IGR J19556+0326


Other name = MAXIJ1957+032

Type Redshift Radio Counterpart Infrared/Optical Counterpart
R.A. (J2000) Dec. (J2000) References R.A. (J2000) Dec. (J2000) References
19h 56 39.11s +3° 26m 43.7s Rau et al. 2015 ATel 7524
Published Papers
Miscellaneous :
Cherepashchuk et al. 2015,ATel 7506, and Molkov et al. 2015 ATel 7520 :
  • INTEGRAL discovery and Swift follow up => refinement of the postion
  • Spectral analysis => absorbed power-law model : NH = 0.35e22 cm-2, Γ = 2.92
  • Extrapolation of the XRT spectrum to the 20-60 keV range => 5 times lower INTEGRAL flux => potential decay of a possible outburst or more complex spectrum shape.
  • USNO B1 source has R=19.15
  • Quick outburst decay observed with Swift monitoring
  • log slope of outburst time decay=0.3-0.4 days
Rau et al. 2015,ATel 7524 :
  • GROND discovery of optical counterpart
  • Error on optical position is 0.2"
  • g' = 20.28, r' = 20.03, i' = 19.64, z' = 19.84, J = 19.75, H = 19.93, K = >19.0
  • Second epoch of observation => fading to r=21.2
  • No GROND object detected at the position of the USNO B1 source.
Sugimoto et al. 2015,ATel 8143 :
  • New outburst detected with MAXI/GSC on 2015 october 6
Kennea et al. 2015,ATel 8146 :
  • Swift follow up of new outburst => refined position with UVOT
  • XRT spectrum: absorbed power law NH=4.4x 1021 cm-2, Γ=2.
Gulver et al. 2015,ATel 8149 :
  • Optical observations with TUBITAK National Observatory T100 telescope
  • A source detected at the location of optical counterpart previously reported: R18.27
  • Image of the field

Last updated 14 October 2015

Jerome Rodriguez