batgrbproduct Analysis for Trigger=203127
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 Dec 31 16:48:04 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger203127/GCN5_download_cron
======================================================================
Trigger: 00203127 Segment: 000
BAT Trigger Time: 165293590.464 [s; MET]
Trigger Stop: 165293590.592 [s; MET]
UTC: 2006-03-29T02:53:09.364520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.804401434249 Dec: 9.33003454954243 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.28
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 26.28
Flight Position: [ source = BAT ]
RA: 286.804401434249 Dec: 9.33003454954243 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.801223104471 Dec: 9.3155280992309 [deg; J2000]
{ 19h 07m 12.3s , +09d 18' 55.9" }
+/- 0.826103955836141 [arcmin] (estimated 90% radius based on SNR)
+/- 0.249108398692472 [arcmin] (formal 1-sigma fit error)
SNR: 39.9613576493736
RA = 19h 7m 12.3s (286.801223 deg.)
Dec = 9d 18' 56" (9.315528 deg.)
Angular difference between Flight and Ground position is 0.890497 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 20.4079999923706 +/- 0.01442223432929
Measured from: 4.06800001859665
to: 24.4760000109673 [s; relative to TRIGTIME]
T50: 14.5400000214577 +/- 0.065115262392695
Measured from: 6.22400000691414
to: 20.7640000283718 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.0280000269413
to: 5.0280000269413 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.0039999783039
to: 32.5439999997616 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 33.318708 28.245598 5.565196 0.090825
0.078794 0.072469 0.035378 0.013841 [error]
Peak 4.529678 4.428164 0.983878 0.017950
0.028378 0.027851 0.013545 0.002433 [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 1.85e-05 1.05e-05 3.61e-06 1.62e-06 3.40e-05 3.00e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 8.35e+01 2.94e+01 5.90e+00 1.40e+00 1.20e+02 1.20e+02 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 9.94e-06 1.18e-05 4.43e-06 3.51e-07 2.65e-05 2.31e-05 erg/cm2
Error 5.51e-07 2.22e-07 7.76e-08 2.84e-08 6.98e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.29e+01 3.41e+01 7.70e+00 3.36e-01 8.51e+01 8.51e+01 ph/cm2/s
Error 2.70e+00 7.30e-01 1.83e-01 3.66e-02 3.11e+00 3.12e+00 ph/cm2/s
Fluence Band 1.19e-05 1.20e-05 3.64e-06 1.38e-06 2.85e-05 2.71e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.33e+01 3.41e+01 7.69e+00 3.45e-01 8.55e+01 8.54e+01 ph/cm2/s
Error 2.66e+00 6.77e-01 1.80e-01 4.45e-02 2.91e+00 2.92e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.539 0.000 - - 4.26e-02 0.00e+00 1356.017 57
CPL 0.713 0.169 23.2 1.7 9.82e-01 1.77e-01 26.979 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.319 0.000 - - 3.42e-01 0.00e+00 1170.840 57
CPL 0.314 0.205 28.2 1.6 1.04e+01 2.39e+00 30.073 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: 17.536000 sec.
T50 in the 50-300 keV band: 8.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.548 -17.004 32.544
T90 20.408 4.068 24.476
T50 14.540 6.224 20.764
Peak 1.000 4.028 5.028
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.8012 +9.3155 0.0048 0.0 85.6 66.9166 40.0 TRIG_00203127
------------------------------------------
Foreground time interval of the image:
-17.004 32.544 (delta_t = 49.548 [sec])
Background time interval of the image:
-19.464 -17.004 (delta_t = 2.460 [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 -17.004 sec. to 32.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.53903 ( )
Norm@50keV : 4.259941E-02 ( )
------------------------------------------------------------
Chi-Squared = 1356.017 using 59 PHA bins.
Reduced chi-squared = 23.78977 for 57 degrees of freedom
Null hypothesis probability = 0.00
Photon flux (15-150 keV) in 49.55 sec: 17.7849 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40235e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.004 sec. to 32.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.713312 ( -0.171000 0.166345 )
Epeak [keV] : 23.2194 ( -1.79161 1.65032 )
Norm@50keV : 0.981837 ( -0.158736 0.194717 )
------------------------------------------------------------
Chi-Squared = 26.97853 using 59 PHA bins.
Reduced chi-squared = 0.4817594 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 49.55 sec: 11.8311 ( -0.4271 0.4353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65288e-05 ( -6.92957e-07 7.03015e-07 ) ergs/cm2
Band function
Time interval is from -17.004 sec. to 32.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.914216 ( -5.279118E-02 4.251266E-02) )
beta : -9.37167 ( -2.346039E-04 19.9990 )
Epeak [keV] : 21.2449 ( -1.28078 2.38073 )
Norm@50keV : 0.778022 ( -0.107190 0.259835 )
------------------------------------------------------------
Chi-Squared = 32.39202 using 59 PHA bins.
Reduced chi-squared = 0.5889459 for 55 degrees of freedom
Null hypothesis probability = 0.994
Photon flux (15-150 keV) in 49.55 sec: 11.8427 ( -0.4014 0.4205 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84781e-05 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.028 sec. to 5.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.31919 ( )
Norm@50keV : 0.342042 ( )
------------------------------------------------------------
Chi-Squared = 1170.840 using 59 PHA bins.
Reduced chi-squared = 20.54105 for 57 degrees of freedom
Null hypothesis probability = 0.00
Photon flux (15-150 keV) in 1.000 sec: 119.744 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8398e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.028 sec. to 5.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.314358 ( -0.208902 0.201107 )
Epeak [keV] : 28.1864 ( -1.62371 1.48443 )
Norm@50keV : 10.3620 ( -2.06868 2.70187 )
------------------------------------------------------------
Chi-Squared = 30.07256 using 59 PHA bins.
Reduced chi-squared = 0.5370101 for 56 degrees of freedom
Null hypothesis probability = 0.998
Photon flux (15-150 keV) in 1.000 sec: 85.0840 ( -3.0894 3.1391 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.03916e-06 ( -1.04255e-07 1.05396e-07 ) ergs/cm2
Band function
Time interval is from 4.028 sec. to 5.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49363 ( )
beta : -9.37167 ( )
Epeak [keV] : 14.6266 ( )
Norm@50keV : 2.55052 ( )
------------------------------------------------------------
Chi-Squared = 171.2990 using 59 PHA bins.
Reduced chi-squared = 3.114527 for 55 degrees of freedom
Null hypothesis probability = 7.219E-14
Photon flux (15-150 keV) in 1.000 sec: 85.4785 ( -3.0192 2.8018 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97401e-06 ( 0 0 ) ergs/cm2
Plot creation:
Mon Dec 31 16:54:55 EST 2007