batgrbproduct Analysis for Trigger=154073
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): Tue Jan 8 20:04:20 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger154073/GCN5_download_cron
======================================================================
Trigger: 00154073 Segment: 000
BAT Trigger Time: 147835229.408 [s; MET]
Trigger Stop: 147835229.792 [s; MET]
UTC: 2005-09-08T01:20:29.691060 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 132.143904066368 Dec: 26.3658212546949 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33414
Image Trigger?: NO
Rate S/N Ratio: 8.77496438739212 [ if not an image trigger ]
Image S/N Ratio: 33414
Flight Position: [ source = BAT ]
RA: 132.143904066368 Dec: 26.3658212546949 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.357057089267 Dec: 26.3274345975994 [deg; J2000]
{ 08h 49m 25.7s , +26d 19' 38.8" }
+/- 11.3532583437198 [arcmin] (estimated 90% radius based on SNR)
+/- 12.4891903913759 [arcmin] (formal 1-sigma fit error)
SNR: 0.945808800983632
RA = 8h 49m 25.7s (132.357057 deg.)
Dec = 26d 19' 39" (26.327435 deg.)
Angular difference between Flight and Ground position is 11.689851 arcmin
Partial Coding Fraction: 0.9375 [ 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 0.001692 -0.002396 0.003084 -0.000377
0.002756 0.002817 0.002482 0.002175 [error]
Peak 0.001692 -0.002396 0.003084 -0.000377
0.002756 0.002817 0.002482 0.002175 [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 4.93e-11 2.85e-11 1.15e-11 5.26e-12 9.33e-11 9.52e-11 erg/cm2
Error 5.99e-10 6.07e-10 9.67e-10 2.74e-08 2.63e-09 2.77e-08 erg/cm2
Peak flux Power-law 4.35e-03 1.40e-03 2.59e-04 5.77e-05 6.14e-03 3.60e-03 ph/cm2/s
Error 5.24e-02 2.84e-02 2.18e-02 1.70e-01 8.51e-02 1.76e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-11 1.24e-10 4.67e-10 4.24e-10 9.01e-10 9.65e-10 erg/cm2
Error 7.62e-10 7.25e-10 1.56e-09 3.89e-08 3.08e-09 2.38e-08 erg/cm2
Peak flux Cutoff-PL 1.04e-03 5.30e-03 1.05e-02 5.10e-03 2.08e-02 1.74e-02 ph/cm2/s
Error 6.59e-02 3.24e-02 3.52e-02 2.32e-01 8.37e-02 1.85e-01 ph/cm2/s
Fluence Band 0.00e+00 4.71e-11 4.16e-12 3.95e-10 1.25e-09 0.00e+00 erg/cm2
Error 3.14e-10 1.06e-09 2.46e-08 3.03e-09 2.54e-08 0.00e+00 erg/cm2
Peak flux Band 4.18e-04 4.75e-03 1.59e-02 8.01e-03 2.84e-02 2.91e-02 ph/cm2/s
Error 3.42e-02 3.17e-02 3.85e-02 2.26e-01 7.01e-02 1.68e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.400 6.500 - - 1.64e-05 6.62e-04 67.613 57
CPL 0.730 0.000 122.5 5000.0 4.69e-05 5.00e+23 67.617 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.400 6.500 - - 1.64e-05 6.62e-04 67.613 57
CPL 0.730 0.000 122.5 5000.0 4.69e-05 5.00e+23 67.617 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
132.3571 +26.3274 0.2033 18.0 -138.1 0.0049 0.9 TRIG_00154073
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-60.440 -51.680 (delta_t = 8.760 [sec])
-50.440 -5.440 (delta_t = 45.000 [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: 3.39952 ( -6.39952 6.60048 )
Norm@50keV : 1.644026E-05 ( -1.644026E-05 1.307202E-03) )
------------------------------------------------------------
Chi-Squared = 67.61283 using 59 PHA bins.
Reduced chi-squared = 1.186190 for 57 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 0.3840 sec: 6.137144E-03 ( -0.00613714 0.164124 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32532e-11 ( -9.32532e-11 5.16234e-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: 0.729845 ( )
Epeak [keV] : 122.498 ( -100.926 9899.06 )
Norm@50keV : 4.691102E-05 ( -2.800511E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 67.61662 using 59 PHA bins.
Reduced chi-squared = 1.207440 for 56 degrees of freedom
Null hypothesis probability = 0.137
Photon flux (15-150 keV) in 0.3840 sec: 2.075754E-02 ( -0.0207575 0.146628 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00641e-10 ( -9.00641e-10 5.2565e-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 : 4.38543 ( -14.9987 1.344681E-03) )
beta : -9.23669 ( -0.628597 19.3714 )
Epeak [keV] : 99.9674 ( -87.1313 9912.77 )
Norm@50keV : 8.776262E-03 ( -2.256800E-02 2.063461E+07) )
------------------------------------------------------------
Chi-Squared = 67.44878 using 59 PHA bins.
Reduced chi-squared = 1.226341 for 55 degrees of freedom
Null hypothesis probability = 0.121
Photon flux (15-150 keV) in 0.3840 sec: 2.844330E-02 ( -0.0284433 0.11177 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24977e-09 ( -1.24977e-09 4.81083e-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: 3.39952 ( -6.39952 6.60048 )
Norm@50keV : 1.644026E-05 ( -1.644026E-05 1.307202E-03) )
------------------------------------------------------------
Chi-Squared = 67.61283 using 59 PHA bins.
Reduced chi-squared = 1.186190 for 57 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 0.3840 sec: 6.137144E-03 ( -0.00613714 0.164124 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32532e-11 ( -9.32532e-11 5.16234e-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: 0.729845 ( )
Epeak [keV] : 122.498 ( -100.926 9899.06 )
Norm@50keV : 4.691102E-05 ( -2.800511E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 67.61662 using 59 PHA bins.
Reduced chi-squared = 1.207440 for 56 degrees of freedom
Null hypothesis probability = 0.137
Photon flux (15-150 keV) in 0.3840 sec: 2.075754E-02 ( -0.0207575 0.146628 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.00641e-10 ( -9.00641e-10 5.2565e-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 : 4.38543 ( -14.9987 1.344681E-03) )
beta : -9.23669 ( -0.628597 19.3714 )
Epeak [keV] : 99.9674 ( -87.1313 9912.77 )
Norm@50keV : 8.776262E-03 ( -2.256800E-02 2.063461E+07) )
------------------------------------------------------------
Chi-Squared = 67.44878 using 59 PHA bins.
Reduced chi-squared = 1.226341 for 55 degrees of freedom
Null hypothesis probability = 0.121
Photon flux (15-150 keV) in 0.3840 sec: 2.844330E-02 ( -0.0284433 0.11177 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24977e-09 ( -1.24977e-09 4.81083e-09 ) ergs/cm2
Plot creation:
Tue Jan 8 20:09:31 EST 2008