batgrbproduct Analysis for Trigger=348720
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): Tue Nov 24 10:20:00 EST 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/348720
======================================================================
Trigger: 00348720 Segment: 000
BAT Trigger Time: 260895736 [s; MET]
Trigger Stop: 260895800 [s; MET]
UTC: 2009-04-08T15:02:11.357900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.617816208264 Dec: 37.5641345926912 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 231.617816208264 Dec: 37.5641345926912 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.575856739155 Dec: 37.5491880327654 [deg; J2000]
{ 15h 26m 18.2s , +37d 32' 57.1" }
+/- 4.40552775968462 [arcmin] (estimated 90% radius based on SNR)
+/- 2.96667136220328 [arcmin] (formal 1-sigma fit error)
SNR: 3.65696934489373
Angular difference between Flight and Ground position is 2.188030 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/- 0.004
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/- 0.004
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.234392 0.064348 0.011382 -0.012063
0.036990 0.038347 0.034670 0.030825 [error]
Peak 0.234392 0.064348 0.011382 -0.012063
0.036990 0.038347 0.034670 0.030825 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary (tot_pha/preslew_drm) ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 4.67e-08 3.90e-08 2.21e-08 1.86e-08 1.16e-07 1.27e-07 erg/cm2
Error 1.47e-08 1.71e-08 1.87e-08 3.26e-08 5.04e-08 6.80e-08 erg/cm2
Peak flux Power-law 2.42e-02 1.13e-02 3.21e-03 1.14e-03 3.94e-02 3.98e-02 ph/cm2/s
Error 7.71e-03 4.76e-03 3.19e-03 1.86e-03 1.26e-02 1.30e-02 ph/cm2/s
Fluence Cutoff-PL 5.58e-08 3.64e-08 1.18e-09 1.77e-13 9.35e-08 9.36e-08 erg/cm2
Error 1.66e-08 1.51e-08 6.44e-09 3.33e-10 3.03e-08 2.89e-08 erg/cm2
Peak flux Cutoff-PL 2.84e-02 1.13e-02 2.01e-04 1.54e-08 3.99e-02 3.99e-02 ph/cm2/s
Error 8.63e-03 5.90e-03 1.02e-03 2.88e-05 1.14e-02 1.14e-02 ph/cm2/s
Fluence Band 5.06e-08 4.42e-08 5.77e-09 6.26e-11 9.73e-08 1.06e-07 erg/cm2
Error 1.46e-08 1.45e-08 3.08e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.55e-02 1.27e-02 1.65e-03 4.09e-05 3.99e-02 3.99e-02 ph/cm2/s
Error 7.59e-03 3.41e-03 1.42e-03 1.27e-03 1.19e-02 1.18e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.828 0.727 - - 1.62e-04 1.39e-04 61.584 57
CPL -2.492 0.000 20.6 4.4 2.15e+00 8.16e+00 56.720 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.828 0.727 - - 1.62e-04 1.39e-04 61.584 57
CPL -2.492 0.000 20.6 4.4 2.15e+00 8.16e+00 56.720 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bgd subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.5759 +37.5492 0.0525 6.5 153.2 0.2729 3.7 TRIG_00348720
------------------------------------------
Foreground time interval of the image:
260895736.000000 260895800.000000
Background time interval of the image:
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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Flight mask-tagged light curves
Quad-rate summed light curves (from T0-300 to T0+1000)
Spectral Evolution
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82799 ( -0.640659 0.814307 )
Norm@50keV : 1.615931E-04 ( -1.615931E-04 1.160366E-04) )
------------------------------------------------------------
Chi-Squared = 61.58354 using 59 PHA bins.
Reduced chi-squared = 1.080413 for 57 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 64.00 sec: 3.939789E-02 ( -0.0124678 0.0127608 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15933e-07 ( -4.55763e-08 5.51373e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49207 ( )
Epeak [keV] : 20.5725 ( -3.92288 4.92668 )
Norm@50keV : 2.15050 ( -4.21747 12.0988 )
------------------------------------------------------------
Chi-Squared = 56.72020 using 59 PHA bins.
but latest trial 1.57762 gives Chi-Squared = 0.368809
Reduced chi-squared = 1.012861 for 56 degrees of freedom
Null hypothesis probability = 0.448
Photon flux (15-150 keV) in 64.00 sec: 3.990004E-02 ( -0.0113794 0.0114717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34784e-08 ( -2.92045e-08 3.13248e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34100 ( -8.65900 1.60265 )
beta : -9.00409 ( -0.995911 6.55475 )
Epeak [keV] : 12.0256 ( -6.02040 5.94186 )
Norm@50keV : 2.072171E-03 ( -91.3543 28.4639 )
------------------------------------------------------------
Chi-Squared = 59.47539 using 59 PHA bins.
Reduced chi-squared = 1.081371 for 55 degrees of freedom
Null hypothesis probability = 0.316
Photon flux (15-150 keV) in 64.00 sec: 3.989189E-02 ( -0.0119336 0.0119126 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7335e-08 ( -2.92838e-08 3.23501e-08 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82799 ( -0.640659 0.814307 )
Norm@50keV : 1.615931E-04 ( -1.615931E-04 1.160366E-04) )
------------------------------------------------------------
Chi-Squared = 61.58354 using 59 PHA bins.
