batgrbproduct Analysis for Trigger=309010
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 Apr 12 13:54:27 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger309010/GCN5_download_cron
======================================================================
Trigger: 00309010 Segment: 000
BAT Trigger Time: 229641335.296 [s; MET]
Trigger Stop: 229641335.36 [s; MET]
UTC: 2008-04-11T21:15:32.585440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 38.0182886268497 Dec: -71.3420191948273 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.14
Image Trigger?: NO
Rate S/N Ratio: 14.3178210632764 [ if not an image trigger ]
Image S/N Ratio: 8.14
Flight Position: [ source = BAT ]
RA: 38.0182886268497 Dec: -71.3420191948273 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 37.9610194137874 Dec: -71.2971122656261 [deg; J2000]
{ 02h 31m 50.6s , -71d 17' 49.6" }
+/- 0.51922147067403 [arcmin] (estimated 90% radius based on SNR)
+/- 0.13506706519762 [arcmin] (formal 1-sigma fit error)
SNR: 77.5813730332534
RA = 2h 31m 50.6s (37.961019 deg.)
Dec = -71d 17' 50" (-71.297112 deg.)
Angular difference between Flight and Ground position is 2.910518 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 56.3480000197887 +/- 1.0009675337169
Measured from: 4.67199999094009
to: 61.0200000107288 [s; relative to TRIGTIME]
T50: 25.0280000269413 +/- 0.0769415325902237
Measured from: 17.891999989748
to: 42.9200000166893 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.4519999921322
to: 41.4519999921322 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.272000014781952
to: 84.0359999835491 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 15.411710 16.798518 10.842139 2.326279
0.070632 0.073077 0.064050 0.049455 [error]
Peak 1.401135 1.902483 1.341292 0.252548
0.015565 0.017927 0.015926 0.009070 [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 4.65e-06 7.31e-06 8.67e-06 2.00e-05 2.64e-05 4.08e-05 erg/cm2
Error 1.54e-07 1.40e-07 1.15e-07 6.61e-07 3.48e-07 0.00e+00 erg/cm2
Peak flux Power-law 1.57e+01 1.45e+01 9.22e+00 9.01e+00 4.32e+01 4.85e+01 ph/cm2/s
Error 5.97e-01 3.27e-01 1.65e-01 3.56e-01 9.36e-01 8.84e-01 ph/cm2/s
Fluence Cutoff-PL 4.50e-06 7.31e-06 8.74e-06 1.87e-05 2.63e-05 3.38e-05 erg/cm2
Error 2.35e-07 1.41e-07 9.28e-08 1.15e-06 3.94e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.32e+01 1.44e+01 9.77e+00 6.27e+00 4.09e+01 4.37e+01 ph/cm2/s
Error 8.35e-01 3.41e-01 2.21e-01 6.03e-01 1.08e+00 1.36e+00 ph/cm2/s
Fluence Band 4.50e-06 7.28e-06 8.71e-06 1.87e-05 2.63e-05 3.74e-05 erg/cm2
Error 2.26e-07 1.41e-07 1.48e-07 1.27e-06 4.02e-07 0.00e+00 erg/cm2
Peak flux Band 1.32e+01 1.44e+01 9.77e+00 6.27e+00 4.09e+01 4.37e+01 ph/cm2/s
Error 8.35e-01 3.41e-01 2.21e-01 6.03e-01 1.08e+00 1.37e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.755 0.027 - - 3.40e-02 4.65e-04 20.297 57
CPL 1.713 0.096 436.9 5000.0 3.53e-02 2.89e-03 19.694 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.652 0.032 - - 3.31e-01 5.58e-03 81.673 57
CPL 1.130 0.146 101.9 13.0 5.40e-01 7.27e-02 40.557 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: 46.080000 sec.
