batgrbproduct Analysis for Trigger=377179
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): Sat Nov 28 13:13:55 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger377179/GCN5_download_cron
======================================================================
Trigger: 00377179 Segment: 000
BAT Trigger Time: 281057151.104 [s; MET]
Trigger Stop: 281057152.128 [s; MET]
UTC: 2009-11-27T23:25:45.805160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 36.5708005072054 Dec: -18.9537141498341 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.95
Image Trigger?: NO
Rate S/N Ratio: 108.300507847378 [ if not an image trigger ]
Image S/N Ratio: 17.95
Flight Position: [ source = BAT ]
RA: 36.5708005072054 Dec: -18.9537141498341 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 36.5809730322163 Dec: -18.9477344010206 [deg; J2000]
{ 02h 26m 19.4s , -18d 56' 51.8" }
+/- 1.2233613798206 [arcmin] (estimated 90% radius based on SNR)
+/- 0.501313598091856 [arcmin] (formal 1-sigma fit error)
SNR: 22.8055285770903
Angular difference between Flight and Ground position is 0.679681 arcmin
Partial Coding Fraction: 0.04443359 [ including projection effects ]
Duration
T90: 6.9559999704361 +/- 0.150359555029189
Measured from: -0.11599987745285
to: 6.84000009298325 [s; relative to TRIGTIME]
T50: 3.84799993038177 +/- 0.458955363798067
Measured from: 0.340000152587891
to: 4.18800008296967 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.251999974250793
to: 0.748000025749207 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.371999979019165
to: 7.19600003957748 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.485796 5.068514 3.272976 0.727706
0.150013 0.159409 0.132560 0.092676 [error]
Peak 1.278436 1.732896 1.297031 0.308756
0.073483 0.085356 0.076532 0.046505 [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 1.94e-06 2.60e-06 2.56e-06 4.52e-06 8.58e-06 1.16e-05 erg/cm2
Error 1.30e-07 1.30e-07 1.37e-07 5.15e-07 3.34e-07 6.26e-07 erg/cm2
Peak flux Power-law 1.84e+01 1.52e+01 8.57e+00 7.12e+00 4.53e+01 4.93e+01 ph/cm2/s
Error 1.70e+00 8.95e-01 6.21e-01 1.02e+00 2.69e+00 2.76e+00 ph/cm2/s
Fluence Cutoff-PL 1.95e-06 2.66e-06 2.57e-06 3.72e-06 1.09e-05 0.00e+00 erg/cm2
Error 1.65e-07 1.13e-07 1.40e-07 1.18e-06 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.67e+01 1.59e+01 9.05e+00 4.50e+00 4.43e+01 4.61e+01 ph/cm2/s
Error 2.10e+00 1.05e+00 7.41e-01 1.46e+00 2.78e+00 3.30e+00 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 2.023 0.072 - - 1.23e-01 4.93e-03 56.030 57
CPL 1.797 0.280 46.3 0.0 1.58e-01 0.00e+00 54.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.830 0.094 - - 3.25e-01 1.89e-02 59.230 57
CPL 1.329 0.399 69.5 34.2 5.75e-01 2.69e-01 54.120 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: 8.000000 sec.
T50 in the 50-300 keV band: 3.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.568 -0.372 7.196
T90 6.956 -0.116 6.840
T50 3.848 0.340 4.188
Peak 1.000 -0.252 0.748
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
36.5810 -18.9477 0.0084 52.4 21.9 14.1875 22.8 TRIG_00377179
------------------------------------------
Foreground time interval of the image:
-0.372 7.196 (delta_t = 7.568 [sec])
Background time interval of the image:
-107.703 -0.372 (delta_t = 107.331 [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 -0.372 sec. to 7.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02322 ( -0.0713204 0.072351 )
Norm@50keV : 0.122746 ( -0.00494043 0.00492121 )
------------------------------------------------------------
# Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 57 degrees of freedom
# Null hypothesis probability = 5.114793e-01
Photon flux (15-150 keV) in 7.568 sec: 18.6112 ( -0.804176 0.808372 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57803e-06 ( -3.3401e-07 3.34287e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79747 ( -0.287982 0.271586 )
Epeak [keV] : 46.3374 ( )
Norm@50keV : 0.158189 ( )
------------------------------------------------------------
# Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9649 for 56 degrees of freedom
# Null hypothesis probability = 5.496954e-01
Photon flux (15-150 keV) in 7.568 sec: 18.7078 ( -0.8852 0.8876 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.372 sec. to 7.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.79731 ( 1.88633 0.293799 )
beta : -10.00000 ( 4.62972e+13 4.62972e+13 )
Epeak [keV] : 46.3538 ( -43.2254 -46.3538 )
Norm@50keV : 0.158164 ( -0.0360439 0.0587941 )
------------------------------------------------------------
# Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9824 for 55 degrees of freedom
# Null hypothesis probability = 5.115990e-01
Photon flux (15-150 keV) in 7.568 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 -0.252 sec. to 0.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82998 ( -0.0935048 0.0953545 )
Norm@50keV : 0.325138 ( -0.0189573 0.0188731 )
------------------------------------------------------------
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.942912e-01
Photon flux (15-150 keV) in 1 sec: 45.3346 ( -2.68731 2.69379 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99065e-06 ( -1.7572e-07 1.76015e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 0.748 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32918 ( -0.414785 0.382346 )
Epeak [keV] : 69.5408 ( -12.8525 55.6004 )
Norm@50keV : 0.575252 ( -0.199168 0.338193 )
------------------------------------------------------------
# Chi-Squared = 54.12 using 59 PHA bins.
# Reduced chi-squared = 0.9665 for 56 degrees of freedom
# Null hypothesis probability = 5.462852e-01
Photon flux (15-150 keV) in 1 sec: 44.3236 ( -2.7798 2.79 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93807e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.252 sec. to 0.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31422 ( -0.352957 0.870275 )
beta : -2.38603 ( 2.40166 0.513926 )
Epeak [keV] : 68.1461 ( -26.9315 53.9396 )
Norm@50keV : 0.587389 ( -0.216288 1.51395 )
------------------------------------------------------------
# Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9823 for 55 degrees of freedom
# Null hypothesis probability = 5.118100e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Nov 28 13:42:13 EST 2009