[vsnet-grb-info 24693] GRB 200115A: DDOTI/OAN optical observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26792
SUBJECT: GRB 200115A: DDOTI/OAN  optical observations report
DATE:    20/01/16 20:59:20 GMT
FROM:    Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra at astro.unam.mx>

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

We observed the field of GRB 200115A detected by BAT/Swift (Cenko, GCN
Circ. 26771), with the DDOTI/OAN wide-field imager at the Observatorio
Astronómico Nacional on Sierra San Pedro Mártir (
http://ddoti.astroscu.unam.mx) from 2020-01-16 02:01 to 2020-01-16 02:19
UTC (14.2 to 14.48 hours after the event).

We observed a region of 6.8 degrees in RA by 10.2 degrees in declination
centered on the peak of the Swift-BAT on-board calculated location
03:45:48.7 +05:36:26.0 J2000. This region contains about 70 square degrees.
We obtained about 16 minutes total exposure across the region.

We calibrated our images against the APASS catalog. Our 3-sigma limiting
magnitude is w = 19.80 for the enhanced Swift-BAT error region (Laha et
al., GCN Circ. 26780). Comparing to the USNO-B1 and SDSS DR9 catalogs we do
not detect any uncataloged source  to our 3-sigma limit.

We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.


-- 
*Dr. Margarita Pereyra *

*FFTF, Schlumberger Foundation Alumnae*
----------------------------------------------------------------------------------------------------------------

*Catedrático Conacyt*

*Instituto de Astronomía de la UNAM,*

*Km. 107 Carretera Tijua**na-Ensenada, *

*Ensenada Baja California, México. C.P. 22860*

Oficina: 405

Skype: margarita-pereyra