batgrbproduct Analysis for Trigger=340573
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 v2.42
Process Start Time (local time): Thu Jan 22 12:42:06 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340573/GCN5_download_cron
======================================================================
Trigger: 00340573 Segment: 000
BAT Trigger Time: 254280765.984 [s; MET]
Trigger Stop: 254280766.048 [s; MET]
UTC: 2009-01-22T01:32:41.548400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.705247586623 Dec: -54.3196370090835 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.86
Image Trigger?: NO
Rate S/N Ratio: 192.553888561099 [ if not an image trigger ]
Image S/N Ratio: 22.86
Flight Position: [ source = BAT ]
RA: 237.705247586623 Dec: -54.3196370090835 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.676495322939 Dec: -54.3093936966005 [deg; J2000]
{ 15h 50m 42.4s , -54d 18' 33.8" }
+/- 2.47159956745868 [arcmin] (estimated 90% radius based on SNR)
+/- 1.51244639826335 [arcmin] (formal 1-sigma fit error)
SNR: 8.35066533813888
Angular difference between Flight and Ground position is 1.179168 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 358.608000010252 +/- 152.320003369088
Measured from: -44.107999920845
to: 314.500000089407 [s; relative to TRIGTIME]
T50: 206.100000023842 +/- 16.668001932476
Measured from: -44.0759999155998
to: 162.024000108242 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -44.1800000071526
to: -43.1800000071526 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.136000007391
to: 446.800000011921 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.299519 3.208730 1.229901 0.194502
0.223766 0.219549 0.197784 0.186483 [error]
Peak 1.718786 1.738947 0.584372 0.020210
0.049005 0.049074 0.028739 0.014397 [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 1.29e-06 1.44e-06 1.15e-06 1.53e-06 4.45e-06 5.41e-06 erg/cm2
Error 1.41e-07 1.21e-07 1.81e-07 4.58e-07 4.22e-07 6.92e-07 erg/cm2
Peak flux Power-law 2.90e+01 1.45e+01 4.44e+00 1.73e+00 4.89e+01 4.97e+01 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
Fluence Cutoff-PL 1.18e-06 1.64e-06 9.85e-07 2.17e-07 3.98e-06 4.03e-06 erg/cm2
Error 1.60e-07 1.67e-07 2.36e-07 2.72e-07 4.45e-07 5.26e-07 erg/cm2
Peak flux Cutoff-PL 2.25e+01 1.72e+01 4.63e+00 3.62e-01 4.46e+01 4.47e+01 ph/cm2/s
Error 1.96e+00 7.66e-01 3.32e-01 1.21e-01 2.24e+00 2.25e+00 ph/cm2/s
Fluence Band 1.17e-06 1.63e-06 9.85e-07 3.10e-07 4.00e-06 4.11e-06 erg/cm2
Error 1.56e-07 1.63e-07 2.01e-07 5.75e-07 4.19e-07 7.06e-07 erg/cm2
Peak flux Band 2.25e+01 1.72e+01 4.63e+00 3.62e-01 4.46e+01 4.47e+01 ph/cm2/s
Error 9.72e-01 7.20e-01 2.73e-01 1.87e-01 1.98e+00 1.41e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.322 0.162 - - 9.50e-04 1.09e-04 64.099 57
CPL 1.030 0.829 28.6 10.5 5.75e-03 1.01e-02 54.797 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.706 0.000 - - 2.18e-01 0.00e+00 144.286 57
CPL 0.822 0.395 27.3 3.8 2.41e+00 1.29e+00 47.847 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: 462.144000 sec.
