batgrbproduct Analysis for Trigger=160672
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 9 17:08:22 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger160672/SDC
======================================================================
Trigger: 00160672 Segment: 000
BAT Trigger Time: 151630313.472 [s; MET]
Trigger Stop: 151630314.496 [s; MET]
UTC: 2005-10-21T23:31:53.676000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.037109457011 Dec: -45.5194340356682 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.77
Image Trigger?: NO
Rate S/N Ratio: 12.8062484748657 [ if not an image trigger ]
Image S/N Ratio: 6.77
Flight Position: [ source = BAT ]
RA: 126.037109457011 Dec: -45.5194340356682 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.064324164865 Dec: -45.5330407816398 [deg; J2000]
{ 08h 24m 15.4s , -45d 31' 58.9" }
+/- 1.31530998733956 [arcmin] (estimated 90% radius based on SNR)
+/- 0.420589774427041 [arcmin] (formal 1-sigma fit error)
SNR: 20.5626087288393
RA = 8h 24m 15.4s (126.064324 deg.)
Dec = -45d 31' 59" (-45.533041 deg.)
Angular difference between Flight and Ground position is 1.405412 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 46.4159999787807 +/- 11.5088167840115
Measured from: -3.13600000739098
to: 43.2799999713898 [s; relative to TRIGTIME]
T50: 19.1839999854565 +/- 5.72149351346549
Measured from: 0.879999995231628
to: 20.0639999806881 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.668000012636185
to: 0.331999987363815 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.64000001549721
to: 54.6719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.382616 0.542222 0.423473 0.080533
0.038315 0.039340 0.035398 0.032604 [error]
Peak 0.027793 0.035511 0.023935 0.008910
0.005291 0.005713 0.005179 0.004637 [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 1.28e-07 2.28e-07 3.10e-07 8.69e-07 8.97e-07 1.54e-06 erg/cm2
Error 1.75e-08 1.92e-08 3.44e-08 2.04e-07 8.26e-08 2.32e-07 erg/cm2
Peak flux Power-law 2.40e-01 2.55e-01 1.93e-01 2.37e-01 7.78e-01 9.25e-01 ph/cm2/s
Error 7.82e-02 4.88e-02 4.38e-02 1.17e-01 1.37e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-07 2.52e-07 3.25e-07 2.49e-07 8.34e-07 9.34e-07 erg/cm2
Error 2.16e-08 2.48e-08 4.00e-08 1.96e-07 9.07e-08 2.12e-07 erg/cm2
Peak flux Cutoff-PL 2.40e-01 2.55e-01 1.93e-01 2.35e-01 7.78e-01 9.23e-01 ph/cm2/s
Error 7.82e-02 4.88e-02 4.38e-02 1.17e-01 1.37e-01 1.66e-01 ph/cm2/s
Fluence Band 1.07e-07 2.51e-07 3.25e-07 2.49e-07 8.33e-07 9.31e-07 erg/cm2
Error 2.14e-08 2.47e-08 3.99e-08 1.94e-07 9.05e-08 2.12e-07 erg/cm2
Peak flux Band 2.29e-01 2.52e-01 1.94e-01 2.42e-01 7.77e-01 9.35e-01 ph/cm2/s
Error 5.20e-02 4.36e-02 3.70e-02 9.05e-02 1.34e-01 1.61e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.558 0.143 - - 1.61e-03 1.36e-04 59.083 57
CPL 0.538 0.708 70.6 26.0 5.30e-03 6.29e-03 51.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.405 0.337 - - 6.38e-03 1.13e-03 47.254 57
CPL 1.402 0.340 9987.8 5000.0 6.40e-03 1.13e-03 47.263 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: 12.928000 sec.
