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TITLE:   GCN CIRCULAR
NUMBER:  27159
SUBJECT: GRB 200221A: Fermi GBM Final Real-time Localization
DATE:    20/02/21 04:03:14 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM  <do_not_reply@GIOC.nsstc.nasa.gov>

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

At 03:52:58 UT on 21 Feb 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200221A (trigger 603949983.711252 / 200221162).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 157.1, Dec = 33.1 (J2000 degrees, equivalent to J2000 10h 28m, 33d 06'), with a statistical uncertainty of 5.0 degrees.

The angle from the Fermi LAT boresight is 122.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200221162/quicklook/glg_skymap_all_bn200221162.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/bn200221162/quicklook/glg_healpix_all_bn200221162.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200221162/quicklook/glg_lc_medres34_bn200221162.gif

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TITLE:   GCN CIRCULAR
NUMBER:  27210
SUBJECT: IPN triangulation of GRB 200221A (short)
DATE:    20/02/25 19:00:47 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin@mail.ioffe.ru>

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, and

S. Xiao, C. K. Li, X. B. Li, Y. Huang, and S. L. Xiong
on behalf of the Insight-HXMT GRB team, report:

The short-duration GRB 200221A (The Fermi GBM team, GCN Circ. 27159)
was detected by Fermi (GBM trigger 603949983), Konus-Wind,
INTEGRAL (SPI-ACS), and Insight (HXMT/HE)
at about 13979 s UT (03:52:59).

We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
  --------------------------------
   RA(2000), deg   Dec(2000), deg
  --------------------------------
  Center:
    178.682        +33.400
  Corners:
    182.119        +35.008
    132.491        +48.390
    141.935        +43.606
    175.374        +31.702
    179.446         +3.183
    183.926         -3.580
  ---------------------------------
The error box area is 455 sq. deg, and its maximum
dimension is 68.5 deg (the minimum one is 6.5 deg).
The Sun distance was ~140 deg.

The IPN localization is consistent with, but reduces the area of, the 
Fermi-GBM one.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200221_T13983/IPN

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