batgrbproduct Analysis for Trigger=180151
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): Mon Dec 31 10:38:21 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger180151/SDC
======================================================================
Trigger: 00180151 Segment: 000
BAT Trigger Time: 160703736 [s; MET]
Trigger Stop: 160703816 [s; MET]
UTC: 2006-02-03T23:55:35.005260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.51409528059 Dec: 71.8235796171824 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 103.51409528059 Dec: 71.8235796171824 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 103.448787675235 Dec: 71.8417176651195 [deg; J2000]
{ 06h 53m 47.7s , +71d 50' 30.2" }
+/- 1.95765003242686 [arcmin] (estimated 90% radius based on SNR)
+/- 0.978225909966176 [arcmin] (formal 1-sigma fit error)
SNR: 11.6507535157453
RA = 6h 53m 47.7s (103.448788 deg.)
Dec = 71d 50' 30" (71.841718 deg.)
Angular difference between Flight and Ground position is 1.636163 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 69.3799999952316 +/- 11.6669351586251
Measured from: -17.9679999947548
to: 51.4120000004768 [s; relative to TRIGTIME]
T50: 31.2199999988079 +/- 10.5688192507574
Measured from: -3.24399998784065
to: 27.9760000109673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 25.919999986887
to: 26.919999986887 [s; relative to TRIGTIME]
Total Fluence
Measured from: -22.1480000019073
to: 55.7360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.393790 0.471798 0.413260 0.164796
0.062479 0.063449 0.054632 0.046376 [error]
Peak 0.012683 0.028172 0.020217 0.005534
0.007312 0.007391 0.006119 0.005316 [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 1.35e-07 2.33e-07 3.07e-07 8.18e-07 8.98e-07 1.49e-06 erg/cm2
Error 3.12e-08 3.28e-08 5.30e-08 3.05e-07 1.28e-07 3.44e-07 erg/cm2
Peak flux Power-law 1.91e-01 1.97e-01 1.44e-01 1.68e-01 5.96e-01 6.99e-01 ph/cm2/s
Error 8.23e-02 6.75e-02 4.77e-02 1.14e-01 1.89e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 1.28e-07 2.42e-07 3.16e-07 5.29e-07 8.84e-07 1.17e-06 erg/cm2
Error 3.82e-08 4.05e-08 6.04e-08 4.88e-07 1.37e-07 5.13e-07 erg/cm2
Peak flux Cutoff-PL 1.59e-01 2.23e-01 1.57e-01 5.61e-02 5.81e-01 5.96e-01 ph/cm2/s
Error 1.13e-01 9.01e-02 6.21e-02 1.39e-01 1.91e-01 2.28e-01 ph/cm2/s
Fluence Band 1.26e-07 2.42e-07 3.12e-07 6.56e-07 8.82e-07 1.31e-06 erg/cm2
Error 3.59e-08 4.15e-08 5.87e-08 5.09e-07 1.02e-07 0.00e+00 erg/cm2
Peak flux Band 1.55e-01 2.34e-01 1.47e-01 1.12e-01 5.88e-01 6.43e-01 ph/cm2/s
Error 1.16e-01 8.72e-02 5.64e-02 1.30e-01 2.42e-01 2.30e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.606 0.234 - - 1.23e-03 1.66e-04 64.926 57
CPL 1.120 0.892 93.3 4989.9 2.13e-03 2.98e-03 64.706 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.456 0.493 - - 4.83e-03 1.42e-03 53.356 57
CPL 0.294 2.610 71.7 5000.0 1.94e-02 3.93e-01 52.560 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: 81.216000 sec.
T50 in the 50-300 keV band: 41.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 77.884 -22.148 55.736
T90 69.380 -17.968 51.412
T50 31.220 -3.244 27.976
Peak 1.000 25.920 26.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
103.4488 +71.8417 0.0165 43.2 -168.0 1.4712 11.7 TRIG_00180151
------------------------------------------
Foreground time interval of the image:
-22.148 55.736 (delta_t = 77.884 [sec])
Background time interval of the image:
-299.000 -22.148 (delta_t = 276.852 [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 -22.148 sec. to 55.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60647 ( -0.231925 0.235131 )
Norm@50keV : 1.233586E-03 ( -1.667694E-04 1.655149E-04) )
------------------------------------------------------------
Chi-Squared = 64.92645 using 59 PHA bins.
