batgrbproduct Analysis for Trigger=348650
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 v2.44
Process Start Time (local time): Tue Apr 7 19:23:54 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348650/GCN5_download_cron
======================================================================
Trigger: 00348650 Segment: 000
BAT Trigger Time: 260792910.272 [s; MET]
Trigger Stop: 260792912.32 [s; MET]
UTC: 2009-04-07T10:28:25.633160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 68.9590365303165 Dec: -12.6649961806079 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: NO
Rate S/N Ratio: 12.4498995979887 [ if not an image trigger ]
Image S/N Ratio: 8.43
Flight Position: [ source = BAT ]
RA: 68.9590365303165 Dec: -12.6649961806079 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 68.9785982128258 Dec: -12.6837990599888 [deg; J2000]
{ 04h 35m 54.9s , -12d 41' 01.7" }
+/- 2.16696983001464 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03457789584122 [arcmin] (formal 1-sigma fit error)
SNR: 10.0769376888119
Angular difference between Flight and Ground position is 1.607492 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 252.207999974489 +/- 48.109316858525
Measured from: -12.0399999320507
to: 240.168000042439 [s; relative to TRIGTIME]
T50: 205.199999988079 +/- 34.8631739274065
Measured from: 0.648000061511993
to: 205.848000049591 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.443999975919724
to: 1.44399997591972 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.6720000207424
to: 306.231999993324 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.679227 0.611574 0.441851 0.060806
0.093128 0.094041 0.087168 0.085369 [error]
Peak 0.007885 0.036793 0.025200 0.014071
0.005696 0.006051 0.005765 0.005570 [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 1.82e-07 2.84e-07 3.34e-07 7.61e-07 1.02e-06 1.56e-06 erg/cm2
Error 4.19e-08 4.36e-08 8.52e-08 3.99e-07 1.96e-07 4.83e-07 erg/cm2
Peak flux Power-law 1.37e-01 1.91e-01 1.96e-01 3.69e-01 6.42e-01 8.94e-01 ph/cm2/s
Error 6.00e-02 5.17e-02 4.38e-02 1.80e-01 1.40e-01 2.07e-01 ph/cm2/s
Fluence Cutoff-PL 1.80e-07 2.88e-07 3.35e-07 6.49e-07 1.01e-06 1.41e-06 erg/cm2
Error 4.51e-08 3.43e-08 8.63e-08 6.09e-07 1.96e-07 6.15e-07 erg/cm2
Peak flux Cutoff-PL 1.20e-01 1.99e-01 2.09e-01 2.05e-01 6.28e-01 7.33e-01 ph/cm2/s
Error 4.95e-02 5.85e-02 5.22e-02 2.45e-01 1.06e-01 2.79e-01 ph/cm2/s
Fluence Band 1.80e-07 2.84e-07 3.33e-07 7.51e-07 1.02e-06 1.56e-06 erg/cm2
Error 4.56e-08 4.57e-08 6.46e-08 3.80e-07 1.97e-07 5.23e-07 erg/cm2
Peak flux Band 1.20e-01 1.99e-01 2.09e-01 2.04e-01 6.28e-01 7.32e-01 ph/cm2/s
Error 6.77e-02 5.85e-02 5.24e-02 2.45e-01 1.42e-01 3.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.765 0.295 - - 3.43e-04 6.33e-05 53.258 57
CPL 1.278 0.000 67.9 0.0 6.28e-04 6.20e-04 53.668 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.959 0.367 - - 5.58e-03 1.20e-03 49.967 57
CPL 0.377 1.260 153.6 5000.0 1.04e-02 2.91e-02 49.345 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: 2.304000 sec.
