batgrbproduct Analysis for Trigger=352420
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): Mon May 18 10:51:52 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger352420/GCN5_download_cron
======================================================================
Trigger: 00352420 Segment: 000
BAT Trigger Time: 264304489.024 [s; MET]
Trigger Stop: 264304489.28 [s; MET]
UTC: 2009-05-18T01:54:44.273640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 119.933320952001 Dec: 0.767979769129691 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.03
Image Trigger?: NO
Rate S/N Ratio: 14.6287388383278 [ if not an image trigger ]
Image S/N Ratio: 9.03
Flight Position: [ source = BAT ]
RA: 119.933320952001 Dec: 0.767979769129691 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 119.949229062035 Dec: 0.777874402093823 [deg; J2000]
{ 07h 59m 47.8s , +00d 46' 40.3" }
+/- 1.30514147337468 [arcmin] (estimated 90% radius based on SNR)
+/- 0.539773996745922 [arcmin] (formal 1-sigma fit error)
SNR: 20.791855623212
Angular difference between Flight and Ground position is 1.123981 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 85.8880000114441 +/- 24.4210112852475
Measured from: -1.1999998986721
to: 84.688000112772 [s; relative to TRIGTIME]
T50: 38.6559999883175 +/- 32.3862766031964
Measured from: 0.336000114679337
to: 38.9920001029968 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0679999887943268
to: 0.932000011205673 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.47999998927116
to: 93.3280000090599 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.314466 0.400086 0.239263 0.165140
0.052497 0.051755 0.045818 0.040466 [error]
Peak 0.073757 0.103220 0.068724 0.019434
0.007130 0.007570 0.006838 0.005138 [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 9.72e-08 1.69e-07 2.24e-07 6.06e-07 6.53e-07 1.10e-06 erg/cm2
Error 2.36e-08 2.47e-08 4.72e-08 2.78e-07 1.11e-07 3.16e-07 erg/cm2
Peak flux Power-law 7.85e-01 7.74e-01 5.34e-01 5.82e-01 2.33e+00 2.67e+00 ph/cm2/s
Error 1.11e-01 6.81e-02 6.04e-02 1.33e-01 1.98e-01 2.30e-01 ph/cm2/s
Fluence Cutoff-PL 9.72e-08 1.69e-07 2.24e-07 6.01e-07 6.53e-07 1.09e-06 erg/cm2
Error 2.36e-08 2.48e-08 4.73e-08 2.76e-07 1.11e-07 3.14e-07 erg/cm2
Peak flux Cutoff-PL 7.63e-01 7.89e-01 5.41e-01 4.62e-01 2.31e+00 2.56e+00 ph/cm2/s
Error 1.29e-01 8.24e-02 5.03e-02 2.44e-01 2.02e-01 2.49e-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 1.592 0.274 - - 7.29e-04 1.12e-04 71.580 57
CPL 2.225 0.365 84.2 0.0 3.49e-04 0.00e+00 71.190 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.534 0.149 - - 1.84e-02 1.63e-03 68.760 57
CPL 1.356 0.481 175.5 0.0 2.29e-02 1.69e-02 68.500 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: 2.624000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 95.808 -2.480 93.328
T90 85.888 -1.200 84.688
T50 38.656 0.336 38.992
Peak 1.000 -0.068 0.932
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
119.9492 +0.7779 0.0092 26.9 -45.7 0.7975 20.8 TRIG_00352420
------------------------------------------
Foreground time interval of the image:
-2.480 8.477 (delta_t = 10.957 [sec])
Background time interval of the image:
-239.024 -2.480 (delta_t = 236.544 [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 -2.480 sec. to 93.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59223 ( -0.270313 0.276919 )
Norm@50keV : 7.28520E-04 ( -0.000113746 0.000111207 )
------------------------------------------------------------
# Chi-Squared = 71.58 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.261793e-02
Photon flux (15-150 keV) in 95.81 sec: 9.33948E-02 ( -0.013535 0.0135637 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53401e-07 ( -1.09609e-07 1.11742e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.480 sec. to 93.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22550 ( -0.46619 0.263031 )
Epeak [keV] : 84.1730 ( -9995.83 -9995.83 )
Norm@50keV : 3.48821E-04 ( )
------------------------------------------------------------
# Chi-Squared = 71.19 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 56 degrees of freedom
# Null hypothesis probability = 8.304761e-02
Photon flux (15-150 keV) in 95.81 sec: 9.33590E-02 ( -0.0135304 0.013559 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53338e-07 ( -1.09623e-07 1.11766e-07 ) ergs/cm2
Band function
Time interval is from -2.480 sec. to 93.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30485 ( 1.30485 1.30485 )
beta : -1.59218 ( -0.277275 0.270686 )
Epeak [keV] : 17.4449 ( -17.4449 -17.4449 )
Norm@50keV : 1.69388E-03 ( -0.00169388 2061.59 )
------------------------------------------------------------
# Chi-Squared = 71.58 using 59 PHA bins.
# Reduced chi-squared = 1.301 for 55 degrees of freedom
# Null hypothesis probability = 6.590991e-02
Photon flux (15-150 keV) in 95.81 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 -0.048 sec. to 0.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53437 ( -0.147643 0.149975 )
Norm@50keV : 1.84499E-02 ( -0.00163548 0.00162254 )
------------------------------------------------------------
# Chi-Squared = 68.76 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.366500e-01
Photon flux (15-150 keV) in 0.96 sec: 2.32522 ( -0.197566 0.197705 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67123e-07 ( -1.62073e-08 1.63626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35603 ( -0.649258 0.312506 )
Epeak [keV] : 175.486 ( -175.597 -175.597 )
Norm@50keV : 2.28575E-02 ( -0.00747671 0.0262651 )
------------------------------------------------------------
# Chi-Squared = 68.50 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 56 degrees of freedom
# Null hypothesis probability = 1.220556e-01
Photon flux (15-150 keV) in 0.96 sec: 2.30827 ( -0.20482 0.2 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64727e-07 ( -1.836e-08 8.9808e-09 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 0.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.964703 ( 0.918107 0.918107 )
beta : -1.68392 ( 1.699 0.281923 )
Epeak [keV] : 72.4890 ( -68.9166 -68.9166 )
Norm@50keV : 3.94641E-02 ( -0.0239691 495.606 )
------------------------------------------------------------
# Chi-Squared = 67.77 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 55 degrees of freedom
# Null hypothesis probability = 1.157222e-01
Photon flux (15-150 keV) in 0.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Mon May 18 11:13:06 EDT 2009