batgrbproduct Analysis for Trigger=162616
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 17:32:07 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger162616/GCN5_download_cron
======================================================================
Trigger: 00162616 Segment: 000
BAT Trigger Time: 152898544.608 [s; MET]
Trigger Stop: 152898544.992 [s; MET]
UTC: 2005-11-05T15:49:04.785120 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 170.353324999869 Dec: -59.9885924265049 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33332
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 33332
Flight Position: [ source = BAT ]
RA: 170.353324999869 Dec: -59.9885924265049 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.328452926362 Dec: -59.9517124155436 [deg; J2000]
{ 11h 21m 18.8s , -59d 57' 06.2" }
+/- 5.72893706084796 [arcmin] (estimated 90% radius based on SNR)
+/- 3.44221920926795 [arcmin] (formal 1-sigma fit error)
SNR: 2.51278568877863
RA = 11h 21m 18.8s (170.328453 deg.)
Dec = -59d 57' 6" (-59.951712 deg.)
Angular difference between Flight and Ground position is 2.335433 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006401 0.001669 0.003287 0.004487
0.003626 0.003700 0.003194 0.003103 [error]
Peak 0.006401 0.001669 0.003287 0.004487
0.003626 0.003700 0.003194 0.003103 [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 1.30e-09 8.96e-10 4.08e-10 2.61e-10 2.74e-09 2.91e-09 erg/cm2
Error 1.53e-09 1.33e-09 1.46e-09 2.65e-08 4.34e-09 2.68e-08 erg/cm2
Peak flux Power-law 1.14e-01 4.50e-02 9.83e-03 2.75e-03 1.69e-01 1.72e-01 ph/cm2/s
Error 1.34e-01 6.30e-02 3.37e-02 1.58e-01 2.01e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.30e-09 9.04e-10 4.09e-10 2.60e-10 2.75e-09 2.89e-09 erg/cm2
Error 1.53e-09 1.33e-09 1.46e-09 2.93e-08 4.34e-09 2.97e-08 erg/cm2
Peak flux Cutoff-PL 1.13e-01 4.42e-02 1.01e-02 2.75e-03 1.69e-01 1.70e-01 ph/cm2/s
Error 1.34e-01 6.31e-02 3.37e-02 1.80e-01 2.01e-01 2.05e-01 ph/cm2/s
Fluence Band 1.66e-09 1.01e-09 6.79e-11 3.66e-12 2.76e-09 3.89e-09 erg/cm2
Error 1.78e-09 1.38e-09 1.23e-09 9.22e-09 3.89e-09 0.00e+00 erg/cm2
Peak flux Band 1.50e-01 5.17e-02 9.48e-04 1.16e-05 2.02e-01 1.97e-01 ph/cm2/s
Error 1.56e-01 7.60e-02 2.67e-02 3.92e-02 2.08e-01 2.08e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.977 6.500 - - 6.34e-04 1.23e-03 85.470 57
CPL -0.849 0.000 17.0 5000.0 6.87e-01 3.05e+02 85.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.977 6.500 - - 6.34e-04 1.23e-03 85.470 57
CPL -0.849 0.000 17.0 5000.0 6.87e-01 3.05e+02 85.050 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.3285 -59.9517 0.0769 35.7 -12.6 0.0197 2.5 TRIG_00162616
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-10.640 -8.640 (delta_t = 2.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97712 ( -5.97712 7.02288 )
Norm@50keV : 6.344223E-04 ( -6.344223E-04 1.825460E-03) )
------------------------------------------------------------
Chi-Squared = 85.46976 using 59 PHA bins.
Reduced chi-squared = 1.499469 for 57 degrees of freedom
Null hypothesis probability = 8.671E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.169054 ( -0.169054 0.233924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74101e-09 ( -2.74101e-09 5.93434e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.849158 ( )
Epeak [keV] : 16.9813 ( -19.8105 9980.18 )
Norm@50keV : 0.686983 ( -32.7200 577.346 )
------------------------------------------------------------
Chi-Squared = 85.04957 using 59 PHA bins.
Reduced chi-squared = 1.518742 for 56 degrees of freedom
Null hypothesis probability = 7.399E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.168961 ( -0.168961 0.233904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74716e-09 ( -2.74716e-09 5.92931e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73598 ( -8.26402 6.73598 )
beta : -9.15852 ( -0.841479 19.1585 )
Epeak [keV] : 4.94416 ( -4.84416 9995.06 )
Norm@50keV : 6.450182E-03 ( -6.450182E-03 111882. )
------------------------------------------------------------
Chi-Squared = 85.31079 using 59 PHA bins.
Reduced chi-squared = 1.551105 for 55 degrees of freedom
Null hypothesis probability = 5.471E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.202373 ( -0.202373 0.213926 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75594e-09 ( -2.75594e-09 5.01496e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97712 ( -5.97712 7.02288 )
Norm@50keV : 6.344223E-04 ( -6.344223E-04 1.825460E-03) )
------------------------------------------------------------
Chi-Squared = 85.46976 using 59 PHA bins.
Reduced chi-squared = 1.499469 for 57 degrees of freedom
Null hypothesis probability = 8.671E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.169054 ( -0.169054 0.233924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74101e-09 ( -2.74101e-09 5.93434e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.849158 ( )
Epeak [keV] : 16.9813 ( -19.8105 9980.18 )
Norm@50keV : 0.686983 ( -32.7200 577.346 )
------------------------------------------------------------
Chi-Squared = 85.04957 using 59 PHA bins.
Reduced chi-squared = 1.518742 for 56 degrees of freedom
Null hypothesis probability = 7.399E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.168961 ( -0.168961 0.233904 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74716e-09 ( -2.74716e-09 5.92931e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73598 ( -8.26402 6.73598 )
beta : -9.15852 ( -0.841479 19.1585 )
Epeak [keV] : 4.94416 ( -4.84416 9995.06 )
Norm@50keV : 6.450182E-03 ( -6.450182E-03 111882. )
------------------------------------------------------------
Chi-Squared = 85.31079 using 59 PHA bins.
Reduced chi-squared = 1.551105 for 55 degrees of freedom
Null hypothesis probability = 5.471E-03
Photon flux (15-150 keV) in 0.3840 sec: 0.202373 ( -0.202373 0.213926 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75594e-09 ( -2.75594e-09 5.01496e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 17:36:39 EST 2008