batgrbproduct Analysis for Trigger=302777
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 v2.41
Process Start Time (local time): Fri Feb 8 17:42:31 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger302777/GCN5_download_cron
======================================================================
Trigger: 00302777 Segment: 000
BAT Trigger Time: 224169464 [s; MET]
Trigger Stop: 224169528 [s; MET]
UTC: 2008-02-08T13:17:41.440000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.83904941288 Dec: -19.6921500506871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.8
Flight Position: [ source = BAT ]
RA: 241.83904941288 Dec: -19.6921500506871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.875832651248 Dec: -19.7155320930689 [deg; J2000]
{ 16h 07m 30.2s , -19d 42' 55.9" }
+/- 1.69092522181246 [arcmin] (estimated 90% radius based on SNR)
+/- 0.725274390110227 [arcmin] (formal 1-sigma fit error)
SNR: 14.3623788046618
RA = 16h 7m 30.2s (241.875833 deg.)
Dec = -19d 42' 56" (-19.715532 deg.)
Angular difference between Flight and Ground position is 2.507054 arcmin
Partial Coding Fraction: 0.1503906 [ including projection effects ]
Duration
T90: 90.5360000133514 +/- 34.949197673513
Measured from: 155.016000002623
to: 245.552000015974 [s; relative to TRIGTIME]
T50: 39.6079999804497 +/- 23.4914891989609
Measured from: 168.404000014067
to: 208.011999994516 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 197.863999992609
to: 198.863999992609 [s; relative to TRIGTIME]
Total Fluence
Measured from: 150.576000005007
to: 265.027999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.446305 0.687042 0.248283 -0.099829
0.174079 0.150645 0.139314 0.139066 [error]
Peak 0.096636 0.029756 0.034217 0.022011
0.016175 0.014089 0.013326 0.012960 [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 3.07e-06 3.80e-07 2.03e-08 1.14e-09 3.48e-06 3.47e-06 erg/cm2
Error 3.41e-07 7.78e-08 1.02e-08 1.00e-09 3.49e-07 3.48e-07 erg/cm2
Peak flux Power-law 1.23e+00 3.73e-01 6.18e-02 1.18e-02 1.68e+00 1.68e+00 ph/cm2/s
Error 3.66e-01 1.84e-01 7.41e-02 3.21e-02 4.40e-01 4.43e-01 ph/cm2/s
Fluence Cutoff-PL 3.13e-06 2.74e-07 4.54e-10 1.06e-15 3.40e-06 3.47e-06 erg/cm2
Error 3.67e-07 9.31e-08 3.84e-09 1.48e-11 3.68e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.23e+00 3.73e-01 6.17e-02 1.17e-02 1.68e+00 1.68e+00 ph/cm2/s
Error 3.65e-01 1.84e-01 7.40e-02 3.18e-02 4.40e-01 4.43e-01 ph/cm2/s
Fluence Band 3.13e-06 2.86e-07 6.22e-09 1.39e-10 3.43e-06 3.39e-06 erg/cm2
Error 3.75e-07 8.95e-08 8.55e-09 4.34e-10 3.33e-07 3.29e-07 erg/cm2
Peak flux Band 1.24e+00 3.68e-01 5.97e-02 1.19e-02 1.71e+00 1.49e+00 ph/cm2/s
Error 3.48e-01 1.32e-01 4.51e-02 1.82e-02 4.52e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.136 0.444 - - 2.14e-04 8.33e-05 55.622 57
CPL 1.756 0.000 1.1 0.0 9.52e-01 1.63e+03 50.615 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.591 1.079 - - 3.85e-03 4.00e-03 69.974 57
CPL 1.916 0.448 1.0 0.0 1.02e-01 1.89e-01 71.891 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 114.452 150.576 265.028
T90 90.536 155.016 245.552
T50 39.608 168.404 208.012
Peak 1.000 197.864 198.864
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.8758 -19.7155 0.0133 43.4 -53.8 5.9366 14.4 TRIG_00302777
------------------------------------------
Foreground time interval of the image:
150.576 265.028 (delta_t = 114.452 [sec])
Background time interval of the image:
-119.000 150.576 (delta_t = 269.576 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 150.576 sec. to 265.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.13566 ( -0.348951 0.539047 )
Norm@50keV : 2.144532E-04 ( -8.644995E-05 8.016035E-05) )
------------------------------------------------------------
Chi-Squared = 55.62210 using 59 PHA bins.
