TITLE:   GCN CIRCULAR
NUMBER:  7135
SUBJECT: GRB 071112C: Optical/NIR observations
DATE:    07/11/26 22:26:00 GMT
FROM:    Paul Price at IfA,UH  <price@ifa.hawaii.edu>

T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA,
Tokyo) and L.L. Cowie (IfA, Hawaii) report:

We observed the optical afterglow of GRB 071112C (GCN #7059) with the
MAGNUM telescope + MIPS dual-beam imager in RIJHK bands, commencing at
2007-11-13T05:26Z.  We detect the afterglow in coadded images for each
of these bands, though only marginally in H and K.  The following
afterglow magnitudes were calibrated using the USNO-B1.0 and 2MASS
catalogues:

 Filter    midtime(UTC)   integ.time(min) magnitude
   R      2007-11-13 6.5h      39         22.18 +- 0.11
   I      2007-11-13 6.8h      39         22.06 +- 0.18
   J      2007-11-13 6.2h      19         21.1  +- 0.3
   H      2007-11-13 7.1h      18         21.2  +- 0.8  * marginally
   K      2007-11-13 6.8h      18         19.1  +- 0.3  * marginally

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