Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Mon Oct 24 00:18:18 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1085430
======================================================================
Trigger: 01085430 Segment: 000
BAT Trigger Time: 659872294.4 [s; MET]
Trigger Stop: 659872295.424 [s; MET]
UTC: 2021-11-29T09:51:06.232980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.556946141108 Dec: 31.7759512305881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.2
Image Trigger?: NO
Rate S/N Ratio: 21.1660104885167 [ if not an image trigger ]
Image S/N Ratio: 9.2
Analysis Position: [ source = BAT ]
RA: 274.556946141108 Dec: 31.7759512305881 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 274.565882683047 Dec: 31.780805473117 [deg; J2000]
{ 18h 18m 15.8s , +31d 46' 50.9" }
+/- 1.44953738100853 [arcmin] (estimated 90% radius based on SNR)
+/- 0.543685109332379 [arcmin] (formal 1-sigma fit error)
SNR: 17.8974285708247
Angular difference between the analysis and refined position is 0.540920 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 643.68799996376 +/- 204.267742900217
Measured from: 0.608000040054321
to: 644.296000003815 [s; relative to TRIGTIME]
T50: 170.699999928474 +/- 131.55763648748
Measured from: 26.5320000648499
to: 197.231999993324 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.98800003528595
to: 1.98800003528595 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.80400002002716
to: 848.544000029564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.493071 1.726285 0.838827 0.241441
0.214571 0.221767 0.196865 0.184823 [error]
Peak 0.057072 0.074236 0.054724 0.023507
0.009040 0.009837 0.008514 0.007331 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 850.348 -1.804 848.544
T90 643.688 0.608 644.296
T50 170.700 26.532 197.232
Peak 1.000 0.988 1.988
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.775 -0.287 0.272 - - - 3.02e-04 -5.52e-05 5.33e-05 58.520 57
CPL -1.779 -0.712 0.921 9996.160 -9996.150 -9996.160 3.00e-04 -3.00e-04 7.41e-04 58.520 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.533 -0.244 0.240 - - - 1.22e-02 -1.91e-03 1.89e-03 89.180 57
CPL -0.451 -1.117 1.488 63.657 -16.969 -63.657 4.88e-02 -4.88e-02 2.73e-01 86.510 56
=== 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 PL 4.24e-07 6.59e-07 7.71e-07 1.74e-06 2.36e-06 3.59e-06 erg/cm2
90%_error_low -8.97e-08 -9.69e-08 -1.89e-07 -7.28e-07 -4.34e-07 -9.49e-07 erg/cm2
90%_error_hi 9.20e-08 9.68e-08 1.94e-07 1.03e-06 4.49e-07 1.20e-06 erg/cm2
Peak flux PL 5.20e-01 5.14e-01 3.55e-01 3.87e-01 1.54e+00 1.78e+00 ph/cm2/s
90%_error_low -1.17e-01 -7.80e-02 -6.90e-02 -1.30e-01 -2.28e-01 -2.67e-01 ph/cm2/s
90%_error_hi 1.23e-01 7.76e-02 6.89e-02 1.65e-01 2.28e-01 2.70e-01 ph/cm2/s
Fluence CPL 4.24e-07 6.59e-07 7.71e-07 1.73e-06 2.36e-06 3.63e-06 erg/cm2
90%_error_low N/A N/A -1.89e-07 N/A -3.46e-07 -1.52e-06 erg/cm2
90%_error_hi N/A N/A 1.94e-07 N/A 4.49e-07 1.17e-06 erg/cm2
Peak flux CPL 4.60e-01 5.83e-01 3.63e-01 1.12e-01 1.49e+00 1.52e+00 ph/cm2/s
90%_error_low -1.38e-01 -1.06e-01 -8.53e-02 -1.12e-01 -2.35e-01 -2.54e-01 ph/cm2/s
90%_error_hi 1.40e-01 1.12e-01 8.08e-02 2.97e-01 2.35e-01 3.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 274.5659 31.7808 0.0107 21.6619 -39.3332 1.2496804 17.897 TRIG_01085430 Foreground time interval of the image: -1.804 14.301 (delta_t = 16.105 [sec]) Background time interval of the image: -138.899 -1.804 (delta_t = 137.095 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM
Power-law model
