batgrbproduct Analysis for Trigger=158700
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 15:29:55 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger158700/GCN5_download_cron
======================================================================
Trigger: 00158700 Segment: 000
BAT Trigger Time: 150397242.528 [s; MET]
Trigger Stop: 150397242.912 [s; MET]
UTC: 2005-10-07T17:00:42.758000 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 115.891105785843 Dec: -0.512485921108127 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33409
Image Trigger?: NO
Rate S/N Ratio: 8.24621125123532 [ if not an image trigger ]
Image S/N Ratio: 33409
Flight Position: [ source = BAT ]
RA: 115.891105785843 Dec: -0.512485921108127 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 115.680281712132 Dec: -0.600583801051241 [deg; J2000]
{ 07h 42m 43.3s , -00d 36' 02.1" }
+/- 8.75548773826977 [arcmin] (estimated 90% radius based on SNR)
+/- 7.61623267573735 [arcmin] (formal 1-sigma fit error)
SNR: 1.37089313815661
RA = 7h 42m 43.3s (115.680282 deg.)
Dec = 0d 36' 2" (-0.600584 deg.)
Angular difference between Flight and Ground position is 13.708894 arcmin
Partial Coding Fraction: 1 [ 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 0.001367 -0.003274 0.003849 0.003230
0.002735 0.002898 0.002403 0.002220 [error]
Peak 0.001367 -0.003274 0.003849 0.003230
0.002735 0.002898 0.002403 0.002220 [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 2.45e-11 1.53e-10 8.73e-10 2.36e-08 2.92e-09 2.97e-08 erg/cm2
Error 6.45e-10 6.66e-10 1.47e-09 6.34e-08 4.32e-09 0.00e+00 erg/cm2
Peak flux Power-law 1.89e-03 6.48e-03 1.85e-02 1.63e-01 5.10e-02 1.86e-01 ph/cm2/s
Error 5.67e-02 3.06e-02 3.24e-02 3.95e-01 9.48e-02 4.10e-01 ph/cm2/s
Fluence Cutoff-PL 2.32e-11 1.52e-10 8.72e-10 2.36e-08 2.93e-09 1.97e-08 erg/cm2
Error 6.47e-10 6.66e-10 1.48e-09 6.96e-08 4.33e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.03e-03 7.20e-03 2.85e-02 5.87e-02 6.30e-02 8.78e-02 ph/cm2/s
Error 7.48e-02 2.92e-02 4.27e-02 5.64e-01 8.68e-02 4.27e-01 ph/cm2/s
Fluence Band 1.28e-10 2.64e-10 1.15e-09 5.54e-09 3.93e-09 4.89e-10 erg/cm2
Error 8.37e-08 4.96e-09 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.85e-03 6.45e-03 2.35e-02 5.83e-02 6.48e-02 1.91e-01 ph/cm2/s
Error 1.56e-02 2.54e-02 4.23e-02 4.59e-01 8.20e-02 4.41e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.562 6.500 - - 2.91e-04 8.25e-04 43.156 57
CPL 4.376 0.000 9991.8 0.0 3.92e-05 0.00e+00 43.675 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.562 6.500 - - 2.91e-04 8.25e-04 43.156 57
CPL 4.376 0.000 9991.8 0.0 3.92e-05 0.00e+00 43.675 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
115.6803 -0.6006 0.1411 11.2 -32.4 0.0068 1.4 TRIG_00158700
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-299.560 -181.448 (delta_t = 118.112 [sec])
-180.560 -2.560 (delta_t = 178.000 [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: -0.561682 ( -2.43832 10.5617 )
Norm@50keV : 2.905725E-04 ( -2.905726E-04 1.359565E-03) )
------------------------------------------------------------
Chi-Squared = 43.15618 using 59 PHA bins.
Reduced chi-squared = 0.7571260 for 57 degrees of freedom
Null hypothesis probability = 0.912
Photon flux (15-150 keV) in 0.3840 sec: 5.100033E-02 ( -0.0510003 0.138534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91661e-09 ( -2.91661e-09 5.72052e-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: 4.37603 ( )
Epeak [keV] : 9991.77 ( )
Norm@50keV : 3.919583E-05 ( )
------------------------------------------------------------
Chi-Squared = 43.67472 using 59 PHA bins.
Reduced chi-squared = 0.7799057 for 56 degrees of freedom
Null hypothesis probability = 0.885
Photon flux (15-150 keV) in 0.3840 sec: 6.297893E-02 ( -0.0629789 0.110686 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92782e-09 ( -2.92782e-09 5.73124e-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 : -0.272104 ( -9.72790 5.27210 )
beta : 0.550028 ( -10.5500 9.44997 )
Epeak [keV] : 24.5434 ( -24.4434 9975.46 )
Norm@50keV : 4.000009E-04 ( -4.000009E-04 923.215 )
------------------------------------------------------------
Chi-Squared = 43.15699 using 59 PHA bins.
Reduced chi-squared = 0.7846726 for 55 degrees of freedom
Null hypothesis probability = 0.876
Photon flux (15-150 keV) in 0.3840 sec: 6.479739E-02 ( -0.0647974 0.0991296 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92571e-09 ( -3.92571e-09 5.99604e-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: -0.561682 ( -2.43832 10.5617 )
Norm@50keV : 2.905725E-04 ( -2.905726E-04 1.359565E-03) )
------------------------------------------------------------
Chi-Squared = 43.15618 using 59 PHA bins.
Reduced chi-squared = 0.7571260 for 57 degrees of freedom
Null hypothesis probability = 0.912
Photon flux (15-150 keV) in 0.3840 sec: 5.100033E-02 ( -0.0510003 0.138534 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91661e-09 ( -2.91661e-09 5.72052e-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: 4.37603 ( )
Epeak [keV] : 9991.77 ( )
Norm@50keV : 3.919583E-05 ( )
------------------------------------------------------------
Chi-Squared = 43.67472 using 59 PHA bins.
Reduced chi-squared = 0.7799057 for 56 degrees of freedom
Null hypothesis probability = 0.885
Photon flux (15-150 keV) in 0.3840 sec: 6.297893E-02 ( -0.0629789 0.110686 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92782e-09 ( -2.92782e-09 5.73124e-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 : -0.272104 ( -9.72790 5.27210 )
beta : 0.550028 ( -10.5500 9.44997 )
Epeak [keV] : 24.5434 ( -24.4434 9975.46 )
Norm@50keV : 4.000009E-04 ( -4.000009E-04 923.215 )
------------------------------------------------------------
Chi-Squared = 43.15699 using 59 PHA bins.
Reduced chi-squared = 0.7846726 for 55 degrees of freedom
Null hypothesis probability = 0.876
Photon flux (15-150 keV) in 0.3840 sec: 6.479739E-02 ( -0.0647974 0.0991296 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.92571e-09 ( -3.92571e-09 5.99604e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 15:42:10 EST 2008