batgrbproduct Analysis for Trigger=153866
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 19:47:50 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger153866/SDC
======================================================================
Trigger: 00153866 Segment: 000
BAT Trigger Time: 147695524.508 [s; MET]
Trigger Stop: 147695524.572 [s; MET]
UTC: 2005-09-06T10:32:04.793880 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 52.8028382671989 Dec: -14.6254406768592 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.47
Image Trigger?: NO
Rate S/N Ratio: 6 [ if not an image trigger ]
Image S/N Ratio: 6.47
Flight Position: [ source = BAT ]
RA: 52.8028382671989 Dec: -14.6254406768592 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 52.8054504866816 Dec: -14.624059242077 [deg; J2000]
{ 03h 31m 13.3s , -14d 37' 26.6" }
+/- 3.24583451419037 [arcmin] (estimated 90% radius based on SNR)
+/- 1.6477648481867 [arcmin] (formal 1-sigma fit error)
SNR: 5.65785914730326
RA = 3h 31m 13.3s (52.805450 deg.)
Dec = -14d 37' 27" (-14.624059 deg.)
Angular difference between Flight and Ground position is 0.172828 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000861 0.007188 0.004836 0.001712
0.001437 0.001457 0.001507 0.001132 [error]
Peak 0.000861 0.007188 0.004836 0.001712
0.001437 0.001457 0.001507 0.001132 [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 1.03e-09 1.85e-09 2.53e-09 7.15e-09 7.30e-09 1.20e-08 erg/cm2
Error 5.41e-10 6.65e-10 1.01e-09 6.97e-09 2.60e-09 6.52e-09 erg/cm2
Peak flux Power-law 5.22e-01 5.11e-01 3.49e-01 3.74e-01 1.53e+00 1.76e+00 ph/cm2/s
Error 2.77e-01 1.87e-01 1.36e-01 2.69e-01 5.42e-01 5.98e-01 ph/cm2/s
Fluence Cutoff-PL 6.17e-10 2.40e-09 3.24e-09 9.39e-10 7.06e-09 7.25e-09 erg/cm2
Error 6.36e-10 9.24e-10 1.59e-09 2.38e-09 2.62e-09 3.30e-09 erg/cm2
Peak flux Cutoff-PL 3.02e-01 6.43e-01 4.64e-01 7.33e-02 1.47e+00 1.48e+00 ph/cm2/s
Error 3.17e-01 2.55e-01 2.15e-01 1.47e-01 5.23e-01 5.34e-01 ph/cm2/s
Fluence Band 6.97e-10 2.40e-09 3.14e-09 1.02e-09 7.10e-09 7.76e-09 erg/cm2
Error 3.21e-10 7.53e-10 8.95e-10 8.77e-10 2.46e-09 3.39e-09 erg/cm2
Peak flux Band 2.75e-01 6.30e-01 4.77e-01 7.53e-02 1.46e+00 1.40e+00 ph/cm2/s
Error 1.60e-01 1.49e-01 1.67e-01 5.05e-01 4.52e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.548 0.494 - - 1.21e-02 4.15e-03 58.488 57
CPL -1.220 2.053 60.7 34.2 2.70e-01 7.91e-01 54.172 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.548 0.494 - - 1.21e-02 4.15e-03 58.488 57
CPL -1.220 2.053 60.7 34.2 2.70e-01 7.91e-01 54.172 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
52.8055 -14.6241 0.0340 31.5 168.4 0.0166 5.7 TRIG_00153866
------------------------------------------
Foreground time interval of the image:
0.028 0.092 (delta_t = 0.064 [sec])
Background time interval of the image:
-679.480 -659.446 (delta_t = 20.034 [sec])
-299.480 -4.480 (delta_t = 295.000 [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 0.028 sec. to 0.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54767 ( -0.484461 0.503902 )
Norm@50keV : 1.210641E-02 ( -4.158598E-03 4.140639E-03) )
------------------------------------------------------------
Chi-Squared = 58.48842 using 59 PHA bins.
Reduced chi-squared = 1.026113 for 57 degrees of freedom
Null hypothesis probability = 0.421
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.53216 ( -0.53863 0.54474 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.29517e-09 ( -2.58164e-09 2.61446e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 0.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21982 ( -1.78018 2.32546 )
Epeak [keV] : 60.7458 ( -17.6482 50.7286 )
Norm@50keV : 0.270303 ( -0.270303 1.31190 )
------------------------------------------------------------
Chi-Squared = 54.17239 using 59 PHA bins.
Reduced chi-squared = 0.9673640 for 56 degrees of freedom
Null hypothesis probability = 0.544
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.47481 ( -0.509903 0.5361 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06106e-09 ( -2.58479e-09 2.64755e-09 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 0.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.20268 ( -2.33600 3.67011 )
beta : -9.26304 ( -0.736958 19.2629 )
Epeak [keV] : 60.9634 ( -20.2023 50.5370 )
Norm@50keV : 0.263593 ( -37.7829 16.6048 )
------------------------------------------------------------
Chi-Squared = 54.17281 using 59 PHA bins.
Reduced chi-squared = 0.9849602 for 55 degrees of freedom
Null hypothesis probability = 0.506
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.45724 ( -0.463079 0.54698 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.09517e-09 ( -2.43012e-09 2.48237e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.028 sec. to 0.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54767 ( -0.484461 0.503902 )
Norm@50keV : 1.210641E-02 ( -4.158598E-03 4.140639E-03) )
------------------------------------------------------------
Chi-Squared = 58.48842 using 59 PHA bins.
Reduced chi-squared = 1.026113 for 57 degrees of freedom
Null hypothesis probability = 0.421
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.53216 ( -0.53863 0.54474 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.29517e-09 ( -2.58164e-09 2.61446e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 0.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21982 ( -1.78018 2.32546 )
Epeak [keV] : 60.7458 ( -17.6482 50.7286 )
Norm@50keV : 0.270303 ( -0.270303 1.31190 )
------------------------------------------------------------
Chi-Squared = 54.17239 using 59 PHA bins.
Reduced chi-squared = 0.9673640 for 56 degrees of freedom
Null hypothesis probability = 0.544
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.47481 ( -0.509903 0.5361 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06106e-09 ( -2.58479e-09 2.64755e-09 ) ergs/cm2
Band function
Time interval is from 0.028 sec. to 0.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.20268 ( -2.33600 3.67011 )
beta : -9.26304 ( -0.736958 19.2629 )
Epeak [keV] : 60.9634 ( -20.2023 50.5370 )
Norm@50keV : 0.263593 ( -37.7829 16.6048 )
------------------------------------------------------------
Chi-Squared = 54.17281 using 59 PHA bins.
Reduced chi-squared = 0.9849602 for 55 degrees of freedom
Null hypothesis probability = 0.506
Photon flux (15-150 keV) in 6.4000E-02 sec: 1.45724 ( -0.463079 0.54698 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.09517e-09 ( -2.43012e-09 2.48237e-09 ) ergs/cm2
Plot creation:
Tue Jan 8 19:58:20 EST 2008