batgrbproduct Analysis for Trigger=153466
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): Thu Jan 10 19:03:54 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger153466/SDC
======================================================================
Trigger: 00153466 Segment: 000
BAT Trigger Time: 147476232 [s; MET]
Trigger Stop: 147476296 [s; MET]
UTC: 2005-09-03T21:37:12.290320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.9121038484506 Dec: 14.9676424840988 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.75
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.75
Flight Position: [ source = BAT ]
RA: 76.9121038484506 Dec: 14.9676424840988 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.9091980367453 Dec: 14.9498438096586 [deg; J2000]
{ 05h 07m 38.2s , +14d 56' 59.4" }
+/- 1.47084153510103 [arcmin] (estimated 90% radius based on SNR)
+/- 2.5192059795197 [arcmin] (formal 1-sigma fit error)
SNR: 17.5282493896147
RA = 5h 7m 38.2s (76.909198 deg.)
Dec = 14d 56' 59" (14.949844 deg.)
Angular difference between Flight and Ground position is 1.081123 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 78.4799999892712 +/- 17.5519799472907
Measured from: -14.4519999921322
to: 64.027999997139 [s; relative to TRIGTIME]
T50: 31.6840000152588 +/- 4.22570609761023
Measured from: 12.7599999904633
to: 44.444000005722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.9880000054836
to: 32.9880000054836 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.6399999856949
to: 74.9839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.072348 0.967910 0.385750 0.068833
0.050995 0.050983 0.044059 0.040432 [error]
Peak 0.025396 0.018655 0.011248 0.004794
0.005086 0.004954 0.004362 0.003937 [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 3.14e-07 3.86e-07 3.44e-07 5.32e-07 1.23e-06 1.57e-06 erg/cm2
Error 3.17e-08 2.52e-08 4.20e-08 1.31e-07 9.28e-08 1.74e-07 erg/cm2
Peak flux Power-law 2.00e-01 1.57e-01 8.26e-02 6.31e-02 4.68e-01 5.03e-01 ph/cm2/s
Error 6.68e-02 3.85e-02 3.39e-02 4.99e-02 1.14e-01 1.27e-01 ph/cm2/s
Fluence Cutoff-PL 3.10e-07 3.91e-07 3.41e-07 4.13e-07 1.21e-06 1.44e-06 erg/cm2
Error 3.51e-08 2.98e-08 3.38e-08 2.60e-07 1.14e-07 3.00e-07 erg/cm2
Peak flux Cutoff-PL 1.97e-01 1.69e-01 7.74e-02 2.32e-02 4.60e-01 4.66e-01 ph/cm2/s
Error 6.96e-02 5.51e-02 5.85e-02 6.03e-02 1.15e-01 1.61e-01 ph/cm2/s
Fluence Band 3.01e-07 3.97e-07 3.32e-07 4.49e-07 1.20e-06 1.49e-06 erg/cm2
Error 3.65e-08 3.44e-08 4.91e-08 3.21e-07 1.09e-07 2.69e-07 erg/cm2
Peak flux Band 1.99e-01 1.73e-01 7.53e-02 4.39e-02 4.68e-01 4.91e-01 ph/cm2/s
Error 8.28e-02 5.14e-02 3.80e-02 4.49e-02 1.14e-01 1.30e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.164 0.140 - - 1.24e-03 1.07e-04 44.352 57
CPL 1.994 0.000 1.3 13.4 1.58e-03 1.79e-04 44.274 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.925 0.457 - - 3.23e-03 1.02e-03 45.398 57
CPL 1.321 2.523 41.3 5000.0 7.80e-03 2.10e+00 45.125 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: 65.344000 sec.
T50 in the 50-300 keV band: 32.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 105.624 -30.640 74.984
T90 78.480 -14.452 64.028
T50 31.684 12.760 44.444
Peak 1.000 31.988 32.988
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.9092 +14.9498 0.0109 2.0 57.8 3.3362 17.5 TRIG_00153466
------------------------------------------
Foreground time interval of the image:
-30.640 74.205 (delta_t = 104.845 [sec])
Background time interval of the image:
-60.000 -30.640 (delta_t = 29.360 [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 -30.640 sec. to 74.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16380 ( -0.137886 0.142163 )
Norm@50keV : 1.242884E-03 ( -1.075154E-04 1.058003E-04) )
------------------------------------------------------------
Chi-Squared = 44.35246 using 59 PHA bins.
