[vsnet-grb-info 24812] GRB 200125B: DDOTI/OAN optical observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26911
SUBJECT: GRB 200125B: DDOTI/OAN  optical observations report
DATE:    20/01/28 06:04:23 GMT
FROM:    Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada  <mpereyra at astro.unam.mx>

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 200125B detected by Fermi Gamma-ray Burst
Monitor (Fermi GBM Team, GCN Circ. 26879, Veres et al., GCN Circ. 26893),
with the DDOTI/OAN wide-field imager at the Observatorio Astronómico
Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) from
2020-01-26 02:18 to 2020-01-26 06:53 UTC (5.58 to 10.16 hours after the
event).

We observed a region of 6.8 degrees in RA by 10.2 degrees in declination
centered on the GBM Final Position 00:29:47 +64:41:22 J2000. This region
contains about 70 square degrees. We obtained about 3.1 hrs total exposure
across the region.

We calibrated our images against the APASS catalog. Our 10-sigma limiting
magnitude is w = 20.04 for a 2.0 degrees radius error region centered at
the GBM Final Position. Comparing to the USNO-B1 and PAN-STARRS DR1
catalogs we do not detect any uncataloged source with significant fading or
rising to our 10-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