batgrbproduct Analysis for Trigger=375246
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 v2.45
Process Start Time (local time): Mon Nov 9 11:55:46 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger375246/GCN5_download_cron
======================================================================
Trigger: 00375246 Segment: 000
BAT Trigger Time: 279435468.608 [s; MET]
Trigger Stop: 279435484.992 [s; MET]
UTC: 2009-11-09T04:57:43.363760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 309.264961145751 Dec: -44.1765036048656 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.64
Image Trigger?: NO
Rate S/N Ratio: 13.5277492584687 [ if not an image trigger ]
Image S/N Ratio: 7.64
Flight Position: [ source = BAT ]
RA: 309.264961145751 Dec: -44.1765036048656 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 309.25210489108 Dec: -44.1766709312203 [deg; J2000]
{ 20h 37m 00.5s , -44d 10' 36.0" }
+/- 2.09859101456236 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0859874459328 [arcmin] (formal 1-sigma fit error)
SNR: 10.5492481883972
Angular difference between Flight and Ground position is 0.553318 arcmin
Partial Coding Fraction: 0.1972656 [ including projection effects ]
Duration
T90: 47.6960000395775 +/- 16.7081067781536
Measured from: 0.408000111579895
to: 48.1040001511574 [s; relative to TRIGTIME]
T50: 14.9120000004768 +/- 8.89923682328839
Measured from: 7.86400014162064
to: 22.7760001420975 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.2039999961853
to: 9.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.839999973773956
to: 51.4640000462532 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.559179 0.774408 0.679760 0.331307
0.104593 0.104369 0.088444 0.075309 [error]
Peak 0.023283 0.061413 0.045352 0.027881
0.014506 0.014708 0.012674 0.010560 [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 1.76e-07 3.64e-07 5.86e-07 2.11e-06 1.62e-06 3.24e-06 erg/cm2
Error 5.05e-08 6.02e-08 8.66e-08 7.56e-07 2.19e-07 7.85e-07 erg/cm2
Peak flux Power-law 3.92e-01 4.13e-01 3.08e-01 3.72e-01 1.26e+00 1.48e+00 ph/cm2/s
Error 2.21e-01 1.44e-01 1.02e-01 2.68e-01 3.94e-01 4.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.76e-07 3.64e-07 5.87e-07 2.10e-06 1.62e-06 3.22e-06 erg/cm2
Error 5.05e-08 6.03e-08 8.68e-08 7.51e-07 2.19e-07 7.80e-07 erg/cm2
Peak flux Cutoff-PL 3.91e-01 4.13e-01 3.08e-01 3.70e-01 1.25e+00 1.48e+00 ph/cm2/s
Error 2.21e-01 1.44e-01 1.02e-01 2.66e-01 3.94e-01 4.26e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.312 0.252 - - 3.15e-03 4.15e-04 60.010 57
CPL 1.309 0.255 10000.0 0.0 3.16e-03 4.16e-04 60.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.422 0.533 - - 1.03e-02 2.95e-03 59.650 57
CPL 3.237 0.000 339.8 0.0 1.01e-03 0.00e+00 59.420 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: 16.320000 sec.
T50 in the 50-300 keV band: 8.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 52.304 -0.840 51.464
T90 47.696 0.408 48.104
T50 14.912 7.864 22.776
Peak 1.000 8.204 9.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
309.2521 -44.1767 0.0182 47.4 162.8 2.2950 10.5 TRIG_00375246
------------------------------------------
Foreground time interval of the image:
-0.840 51.464 (delta_t = 52.304 [sec])
Background time interval of the image:
-239.608 -0.840 (delta_t = 238.768 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.840 sec. to 51.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31245 ( -0.256898 0.247612 )
Norm@50keV : 3.14989E-03 ( -0.000416606 0.000414124 )
------------------------------------------------------------
# Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.672845e-01
Photon flux (15-150 keV) in 52.3 sec: 0.376665 ( -0.0553231 0.0557482 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62303e-06 ( -2.18445e-07 2.19243e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.840 sec. to 51.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30895 ( -0.277404 0.232212 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 3.16289E-03 ( -0.000417395 0.000415159 )
------------------------------------------------------------
# Chi-Squared = 60.03 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 56 degrees of freedom
# Null hypothesis probability = 3.317937e-01
Photon flux (15-150 keV) in 52.3 sec: 0.376481 ( -0.055305 0.055729 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62333e-06 ( -2.18541e-07 2.19351e-07 ) ergs/cm2
Band function
Time interval is from -0.840 sec. to 51.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01135 ( 1.01151 1.01151 )
beta : -1.31226 ( 1.31234 0.257226 )
Epeak [keV] : 51.2598 ( -51.0659 -51.0659 )
Norm@50keV : 6.04218E-03 ( -0.00604662 1.53323 )
------------------------------------------------------------
# Chi-Squared = 60.01 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 55 degrees of freedom
# Null hypothesis probability = 2.991682e-01
Photon flux (15-150 keV) in 52.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.200 sec. to 9.208 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42202 ( -0.544434 0.521083 )
Norm@50keV : 1.02541E-02 ( -0.002947 0.00294546 )
------------------------------------------------------------
# Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.794036e-01
Photon flux (15-150 keV) in 1.008 sec: 1.25516 ( -0.391238 0.396917 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94361e-08 ( -2.98344e-08 3.00561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.200 sec. to 9.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.23676 ( )
Epeak [keV] : 339.776 ( )
Norm@50keV : 1.01063E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.521854e-01
Photon flux (15-150 keV) in 1.008 sec: 1.25469 ( -0.391078 0.3968 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94607e-08 ( -2.98468e-08 3.00704e-08 ) ergs/cm2
Band function
Time interval is from 8.200 sec. to 9.208 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.584981 ( 0.85244 0.85244 )
beta : -1.50224 ( 1.49132 0.606231 )
Epeak [keV] : 60.4587 ( -59.1305 578.454 )
Norm@50keV : 3.31187E-02 ( -0.0349036 730.282 )
------------------------------------------------------------
# Chi-Squared = 59.57 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.128912e-01
Photon flux (15-150 keV) in 1.008 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon Nov 9 12:24:28 EST 2009