Time interval is from -1.804 sec. to 848.544 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77485 ( -0.286875 0.272151 ) Norm@50keV : 3.01610E-04 ( -5.51669e-05 5.32909e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.52 using 59 bins. Reduced chi-squared = 1.02667 # Null hypothesis probability of 4.20e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 850.3 sec: 4.11650E-02 ( -0.0060319 0.0060318 ) ph/cm2/s Energy fluence (15-150 keV) : 2.36376e-06 ( -4.34136e-07 4.49064e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.804 sec. to 848.544 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77877 ( -0.71319 0.919922 ) Epeak [keV] : 9996.16 ( -9999.23 -9999.24 ) Norm@50keV : 2.99797E-04 ( -0.000301624 0.000739153 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.52 using 59 bins. Reduced chi-squared = 1.045 # Null hypothesis probability of 3.83e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 850.3 sec: 3.69056E-02 ( -0.0100465 0.0086929 ) ph/cm2/s Energy fluence (15-150 keV) : 2.36332e-06 ( -3.46007e-07 4.48988e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.988 sec. to 1.988 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53287 ( -0.24406 0.240277 ) Norm@50keV : 1.22489E-02 ( -0.00190974 0.00188839 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 89.18 using 59 bins. Reduced chi-squared = 1.56456 # Null hypothesis probability of 4.12e-03 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.54311 ( -0.22766 0.22781 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15617e-07 ( -1.94425e-08 1.97959e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.988 sec. to 1.988 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.450858 ( -1.12 1.485 ) Epeak [keV] : 63.6572 ( -16.8746 -63.5633 ) Norm@50keV : 4.87912E-02 ( -0.0490723 0.272947 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 86.51 using 59 bins. Reduced chi-squared = 1.54482 # Null hypothesis probability of 5.52e-03 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.48928 ( -0.23532 0.23537 ) ph/cm2/s Energy fluence (15-150 keV) : 1.03727e-07 ( -2.13435e-08 2.31988e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 3.072063213645213E-01, IMY = 2.517427789715487E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -138.899400 -1.804000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3908 35.3566 111.5 38.7 -34.9 -0.0354 -0.1 3.4 Her X-1 268.3190 -1.6277 0.0 40.6 -98.3 -2.4650 -2.6 10.9 SW J1753.5-0127 288.6311 10.9207 8.6 18.2 -116.0 -0.2974 -1.3 10.0 GRS 1915+105 299.6000 35.2156 0.5 8.8 35.8 4.8820 24.3 1.0 Cyg X-1 307.8449 41.0216 0.0 16.4 56.0 0.4799 2.0 12.7 Cyg X-3 325.9394 38.4114 0.0 25.8 86.4 0.7595 2.6 12.2 Cyg X-2 333.8360 68.7835 3.2 47.1 47.3 3.4401 3.6 ------ UNKNOWN 340.8599 -8.2613 2.7 53.7 155.2 5.0604 4.3 ------ UNKNOWN 310.6797 68.0138 2.5 42.2 37.4 2.1299 4.6 ------ UNKNOWN 297.2286 66.2692 3.0 39.8 29.9 1.3977 3.8 ------ UNKNOWN 240.8950 68.3309 2.2 53.8 8.0 4.6756 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.804000 14.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6292 35.3098 4.7 38.5 -34.9 -0.2558 -2.5 8.6 Her X-1 268.2370 -1.5286 5.9 40.6 -98.1 -0.5605 -1.9 9.1 SW J1753.5-0127 288.9860 10.9418 4.0 18.0 -117.0 0.1994 2.9 11.1 GRS 1915+105 299.4918 35.0455 3.9 8.6 35.3 0.1864 3.0 10.5 Cyg X-1 308.3752 40.8832 0.0 16.5 57.5 0.0103 0.1 12.7 Cyg X-3 326.1726 38.1819 4.6 25.9 87.0 -0.2467 -2.5 8.4 Cyg X-2 274.5659 31.7808 0.6 21.7 -39.3 1.2494 17.9 ------ UNKNOWN 254.8956 27.3415 1.7 38.8 -47.7 0.8172 6.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.300600 830.200600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3123 35.4261 23.7 17.2 -13.4 -0.4180 -0.5 8.7 Her X-1 268.3800 -1.2942 16.6 33.6 -109.9 1.3634 0.7 9.5 SW J1753.5-0127 288.8353 10.7530 0.0 24.8 -156.4 -0.6929 -0.7 11.8 GRS 1915+105 299.6102 35.2040 0.4 21.1 132.7 26.6454 29.9 1.0 Cyg X-1 307.9239 40.8992 15.5 28.2 120.6 0.8306 0.7 9.0 Cyg X-3 326.1852 38.2376 6.5 42.2 125.3 5.1019 1.8 5.1 Cyg X-2 244.2022 59.6415 3.3 34.4 32.0 4.4453 3.5 ------ UNKNOWN 201.5822 52.4537 2.8 55.3 13.7 22.0409 4.1 ------ UNKNOWN 303.5739 16.7315 3.1 30.3 171.8 3.6649 3.7 ------ UNKNOWN 297.0950 11.5673 3.1 29.0 -172.0 3.2437 3.7 ------ UNKNOWN 235.9005 29.3703 2.0 33.2 -25.0 5.6395 5.7 ------ UNKNOWN 289.0285 0.4311 2.6 34.2 -147.5 4.5006 4.4 ------ UNKNOWN 241.9174 12.1119 2.4 35.9 -57.0 6.4055 4.8 ------ UNKNOWN 280.7647 -15.7984 3.6 48.0 -129.2 13.9108 3.2 ------ UNKNOWN 234.0044 5.8256 2.8 45.9 -56.9 17.8327 4.2 ------ UNKNOWN