batgrbproduct Analysis for Trigger=179968
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): Mon Dec 31 10:24:38 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger179968/GCN5_download_cron
======================================================================
Trigger: 00179968 Segment: 000
BAT Trigger Time: 160562456 [s; MET]
Trigger Stop: 160562520 [s; MET]
UTC: 2006-02-02T08:40:55.008460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 35.8433696212598 Dec: 38.3619559368161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 35.8433696212598 Dec: 38.3619559368161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 35.8082152642127 Dec: 38.3740397802339 [deg; J2000]
{ 02h 23m 14.0s , +38d 22' 26.5" }
+/- 2.0595410994968 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03862493937832 [arcmin] (formal 1-sigma fit error)
SNR: 10.836146338464
RA = 2h 23m 14.0s (35.808215 deg.)
Dec = 38d 22' 27" (38.374040 deg.)
Angular difference between Flight and Ground position is 1.805698 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 198.944000005722 +/- 23.0742683449237
Measured from: -16.1520000100136
to: 182.791999995708 [s; relative to TRIGTIME]
T50: 121.296000003815 +/- 13.3250178202703
Measured from: 5.96000000834465
to: 127.256000012159 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -6.54399999976158
to: -5.54399999976158 [s; relative to TRIGTIME]
Total Fluence
Measured from: -26.0920000076294
to: 198.219999998808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.368828 1.362927 0.954201 0.223271
0.081931 0.083110 0.072337 0.061832 [error]
Peak 0.024278 0.013034 0.016920 0.010402
0.006282 0.006480 0.005637 0.004760 [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 4.40e-07 6.61e-07 7.43e-07 1.58e-06 2.32e-06 3.43e-06 erg/cm2
Error 5.07e-08 4.54e-08 7.44e-08 3.39e-07 1.72e-07 3.98e-07 erg/cm2
Peak flux Power-law 1.79e-01 1.71e-01 1.13e-01 1.17e-01 5.11e-01 5.81e-01 ph/cm2/s
Error 1.49e-01 6.12e-02 5.21e-02 1.26e-01 1.70e-01 1.87e-01 ph/cm2/s
Fluence Cutoff-PL 4.40e-07 6.62e-07 7.43e-07 1.57e-06 2.32e-06 3.40e-06 erg/cm2
Error 5.07e-08 4.55e-08 7.45e-08 3.36e-07 1.72e-07 3.96e-07 erg/cm2
Peak flux Cutoff-PL 1.79e-01 1.71e-01 1.13e-01 1.16e-01 5.11e-01 5.80e-01 ph/cm2/s
Error 1.49e-01 6.13e-02 5.21e-02 1.26e-01 1.70e-01 1.86e-01 ph/cm2/s
Fluence Band 4.30e-07 6.58e-07 7.47e-07 1.61e-06 2.33e-06 3.48e-06 erg/cm2
Error 4.45e-08 5.24e-08 1.23e-07 4.76e-07 2.61e-07 0.00e+00 erg/cm2
Peak flux Band 1.80e-01 1.71e-01 1.13e-01 1.17e-01 5.12e-01 5.81e-01 ph/cm2/s
Error 5.70e-02 5.43e-02 3.28e-02 3.70e-02 1.05e+01 1.84e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.832 0.130 - - 1.13e-03 8.23e-05 62.417 57
CPL 1.750 0.275 152.2 0.0 1.24e-03 3.65e-04 62.705 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.591 0.743 - - 3.99e-03 1.39e-03 53.960 57
CPL 1.645 0.751 9995.7 0.0 3.95e-03 1.40e-03 53.982 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: 208.448000 sec.