Reduced chi-squared = 0.7781133 for 57 degrees of freedom
Null hypothesis probability = 0.889
Photon flux (15-150 keV) in 105.6 sec: 0.201927 ( -0.01352 0.013559 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22808e-06 ( -9.2136e-08 9.35088e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.640 sec. to 74.984 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.99399 ( )
Epeak [keV] : 1.31770 ( -0.725521 25.9953 )
Norm@50keV : 1.583172E-03 ( -2.207113E-04 1.381050E-04) )
------------------------------------------------------------
Chi-Squared = 44.27405 using 59 PHA bins.
but latest trial 47.1411 gives Chi-Squared = 3.97136
but latest trial 1.775702E-03 gives Chi-Squared = 10.1248
Reduced chi-squared = 0.7906080 for 56 degrees of freedom
Null hypothesis probability = 0.871
Photon flux (15-150 keV) in 105.6 sec: 0.200464 ( -0.014894 0.014568 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20992e-06 ( -1.2182e-07 1.06234e-07 ) ergs/cm2
Band function
Time interval is from -30.640 sec. to 74.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.86380 ( -8.13620 6.86380 )
beta : -9.19619 ( -7.72667 0.228333 )
Epeak [keV] : 18.8362 ( -17.2294 19.9054 )
Norm@50keV : 1.842204E-03 ( -4.435008E-04 657.932 )
------------------------------------------------------------
Chi-Squared = 44.45963 using 59 PHA bins.
Reduced chi-squared = 0.8083569 for 55 degrees of freedom
Null hypothesis probability = 0.844
Photon flux (15-150 keV) in 105.6 sec: 0.198789 ( -0.014773 0.014685 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19734e-06 ( -1.0842e-07 1.08905e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 31.988 sec. to 32.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92522 ( -0.435081 0.478181 )
Norm@50keV : 3.228752E-03 ( -1.035933E-03 9.958015E-04) )
------------------------------------------------------------
Chi-Squared = 45.39761 using 59 PHA bins.
Reduced chi-squared = 0.7964492 for 57 degrees of freedom
Null hypothesis probability = 0.866
Photon flux (15-150 keV) in 1.000 sec: 0.468367 ( -0.114187 0.114194 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96787e-08 ( -8.8427e-09 9.4466e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.988 sec. to 32.988 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32129 ( -4.23496 0.811106 )
Epeak [keV] : 41.2692 ( -41.2592 9958.73 )
Norm@50keV : 7.797058E-03 ( -7.797058E-03 4.19067 )
------------------------------------------------------------
Chi-Squared = 45.12507 using 59 PHA bins.
but latest trial 2.13240 gives Chi-Squared = 0.514946
Reduced chi-squared = 0.8058048 for 56 degrees of freedom
Null hypothesis probability = 0.851
Photon flux (15-150 keV) in 1.000 sec: 0.459906 ( -0.118004 0.111833 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71926e-08 ( -1.08348e-08 1.11606e-08 ) ergs/cm2
Band function
Time interval is from 31.988 sec. to 32.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36489 ( -13.1824 1.81760 )
beta : -9.31131 ( -1.30842 0.823158 )
Epeak [keV] : 41.6812 ( -26.2497 82.1570 )
Norm@50keV : 7.325756E-03 ( -309.353 142.780 )
------------------------------------------------------------
Chi-Squared = 45.12558 using 59 PHA bins.
Reduced chi-squared = 0.8204651 for 55 degrees of freedom
Null hypothesis probability = 0.826
Photon flux (15-150 keV) in 1.000 sec: 0.468457 ( -0.115213 0.113741 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81653e-08 ( -4.3278e-09 9.0809e-09 ) ergs/cm2
Plot creation:
Thu Jan 10 19:12:05 EST 2008