batgrbproduct Analysis for Trigger=224552
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 00:56:25 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger224552/SDC
======================================================================
Trigger: 00224552 Segment: 000
BAT Trigger Time: 177289340.416 [s; MET]
Trigger Stop: 177289341.44 [s; MET]
UTC: 2006-08-14T23:02:19.035400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.347997937736 Dec: 20.5828671043413 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.61
Image Trigger?: NO
Rate S/N Ratio: 32.5883414736007 [ if not an image trigger ]
Image S/N Ratio: 15.61
Flight Position: [ source = BAT ]
RA: 221.347997937736 Dec: 20.5828671043413 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 221.333528932691 Dec: 20.5846460435458 [deg; J2000]
{ 14h 45m 20.0s , +20d 35' 04.7" }
+/- 0.690875444742529 [arcmin] (estimated 90% radius based on SNR)
+/- 0.184068639831373 [arcmin] (formal 1-sigma fit error)
SNR: 51.5878345510116
RA = 14h 45m 20.0s (221.333529 deg.)
Dec = 20d 35' 5" (20.584646 deg.)
Angular difference between Flight and Ground position is 0.819697 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 145.316000014544 +/- 4.89845852373387
Measured from: 0.983999997377396
to: 146.300000011921 [s; relative to TRIGTIME]
T50: 61.636000007391 +/- 0.678126832594966
Measured from: 14.6959999799728
to: 76.3319999873638 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.4000000059605
to: 16.4000000059605 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.688000023365
to: 218.60799998045 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.741013 8.753247 6.594366 1.494184
0.082492 0.083315 0.074322 0.060535 [error]
Peak 0.217502 0.310374 0.283139 0.076126
0.008831 0.010252 0.009933 0.007282 [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 2.16e-06 3.82e-06 5.18e-06 1.45e-05 1.50e-05 2.56e-05 erg/cm2
Error 8.49e-08 8.52e-08 9.43e-08 6.55e-07 2.45e-07 6.65e-07 erg/cm2
Peak flux Power-law 2.09e+00 2.35e+00 1.90e+00 2.55e+00 7.27e+00 8.88e+00 ph/cm2/s
Error 1.63e-01 1.08e-01 8.26e-02 2.45e-01 2.93e-01 3.39e-01 ph/cm2/s
Fluence Cutoff-PL 2.01e-06 3.83e-06 5.30e-06 1.14e-05 1.48e-05 2.25e-05 erg/cm2
Error 1.25e-07 6.53e-08 1.19e-07 1.76e-06 2.07e-07 1.81e-06 erg/cm2
Peak flux Cutoff-PL 1.96e+00 2.38e+00 1.95e+00 2.04e+00 7.18e+00 8.31e+00 ph/cm2/s
Error 2.12e-01 1.14e-01 5.21e-02 5.48e-01 3.07e-01 6.56e-01 ph/cm2/s
Fluence Band 1.99e-06 3.82e-06 5.29e-06 1.14e-05 1.48e-05 2.25e-05 erg/cm2
Error 1.24e-07 8.64e-08 1.19e-07 1.76e-06 2.75e-07 1.79e-06 erg/cm2
Peak flux Band 2.10e+00 2.36e+00 1.90e+00 2.54e+00 7.27e+00 8.88e+00 ph/cm2/s
Error 9.61e-02 9.10e-02 7.66e-02 1.80e-01 2.80e-01 3.34e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.562 0.034 - - 6.94e-03 1.17e-04 32.420 57
CPL 1.340 0.149 182.0 133.8 8.53e-03 1.17e-03 25.709 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.309 0.070 - - 6.08e-02 2.28e-03 46.461 57
CPL 1.077 0.280 227.5 4934.2 7.72e-02 2.18e-02 44.410 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: 133.184000 sec.
