Difference: GCNCIRCULAR21575 ( vs. 1)

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21575
SUBJECT: LIGO/Virgo G298048: Archival 2MASS and Spitzer non-detections of the potential LIGO EM counterpart SSS17a
DATE: 17/08/18 20:23:05 GMT
FROM: Leo Singer at NASA/GSFC <leo.p.singer@nasa.gov>

S. Eikenberry, K.Ackley, and S. Klimenko (U. Florida) report:

We have investigated archival 2MASS (28 Apr 1998) and Spitzer (12 Oct 2014) infrared observations of the field of SSS17a (Coulter et al. LVC GCN 21529). We find no evidence of a point-like source at this location. While the presence of the host galaxy somewhat complicates sensitivity estimates, in the case of 2MASS we have a preliminary estimate for a 3-sigma upper limit of J(Vega) ~ 17.6 +- 0.2 mag, which corresponds to J(AB) ~ 18.5 +- 0.2 mag. This is a factor of ~2.5 fainter than the J(AB)=17.5 mag detection of Tanvir et al. (LVC GCN 21544), indicating a variable or transient nature for this source. More detailed analyses of the upper limits for both 2MASS and Spitzer are forthcoming.

-- ShaonGhosh - 18 Aug 2017

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