TITLE:   GCN CIRCULAR
NUMBER:  24086
SUBJECT: LIGO/Virgo S190408an: DDOTI/OAN Optical Observations
DATE:    19/04/10 02:04:51 GMT
FROM:    Alan M Watson at UNAM  <alan@astro.unam.mx>

Alan M. Watson (UNAM), Eleonora Troja (GSFC/UMD), Nat Butler (ASU), Rosa
L. Becerra (UNAM), Simone Dichiara (UMD), Diego González (UNAM),
Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Margarita Pereyra
(UNAM), and Tanner Wolfram (ASU) report:

We observed the region of maximum probability of the LIGO/Virgo
candidate S190408an with the DDOTI/OAN wide-field imager at the
Observatorio Astronómico Nacional on Sierra San Pedro Mártir
(http://ddoti.astroscu.unam.mx).

We observed a region of approximately 11 degrees in declination by 7
degrees in RA centered on 23:26:00 +54:46:00 2000 from 2019-04-09 11:03
UTC to 12:08 UTC (16.8 to 17.8 hours after trigger) obtaining a total of
42 minutes exposure in the w filter at high airmass.

Analysis is ongoing and interesting transient source will be reported
later.