[vsnet-grb-info 19058] GRB 170202A: SQUEAN Observation (2nd night)

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20601
SUBJECT: GRB 170202A: SQUEAN Observation (2nd night)
DATE:    17/02/04 11:15:37 GMT
FROM:    Myungshin Im at Seoul Nat U  <mim at astro.snu.ac.kr>

Myungshin Im, Yongjung Kim, & Joonho Kim (CEOU/SNU)

We continued the observation of the GRB 170202A afterglow with the SQUEAN
instrument on the 2.1m Otto Struve telescope at the McDonald Observatory,
Texas. The 2nd night observation started at 2017-02-04 09:45:52 UT,
​ ​or
about 39.3 hours after the BAT alert.

The afterglow shows the following preliminary magnitude based on the
photometry calibration using SDSS stars in the vicinity.

 Filter    Mag (AB)  Mag_err   Exp.time  Start-time (UT)

r             21.8         0.15      180s x 10    09:45:52​