batgrbproduct Analysis for Trigger=350184
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): Thu Apr 23 18:35:32 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger350184/GCN5_download_cron
======================================================================
Trigger: 00350184 Segment: 000
BAT Trigger Time: 262166124.032 [s; MET]
Trigger Stop: 262166125.056 [s; MET]
UTC: 2009-04-23T07:55:19.349660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.894774542363 Dec: 18.160243227552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 148.894774542363 Dec: 18.160243227552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 148.890735230654 Dec: 18.1654590717286 [deg; J2000]
{ 09h 55m 33.8s , +18d 09' 55.7" }
+/- 1.05996679804255 [arcmin] (estimated 90% radius based on SNR)
+/- 0.370748950678646 [arcmin] (formal 1-sigma fit error)
SNR: 27.9889481368008
Angular difference between Flight and Ground position is 0.388546 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 10.2919999957085 +/- 1.07402978674577
Measured from: 0.268000096082687
to: 10.5600000917912 [s; relative to TRIGTIME]
T50: 4.8120000064373 +/- 0.441021538112792
Measured from: 2.96400007605553
to: 7.77600008249283 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.5
to: 4.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.668000012636185
to: 11.7400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.373870 0.509986 0.246174 0.030016
0.019665 0.020164 0.017361 0.014327 [error]
Peak 0.060052 0.078940 0.051268 0.008654
0.006024 0.006366 0.005509 0.004242 [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 1.31e-07 1.89e-07 2.04e-07 4.07e-07 6.50e-07 9.31e-07 erg/cm2
Error 1.06e-08 9.98e-09 1.66e-08 6.74e-08 3.88e-08 8.37e-08 erg/cm2
Peak flux Power-law 6.03e-01 5.56e-01 3.56e-01 3.49e-01 1.66e+00 1.86e+00 ph/cm2/s
Error 8.70e-02 5.19e-02 4.48e-02 8.64e-02 1.53e-01 1.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.15e-07 2.12e-07 2.00e-07 9.37e-08 5.91e-07 6.24e-07 erg/cm2
Error 1.26e-08 1.36e-08 1.98e-08 5.44e-08 4.40e-08 6.95e-08 erg/cm2
Peak flux Cutoff-PL 5.49e-01 5.96e-01 3.70e-01 1.73e-01 1.62e+00 1.69e+00 ph/cm2/s
Error 1.02e-01 6.62e-02 5.02e-02 1.33e-01 1.57e-01 2.03e-01 ph/cm2/s
Fluence Band 1.12e-07 2.13e-07 1.93e-07 2.08e-07 6.04e-07 7.31e-07 erg/cm2
Error 1.32e-08 1.45e-08 2.17e-08 1.57e-07 4.68e-08 1.38e-07 erg/cm2
Peak flux Band 5.49e-01 5.96e-01 3.70e-01 1.73e-01 1.62e+00 1.69e+00 ph/cm2/s
Error 1.02e-01 6.62e-02 5.02e-02 1.33e-01 1.57e-01 2.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.896 0.096 - - 5.70e-03 3.42e-04 59.942 57
CPL 0.802 0.495 48.6 6.2 2.26e-02 1.55e-02 41.427 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.646 0.156 - - 1.27e-02 1.25e-03 55.971 57
CPL 1.017 0.679 74.3 359.7 2.74e-02 2.64e-02 53.029 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: 12.096000 sec.
T50 in the 50-300 keV band: 5.056000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.408 -0.668 11.740
T90 10.292 0.268 10.560
T50 4.812 2.964 7.776
Peak 1.000 3.500 4.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
148.8907 +18.1655 0.0069 25.0 -172.1 1.1075 28.0 TRIG_00350184
------------------------------------------
Foreground time interval of the image:
-0.668 10.369 (delta_t = 11.037 [sec])
Background time interval of the image:
-30.631 -0.668 (delta_t = 29.963 [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 -0.668 sec. to 11.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89621 ( -9.484887E-02 9.711730E-02) )
Norm@50keV : 5.699017E-03 ( -3.443700E-04 3.404482E-04) )
------------------------------------------------------------
Chi-Squared = 59.94235 using 59 PHA bins.
Reduced chi-squared = 1.051620 for 57 degrees of freedom
Null hypothesis probability = 0.369
Photon flux (15-150 keV) in 12.41 sec: 0.816566 ( -0.043879 0.043932 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50192e-07 ( -3.8708e-08 3.89686e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.668 sec. to 11.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.801659 ( -0.524283 0.465748 )
Epeak [keV] : 48.5758 ( -5.12888 7.32448 )
Norm@50keV : 2.259086E-02 ( -9.915573E-03 2.110635E-02) )
------------------------------------------------------------
Chi-Squared = 41.42659 using 59 PHA bins.
Reduced chi-squared = 0.7397605 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 12.41 sec: 0.774065 ( -0.046684 0.046893 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.90993e-07 ( -4.32364e-08 4.47219e-08 ) ergs/cm2
Band function
Time interval is from -0.668 sec. to 11.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.339637 ( -0.618440 1.31636 )
beta : -2.51213 ( -7.48787 0.341501 )
Epeak [keV] : 43.1027 ( -7.86177 11.3872 )
Norm@50keV : 4.461932E-02 ( -3.084109E-02 0.310825 )
------------------------------------------------------------
Chi-Squared = 40.66635 using 59 PHA bins.
Reduced chi-squared = 0.7393881 for 55 degrees of freedom
Null hypothesis probability = 0.925
Photon flux (15-150 keV) in 12.41 sec: 0.776666 ( -0.048483 0.044405 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.03671e-07 ( -5.03288e-08 4.32675e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.500 sec. to 4.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64597 ( -0.154086 0.158144 )
Norm@50keV : 1.272823E-02 ( -1.259693E-03 1.246141E-03) )
------------------------------------------------------------
Chi-Squared = 55.97117 using 59 PHA bins.
Reduced chi-squared = 0.9819503 for 57 degrees of freedom
Null hypothesis probability = 0.514
Photon flux (15-150 keV) in 1.000 sec: 1.65980 ( -0.15269 0.15278 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18394e-07 ( -1.2385e-08 1.2589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.500 sec. to 4.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01685 ( -0.731909 0.626003 )
Epeak [keV] : 74.2663 ( -19.2755 700.159 )
Norm@50keV : 2.741000E-02 ( -1.439081E-02 3.843921E-02) )
------------------------------------------------------------
Chi-Squared = 53.02927 using 59 PHA bins.
Reduced chi-squared = 0.9469512 for 56 degrees of freedom
Null hypothesis probability = 0.588
Photon flux (15-150 keV) in 1.000 sec: 1.62395 ( -0.15705 0.15693 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13096e-07 ( -1.34104e-08 1.3688e-08 ) ergs/cm2
Band function
Time interval is from 3.500 sec. to 4.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01665 ( -0.625963 0.730396 )
beta : -8.57707 ( -1.42293 6.96778 )
Epeak [keV] : 74.2652 ( -19.2875 695.208 )
Norm@50keV : 2.741134E-02 ( -1.439523E-02 3.843317E-02) )
------------------------------------------------------------
Chi-Squared = 53.02928 using 59 PHA bins.
Reduced chi-squared = 0.9641687 for 55 degrees of freedom
Null hypothesis probability = 0.550
Photon flux (15-150 keV) in 1.000 sec: 1.62398 ( -0.15705 0.15691 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13076e-07 ( -1.34856e-08 1.3615e-08 ) ergs/cm2
Plot creation:
Thu Apr 23 18:49:31 EDT 2009