Reduced chi-squared = 1.080413 for 57 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 64.00 sec: 3.939789E-02 ( -0.0124678 0.0127608 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15933e-07 ( -4.55763e-08 5.51373e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49207 ( )
Epeak [keV] : 20.5725 ( -3.92288 4.92668 )
Norm@50keV : 2.15050 ( -4.21747 12.0988 )
------------------------------------------------------------
Chi-Squared = 56.72020 using 59 PHA bins.
but latest trial 1.57762 gives Chi-Squared = 0.368809
Reduced chi-squared = 1.012861 for 56 degrees of freedom
Null hypothesis probability = 0.448
Photon flux (15-150 keV) in 64.00 sec: 3.990004E-02 ( -0.0113794 0.0114717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34784e-08 ( -2.92045e-08 3.13248e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34100 ( -8.65900 1.60265 )
beta : -9.00409 ( -0.995911 19.0040 )
Epeak [keV] : 12.0256 ( -6.00642 5.94186 )
Norm@50keV : 2.072171E-03 ( -91.3543 28.4639 )
------------------------------------------------------------
Chi-Squared = 59.47539 using 59 PHA bins.
Reduced chi-squared = 1.081371 for 55 degrees of freedom
Null hypothesis probability = 0.316
Photon flux (15-150 keV) in 64.00 sec: 3.989189E-02 ( -0.0119336 0.0119126 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7335e-08 ( -2.92838e-08 3.23501e-08 ) ergs/cm2
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82799 ( -0.640659 0.814307 )
Norm@50keV : 1.615931E-04 ( -1.615931E-04 1.160366E-04) )
------------------------------------------------------------
Chi-Squared = 61.58354 using 59 PHA bins.
Reduced chi-squared = 1.080413 for 57 degrees of freedom
Null hypothesis probability = 0.315
Photon flux (15-150 keV) in 64.00 sec: 3.939789E-02 ( -0.0124678 0.0127608 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15933e-07 ( -4.55763e-08 5.51373e-08 ) ergs/cm2
Cutoff power-law model
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49207 ( )
Epeak [keV] : 20.5725 ( -3.92288 4.92668 )
Norm@50keV : 2.15050 ( -4.21747 12.0988 )
------------------------------------------------------------
Chi-Squared = 56.72020 using 59 PHA bins.
but latest trial 1.57762 gives Chi-Squared = 0.368809
Reduced chi-squared = 1.012861 for 56 degrees of freedom
Null hypothesis probability = 0.448
Photon flux (15-150 keV) in 64.00 sec: 3.990004E-02 ( -0.0113794 0.0114717 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34784e-08 ( -2.92045e-08 3.13248e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34100 ( -8.65900 1.60265 )
beta : -9.00409 ( -0.995911 19.0040 )
Epeak [keV] : 12.0256 ( -5.95831 5.94186 )
Norm@50keV : 2.072171E-03 ( -91.3543 28.4639 )
------------------------------------------------------------
Chi-Squared = 59.47539 using 59 PHA bins.
Reduced chi-squared = 1.081371 for 55 degrees of freedom
Null hypothesis probability = 0.316
Photon flux (15-150 keV) in 64.00 sec: 3.989189E-02 ( -0.0119336 0.0119126 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.7335e-08 ( -2.92838e-08 3.23501e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 3.89695e-08
S(50-100 keV) = 2.21325e-08
T90 vs. Hardness ratio plot
T90 = 64 sec.
Hardness ratio = 0.567944
Color vs. Color plot
Count ratio (25-50 keV) / (15-25 keV) = 0.274532
Count ratio (100-50 keV) / (15-25 keV) = 0.0485597
DPI of the refined source position
IMX = -1.020198585321273E-01, IMY = -5.146881838923514E-02
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image is from 0.000 sec. to 0.000 sec.
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image is from 0.000 sec. to 64.000 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.4576 +35.3425 0.0000 12.4 -51.3 0.1152 1.6 Her X-1
268.3680 -1.4526 0.0000 45.8 -0.2 0.3264 2.1 SW J1753.5-0127
288.7983 +10.9456 0.0000 51.0 -31.4 0.9569 4.0 GRS 1915+105
155.0356 +59.8520 0.0498 57.1 -174.0 1.3244 3.8 UNKNOWN
276.0343 +35.0455 0.0392 29.8 -57.6 0.4937 4.9 UNKNOWN
------------------------------------------
Post-slew image of 15-350 keV band
Time interval of the image is from 297.101 sec. to 764.301 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5903 +35.2016 0.0000 45.2 146.2 19.9528 18.9 Cyg X-1
308.1103 +40.9526 0.0000 45.7 158.6 3.5257 4.4 Cyg X-3
326.1717 +38.3217 0.0000 39.0 177.1 0.1249 0.3 Cyg X-2
5.4464 -41.6317 0.0531 52.5 -33.2 4.1731 3.6 UNKNOWN
9.9506 -17.3942 0.0639 43.5 -64.2 5.2403 3.0 UNKNOWN
10.2156 -26.1041 0.0619 47.1 -53.0 4.7989 3.1 UNKNOWN
289.9877 -6.8310 0.0380 39.5 80.7 6.5932 5.1 UNKNOWN
315.5637 +12.7361 0.0393 18.9 136.1 1.4592 4.9 UNKNOWN
322.3982 +34.6377 0.0571 35.8 171.3 1.3235 3.4 UNKNOWN
------------------------------------------