T50 in the 50-300 keV band: 1.280000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 323.904 -17.672 306.232
T90 252.208 -12.040 240.168
T50 205.200 0.648 205.848
Peak 1.000 0.444 1.444
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
68.9786 -12.6838 0.0191 26.8 0.8 0.8342 10.1 TRIG_00348650
------------------------------------------
Foreground time interval of the image:
-17.672 27.329 (delta_t = 45.001 [sec])
Background time interval of the image:
-239.272 -17.672 (delta_t = 221.600 [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
Multiple GTIs in the spectrum
tstart tstop
-17.672000 131.728000
132.728000 306.232000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76470 ( -0.285221 0.304320 )
Norm@50keV : 3.432014E-04 ( -6.449039E-05 6.213429E-05) )
------------------------------------------------------------
Chi-Squared = 53.25822 using 59 PHA bins.
Reduced chi-squared = 0.9343548 for 57 degrees of freedom
Null hypothesis probability = 0.616
Photon flux (15-150 keV) in 322.9 sec: 4.666050E-02 ( -0.0071749 0.00717593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02166e-06 ( -1.93146e-07 1.99555e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-17.672000 131.728000
132.728000 306.232000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27780 ( )
Epeak [keV] : 67.9300 ( )
Norm@50keV : 6.280751E-04 ( -1.000727E-04 1.140147E-03) )
------------------------------------------------------------
Chi-Squared = 53.66824 using 59 PHA bins.
Reduced chi-squared = 0.9583613 for 56 degrees of freedom
Null hypothesis probability = 0.564
Photon flux (15-150 keV) in 322.9 sec: 4.664519E-02 ( -0.0071726 0.00717351 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01326e-06 ( -1.86233e-07 2.05949e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-17.672000 131.728000
132.728000 306.232000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52584 ( -7.37931 6.31385 )
beta : -9.33522 ( -0.304312 0.285249 )
Epeak [keV] : 90.7726 ( -90.6726 9909.23 )
Norm@50keV : 4.626259E-04 ( -8.769728E-03 8.446112E-03) )
------------------------------------------------------------
Chi-Squared = 53.30234 using 59 PHA bins.
Reduced chi-squared = 0.9691335 for 55 degrees of freedom
Null hypothesis probability = 0.540
Photon flux (15-150 keV) in 322.9 sec: 4.648759E-02 ( -0.00739084 0.00729038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02081e-06 ( -1.95484e-07 1.97883e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.440 sec. to 1.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.959366 ( -0.382698 0.351740 )
Norm@50keV : 5.584026E-03 ( -1.207883E-03 1.194401E-03) )
------------------------------------------------------------
Chi-Squared = 49.96732 using 59 PHA bins.
Reduced chi-squared = 0.8766196 for 57 degrees of freedom
Null hypothesis probability = 0.734
Photon flux (15-150 keV) in 1.008 sec: 0.641720 ( -0.139268 0.140206 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17984e-08 ( -1.38777e-08 1.39897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.440 sec. to 1.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.376549 ( -1.63222 0.888363 )
Epeak [keV] : 153.567 ( -153.557 9846.43 )
Norm@50keV : 1.040854E-02 ( -1.040854E-02 4.771737E-02) )
------------------------------------------------------------
Chi-Squared = 49.34536 using 59 PHA bins.
Reduced chi-squared = 0.8811671 for 56 degrees of freedom
Null hypothesis probability = 0.723
Photon flux (15-150 keV) in 1.008 sec: 0.628473 ( -0.14137 0.071517 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96485e-08 ( -1.52749e-08 1.47539e-08 ) ergs/cm2
Band function
Time interval is from 0.440 sec. to 1.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.381340 ( -9.61866 1.52713 )
beta : -7.77342 ( -1.54585 5.92610 )
Epeak [keV] : 154.395 ( -154.452 9845.45 )
Norm@50keV : 1.035959E-02 ( -7.123637E-09 0.147848 )
------------------------------------------------------------
Chi-Squared = 49.34528 using 59 PHA bins.
Reduced chi-squared = 0.8971868 for 55 degrees of freedom
Null hypothesis probability = 0.690
Photon flux (15-150 keV) in 1.008 sec: 0.628349 ( -0.141184 0.142856 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88893e-08 ( -1.36742e-08 1.36924e-08 ) ergs/cm2
Plot creation:
Tue Apr 7 19:41:27 EDT 2009