T50 in the 50-300 keV band: 24.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 84.308 -0.272 84.036
T90 56.348 4.672 61.020
T50 25.028 17.892 42.920
Peak 1.000 40.452 41.452
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
37.9610 -71.2971 0.0025 29.2 -162.9 3.8694 77.6 TRIG_00309010
------------------------------------------
Foreground time interval of the image:
-0.016 8.461 (delta_t = 8.477 [sec])
Background time interval of the image:
-239.040 -177.027 (delta_t = 62.013 [sec])
-119.040 -55.074 (delta_t = 63.966 [sec])
-54.040 -0.016 (delta_t = 54.024 [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 -0.016 sec. to 84.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75456 ( -2.667952E-02 2.666116E-02) )
Norm@50keV : 3.398516E-02 ( -4.656054E-04 4.645213E-04) )
------------------------------------------------------------
Chi-Squared = 20.29680 using 59 PHA bins.
Reduced chi-squared = 0.3560842 for 57 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 84.31 sec: 4.60319 ( -0.09069 0.09146 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6432e-05 ( -3.47357e-07 3.48538e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 84.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71253 ( -0.127146 6.430495E-02) )
Epeak [keV] : 436.947 ( -436.937 9563.05 )
Norm@50keV : 3.527660E-02 ( -1.653794E-03 4.116878E-03) )
------------------------------------------------------------
Chi-Squared = 19.69356 using 59 PHA bins.
Reduced chi-squared = 0.3516707 for 56 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 84.31 sec: 4.55813 ( -0.10964 0.12306 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63265e-05 ( -3.65147e-07 4.23658e-07 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 84.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50505 ( -8.49495 1.03499 )
beta : -1.75447 ( -2.671695E-02 2.661276E-02) )
Epeak [keV] : 31.5173 ( -241.020 9758.88 )
Norm@50keV : 5.805743E-02 ( -1.877148E-03 107.101 )
------------------------------------------------------------
Chi-Squared = 20.30175 using 59 PHA bins.
Reduced chi-squared = 0.3691227 for 55 degrees of freedom
Null hypothesis probability = 1.000
Photon flux (15-150 keV) in 84.31 sec: 4.60320 ( -0.05782 1.24749 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62951e-05 ( -3.81587e-07 4.22562e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 40.708 sec. to 41.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65183 ( -3.190196E-02 3.188717E-02) )
Norm@50keV : 0.330685 ( -5.584568E-03 5.581230E-03) )
------------------------------------------------------------
Chi-Squared = 81.67337 using 59 PHA bins.
Reduced chi-squared = 1.432866 for 57 degrees of freedom
Null hypothesis probability = 1.773E-02
Photon flux (15-150 keV) in 1.000 sec: 43.2055 ( -0.9328 0.9384 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07494e-06 ( -5.0822e-08 5.0816e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.708 sec. to 41.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13021 ( -0.148076 0.143677 )
Epeak [keV] : 101.919 ( -9.90759 16.0475 )
Norm@50keV : 0.540058 ( -6.682652E-02 7.863384E-02) )
------------------------------------------------------------
Chi-Squared = 40.55656 using 59 PHA bins.
Reduced chi-squared = 0.7242244 for 56 degrees of freedom
Null hypothesis probability = 0.940
Photon flux (15-150 keV) in 1.000 sec: 40.8667 ( -1.0729 1.0863 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99765e-06 ( -5.5093e-08 5.5007e-08 ) ergs/cm2
Band function
Time interval is from 40.708 sec. to 41.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.13045 ( -0.143405 0.148365 )
beta : -9.21285 ( -0.787154 7.16653 )
Epeak [keV] : 101.921 ( -9.92020 16.0239 )
Norm@50keV : 0.539879 ( -6.669876E-02 7.879561E-02) )
------------------------------------------------------------
Chi-Squared = 40.55712 using 59 PHA bins.
Reduced chi-squared = 0.7374021 for 55 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 1.000 sec: 40.8674 ( -1.0742 1.0854 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99511e-06 ( -5.503e-08 5.4854e-08 ) ergs/cm2
Plot creation:
Sat Apr 12 14:23:10 EDT 2008