[AAVSO-HEN] GRB070518: Optical/NIR observation

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  6443
SUBJECT: GRB070518: Optical/NIR observation
DATE:    07/05/21 23:40:21 GMT
FROM:    Paul Price at IfA,UH  <price at ifa.hawaii.edu>

P.A. Price (IfA, Hawaii) and T. Minezaki (IoA, Tokyo) report on behalf
of a larger collaboration:

We observed the optical afterglow of GRB070518 with the MAGNUM telescope
+ MIPS dual-beam camera.  Observations commenced 10.6 minutes after the
trigger, with a mid-point time of 2007 May 18.614 UTC.  Based on
calibration using a single USNO star (optical image; as for GCN #6418)
and single 2MASS star (NIR image), we find:

	R ~ 19.5 mag
	J ~ 18.8 mag

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