GRB 190508A

The Fermi GBM team reports the detection of a likely LONG GRB

At 19:22:50 UT on 8 May 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190508A (trigger 579036175.400484 / 190508808).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 178.0, Dec = 23.5 (J2000 degrees, equivalent to J2000 11h 51m, 23d 31'), with a statistical uncertainty of 2.1 degrees.

The angle from the Fermi LAT boresight is 98.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190508808/quicklook/glg_skymap_all_bn190508808.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190508808/quicklook/glg_healpix_all_bn190508808.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190508808/quicklook/glg_lc_medres34_bn190508808.gif

K.Ulaczyk(1), J.Lyman(1), D.Steeghs(1), D.Galloway(2)
K.Ackley(2), A.Obradovic(2), Y-L.Mong(2),
M.Dyer(3), V.Dhillon(3), P.O'Brien(4), G.Ramsay(5),
D.Pollacco(1), E.Thrane(2), S.Poshyachinda(6),
E.Palle(7), K.Wiersema(1), R.Cutter(1), A.Levan(1),
T. Marsh(1), R.West(1), B.Gompertz(1), E.Stanway(1),
A.Casey(2), M.Brown(2), E.Rol(2), J.Mullaney(3),
S.Littlefair(3), L.Makrygianni(3), E.Daw(3), J.Maund(3),
R.Starling(4), R.Eyles(4), S.Tooke(4), U.Sawangwit(6),
D.Mkrtichian(6), S.Awiphan(6), S.Aukkaravittayapun(6),
P.Irawati(6), M.Kennedy(8), R.Breton(8), D.Mata-Sanchez(8),
T.Heikkila(9), R.Kotak(9)
(1) Warwick University; (2) Monash University; (3) Univ. of Sheffield;
(4) University of Leicester; (5) Armagh Observatory & Planetarium;
(6) National Astronomical Research Institute of Thailand;
(7) Instituto de Astrofisica de Canarias; (8) Univ. of Manchester;
(9) University of Turku

report on behalf of the GOTO collaboration:

We carried out observations with the Gravitational-wave Optical
Transient Observer (GOTO), in response to the Fermi trigger 579036175
(GRB 190508A; GCN #24427
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 ).

We made a series of 3 x 60 s exposures using our wide L-band filter
(400-700 nm) with five pointings covering 75.9% of the estimated sky
probability region. Two independent sky passes started on 2019 May 8
21:04 UT (1.68 hrs post-burst) and 2019 May 9 1:12 UT.

Using a difference imaging analysis with recent survey observations
of the same pointings as reference, we identify no viable
counterparts. Our mean 5-sigma detection limit was g=20.6 mag based
on PS1 catalogue calibrators.


GOTO is operated at the La Palma observing facilities of the
University of Warwick on behalf of a consortium including the
University of Warwick, Monash University, Armagh Observatory, the
University of Leicester, the University of Sheffield, the National
Astronomical Research Institute of Thailand (NARIT) and the Instituto
de Astrofisica de Canarias (IAC) (https://goto-observatory.org)