TITLE: GCN CIRCULAR NUMBER: 24351 SUBJECT: LIGO/Virgo S190426c: GROWTH India follow-up of GRAWITA transient DATE: 19/04/30 10:43:09 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar, V. Karambelkar, V. Bhalerao, K Deshmukh, M. Khandagale (IITB), G. C. Anupama, T. Stanzin, U. Stanzin (IIA) report on behalf of the GROWTH collaboration: We observed the field of GRAWITA_J215716.26+832239.4 reported by L. Izzo et.al. (GCN 24340) at 2019-04-29T21:04:39.694 UT with the 0.7m GROWTH-India telescope. The image was taken in r filter with 600 sec exposure. We did not find any source at the specified position up to mag_lim ~ 19.8, calibrated with PS1 photometry. We also continued follow-up of the localisation region of the GW candidate event S190426c (LVC et al. GCN 24168, G. Waratkar et. al. GCN 24316) with the GROWTH-India telescope in the northernmost part of the sky. We obtained 43 r-band overlapping images covering a total area of 12.1 square degrees, with 8.9% probability of containing the GW counterpart on 20190428 and 16 r-band overlapping images covering a total area of 4.4 square degrees, with 4.1% probability of on 20190829. Exposures were 600 seconds long and reached a typical depth of 20.5 magnitude. Data processing is underway. On 20190428 (20190429), these fields contain 313(104) galaxies from the GLADE catalog and 10(4) galaxies from NED. No obvious transients were seen in the NED galaxies. The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).