.2240000069141 [s; relative to TRIGTIME]
T50: 60.891999989748 +/- 3.00621024253394
Measured from: 1.12800002098083
to: 62.0200000107288 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.719999998807907
to: 1.71999999880791 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.35199999809265
to: 86.4280000030994 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.426030 3.092490 2.159620 0.449704
0.082972 0.084244 0.072833 0.059302 [error]
Peak 0.085454 0.143102 0.174858 0.036142
0.009876 0.010826 0.010724 0.007653 [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 8.79e-07 1.42e-06 1.73e-06 4.14e-06 5.21e-06 8.16e-06 erg/cm2
Error 5.89e-08 5.47e-08 7.56e-08 4.10e-07 1.83e-07 4.52e-07 erg/cm2
Peak flux Power-law 9.12e-01 1.15e+00 1.05e+00 1.68e+00 3.68e+00 4.79e+00 ph/cm2/s
Error 1.36e-01 1.06e-01 8.14e-02 2.74e-01 2.84e-01 3.57e-01 ph/cm2/s
Fluence Cutoff-PL 8.24e-07 1.45e-06 1.77e-06 2.86e-06 5.12e-06 6.82e-06 erg/cm2
Error 7.66e-08 6.09e-08 8.55e-08 9.69e-07 2.04e-07 9.82e-07 erg/cm2
Peak flux Cutoff-PL 7.95e-01 1.18e+00 1.13e+00 1.08e+00 3.63e+00 4.19e+00 ph/cm2/s
Error 1.76e-01 1.16e-01 1.14e-01 4.89e-01 2.90e-01 5.72e-01 ph/cm2/s
Fluence Band 8.06e-07 1.44e-06 1.76e-06 3.37e-06 5.10e-06 6.89e-06 erg/cm2
Error 8.17e-08 6.66e-08 9.47e-08 7.64e-07 2.04e-07 0.00e+00 erg/cm2
Peak flux Band 7.90e-01 1.19e+00 1.13e+00 1.26e+00 3.61e+00 4.38e+00 ph/cm2/s
Error 1.81e-01 1.20e-01 1.13e-01 4.90e-01 2.87e-01 5.93e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.713 0.065 - - 5.94e-03 2.04e-04 35.180 57
CPL 1.421 0.275 106.6 218.0 8.14e-03 2.42e-03 31.677 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.127 0.123 - - 3.17e-02 2.33e-03 43.995 57
CPL 0.609 0.556 158.2 2214.0 5.36e-02 3.16e-02 41.152 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: 74.112000 sec.
T50 in the 50-300 keV band: 49.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 94.780 -8.352 86.428
T90 82.312 -5.088 77.224
T50 60.892 1.128 62.020
Peak 1.000 0.720 1.720
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.3380 -18.5404 0.0045 39.4 -133.8 8.1996 42.2 TRIG_00114893
------------------------------------------
Foreground time interval of the image:
-8.352 86.428 (delta_t = 94.780 [sec])
Background time interval of the image:
-177.811 -8.352 (delta_t = 169.459 [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 -8.352 sec. to 86.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71332 ( -6.530678E-02 6.553710E-02) )
Norm@50keV : 5.939794E-03 ( -2.042470E-04 2.041324E-04) )
------------------------------------------------------------
Chi-Squared = 35.18023 using 59 PHA bins.
Reduced chi-squared = 0.6171971 for 57 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 94.78 sec: 0.792577 ( -0.031009 0.031171 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20694e-06 ( -1.83153e-07 1.83807e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.352 sec. to 86.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42128 ( -0.284778 0.266056 )
Epeak [keV] : 106.582 ( -28.2206 407.747 )
Norm@50keV : 8.138601E-03 ( -1.987602E-03 2.848012E-03) )
------------------------------------------------------------
Chi-Squared = 31.67732 using 59 PHA bins.
Reduced chi-squared = 0.5656665 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 94.78 sec: 0.775052 ( -0.034408 0.034427 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.11643e-06 ( -2.05246e-07 2.02109e-07 ) ergs/cm2
Band function
Time interval is from -8.352 sec. to 86.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36129 ( -0.314427 0.823422 )
beta : -1.96701 ( -8.03299 0.254098 )
Epeak [keV] : 93.6273 ( -51.7239 303.371 )
Norm@50keV : 8.762579E-03 ( -2.536480E-03 2.069223E-02) )
------------------------------------------------------------
Chi-Squared = 31.43396 using 59 PHA bins.
Reduced chi-squared = 0.5715266 for 55 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 94.78 sec: 0.772845 ( -0.035667 0.034721 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09915e-06 ( -2.0463e-07 2.04099e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.720 sec. to 1.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12680 ( -0.124413 0.122337 )
Norm@50keV : 3.166099E-02 ( -2.332339E-03 2.326176E-03) )
------------------------------------------------------------
Chi-Squared = 43.99526 using 59 PHA bins.
Reduced chi-squared = 0.7718467 for 57 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 1.000 sec: 3.68260 ( -0.28399 0.28471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28225e-07 ( -2.4941e-08 2.5019e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.720 sec. to 1.720 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.608703 ( -0.598775 0.513338 )
Epeak [keV] : 158.209 ( -54.9263 4373.07 )
Norm@50keV : 5.356286E-02 ( -2.098694E-02 4.214987E-02) )
------------------------------------------------------------
Chi-Squared = 41.15197 using 59 PHA bins.
but latest trial 1.12045 gives Chi-Squared = 3.32344
but latest trial 3.257514E-02 gives Chi-Squared = 2.73821
Reduced chi-squared = 0.7348566 for 56 degrees of freedom
Null hypothesis probability = 0.931
Photon flux (15-150 keV) in 1.000 sec: 3.62679 ( -0.28946 0.29013 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25114e-07 ( -2.585e-08 2.5694e-08 ) ergs/cm2
Band function
Time interval is from 0.720 sec. to 1.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.734329 ( -9.26567 0.749898 )
beta : -1.77224 ( -8.22776 11.4097 )
Epeak [keV] : 198.387 ( -140.214 702.106 )
Norm@50keV : 4.635072E-02 ( -2.370575E-02 0.318217 )
------------------------------------------------------------
Chi-Squared = 41.37731 using 59 PHA bins.
Reduced chi-squared = 0.7523147 for 55 degrees of freedom
Null hypothesis probability = 0.913
Photon flux (15-150 keV) in 1.000 sec: 3.61238 ( -0.28071 0.29233 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24927e-07 ( -2.5878e-08 2.5639e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 00:51:38 EST 2008