Difference: GCNCIRCULAR21889 ( vs. 1)

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21889
SUBJECT: LIGO/Virgo G298048: Danish Telescope Observations of SSS17a/DLT17ck
DATE: 17/09/15 16:40:07 GMT
FROM: Zach Cano at U of Iceland <zewcano@gmail.com>

Z. Cano (IAA-CSIC), U. G. Jorgensen (Univ. of Copenhagen), G. Hodosan (IAA-CSIC, Univ. of St Andrews), R. Figuera Jaimes (Univ. of St Andrews), Y. I. Fujii (Univ. of Copenhagen; Nagoya Univ.), and M. Rabus (Pontificia Univ. Catolica de Chile, MPIA)

We report on observations obtained with the 1.54-m Danish Telescope located at La Silla, Chile, of the GW counterpart SSS17a/DLT17ck (Coulter et al., LVC GCN 21529). Observations were obtained on 2017, August 19th, 21st and 22nd in the I-band (all three dates), and z-band (19th only). A summary of the observations follows:

Date UT Start Exposure time (s) Filter

19-August 23:41:45.6 6 x 150 I
19-August 23:44:49.9 6 x 150 z
21-August 23:17:51.8 25 x 100 I
22-August 23:23:57.3 40 x 100 I

Image subtraction of the co-added I-band images obtained during the first two nights reveals a residual transient at the following position:

RA, Dec (J2000): 13:09:48.11 -23:22:53.0

With an estimated uncertainty of ~0.5''. This position is consistent with that found by other groups within its uncertainty radius.

Further analysis of the images is currently underway, including the precise photometric calibration of the optical transient.

-- ThomasKupfer - 20 Sep 2017

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