Reduced chi-squared = 0.9758264 for 57 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 114.5 sec: 1.02137 ( -0.108862 0.10913 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47512e-06 ( -3.4792e-07 3.49099e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 150.576 sec. to 265.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75613 ( )
Epeak [keV] : 1.13913 ( )
Norm@50keV : 0.951979 ( -10.3569 3242.78 )
------------------------------------------------------------
Chi-Squared = 50.61524 using 59 PHA bins.
Reduced chi-squared = 0.9038436 for 56 degrees of freedom
Null hypothesis probability = 0.678
Photon flux (15-150 keV) in 114.5 sec: 1.02002 ( -0.108651 0.10892 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40407e-06 ( -3.70499e-07 3.66011e-07 ) ergs/cm2
Band function
Time interval is from 150.576 sec. to 265.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.23968 ( -0.760323 1.47138 )
beta : -6.22579 ( -0.440095 0.429877 )
Epeak [keV] : 304.015 ( -303.915 9695.98 )
Norm@50keV : 2.686459E-02 ( -9.307336E-03 1.285360E-02) )
------------------------------------------------------------
Chi-Squared = 55.50472 using 59 PHA bins.
Reduced chi-squared = 1.009177 for 55 degrees of freedom
Null hypothesis probability = 0.456
Photon flux (15-150 keV) in 114.5 sec: 1.01612 ( -0.113273 0.11039 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43452e-06 ( -3.33413e-07 3.32233e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 197.864 sec. to 198.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.59085 ( -0.931321 1.22602 )
Norm@50keV : 3.850246E-03 ( -3.850246E-03 4.149220E-03) )
------------------------------------------------------------
Chi-Squared = 69.97375 using 59 PHA bins.
Reduced chi-squared = 1.227610 for 57 degrees of freedom
Null hypothesis probability = 0.116
Photon flux (15-150 keV) in 1.000 sec: 1.67743 ( -0.44047 0.43962 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41349e-08 ( -2.108e-08 2.45484e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 197.864 sec. to 198.864 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.91601 ( -0.810931 8.507991E-02) )
Epeak [keV] : 0.997666 ( )
Norm@50keV : 0.101680 ( -3.658503E-02 0.342402 )
------------------------------------------------------------
Chi-Squared = 71.89103 using 59 PHA bins.
but latest trial 1.12172 gives Chi-Squared = 26.9664
but latest trial 6.287477E-02 gives Chi-Squared = 4.79665
Reduced chi-squared = 1.283768 for 56 degrees of freedom
Null hypothesis probability = 7.481E-02
Photon flux (15-150 keV) in 1.000 sec: 1.67637 ( -0.44031 0.43943 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40909e-08 ( -2.10557e-08 2.45819e-08 ) ergs/cm2
Band function
Time interval is from 197.864 sec. to 198.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46122 ( -2.56364 12.4364 )
beta : -2.90241 ( -1.22710 0.929830 )
Epeak [keV] : 7.82420 ( -7.72420 9992.18 )
Norm@50keV : 9.699579E-02 ( -0.524307 0.562880 )
------------------------------------------------------------
Chi-Squared = 71.76531 using 59 PHA bins.
Reduced chi-squared = 1.304824 for 55 degrees of freedom
Null hypothesis probability = 6.399E-02
Photon flux (15-150 keV) in 1.000 sec: 1.70530 ( -0.46233 0.44241 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32995e-08 ( -1.93521e-08 1.70555e-08 ) ergs/cm2
Plot creation:
Fri Feb 8 17:51:19 EST 2008