batgrbproduct Analysis for Trigger=291614
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): Fri Dec 14 13:59:14 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger291614/GCN5_download_cron
======================================================================
Trigger: 00291614 Segment: 000
BAT Trigger Time: 211953616 [s; MET]
Trigger Stop: 211953680 [s; MET]
UTC: 2007-09-20T04:00:13.763940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 100.932293960004 Dec: 72.2273663433026 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.26
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.26
Flight Position: [ source = BAT ]
RA: 100.932293960004 Dec: 72.2273663433026 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 100.986790552396 Dec: 72.2429629068369 [deg; J2000]
{ 06h 43m 56.8s , +72d 14' 34.7" }
+/- 1.91740032454281 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24610473721573 [arcmin] (formal 1-sigma fit error)
SNR: 12.0017052398514
RA = 6h 43m 56.8s (100.986791 deg.)
Dec = 72d 14' 35" (72.242963 deg.)
Angular difference between Flight and Ground position is 1.367851 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 56.0839999914169 +/- 4.61103025983879
Measured from: 16.8600000143051
to: 72.944000005722 [s; relative to TRIGTIME]
T50: 35.0880000293255 +/- 11.6057089446857
Measured from: 24.2599999904633
to: 59.3480000197887 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.4519999921322
to: 31.4519999921322 [s; relative to TRIGTIME]
Total Fluence
Measured from: 15.108000010252
to: 74.9920000135899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.291232 0.354114 0.201006 0.024969
0.034533 0.035138 0.030715 0.026481 [error]
Peak 0.010930 0.017618 0.011072 0.003834
0.004546 0.004531 0.004016 0.003408 [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 8.43e-08 1.38e-07 1.72e-07 4.24e-07 5.14e-07 8.17e-07 erg/cm2
Error 1.52e-08 1.58e-08 3.01e-08 1.55e-07 7.01e-08 1.82e-07 erg/cm2
Peak flux Power-law 1.36e-01 1.19e-01 7.17e-02 6.51e-02 3.55e-01 3.92e-01 ph/cm2/s
Error 5.93e-02 3.53e-02 3.23e-02 5.84e-02 1.05e-01 1.20e-01 ph/cm2/s
Fluence Cutoff-PL 8.15e-08 1.43e-07 1.73e-07 2.63e-07 5.01e-07 6.34e-07 erg/cm2
Error 1.71e-08 2.03e-08 3.14e-08 2.89e-07 7.76e-08 2.70e-07 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 8.06e-08 1.43e-07 1.70e-07 3.59e-07 5.03e-07 7.53e-07 erg/cm2
Error 1.68e-08 2.15e-08 3.43e-08 2.31e-07 7.95e-08 2.45e-07 erg/cm2
Peak flux Band 1.26e-01 1.29e-01 7.43e-02 3.15e-02 3.49e-01 3.60e-01 ph/cm2/s
Error 6.73e-02 4.51e-02 3.75e-02 6.60e-02 1.06e-01 1.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.686 0.212 - - 9.26e-04 1.18e-04 37.429 57
CPL 1.206 0.851 76.8 0.0 1.67e-03 2.04e-03 37.166 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.733 0.551 - - 2.64e-03 9.21e-04 63.261 57
CPL 0.986 0.000 62.3 0.0 6.72e-03 0.00e+00 62.923 56
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: 16.128000 sec.
T50 in the 50-300 keV band: 8.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 59.884 15.108 74.992
T90 56.084 16.860 72.944
T50 35.088 24.260 59.348
Peak 1.000 30.452 31.452
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.9868 +72.2430 0.0160 14.4 -153.5 0.8380 12.0 TRIG_00291614
------------------------------------------
Foreground time interval of the image:
15.108 74.992 (delta_t = 59.884 [sec])
Background time interval of the image:
-239.000 15.108 (delta_t = 254.108 [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 15.108 sec. to 74.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68606 ( -0.208219 0.214975 )
Norm@50keV : 9.258174E-04 ( -1.194764E-04 1.170317E-04) )
------------------------------------------------------------
Chi-Squared = 37.42879 using 59 PHA bins.
Reduced chi-squared = 0.6566455 for 57 degrees of freedom
Null hypothesis probability = 0.979
Photon flux (15-150 keV) in 59.88 sec: 0.122366 ( -0.014016 0.014024 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13892e-07 ( -6.94901e-08 7.07548e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.108 sec. to 74.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20645 ( -0.734723 0.967867 )
Epeak [keV] : 76.8416 ( )
Norm@50keV : 1.674246E-03 ( -1.123218E-03 2.952329E-03) )
------------------------------------------------------------
Chi-Squared = 37.16630 using 59 PHA bins.
Reduced chi-squared = 0.6636839 for 56 degrees of freedom
Null hypothesis probability = 0.975
Photon flux (15-150 keV) in 59.88 sec: 0.120978 ( -0.007274 0.014433 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0116e-07 ( -7.8068e-08 7.70674e-08 ) ergs/cm2
Band function
Time interval is from 15.108 sec. to 74.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.28434 ( -8.71566 0.403792 )
beta : -8.19321 ( -1.80679 6.70091 )
Epeak [keV] : 82.7633 ( -82.6633 9917.24 )
Norm@50keV : 1.521635E-03 ( -7.060547E-04 2.541180E-03) )
------------------------------------------------------------
Chi-Squared = 37.06792 using 59 PHA bins.
Reduced chi-squared = 0.6739622 for 55 degrees of freedom
Null hypothesis probability = 0.970
Photon flux (15-150 keV) in 59.88 sec: 0.120981 ( -0.01451 0.014463 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03481e-07 ( -8.2356e-08 7.66177e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 30.452 sec. to 31.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73330 ( -0.515340 0.586732 )
Norm@50keV : 2.640606E-03 ( -9.485835E-04 8.926929E-04) )
------------------------------------------------------------
Chi-Squared = 63.26108 using 59 PHA bins.
Reduced chi-squared = 1.109843 for 57 degrees of freedom
Null hypothesis probability = 0.265
Photon flux (15-150 keV) in 1.000 sec: 0.354869 ( -0.104757 0.104772 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4388e-08 ( -8.6047e-09 9.0808e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.452 sec. to 31.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986217 ( )
Epeak [keV] : 62.3420 ( )
Norm@50keV : 6.724202E-03 ( )
------------------------------------------------------------
Chi-Squared = 62.92313 using 59 PHA bins.
Reduced chi-squared = 1.123627 for 56 degrees of freedom
Null hypothesis probability = 0.245
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 30.452 sec. to 31.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09286 ( -8.90714 1.42028 )
beta : -8.17675 ( -1.82325 6.92390 )
Epeak [keV] : 65.2635 ( -39.4037 9934.74 )
Norm@50keV : 5.892760E-03 ( -5.892760E-03 0.225790 )
------------------------------------------------------------
Chi-Squared = 62.91430 using 59 PHA bins.
Reduced chi-squared = 1.143896 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 1.000 sec: 0.348819 ( -0.106214 0.106124 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33115e-08 ( -4.3876e-09 9.558e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 14:26:33 EST 2007