batgrbproduct Analysis for Trigger=310613
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): Thu May 1 10:08:37 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger310613/SDC
======================================================================
Trigger: 00310613 Segment: 000
BAT Trigger Time: 231277984.832 [s; MET]
Trigger Stop: 231277985.344 [s; MET]
UTC: 2008-04-30T19:53:02.075640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 165.322321743452 Dec: 51.6894257321077 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.83
Image Trigger?: NO
Rate S/N Ratio: 19.3390796058137 [ if not an image trigger ]
Image S/N Ratio: 10.83
Flight Position: [ source = BAT ]
RA: 165.322321743452 Dec: 51.6894257321077 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 165.318761482321 Dec: 51.6830455016646 [deg; J2000]
{ 11h 01m 16.5s , +51d 40' 59.0" }
+/- 0.744593731727826 [arcmin] (estimated 90% radius based on SNR)
+/- 0.257376105023243 [arcmin] (formal 1-sigma fit error)
SNR: 46.3543718395504
RA = 11h 1m 16.5s (165.318761 deg.)
Dec = 51d 40' 59" (51.683046 deg.)
Angular difference between Flight and Ground position is 0.405075 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 14.3320000171661 +/- 2.18311336401004
Measured from: 0.356000006198883
to: 14.688000023365 [s; relative to TRIGTIME]
T50: 4.95600003004074 +/- 0.410112166771612
Measured from: 1.75200000405312
to: 6.70800003409386 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.69600000977516
to: 2.69600000977516 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.299999982118607
to: 17.660000026226 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.758471 0.777862 0.476103 0.096300
0.022934 0.023339 0.021784 0.021567 [error]
Peak 0.113331 0.122690 0.075020 0.016599
0.006319 0.006491 0.005959 0.005374 [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 1.99e-07 3.16e-07 3.79e-07 8.87e-07 1.15e-06 1.78e-06 erg/cm2
Error 1.56e-08 1.33e-08 2.27e-08 1.22e-07 5.05e-08 1.36e-07 erg/cm2
Peak flux Power-law 1.05e+00 8.89e-01 5.11e-01 4.37e-01 2.65e+00 2.89e+00 ph/cm2/s
Error 1.14e-01 5.72e-02 5.04e-02 8.82e-02 1.71e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 1.99e-07 3.17e-07 3.79e-07 8.79e-07 1.15e-06 1.77e-06 erg/cm2
Error 1.56e-08 1.33e-08 2.28e-08 1.21e-07 5.05e-08 1.35e-07 erg/cm2
Peak flux Cutoff-PL 1.05e+00 8.89e-01 5.11e-01 4.34e-01 2.64e+00 2.89e+00 ph/cm2/s
Error 1.14e-01 5.72e-02 5.05e-02 8.76e-02 1.71e-01 1.83e-01 ph/cm2/s
Fluence Band 1.99e-07 3.15e-07 3.79e-07 8.86e-07 1.15e-06 1.77e-06 erg/cm2
Error 8.66e-09 1.25e-08 1.61e-08 8.56e-08 6.36e-08 8.29e-08 erg/cm2
Peak flux Band 1.04e+00 8.98e-01 5.07e-01 4.24e-01 2.63e+00 2.87e+00 ph/cm2/s
Error 1.08e-01 6.77e-02 3.99e-02 1.38e-01 1.79e-01 1.99e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.739 0.087 - - 6.94e-03 2.90e-04 56.885 57
CPL 1.738 0.087 9996.9 5000.0 6.95e-03 2.92e-04 56.903 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.799 0.128 - - 1.92e-02 1.39e-03 47.601 57
CPL 1.755 0.432 268.0 5000.0 2.02e-02 9.48e-03 47.595 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: 12.288000 sec.
