TITLE:   GCN CIRCULAR
NUMBER:  36090
SUBJECT: IPN triangulation of GRB 240411A
DATE:    24/04/14 14:00:48 GMT
FROM:    Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

D. Svinkin, D. Frederiks,  A. Lysenko, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,

A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,

E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

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

The long-duration GRB 240411A
(Fermi-GBM detection: The Fermi GBM team, GCN 36061;
GRBAlpha detection: Pal et al., GCN 36068)
was detected by Fermi (GBM trigger 734492703),
INTEGRAL (SPI-ACS), Swift (BAT), Konus-Wind, and GRBAlpha
at about 6298 s UT (01:44:58).
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
 ---------------------------------------------
 Center:
  246.889 (16h 27m 33s) +45.010 (+45d 00' 36")
 Corners:
  251.205 (16h 44m 49s) +41.318 (+41d 19' 05")
  251.479 (16h 45m 55s) +41.818 (+41d 49' 03")
  241.660 (16h 06m 38s) +48.434 (+48d 26' 03")
  241.553 (16h 06m 13s) +47.881 (+47d 52' 53")
 ---------------------------------------------
The error box area is 4.6 sq. deg, and its maximum
dimension is 9.8 deg (the minimum one is 29 arcmin).
The Sun distance was 111 deg.

This localization may be improved.

A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240411_T06302/IPN/


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