T50 in the 50-300 keV band: 6.720000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 59.312 -4.640 54.672
T90 46.416 -3.136 43.280
T50 19.184 0.880 20.064
Peak 1.000 -0.668 0.332
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.0643 -45.5330 0.0094 27.3 -18.7 0.9743 20.6 TRIG_00160672
------------------------------------------
Foreground time interval of the image:
-4.640 14.429 (delta_t = 19.069 [sec])
Background time interval of the image:
-299.472 -4.640 (delta_t = 294.832 [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 -4.640 sec. to 54.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55781 ( -0.141801 0.143526 )
Norm@50keV : 1.608008E-03 ( -1.363675E-04 1.353556E-04) )
------------------------------------------------------------
Chi-Squared = 59.08289 using 59 PHA bins.
Reduced chi-squared = 1.036542 for 57 degrees of freedom
Null hypothesis probability = 0.399
Photon flux (15-150 keV) in 59.31 sec: 0.204025 ( -0.016892 0.016916 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.96951e-07 ( -8.23579e-08 8.28976e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.640 sec. to 54.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.537622 ( -0.764781 0.650788 )
Epeak [keV] : 70.6297 ( -12.6929 39.2895 )
Norm@50keV : 5.297191E-03 ( -5.297191E-03 7.292272E-03) )
------------------------------------------------------------
Chi-Squared = 51.35028 using 59 PHA bins.
Reduced chi-squared = 0.9169693 for 56 degrees of freedom
Null hypothesis probability = 0.651
Photon flux (15-150 keV) in 59.31 sec: 0.194833 ( -0.017981 0.017894 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33922e-07 ( -8.96233e-08 9.18178e-08 ) ergs/cm2
Band function
Time interval is from -4.640 sec. to 54.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.544130 ( -0.644972 0.526391 )
beta : -9.13351 ( -0.866491 7.26664 )
Epeak [keV] : 70.7604 ( -12.8374 39.1646 )
Norm@50keV : 5.257438E-03 ( -5.257438E-03 7.337620E-03) )
------------------------------------------------------------
Chi-Squared = 51.35079 using 59 PHA bins.
Reduced chi-squared = 0.9336507 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 59.31 sec: 0.194877 ( -0.017998 0.017871 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33448e-07 ( -8.95047e-08 9.15924e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.672 sec. to 0.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40514 ( -0.334731 0.340261 )
Norm@50keV : 6.382161E-03 ( -1.134662E-03 1.119184E-03) )
------------------------------------------------------------
Chi-Squared = 47.25362 using 59 PHA bins.
Reduced chi-squared = 0.8290109 for 57 degrees of freedom
Null hypothesis probability = 0.818
Photon flux (15-150 keV) in 1.008 sec: 0.778133 ( -0.136662 0.137072 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.21314e-08 ( -1.24524e-08 1.25693e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.672 sec. to 0.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40234 ( -0.336849 0.342227 )
Epeak [keV] : 9987.83 ( -9987.82 12.1660 )
Norm@50keV : 6.404708E-03 ( -1.142778E-03 1.125559E-03) )
------------------------------------------------------------
Chi-Squared = 47.26278 using 59 PHA bins.
Reduced chi-squared = 0.8439781 for 56 degrees of freedom
Null hypothesis probability = 0.791
Photon flux (15-150 keV) in 1.008 sec: 0.777849 ( -0.136619 0.137027 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20972e-08 ( -1.24178e-08 1.2615e-08 ) ergs/cm2
Band function
Time interval is from -0.672 sec. to 0.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14207 ( -8.85793 3.08768 )
beta : -1.40498 ( -8.59502 0.334575 )
Epeak [keV] : 32.4940 ( -32.3940 9967.51 )
Norm@50keV : 1.269157E-02 ( -1.269157E-02 114.153 )
------------------------------------------------------------
Chi-Squared = 47.25363 using 59 PHA bins.
Reduced chi-squared = 0.8591568 for 55 degrees of freedom
Null hypothesis probability = 0.762
Photon flux (15-150 keV) in 1.008 sec: 0.776821 ( -0.134002 0.13355 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20339e-08 ( -1.24074e-08 1.26178e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 17:18:40 EST 2008