T50 in the 50-300 keV band: 105.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 224.312 -26.092 198.220
T90 198.944 -16.152 182.792
T50 121.296 5.960 127.256
Peak 1.000 -6.544 -5.544
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
35.8082 +38.3740 0.0177 38.1 -156.0 1.4022 10.8 TRIG_00179968
------------------------------------------
Foreground time interval of the image:
-26.092 70.501 (delta_t = 96.593 [sec])
Background time interval of the image:
-299.000 -26.092 (delta_t = 272.908 [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
Multiple GTIs in the spectrum
tstart tstop
-26.092000 116.157100
117.000000 198.220000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83206 ( -0.128784 0.131059 )
Norm@50keV : 1.128883E-03 ( -8.275779E-05 8.188363E-05) )
------------------------------------------------------------
Chi-Squared = 62.41728 using 59 PHA bins.
Reduced chi-squared = 1.095040 for 57 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 223.5 sec: 0.157532 ( -0.011139 0.011184 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3206e-06 ( -1.71165e-07 1.72319e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-26.092000 116.157100
117.000000 198.220000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75030 ( -0.331110 0.219477 )
Epeak [keV] : 152.214 ( )
Norm@50keV : 1.241991E-03 ( -9.241025E-05 6.376106E-04) )
------------------------------------------------------------
Chi-Squared = 62.70502 using 59 PHA bins.
Reduced chi-squared = 1.119732 for 56 degrees of freedom
Null hypothesis probability = 0.251
Photon flux (15-150 keV) in 223.5 sec: 0.157466 ( -0.011135 0.011179 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32085e-06 ( -1.71284e-07 1.72296e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-26.092000 116.157100
117.000000 198.220000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36828 ( -10.3183 2.59689 )
beta : -1.84620 ( -0.160752 0.153673 )
Epeak [keV] : 33.7315 ( -27.1833 9972.72 )
Norm@50keV : 2.513580E-03 ( -1.361477E-02 268.089 )
------------------------------------------------------------
Chi-Squared = 62.20572 using 59 PHA bins.
Reduced chi-squared = 1.131013 for 55 degrees of freedom
Null hypothesis probability = 0.235
Photon flux (15-150 keV) in 223.5 sec: 0.157286 ( -0.010883 0.010533 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32514e-06 ( -7.95307e-07 1.55712e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -6.544 sec. to -5.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59093 ( -0.731543 0.755444 )
Norm@50keV : 3.989325E-03 ( -1.468297E-03 1.317742E-03) )
------------------------------------------------------------
Chi-Squared = 53.95957 using 59 PHA bins.
Reduced chi-squared = 0.9466591 for 57 degrees of freedom
Null hypothesis probability = 0.590
Photon flux (15-150 keV) in 1.000 sec: 0.511377 ( -0.170293 0.168995 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73492e-08 ( -1.38738e-08 1.39618e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.544 sec. to -5.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64476 ( -0.793805 0.708188 )
Epeak [keV] : 9995.66 ( )
Norm@50keV : 3.950779E-03 ( -1.477711E-03 1.331378E-03) )
------------------------------------------------------------
Chi-Squared = 53.98211 using 59 PHA bins.
Reduced chi-squared = 0.9639662 for 56 degrees of freedom
Null hypothesis probability = 0.552
Photon flux (15-150 keV) in 1.000 sec: 0.511137 ( -0.170263 0.168948 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73392e-08 ( -1.38757e-08 1.39707e-08 ) ergs/cm2
Band function
Time interval is from -6.544 sec. to -5.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22697 ( -8.77304 6.22696 )
beta : -1.59046 ( -8.40954 0.731942 )
Epeak [keV] : 30.4996 ( -30.3996 9969.50 )
Norm@50keV : 9.047854E-03 ( -9.047854E-03 2.07897 )
------------------------------------------------------------
Chi-Squared = 53.95962 using 59 PHA bins.
Reduced chi-squared = 0.9810840 for 55 degrees of freedom
Null hypothesis probability = 0.514
Photon flux (15-150 keV) in 1.000 sec: 0.511563 ( -0.162329 20.9131 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77057e-08 ( -1.196e-08 1.32847e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 10:37:34 EST 2007