Difference: GCNCIRCULAR20784 ( vs. 1)

Yoshida, M., Utsumi, Y., Nakaoka, T., Abe, T., Nagashima, H., Kawabata, K. S., Kawabata, M., Shiki, K. (Hiroshima U.), Ohsawa, R. and Sako, S. (U. of Tokyo) on behalf of J-GEM collaboration

We performed near-infared H-band observations of nearby galaxies in the error circle of the gamma-ray transient candidate found in the AGILE-GRID data, AGL J1914+1043 (Tavani et al. GCN 20754), which is located at the edge of the skymap of G275404 (GCN 20738) with 1.5m Kanata telescope on UT 2017-02-27. The instrument used was an optical near-infrared simultaneous camera HONIR.

We found a bright near-infrared transient in the observed field of GL191032+075314. The data was taken at 20:32UT on 2017-02-27. The H-band AB magnitude of the source was 16.3 +- 0.02. The location of the source is

RA=19:10:31.46, DEC=+07:53:52.0 .

We also conducted an I-band observation for this area simultaneously. No transient source was detected with the 5-sigma I-band limiting magnitude of 19.6. There is no bright counterpart in 2MASS H-band data, but a point source (SSTGLMC G042.1312-00.6118; in GLIMPSE I Spring '07 Catalog) is clearly seen at the same position in 3.6 um data taken by Spitzer GLIMPSE survey.

The observation log with 5-sigma limiting magnitudes is shown below.

Telescope: Kanata 1.5m telescope

-- ThomasKupfer - 01 Mar 2017