T50 in the 50-300 keV band: 288.832000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 490.936 -44.136 446.800
T90 358.608 -44.108 314.500
T50 206.100 -44.076 162.024
Peak 1.000 -44.180 -43.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.6765 -54.3094 0.0231 43.6 -144.5 4.6437 8.4 TRIG_00340573
------------------------------------------
Foreground time interval of the image:
-17.483 233.076 (delta_t = 250.559 [sec])
234.016 245.296 (delta_t = 11.280 [sec])
246.016 422.631 (delta_t = 176.615 [sec])
424.016 446.800 (delta_t = 22.784 [sec])
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
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
-44.136000 233.076000
234.016000 245.296000
246.016000 422.630700
424.016000 446.800000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32221 ( -0.157940 0.166339 )
Norm@50keV : 9.496715E-04 ( -1.093674E-04 1.080824E-04) )
------------------------------------------------------------
Chi-Squared = 64.09914 using 59 PHA bins.
Reduced chi-squared = 1.124546 for 57 degrees of freedom
Null hypothesis probability = 0.242
Photon flux (15-150 keV) in 487.9 sec: 0.168038 ( -0.013734 0.013742 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44628e-06 ( -4.18599e-07 4.264e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-44.136000 233.076000
234.016000 245.296000
246.016000 422.630700
424.016000 446.800000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02970 ( -0.896769 0.760237 )
Epeak [keV] : 28.6247 ( -14.5790 6.34420 )
Norm@50keV : 5.747698E-03 ( -5.747698E-03 1.451049E-02) )
------------------------------------------------------------
Chi-Squared = 54.79739 using 59 PHA bins.
Reduced chi-squared = 0.9785249 for 56 degrees of freedom
Null hypothesis probability = 0.520
Photon flux (15-150 keV) in 487.9 sec: 0.160319 ( -0.014224 0.014314 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98181e-06 ( -4.26268e-07 4.63339e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-44.136000 233.076000
234.016000 245.296000
246.016000 422.630700
424.016000 446.800000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27050 ( -0.585833 3.67572 )
beta : -4.05635 ( -5.94365 1.43184 )
Epeak [keV] : 25.7052 ( -13.8116 5.69545 )
Norm@50keV : 4.238946E-03 ( -4.330515E-03 3.85574 )
------------------------------------------------------------
Chi-Squared = 55.04512 using 59 PHA bins.
Reduced chi-squared = 1.000820 for 55 degrees of freedom
Null hypothesis probability = 0.473
Photon flux (15-150 keV) in 487.9 sec: 0.160544 ( -0.007249 0.014212 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99775e-06 ( -3.86446e-07 4.52166e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -44.136 sec. to -43.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.70624 ( )
Norm@50keV : 0.218347 ( )
------------------------------------------------------------
Chi-Squared = 144.2855 using 59 PHA bins.
Reduced chi-squared = 2.531324 for 57 degrees of freedom
Null hypothesis probability = 1.634E-09
Photon flux (15-150 keV) in 0.9120 sec: 48.9343 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12305e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.136 sec. to -43.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.822362 ( -0.409895 0.379245 )
Epeak [keV] : 27.2751 ( -4.31031 3.19721 )
Norm@50keV : 2.41461 ( -0.921052 1.66141 )
------------------------------------------------------------
Chi-Squared = 47.84708 using 59 PHA bins.
Reduced chi-squared = 0.8544122 for 56 degrees of freedom
Null hypothesis probability = 0.773
Photon flux (15-150 keV) in 0.9120 sec: 44.6342 ( -2.2351 2.2513 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98738e-06 ( -8.46336e-08 8.50814e-08 ) ergs/cm2
Band function
Time interval is from -44.136 sec. to -43.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24557 ( -0.533449 0.333116 )
beta : -9.22128 ( -2.64668 3.49508 )
Epeak [keV] : 22.9577 ( -5.61360 2.27825 )
Norm@50keV : 1.40271 ( -1.42323 1.83438 )
------------------------------------------------------------
Chi-Squared = 51.57128 using 59 PHA bins.
Reduced chi-squared = 0.9376596 for 55 degrees of freedom
Null hypothesis probability = 0.606
Photon flux (15-150 keV) in 0.9120 sec: 44.6156 ( -1.7 2.2667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98402e-06 ( -7.55984e-08 8.46865e-08 ) ergs/cm2
Plot creation:
Thu Jan 22 13:11:01 EST 2009