GRB180611A

This page lists all entries on GRB180611A in GRBweb

Summary Fermi GBM IPN GCN 22767 GCN 22768 GCN 22770 GCN 22795

Summary table
Variable Value Source
GRB_name_Fermi GRB180611145
T0 3:29:01 UTC GCN_circulars,IPN Triangulation
ra 46.4708° IPN
decl -48.8333° IPN
pos_error 1.12e+01° IPN
T90 8.96 s Fermi_GBM
T90_error 0.572 s Fermi_GBM
T90_start 3:29:01.205 UTC Fermi_GBM
fluence 4.70e-06 erg/cm² Fermi_GBM
fluence_error 3.21e-08 erg/cm² Fermi_GBM
T100 9.165 s
GBM_located False
mjd 58280.145150462966 GCN_circulars,IPN Triangulation
Fermi GBM table
GRB_name_Fermi GRB180611145
trigger_name bn180611145
ra 51.6100°
decl -47.8600°
pos_error 3.08e+00°
datum 2018-06-11
t_trigger 3:29:01.461 UTC
T90 8.96 s
T90_error 0.572 s
T90_start 3:29:01.205 UTC
fluence 4.70e-06 erg/cm²
fluence_error 3.21e-08 erg/cm²
flux_1024 8.41e+00 erg/cm²/s
flux_1024_error 2.56e-01 erg/cm²/s
flux_1024_time 6.40e-02 erg/cm²/s
flux_64 1.07e+01 erg/cm²/s
flux_64_error 1.08e+00 erg/cm²/s
IPN table
GRB_name GRB180611A
ra 46.4708°
decl -48.8333°
pos_error 1.12e+01°
GCN 22767 table
GRB_name GRB180611A
GCN_number 22767
Detection_method IPN Triangulation
t_trigger 3:29:01 UTC
ra 46.4710°
decl -48.8350°
Circular_text TITLE: GCN CIRCULAR NUMBER: 22767 SUBJECT: IPN Triangulation of GRB 180611A (long) DATE: 18/06/12 11:23:55 GMT FROM: Anna Kozlova at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge, on behalf of the Fermi GBM team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The long-duration GRB 180611A was detected by Fermi (GBM; trigger 550380546), INTEGRAL (SPI-ACS), Konus-Wind, and Mars-Odyssey (HEND), at about 12541 s UT (03:29:01). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 46.471 (03h 05m 53s) -48.835 (-48d 50' 05") Corners: 47.883 (03h 11m 32s) -52.743 (-52d 44' 36") 50.103 (03h 20m 25s) -53.759 (-53d 45' 33") 45.101 (03h 00m 24s) -44.765 (-44d 45' 54") 43.190 (02h 52m 46s) -43.503 (-43d 30' 10") --------------------------------------------- The error box area is 8.7 sq. deg, and its maximum dimension is 11.2 deg (the minimum one is 53.9 arcmin). The Sun distance was 75 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB180611_T12541/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.
GCN 22768 table
GRB_name GRB180611A
GCN_number 22768
Detection_method Fermi GBM Det
t_trigger 3:29:01.460 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 22768 SUBJECT: GRB 180611A: Fermi GBM observation DATE: 18/06/12 19:40:00 GMT FROM: Elisabetta Bissaldi at INFN,Bari E. Bissaldi (Politecnico & INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 03:29:01.46 UT on 11 June 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180611A (trigger 550380546 / 180611145), which was also reported by Hurley et al. 2018 (GCN 22767). The GBM location is consistent with the IPN triangulated box. The angle from the Fermi LAT boresight at the GBM trigger time is 62 degrees. The GBM light curve shows a multipeaked emission episode with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-1 s to T0+10 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.95 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 253 +/- 22 keV. The event fluence (10-1000 keV) in this time interval is (5.4 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0 in the 10-1000 keV band is 8.4 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak = 219 +/- 30 keV, alpha = -0.9 +/- 0.1 and beta = -2.4 +/- 0.3. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 22770 table
GRB_name GRB180611A
GCN_number 22770
Detection_method Konus-Wind Det
t_trigger 3:29:01.046 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 22770 SUBJECT: Konus-Wind observation of GRB 180611A DATE: 18/06/13 16:09:51 GMT FROM: Anastasia Tsvetkova at Ioffe Institute A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 180611A (IPN Triangulation: Hurley et al., GCN 22767; Fermi GBM observation: Bissaldi & Meegan, GCN 22768) triggered Konus-Wind at T0=12541.046 s UT (03:29:01.046). The burst light curve shows several peaks with a total duration of ~7 s. The emission is seen up to ~1.5 MeV. As observed by Konus-Wind, the burst had a fluence of 4.61(-0.56,+0.72)x10^-6 erg/cm2, and a 64-ms peak energy flux, measured from T0+0.148 s, of 5.04(-2.18,+3.14)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1.5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.80(-0.26,+0.30), and Ep = 250(-47,+77) keV (chi2 = 52/60 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.25 (chi2 = 52/59 dof). The spectrum near the peak count rate (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 20 MeV range by the power law with exponential cutoff model with alpha = -1.05(-0.29,+0.38), and Ep = 668(-304,+856) keV (chi2 = 23/19 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -1.80 (chi2 = 23/18 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180611_T12541/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 22795 table
GRB_name GRB180611A
GCN_number 22795
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 22795 SUBJECT: GRB 180611A: AstroSat CZTI detection DATE: 18/06/18 16:37:30 GMT FROM: Vidushi Sharma at IUCAA V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration: Analysis of Astrosat CZTI data showed the detection of a long GRB 180611A, which was also detected by IPN Triangulation (Hurley K. et al., GCN 22767), Fermi-GBM (Bissaldi E. et al., GCN 22768), Konus-Wind (Tsvetkova A. et al., GCN 22770). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 03:29:02.5 UT. The measured peak count rate is 265.9 cts/s above the background in combined data of four quadrants, with a total of 1173 cts. The local mean background count rate was 478.1 cts/s. Using cumulative rates, we measure a T90 of 11.5 s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.