GRB200817A

This page lists all entries on GRB200817A in GRBweb

Summary Fermi GBM GCN 28254 GCN 28256 GCN 28305

Summary table
Variable Value Source
GRB_name_Fermi GRB200817393
T0 9:24:57.952 UTC Fermi_GBM
ra 250.3368° GCN_circulars,Optical
decl 51.7850°
T90 30.464 s Fermi_GBM
T90_error 2.919 s Fermi_GBM
T90_start 9:24:57.952 UTC Fermi_GBM
fluence 1.86e-06 erg/cm² Fermi_GBM
fluence_error 4.40e-08 erg/cm² Fermi_GBM
redshift 0.7300 GCN_circulars,Optical
T100 30.464 s
GBM_located False
mjd 59078.39233740741 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB200817393
trigger_name bn200817393
ra 194.4800°
decl 51.7700°
pos_error 8.50e+00°
datum 2020-08-17
t_trigger 9:25:20.224 UTC
T90 30.464 s
T90_error 2.919 s
T90_start 9:24:57.952 UTC
fluence 1.86e-06 erg/cm²
fluence_error 4.40e-08 erg/cm²
flux_1024 2.49e+00 erg/cm²/s
flux_1024_error 2.92e-01 erg/cm²/s
flux_1024_time -1.02e+00 erg/cm²/s
flux_64 5.07e+00 erg/cm²/s
flux_64_error 1.51e+00 erg/cm²/s
GCN 28254 table
GRB_name GRB200817A
GCN_number 28254
Detection_method Fermi GBM final loc
t_trigger 9:25:20 UTC
ra 194.5000°
decl 51.8000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 28254 SUBJECT: GRB 200817A: Fermi GBM Final Real-time Localization DATE: 20/08/17 09:36:37 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 09:25:20 UT on 17 Aug 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200817A (trigger 619349125.224034 / 200817393). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 194.5, Dec = 51.8 (J2000 degrees, equivalent to J2000 12h 58m, 51d 47'), with a statistical uncertainty of 16.5 degrees. The angle from the Fermi LAT boresight is 110.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200817393/quicklook/glg_skymap_all_bn200817393.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200817393/quicklook/glg_healpix_all_bn200817393.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200817393/quicklook/glg_lc_medres34_bn200817393.gif
GCN 28256 table
GRB_name GRB200817A
GCN_number 28256
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 28256 SUBJECT: Fermi GRB 200817A: Global MASTER-Net observations report DATE: 20/08/17 14:00:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 200817A ( Fermi GBM team, GCN 28254) errorbox 14716 sec after notice time and 14749 sec after trigger time at 2020-08-17 13:31:09 UT, with upper limit up to 18.3 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -10.0 deg. The galactic latitude b = 66 deg., longitude l = 120 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1421422 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 14780 | 2020-08-17 13:31:09 | MASTER-Tunka | (12h 57m 56.42s , +58d 23m 36.8s) | C | 60 | 16.9 | 14859 | 2020-08-17 13:32:29 | MASTER-Tunka | (13h 14m 28.63s , +56d 23m 12.7s) | C | 60 | 17.1 | 14939 | 2020-08-17 13:33:49 | MASTER-Tunka | (12h 45m 43.50s , +56d 22m 38.3s) | C | 60 | 17.2 | 15018 | 2020-08-17 13:35:08 | MASTER-Tunka | (13h 02m 54.40s , +54d 23m 36.1s) | C | 60 | 17.4 | 15098 | 2020-08-17 13:36:27 | MASTER-Tunka | (12h 57m 48.21s , +58d 24m 27.1s) | C | 60 | 17.3 | 15177 | 2020-08-17 13:37:47 | MASTER-Tunka | (13h 13m 04.06s , +58d 23m 38.4s) | C | 60 | 17.5 | 15257 | 2020-08-17 13:39:07 | MASTER-Tunka | (13h 14m 22.85s , +56d 22m 39.2s) | C | 60 | 17.7 | 15337 | 2020-08-17 13:40:26 | MASTER-Tunka | (13h 28m 48.70s , +56d 22m 54.9s) | C | 60 | 17.7 | 15416 | 2020-08-17 13:41:46 | MASTER-Tunka | (12h 45m 42.90s , +56d 23m 42.2s) | C | 60 | 17.7 | 15496 | 2020-08-17 13:43:06 | MASTER-Tunka | (13h 00m 03.48s , +56d 22m 46.0s) | C | 60 | 17.8 | 15577 | 2020-08-17 13:44:27 | MASTER-Tunka | (13h 03m 00.68s , +54d 24m 04.9s) | C | 60 | 18.0 | 15657 | 2020-08-17 13:45:47 | MASTER-Tunka | (13h 16m 32.39s , +54d 23m 33.9s) | C | 60 | 18.2 | 15737 | 2020-08-17 13:47:06 | MASTER-Tunka | (13h 12m 57.57s , +58d 24m 26.9s) | C | 60 | 18.1 | 15816 | 2020-08-17 13:48:26 | MASTER-Tunka | (13h 28m 47.54s , +56d 23m 39.4s) | C | 60 | 18.1 | 15895 | 2020-08-17 13:49:45 | MASTER-Tunka | (12h 59m 59.01s , +56d 22m 13.0s) | C | 60 | 18.2 | 15975 | 2020-08-17 13:51:05 | MASTER-Tunka | (13h 16m 37.84s , +54d 22m 52.0s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 28305 table
