[vsnet-grb-info 4557] GRB 070419B: optical afterglow confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6321
SUBJECT: GRB 070419B: optical afterglow confirmation
DATE:    07/04/19 20:08:51 GMT
FROM:    Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct at iaa.es>

A. de Ugarte Postigo, M. Jelínek (IAA-CSIC Granada),
P. Tristram (MOA, Univ. of Canterbury),  I. Bond
(Massey Univ.), Ph. Yock (Univ. of Auckland),
J. Hearnshaw (Univ. of Christchurch) and A. J. Castro-
Tirado (IAA-CSIC), on behalf of a larger collaboration,

report:

"We have continued the BVRI optical monitoring of the proposed
optical afterglow (Tristram et al. GCNC 6312) to GRB 070419B
(Parson et al. GCNC 6305) with the 0.6m B&C telescope at the
Mt. John Observatory on Lake Tekapo. We confirm the detection
in the VRI -bands and a derive a complex lightcurve (preliminary
analysis shows a steep decline up to T0 + 0.2 days and a plateau
phase lasting until the end of our observations at T0 + 0.3 days
with R ~ 21.0).

A more accurated astrometry (+/- 0.5") yields:

AR(2000): 21:02:49.78
Dec(2000): -31:15:48.8

A finding chart is posted at:
http://www.iaa.es/~deugarte/GRBs/070419B/GRB070419B.gif

Spectroscopic and photometric observations are encouraged."

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