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Ultraviolet, Optical and near-infrared photometric follow up of the transient source Fermi J1654-1055 with GROND and Swift-UVOT

ATel #8743; A. Kaur (Clemson University), J. Bolmer, J. Greiner, A. Rau, P. Schady (all MPE, Garching), M. Ajello, D. H. Hartmann (all Clemson University)
on 26 Feb 2016; 19:40 UT
Credential Certification: Marco Ajello (majello@clemson.edu)

Subjects: Infra-Red, Optical, AGN, Blazar, Transient

Ultraviolet, Optical and near-infrared photometric follow up of the transient source Fermi J1654-1055 with GROND and Swift-UVOT

A. Kaur (Clemson University), J. Bolmer, J. Greiner, A. Rau, P. Schady (all MPE, Garching), M. Ajello, D. H. Hartmann (Clemson University)

We report the ultraviolet, optical and near IR photometric observations of the new gamma-ray source Fermi J1654-1055/PMN J1632-1052 (RA = 248.20900 deg and Dec = -10.87578 deg) detected by Fermi during the week of February 08 and 15, 2016 (see ATel #8721). The optical and near IR observations were obtained on February 23.37 UT and Feb 25.35 UT, 2016 with the 7 color imager, GROND (Greiner et al. 2008) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). The data were taken at an airmass = 1.19.

The derived magnitudes for g', r', i', z' were calibrated against the SDSS field stars and J, H and K against the 2 MASS stars. The transient brightened by 0.7 mag as compared to the first epoch of GROND observations. Moreover, this transient is brighter by approximately 2 magnitudes as compared to the SDSS data release 12 observations, which were performed on June 06, 2005. The observed magnitudes in the AB system, not corrected for foreground extinction (E(B-V)=0.34 mag, Schlafly & Finkbeiner 2011) in each filter are listed below :

GROND photometry
Filter SDSS 12 GROND Feb 23 GROND Feb 25 Exposure
g' 21.41 19.98 ± 0.04 19.18 ± 0.03 462.0
r' 21.07 19.12 ± 0.04 18.34 ± 0.03 528.0
i' 20.34 18.59 ± 0.05 17.78 ± 0.03 528.0
z' 20.04 18.14 ± 0.05 17.29 ± 0.03 528.0
J - 17.31 ± 0.10 16.59 ± 0.05 480.0
H - 16.75 ± 0.11 16.04 ± 0.05 480.0
K - 16.22 ± 0.14 15.67 ± 0.07 480.0

Swift-UVOT (Gehrels et al. 2004) observed the source in u, b, v, w1 and w2 on Feb 25.30 UT, 2016. The resultant magnitudes are displayed in the table below:

Swift photometry
Filter UVOT mag Exposure
u > 19.88 96.00
b > 18.72 55.00
v > 18.18 96.00
w1 > 20.08 110.00
w2 > 20.61 220.00