batgrbproduct Analysis for Trigger=103780
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): Fri Jan 4 20:05:43 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger103780/GCN_download_cron
======================================================================
Trigger: 00103780 Segment: 000
BAT Trigger Time: 128433653.44 [s; MET]
Trigger Stop: 128433661.632 [s; MET]
UTC: 2005-01-26T12:00:54.073440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.10963730402 Dec: 42.3890098675932 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12
Image Trigger?: NO
Rate S/N Ratio: 12.8062484748657 [ if not an image trigger ]
Image S/N Ratio: 12
Flight Position: [ source = BAT ]
RA: 278.10963730402 Dec: 42.3890098675932 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.128333238863 Dec: 42.3894816750991 [deg; J2000]
{ 18h 32m 30.8s , +42d 23' 22.1" }
+/- 1.61895479165365 [arcmin] (estimated 90% radius based on SNR)
+/- 0.712648523218672 [arcmin] (formal 1-sigma fit error)
SNR: 15.2831063409632
RA = 18h 32m 30.8s (278.128333 deg.)
Dec = 42d 23' 22" (42.389482 deg.)
Angular difference between Flight and Ground position is 0.828992 arcmin
Partial Coding Fraction: 0.421875 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -11.4399999976158
to: 36.5600000023842 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 4.56000000238419
to: 20.5600000023842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 12.0600000023842
to: 13.0600000023842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.4399999976158
to: 36.5600000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.253616 0.570621 0.406246 0.095949
0.045838 0.047826 0.042130 0.034905 [error]
Peak 0.148987 0.277947 0.263264 0.052244
0.026799 0.028188 0.024848 0.020133 [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 1.02e-07 2.05e-07 3.18e-07 1.09e-06 8.87e-07 1.69e-06 erg/cm2
Error 1.85e-08 2.29e-08 3.97e-08 2.91e-07 9.93e-08 3.20e-07 erg/cm2
Peak flux Power-law 1.08e-01 1.24e-01 1.03e-01 1.45e-01 3.87e-01 4.80e-01 ph/cm2/s
Error 2.18e-02 1.55e-02 1.24e-02 3.65e-02 4.26e-02 5.17e-02 ph/cm2/s
Fluence Cutoff-PL 8.97e-08 2.24e-07 3.38e-07 3.81e-07 8.44e-07 1.05e-06 erg/cm2
Error 2.14e-08 2.90e-08 4.63e-08 3.60e-07 1.08e-07 3.68e-07 erg/cm2
Peak flux Cutoff-PL 9.56e-02 1.29e-01 1.10e-01 8.73e-02 3.80e-01 4.23e-01 ph/cm2/s
Error 2.63e-02 1.76e-02 1.53e-02 6.04e-02 4.36e-02 8.89e-02 ph/cm2/s
Fluence Band 8.79e-08 2.31e-07 3.16e-07 8.15e-07 8.62e-07 1.46e-06 erg/cm2
Error 2.22e-08 2.75e-08 3.94e-08 3.09e-07 9.42e-08 3.40e-07 erg/cm2
Peak flux Band 9.56e-02 1.29e-01 1.10e-01 8.73e-02 3.80e-01 4.22e-01 ph/cm2/s
Error 2.63e-02 1.76e-02 1.53e-02 6.04e-02 4.36e-02 7.51e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.365 0.170 - - 1.90e-03 1.95e-04 85.061 57
CPL 0.545 0.774 90.3 98.8 4.89e-03 6.11e-03 80.735 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.267 0.181 - - 3.27e-03 3.43e-04 73.898 57
CPL 0.742 0.718 131.1 4959.5 5.77e-03 5.12e-03 72.179 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: 16.512000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -11.440 36.560
T90 48.000 -11.440 36.560
T50 16.000 4.560 20.560
Peak 1.000 12.060 13.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.1283 +42.3895 0.0126 30.2 -77.9 1.4234 15.3 TRIG_00103780
------------------------------------------
Foreground time interval of the image:
-11.440 36.560 (delta_t = 48.000 [sec])
Background time interval of the image:
-299.440 -11.440 (delta_t = 288.000 [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 -11.440 sec. to 36.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36501 ( -0.170997 0.169546 )
Norm@50keV : 1.898830E-03 ( -1.948751E-04 1.946326E-04) )
------------------------------------------------------------
Chi-Squared = 85.06108 using 59 PHA bins.
