batgrbproduct Analysis for Trigger=307170
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): Sat Mar 22 02:45:37 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger307170/GCN5_download_cron
======================================================================
Trigger: 00307170 Segment: 000
BAT Trigger Time: 227800561.088 [s; MET]
Trigger Stop: 227800562.112 [s; MET]
UTC: 2008-03-21T13:55:58.428700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 100.546272000787 Dec: 79.7474285285693 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.79
Image Trigger?: NO
Rate S/N Ratio: 7.21110255092798 [ if not an image trigger ]
Image S/N Ratio: 5.79
Flight Position: [ source = BAT ]
RA: 100.546272000787 Dec: 79.7474285285693 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 100.680230899275 Dec: 79.7576950803466 [deg; J2000]
{ 06h 42m 43.3s , +79d 45' 27.7" }
+/- 4.141829828391 [arcmin] (estimated 90% radius based on SNR)
+/- 2.24349822303677 [arcmin] (formal 1-sigma fit error)
SNR: 3.99406532418912
RA = 6h 42m 43.3s (100.680231 deg.)
Dec = 79d 45' 28" (79.757695 deg.)
Angular difference between Flight and Ground position is 1.556915 arcmin
Partial Coding Fraction: 0.1103516 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.082621 0.018431 0.048938 0.013762
0.019176 0.019046 0.018210 0.019897 [error]
Peak 0.082621 0.018431 0.048938 0.013762
0.019176 0.019046 0.018210 0.019897 [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 4.22e-08 2.01e-08 5.84e-09 2.04e-09 6.90e-08 7.11e-08 erg/cm2
Error 1.50e-08 1.77e-08 1.08e-08 1.19e-08 3.25e-08 3.77e-08 erg/cm2
Peak flux Power-law 1.40e+00 3.75e-01 5.38e-02 8.72e-03 1.83e+00 1.83e+00 ph/cm2/s
Error 5.09e-01 3.22e-01 1.00e-01 4.41e-02 6.25e-01 6.28e-01 ph/cm2/s
Fluence Cutoff-PL 4.23e-08 1.98e-08 5.71e-09 2.03e-09 6.91e-08 6.96e-08 erg/cm2
Error 1.49e-08 1.45e-08 1.06e-08 1.17e-08 3.25e-08 3.75e-08 erg/cm2
Peak flux Cutoff-PL 1.40e+00 3.75e-01 5.36e-02 8.63e-03 1.83e+00 1.83e+00 ph/cm2/s
Error 5.09e-01 3.22e-01 1.00e-01 4.37e-02 6.24e-01 6.28e-01 ph/cm2/s
Fluence Band 2.49e-08 3.03e-08 2.65e-08 1.43e-08 7.20e-08 1.22e-07 erg/cm2
Error 9.10e-09 1.21e-08 4.53e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.40e+00 3.75e-01 5.36e-02 8.64e-03 1.83e+00 1.83e+00 ph/cm2/s
Error 5.09e-01 3.22e-01 1.00e-01 4.37e-02 6.24e-01 6.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.798 1.532 - - 3.53e-03 4.80e-03 57.648 57
CPL 1.799 1.647 1.8 20.3 2.09e-01 0.00e+00 58.240 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.798 1.532 - - 3.53e-03 4.80e-03 57.648 57
CPL 1.799 0.000 1.8 23.8 2.09e-01 0.00e+00 58.240 0
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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.6802 +79.7577 0.0482 55.8 -13.5 0.1580 4.0 TRIG_00307170
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.088 -9.088 (delta_t = 51.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.79834 ( -1.27046 1.79433 )
Norm@50keV : 3.532688E-03 ( -3.532688E-03 6.070632E-03) )
------------------------------------------------------------
Chi-Squared = 57.64839 using 59 PHA bins.
Reduced chi-squared = 1.011375 for 57 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 1.024 sec: 1.83125 ( -0.62547 0.62374 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.8998e-08 ( -2.86166e-08 3.64402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.79941 ( -0.846831 2.44804 )
Epeak [keV] : 1.83822 ( -1.82822 38.7830 )
Norm@50keV : 0.208813 ( )
------------------------------------------------------------
Chi-Squared = 58.23965 using 59 PHA bins.
but latest trial 0.952575 gives Chi-Squared = 0.00000
but latest trial 60.0136 gives Chi-Squared = 5.08753
Reduced chi-squared = 1.039994 for 56 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 1.024 sec: 1.82998 ( -0.62525 0.62351 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.90669e-08 ( -2.87092e-08 3.63222e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.27366 ( -2.72634 3.47960 )
beta : -3.80490 ( -1.79176 1.27701 )
Epeak [keV] : 124.391 ( -124.291 9875.61 )
Norm@50keV : 0.477482 ( -0.477482 0.828186 )
------------------------------------------------------------
Chi-Squared = 57.64835 using 59 PHA bins.
Reduced chi-squared = 1.048152 for 55 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 1.024 sec: 1.83002 ( -0.62528 0.62349 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19922e-08 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.79834 ( -1.27046 1.79433 )
Norm@50keV : 3.532688E-03 ( -3.532688E-03 6.070632E-03) )
------------------------------------------------------------
Chi-Squared = 57.64839 using 59 PHA bins.
Reduced chi-squared = 1.011375 for 57 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 1.024 sec: 1.83125 ( -0.62547 0.62374 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.8998e-08 ( -2.86166e-08 3.64402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79941 ( )
Epeak [keV] : 1.83822 ( -8.85098 38.7830 )
Norm@50keV : 0.208813 ( )
------------------------------------------------------------
Chi-Squared = 58.23965 using 59 PHA bins.
but latest trial 67.4472 gives Chi-Squared = 4.98356
Reduced chi-squared = 1.039994 for 56 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 1.024 sec: 1.82998 ( -0.62525 0.62351 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.90669e-08 ( -2.87092e-08 3.63222e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.27366 ( -2.72634 5.34511 )
beta : -3.80490 ( -1.79176 1.27701 )
Epeak [keV] : 124.391 ( -124.291 9875.61 )
Norm@50keV : 0.477482 ( -0.477482 0.828186 )
------------------------------------------------------------
Chi-Squared = 57.64835 using 59 PHA bins.
Reduced chi-squared = 1.048152 for 55 degrees of freedom
Null hypothesis probability = 0.378
Photon flux (15-150 keV) in 1.024 sec: 1.83002 ( -0.62528 0.62349 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19922e-08 ( 0 0 ) ergs/cm2
Plot creation:
Sat Mar 22 03:02:46 EDT 2008