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GCN Circular 29182

IPN triangulation of GRB 201227A (short)
2020-12-28T01:07:52Z (4 years ago)
Dmitry Svinkin at Ioffe Institute <>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

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,

S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team, and

A. Ursi, N. Parmiggiani, F. Verrecchia, A. Bulgarelli,
A. Trois, M. Marisaldi, C. Pittori, M. Tavani, Y. Evangelista,
I. Donnarumma, M. Cardillo, G. Piano, G. Minervini, A. Argan,
F. Lucarelli, A. Zoli, V. Fioretti, F. Fuschino, M. Pilia,
F. Longo, A. Giuliani on behalf of the AGILE team, report:

The short-duration, very bright GRB 201227A
(AGILE detection: Ursi et al., GCN Circ. 29179)
has been detected by Fermi (GBM trigger 630774852), Konus-Wind,
INTEGRAL (SPI-ACS), AGILE (MCAL), and Swift (BAT), so far,
at about 54847 s UT (15:14:07).
The burst was outside the coded field of view of the BAT.

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
- ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
   170.121 (11h 20m 29s) -73.613 (-73d 36' 48")
   171.971 (11h 27m 53s) -73.140 (-73d 08' 22")
   171.755 (11h 27m 01s) -73.060 (-73d 03' 36")
   168.169 (11h 12m 41s) -74.071 (-74d 04' 16")
   168.379 (11h 13m 31s) -74.155 (-74d 09' 17")
The error box area is 517 sq. arcmin, and its maximum
dimension is 1.45 deg (the minimum one is 6 arcmin).
The Sun distance was 72 deg.

This box may be improved.

The Swift ToO has been submitted.

A triangulation map is posted at

The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
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