Reduced chi-squared = 1.492300 for 57 degrees of freedom
Null hypothesis probability = 9.387E-03
Photon flux (15-150 keV) in 48.00 sec: 0.229472 ( -0.024219 0.024271 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.87237e-07 ( -9.8976e-08 9.96864e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.440 sec. to 36.560 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.545362 ( -0.810771 0.737961 )
Epeak [keV] : 90.3247 ( -24.0613 173.503 )
Norm@50keV : 4.888807E-03 ( -4.888807E-03 7.332360E-03) )
------------------------------------------------------------
Chi-Squared = 80.73486 using 59 PHA bins.
but latest trial 1.22843 gives Chi-Squared = 4.77738
Reduced chi-squared = 1.441694 for 56 degrees of freedom
Null hypothesis probability = 1.691E-02
Photon flux (15-150 keV) in 48.00 sec: 0.223669 ( -0.024716 0.024759 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44378e-07 ( -1.08091e-07 1.08038e-07 ) ergs/cm2
Band function
Time interval is from -11.440 sec. to 36.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.545382 ( -0.684827 0.811647 )
beta : -9.36345 ( -0.636548 11.0466 )
Epeak [keV] : 90.2957 ( -24.0606 173.266 )
Norm@50keV : 4.889978E-03 ( -4.889978E-03 7.337192E-03) )
------------------------------------------------------------
Chi-Squared = 80.73471 using 59 PHA bins.
Reduced chi-squared = 1.467904 for 55 degrees of freedom
Null hypothesis probability = 1.349E-02
Photon flux (15-150 keV) in 48.00 sec: 0.223631 ( -0.024686 0.0248 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61787e-07 ( -9.55152e-08 9.28512e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.560 sec. to 20.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26701 ( -0.182160 0.179263 )
Norm@50keV : 3.266542E-03 ( -3.427246E-04 3.427002E-04) )
------------------------------------------------------------
Chi-Squared = 73.89841 using 59 PHA bins.
Reduced chi-squared = 1.296463 for 57 degrees of freedom
Null hypothesis probability = 6.554E-02
Photon flux (15-150 keV) in 16.00 sec: 0.387440 ( -0.042528 0.042645 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20699e-07 ( -5.89552e-08 5.93696e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.560 sec. to 20.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.742459 ( -0.804817 0.630635 )
Epeak [keV] : 131.147 ( -50.1355 9868.85 )
Norm@50keV : 5.770566E-03 ( -2.700043E-03 7.546762E-03) )
------------------------------------------------------------
Chi-Squared = 72.17919 using 59 PHA bins.
Reduced chi-squared = 1.288914 for 56 degrees of freedom
Null hypothesis probability = 7.161E-02
Photon flux (15-150 keV) in 16.00 sec: 0.380381 ( -0.043602 0.043629 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09104e-07 ( -6.26112e-08 6.1984e-08 ) ergs/cm2
Band function
Time interval is from 4.560 sec. to 20.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.740856 ( -0.632216 0.803331 )
beta : -9.18233 ( -0.817671 8.02967 )
Epeak [keV] : 130.893 ( -49.8968 9869.11 )
Norm@50keV : 5.780221E-03 ( -2.710441E-03 7.540503E-03) )
------------------------------------------------------------
Chi-Squared = 72.17919 using 59 PHA bins.
Reduced chi-squared = 1.312349 for 55 degrees of freedom
Null hypothesis probability = 5.996E-02
Photon flux (15-150 keV) in 16.00 sec: 0.380396 ( -0.04362 0.043645 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08715e-07 ( -6.25024e-08 6.20592e-08 ) ergs/cm2
Plot creation:
Fri Jan 4 20:17:30 EST 2008