T50 in the 50-300 keV band: 4.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.960 -0.300 17.660
T90 14.332 0.356 14.688
T50 4.956 1.752 6.708
Peak 1.000 1.696 2.696
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
165.3188 +51.6830 0.0041 7.7 34.7 2.0323 46.4 TRIG_00310613
------------------------------------------
Foreground time interval of the image:
-0.300 13.773 (delta_t = 14.073 [sec])
Background time interval of the image:
-190.627 -0.300 (delta_t = 190.327 [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 -0.300 sec. to 17.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73911 ( -8.659112E-02 8.741701E-02) )
Norm@50keV : 6.939487E-03 ( -2.908865E-04 2.889978E-04) )
------------------------------------------------------------
Chi-Squared = 56.88464 using 59 PHA bins.
Reduced chi-squared = 0.9979762 for 57 degrees of freedom
Null hypothesis probability = 0.479
Photon flux (15-150 keV) in 17.96 sec: 0.934597 ( -0.03997 0.040176 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15085e-06 ( -5.04083e-08 5.06544e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 17.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73792 ( -8.706999E-02 8.786476E-02) )
Epeak [keV] : 9996.85 ( -9996.84 3.14648 )
Norm@50keV : 6.950180E-03 ( -2.925983E-04 2.906173E-04) )
------------------------------------------------------------
Chi-Squared = 56.90319 using 59 PHA bins.
Reduced chi-squared = 1.016128 for 56 degrees of freedom
Null hypothesis probability = 0.441
Photon flux (15-150 keV) in 17.96 sec: 0.934056 ( -0.039946 0.040155 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15057e-06 ( -5.01479e-08 5.09166e-08 ) ergs/cm2
Band function
Time interval is from -0.300 sec. to 17.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41667 ( -8.58333 6.41667 )
beta : -1.73910 ( -8.743143E-02 8.658075E-02) )
Epeak [keV] : 17.4490 ( -17.3490 9982.55 )
Norm@50keV : 1.628584E-02 ( -1.628584E-02 67.3175 )
------------------------------------------------------------
Chi-Squared = 56.88465 using 59 PHA bins.
Reduced chi-squared = 1.034266 for 55 degrees of freedom
Null hypothesis probability = 0.405
Photon flux (15-150 keV) in 17.96 sec: 0.933494 ( -0.037782 0.036617 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15003e-06 ( -8.20413e-08 4.51245e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.696 sec. to 2.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79889 ( -0.126948 0.129495 )
Norm@50keV : 1.920306E-02 ( -1.401193E-03 1.381975E-03) )
------------------------------------------------------------
Chi-Squared = 47.60097 using 59 PHA bins.
Reduced chi-squared = 0.8351048 for 57 degrees of freedom
Null hypothesis probability = 0.808
Photon flux (15-150 keV) in 1.000 sec: 2.64500 ( -0.17055 0.1709 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76732e-07 ( -1.3075e-08 1.3367e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.696 sec. to 2.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75487 ( -0.489526 0.375222 )
Epeak [keV] : 267.990 ( -267.980 9732.01 )
Norm@50keV : 2.022617E-02 ( -2.408190E-03 1.655435E-02) )
------------------------------------------------------------
Chi-Squared = 47.59491 using 59 PHA bins.
Reduced chi-squared = 0.8499090 for 56 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 1.000 sec: 2.64389 ( -0.17047 0.17083 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76988e-07 ( -1.3347e-08 1.3114e-08 ) ergs/cm2
Band function
Time interval is from 1.696 sec. to 2.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27653 ( -8.72346 3.41351 )
beta : -1.82404 ( -8.17596 0.145905 )
Epeak [keV] : 37.1434 ( -37.0434 9962.86 )
Norm@50keV : 4.560428E-02 ( -1.20502 4250.65 )
------------------------------------------------------------
Chi-Squared = 47.35234 using 59 PHA bins.
Reduced chi-squared = 0.8609517 for 55 degrees of freedom
Null hypothesis probability = 0.759
Photon flux (15-150 keV) in 1.000 sec: 2.63419 ( -0.18436 0.17321 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75151e-07 ( -1.3458e-08 1.3748e-08 ) ergs/cm2
Plot creation:
Thu May 1 10:44:46 EDT 2008