GRB_name GRB200817A
GCN_number 28305
Detection_method Optical
ra 250.3368°
redshift 0.7300
Circular_text TITLE: GCN CIRCULAR NUMBER: 28305 SUBJECT: Zwicky Transient Facility discovery of ZTF20abtxwfx/AT2020sev, a fast optical transient and candidate afterglow DATE: 20/08/29 02:48:17 GMT FROM: Igor Andreoni at Caltech Igor Andreoni (Caltech), Anna Ho (UCB), Michael Coughlin (UMN), Mansi Kasliwal (Caltech), Eric Burns (LSU), Dmitry Svinkin (Ioffe Institute), Tomas Ahumada (UM), Yuhan Yao (Caltech), Daniel Perley (LJMU), Shreya Anand (Caltech), Erik Kool (OKC), Ana Sagues Carracedo (OKC) on behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations We report the discovery of the fast optical transient ZTF20abtxwfx/AT2020sev with the Zwicky Transient Facility (ZTF, Bellm et al. 2019, Graham et al. 2019) at coordinates: RAJ2000 = 16:41:21.21 (250.338384d) DecJ2000 = +57:08:20.5 (+57.139027d) ZTF20abtxwfx was found during the science validation of the new "ZTF Realtime Search and Triggering" (ZTF-ReST) project. ZTF-ReST will aim at near real-time identification of kilonova candidates in ZTF data using the methods described in Andreoni et al. (2020d), independently of gravitational-wave or gamma-ray triggers. ZTF20abtxwfx was first detected on 2020-08-18 05:20 UT, heareafter labelled T_det. ZTF20abtxwfx faded by ~1.3 mag in r-band in the first 2 days since T_det. The transient was last detected on 2020-08-23 04:51 UT at r = 20.98 +- 0.24 mag. Stringent upper limits constrain the transient onset time to be within ~1 day from T_det. The color of the transient appears to be red, with g-r~0.1 and g-i~0.3 one day after T_det. The Galactic extinction on the line of sight is low, with E(B-V)=0.015 mag (Planck Collaboration et al., 2015). In the table below, we report forced photometry obtained with ForcePhotZTF (Yao et al., 2019) on images processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al. 2019). -----------------+--------+------+------ Date (UT) | mag | emag | band -----------------+--------+------+------ 2020-08-17 06:45 | > 21.0 | | r 2020-08-18 05:20 | 19.22 | 0.04 | r 2020-08-19 04:19 | 20.03 | 0.11 | r 2020-08-19 05:23 | 20.16 | 0.09 | g 2020-08-19 05:53 | 19.83 | 0.14 | i 2020-08-20 04:47 | 20.54 | 0.15 | r 2020-08-20 05:46 | 20.66 | 0.16 | g 2020-08-21 04:25 | 20.71 | 0.17 | r 2020-08-21 06:54 | > 20.8 | | g 2020-08-23 04:12 | > 21.0 | | g 2020-08-23 04:51 | 20.98 | 0.24 | r 2020-08-24 04:26 | > 20.5 | | r -----------------+--------+------+------ ZTF20abtxwfx is located at high Galactic latitude b_Gal = 40.0 deg. Deep Legacy Survey, Pan-STARRS1, and CFHT images of the field do not reveal any permanent source at the transient location. The spatially closest source reported in the Legacy Survey DR8 catalog (RA, Dec = 250.3368d, 57.1377d) has a separation of 5.7 arcsec from ZTF20abtxwfx, is extended (not point-like), has photometric redshift of z = 0.73 +- 0.2, and has reported magnitudes of g=23.37 mag, r=22.63 mag, and z=21.86 mag. We searched the GCN archives, the Fermi GBM catalog, the Fermi GBM subthreshold catalog, and the Konus-Wind triggered and waiting mode data for any possible gamma-ray burst (GRB) counterpart. We found one possible counterpart, GRB 200817A (Fermi GBM Team, GCN #28254). The trigger time of GRB 200817A was on 2020-08-17 09:25:20 UT, which lies in the time interval between our last optical non-detection and T_det. ZTF20abtxwfx is located in the 93rd percentile of the localization region, at an angular distance of about 32 degrees from the central GRB position. We confirm that the position of ZTF20abtxwfx was within the GBM field-of-view at the time of the GRB. Multi-wavelength follow-up of ZTF20abtxwfx is encouraged. ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done with Kowalski (Duev et al. 2019).