batgrbproduct Analysis for Trigger=143708
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): Mon Jan 7 11:42:39 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger143708/SDC
======================================================================
Trigger: 00143708 Segment: 000
BAT Trigger Time: 141910979.072 [s; MET]
Trigger Stop: 141910980.096 [s; MET]
UTC: 2005-07-01T11:42:59.472220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.286665301381 Dec: -59.4186472467233 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.22
Image Trigger?: NO
Rate S/N Ratio: 26.3628526529281 [ if not an image trigger ]
Image S/N Ratio: 14.22
Flight Position: [ source = BAT ]
RA: 227.286665301381 Dec: -59.4186472467233 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.242614420106 Dec: -59.4030753957375 [deg; J2000]
{ 15h 08m 58.2s , -59d 24' 11.1" }
+/- 2.10773979595633 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02620495451447 [arcmin] (formal 1-sigma fit error)
SNR: 10.4838952294523
RA = 15h 8m 58.2s (227.242614 deg.)
Dec = -59d 24' 11" (-59.403075 deg.)
Angular difference between Flight and Ground position is 1.637663 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 21.7800000011921 +/- 9.901072273182
Measured from: -3.69200000166893
to: 18.0879999995232 [s; relative to TRIGTIME]
T50: 7.71999999880791 +/- 0.663204356278342
Measured from: 0.0160000026226044
to: 7.73600000143051 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.36399999260902
to: 8.36399999260902 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.73199999332428
to: 28.4079999923706 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.718773 0.913715 0.549427 0.154202
0.031858 0.032479 0.028409 0.024150 [error]
Peak 0.091950 0.123961 0.098730 0.036628
0.006627 0.007189 0.006465 0.005246 [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 2.26e-07 3.69e-07 4.55e-07 1.11e-06 1.36e-06 2.19e-06 erg/cm2
Error 1.88e-08 1.76e-08 2.91e-08 1.58e-07 6.76e-08 1.80e-07 erg/cm2
Peak flux Power-law 7.99e-01 8.90e-01 7.08e-01 9.33e-01 2.74e+00 3.33e+00 ph/cm2/s
Error 1.02e-01 6.59e-02 5.49e-02 1.61e-01 1.80e-01 2.17e-01 ph/cm2/s
Fluence Cutoff-PL 2.23e-07 3.71e-07 4.57e-07 1.03e-06 1.36e-06 2.01e-06 erg/cm2
Error 2.17e-08 1.98e-08 2.89e-08 3.24e-07 6.80e-08 3.02e-07 erg/cm2
Peak flux Cutoff-PL 7.98e-01 8.90e-01 7.08e-01 9.27e-01 2.74e+00 3.32e+00 ph/cm2/s
Error 1.02e-01 6.59e-02 5.50e-02 1.60e-01 1.80e-01 2.17e-01 ph/cm2/s
Fluence Band 2.21e-07 3.73e-07 4.51e-07 1.07e-06 1.35e-06 2.15e-06 erg/cm2
Error 1.74e-08 2.15e-08 3.11e-08 2.77e-07 7.16e-08 3.65e-07 erg/cm2
Peak flux Band 7.91e-01 8.87e-01 7.10e-01 9.45e-01 2.74e+00 3.33e+00 ph/cm2/s
Error 8.15e-02 4.44e-02 7.89e+03 1.06e-01 1.75e-01 2.11e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.696 0.089 - - 4.45e-03 2.09e-04 64.436 57
CPL 1.651 0.239 386.3 5000.0 4.68e-03 1.34e-03 64.384 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.330 0.122 - - 2.28e-02 1.44e-03 63.363 57
CPL 1.326 0.123 9999.1 5000.0 2.29e-02 1.45e-03 63.418 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: 8.064000 sec.