T50 in the 50-300 keV band: 60.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 230.296 -11.688 218.608
T90 145.316 0.984 146.300
T50 61.636 14.696 76.332
Peak 1.000 15.400 16.400
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
221.3335 +20.5846 0.0037 28.1 28.5 6.5852 51.6 TRIG_00224552
------------------------------------------
Foreground time interval of the image:
-11.688 15.589 (delta_t = 27.277 [sec])
Background time interval of the image:
-22.611 -11.688 (delta_t = 10.923 [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 -11.688 sec. to 218.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56177 ( -3.370798E-02 3.364897E-02) )
Norm@50keV : 6.935156E-03 ( -1.165993E-04 1.164447E-04) )
------------------------------------------------------------
Chi-Squared = 32.42016 using 59 PHA bins.
Reduced chi-squared = 0.5687748 for 57 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 230.3 sec: 0.880967 ( -0.018876 0.019002 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50111e-05 ( -2.44556e-07 2.44648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.688 sec. to 218.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34049 ( -0.151321 0.145816 )
Epeak [keV] : 181.983 ( -49.3412 218.221 )
Norm@50keV : 8.529816E-03 ( -1.066222E-03 1.265907E-03) )
------------------------------------------------------------
Chi-Squared = 25.70932 using 59 PHA bins.
Reduced chi-squared = 0.4590950 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 230.3 sec: 0.859403 ( -0.022835 0.023251 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4823e-05 ( -1.37604e-07 2.76176e-07 ) ergs/cm2
Band function
Time interval is from -11.688 sec. to 218.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31951 ( -0.165651 0.170629 )
beta : -1.78234 ( -8.21766 0.176103 )
Epeak [keV] : 168.488 ( -56.5020 227.865 )
Norm@50keV : 8.724202E-03 ( -1.256742E-03 1.855150E-03) )
------------------------------------------------------------
Chi-Squared = 25.68187 using 59 PHA bins.
Reduced chi-squared = 0.4669431 for 55 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 230.3 sec: 0.858289 ( -0.023668 0.024182 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4811e-05 ( -2.75623e-07 2.73919e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 15.400 sec. to 16.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30931 ( -7.021487E-02 7.017648E-02) )
Norm@50keV : 6.082642E-02 ( -2.284132E-03 2.283931E-03) )
------------------------------------------------------------
Chi-Squared = 46.46093 using 59 PHA bins.
Reduced chi-squared = 0.8151041 for 57 degrees of freedom
Null hypothesis probability = 0.839
Photon flux (15-150 keV) in 1.000 sec: 7.26935 ( -0.29224 0.29291 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99711e-07 ( -2.4313e-08 2.4384e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.400 sec. to 16.400 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07692 ( -0.295675 0.264902 )
Epeak [keV] : 227.520 ( -95.9909 9772.48 )
Norm@50keV : 7.723196E-02 ( -1.714922E-02 2.653420E-02) )
------------------------------------------------------------
Chi-Squared = 44.41030 using 59 PHA bins.
but latest trial 6.223688E-02 gives Chi-Squared = 2.66611
Reduced chi-squared = 0.7930411 for 56 degrees of freedom
Null hypothesis probability = 0.868
Photon flux (15-150 keV) in 1.000 sec: 7.17547 ( -0.31104 0.30319 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.93822e-07 ( -2.5662e-08 2.5554e-08 ) ergs/cm2
Band function
Time interval is from 15.400 sec. to 16.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07672 ( -0.265062 0.295488 )
beta : -9.20280 ( -0.797198 7.92817 )
Epeak [keV] : 227.416 ( -95.9119 9772.58 )
Norm@50keV : 7.723783E-02 ( -1.735438E-02 2.652658E-02) )
------------------------------------------------------------
Chi-Squared = 44.41053 using 59 PHA bins.
Reduced chi-squared = 0.8074642 for 55 degrees of freedom
Null hypothesis probability = 0.846
Photon flux (15-150 keV) in 1.000 sec: 7.27413 ( -0.27212 0.2883 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.93391e-07 ( -2.5717e-08 2.5621e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 01:24:53 EST 2008