Reduced chi-squared = 1.139061 for 57 degrees of freedom
Null hypothesis probability = 0.220
Photon flux (15-150 keV) in 77.88 sec: 0.158841 ( -0.022034 0.022152 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.97723e-07 ( -1.27804e-07 1.28728e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.148 sec. to 55.736 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11988 ( -1.07306 0.711057 )
Epeak [keV] : 93.3166 ( -73.1519 9906.68 )
Norm@50keV : 2.129410E-03 ( -1.053527E-03 4.912184E-03) )
------------------------------------------------------------
Chi-Squared = 64.70621 using 59 PHA bins.
but latest trial 26.1966 gives Chi-Squared = 1.82997
Reduced chi-squared = 1.155468 for 56 degrees of freedom
Null hypothesis probability = 0.199
Photon flux (15-150 keV) in 77.88 sec: 0.156793 ( -0.023135 0.011438 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.84179e-07 ( -1.3883e-07 1.35293e-07 ) ergs/cm2
Band function
Time interval is from -22.148 sec. to 55.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.988200 ( -9.01180 2.98626 )
beta : -1.94174 ( -8.05826 0.547589 )
Epeak [keV] : 79.6060 ( -79.5060 9920.39 )
Norm@50keV : 2.548714E-03 ( -2.548714E-03 276.382 )
------------------------------------------------------------
Chi-Squared = 64.49054 using 59 PHA bins.
Reduced chi-squared = 1.172555 for 55 degrees of freedom
Null hypothesis probability = 0.179
Photon flux (15-150 keV) in 77.88 sec: 0.155846 ( -0.022739 0.023208 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.82186e-07 ( -6.9835e-08 1.33564e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 25.920 sec. to 26.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45603 ( -0.507558 0.478207 )
Norm@50keV : 4.832317E-03 ( -1.423174E-03 1.423191E-03) )
------------------------------------------------------------
Chi-Squared = 53.35558 using 59 PHA bins.
Reduced chi-squared = 0.9360628 for 57 degrees of freedom
Null hypothesis probability = 0.613
Photon flux (15-150 keV) in 1.000 sec: 0.596391 ( -0.187779 0.190527 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61792e-08 ( -1.40662e-08 1.42348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.920 sec. to 26.920 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.293743 ( -3.29374 1.92656 )
Epeak [keV] : 71.6882 ( -71.6782 9928.31 )
Norm@50keV : 1.940324E-02 ( -1.940324E-02 0.766193 )
------------------------------------------------------------
Chi-Squared = 52.56002 using 59 PHA bins.
but latest trial 2.22030 gives Chi-Squared = 2.08496
Reduced chi-squared = 0.9385718 for 56 degrees of freedom
Null hypothesis probability = 0.606
Photon flux (15-150 keV) in 1.000 sec: 0.580540 ( -0.188606 0.192463 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.31291e-08 ( -1.56348e-08 1.55812e-08 ) ergs/cm2
Band function
Time interval is from 25.920 sec. to 26.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.791302 ( -10.7913 4.20870 )
beta : -1.87539 ( -8.12461 0.755485 )
Epeak [keV] : 47.5255 ( -47.4255 9952.47 )
Norm@50keV : 0.105782 ( -30.1903 14.5686 )
------------------------------------------------------------
Chi-Squared = 51.70743 using 59 PHA bins.
Reduced chi-squared = 0.9401351 for 55 degrees of freedom
Null hypothesis probability = 0.601
Photon flux (15-150 keV) in 1.000 sec: 0.587649 ( -0.190273 0.293792 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48838e-08 ( -1.52383e-08 1.40419e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 10:46:12 EST 2007