T50 in the 50-300 keV band: 4.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.140 -4.732 28.408
T90 21.780 -3.692 18.088
T50 7.720 0.016 7.736
Peak 1.000 7.364 8.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.2426 -59.4031 0.0184 19.5 82.1 1.5829 10.5 TRIG_00143708
------------------------------------------
Foreground time interval of the image:
-4.732 28.408 (delta_t = 33.140 [sec])
Background time interval of the image:
-10.072 -4.732 (delta_t = 5.340 [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 -4.732 sec. to 28.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69611 ( -8.875608E-02 8.938134E-02) )
Norm@50keV : 4.445248E-03 ( -2.094773E-04 2.083047E-04) )
------------------------------------------------------------
Chi-Squared = 64.43581 using 59 PHA bins.
Reduced chi-squared = 1.130453 for 57 degrees of freedom
Null hypothesis probability = 0.233
Photon flux (15-150 keV) in 33.14 sec: 0.589578 ( -0.028363 0.028494 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36438e-06 ( -6.74001e-08 6.77481e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.732 sec. to 28.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65092 ( -0.345552 0.132707 )
Epeak [keV] : 386.331 ( -386.321 9613.67 )
Norm@50keV : 4.683395E-03 ( -4.384085E-04 2.234536E-03) )
------------------------------------------------------------
Chi-Squared = 64.38377 using 59 PHA bins.
Reduced chi-squared = 1.149710 for 56 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 33.14 sec: 0.587588 ( -0.030629 0.029943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3593e-06 ( -6.91102e-08 6.69594e-08 ) ergs/cm2
Band function
Time interval is from -4.732 sec. to 28.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05066 ( -8.94934 3.55353 )
beta : -1.72581 ( -8.27419 0.105003 )
Epeak [keV] : 42.7218 ( -42.6218 9957.28 )
Norm@50keV : 1.230197E-02 ( -1.230197E-02 77.7515 )
------------------------------------------------------------
Chi-Squared = 63.68615 using 59 PHA bins.
Reduced chi-squared = 1.157930 for 55 degrees of freedom
Null hypothesis probability = 0.197
Photon flux (15-150 keV) in 33.14 sec: 0.582217 ( -0.032749 0.031549 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34866e-06 ( -7.07274e-08 7.25501e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 7.364 sec. to 8.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32959 ( -0.122816 0.121943 )
Norm@50keV : 2.284765E-02 ( -1.441032E-03 1.439547E-03) )
------------------------------------------------------------
Chi-Squared = 63.36304 using 59 PHA bins.
Reduced chi-squared = 1.111632 for 57 degrees of freedom
Null hypothesis probability = 0.262
Photon flux (15-150 keV) in 1.000 sec: 2.74118 ( -0.17983 0.18042 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24243e-07 ( -1.5938e-08 1.5927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.364 sec. to 8.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32626 ( -0.123609 0.122718 )
Epeak [keV] : 9999.07 ( -9999.06 0.928711 )
Norm@50keV : 2.293845E-02 ( -1.447555E-03 1.447180E-03) )
------------------------------------------------------------
Chi-Squared = 63.41822 using 59 PHA bins.
Reduced chi-squared = 1.132468 for 56 degrees of freedom
Null hypothesis probability = 0.231
Photon flux (15-150 keV) in 1.000 sec: 2.74011 ( -0.17977 0.18035 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2422e-07 ( -1.5897e-08 1.5982e-08 ) ergs/cm2
Band function
Time interval is from 7.364 sec. to 8.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.995934 ( -9.00407 3.89212 )
beta : -1.33049 ( -0.137987 0.123730 )
Epeak [keV] : 57.0427 ( -56.9427 468.657 )
Norm@50keV : 4.413388E-02 ( -2.271470E-02 2.46740 )
------------------------------------------------------------
Chi-Squared = 63.36129 using 59 PHA bins.
Reduced chi-squared = 1.152023 for 55 degrees of freedom
Null hypothesis probability = 0.205
Photon flux (15-150 keV) in 1.000 sec: 2.73852 ( -0.1775 0.17217 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24007e-07 ( -1.5872e-08 1.6019e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 11:52:37 EST 2008