[AAVSO-HEN] GRB 090618: SARA Second Epoch Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9575
SUBJECT: GRB 090618: SARA Second Epoch Observations
DATE:    09/06/25 21:08:25 GMT
FROM:    Adria C. Updike at Clemson U  <aupdike at clemson.edu>

Adria Updike, Sean Brittain, Dieter Hartmann (Clemson University), Andrew
Colson, Renata Cumbee, Brianne Hackett, Josiah Lewis, and Marten Kronberg
(SARA REU) report:

We re-observed the field of GRB 090618 (Schady et al., GCN 9512) using the
0.9m SARA telescope at Kitt Peak National Observatory beginning 20 hours
after the trigger and continuing for 3 hours.  Our observations consisted
of 45 sec exposures in the R and I bands under good conditions.  The
afterglow is detected in stacked images.  Magnitudes are given below as
compared to the USNOB.1 catalog.  Time is given in days after the trigger;
exposure time in seconds.

Time   Filter   Exp      Mag
------------------------------------
0.84     R      1215     19.4 +/- 0.1
0.86     I      1215     18.8 +/- 0.1


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