TITLE:   GCN CIRCULAR
NUMBER:  39707
SUBJECT: EP trigger ID 01709061302: Lick/Kast spectroscopy with the 3 m Shane telescope
DATE:    25/03/13 19:38:57 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

WeiKang Zheng, Thomas G. Brink, Alexei V. Filippenko (UCB), Andy Skemer,

Naunet Leonhardes-Barboza, Jordan Forman, Mayra Gutierrez, Isabelle Jones,

Ravjit Kaur, Petra Mengistu, Avi Patel, Anavi Uppal, Nicole Wolff, and

Michele Woodland (UCSC), report on behalf of the KAIT GRB team:



We observed the K-type star PM J23221-0301, the possible optical counterpart

of an EP flare event (trigger ID 01709061302; Shui et al., GCN 37615), with

the Kast spectrograph on the 3 m Shane telescope at Lick Observatory.

Observations were performed on Sep. 27.164 UTC, about 2.79 hours after the

trigger, covering the 5800-7400 Ang wavelength range. The spectrum shows a

red continuum with narrow absorption lines consistent with a K-type star

spectrum. In particular, there is a very strong H-alpha emission line

in the spectrum.


Another spectrum of PM J23221-0301 was taken the following night on Sep.
28.320,

about 1.272 days after the trigger, covering the 3500-10,000 Ang wavelength

range. The H-alpha emission line had nearly faded away compared to the
previous

spectrum. We therefore confirm this to be the flare star related to the EP

flare event.


In addition, a new spectrum of star 2MASS J18351416+2435115 was taken on

Sep. 28.216. Compared with the spectrum taken 3 days earlier (Zheng et al.,
GCN

37618), the Balmer emission lines faded significantly, confirming this star

to be the flare star related to the EP flare event (trigger ID 01709059262;

Liu et al., GCN 37593, 37594).