V404 Cyg HST multiwavelength observations scheduled
Active Dates: July 10, 2015 – July 12, 2015
Abstract:
The dramatic outburst of the black hole X-ray transient LMXB V404 Cyg continues. It was detected 2015 June 16.1688 UT at 16.18 CV +/-0.035. V404 Cyg has been observed by the professional and amateur community across the spectrum from X-ray to radio wavelengths. Large- and small-scale variations have been seen occurring at timescales ranging from seconds to hours, with changes of 2-3 magnitudes over a few hours. Swift has detected a dust halo around V404 Cyg. Far-ultraviolet (FUV) and near-ultraviolet (NUV) spectroscopic observations with the Hubble Space Telescope have been scheduled for 2015 July 10, 11, and 12.
Justification:
Regardless of location, all observers are requested to continue to observe V404 Cyg. Time-series observations are requested during as much of the HST observation intervals as possible, in as many bands as possible. A high cadence is recommended in order to detect the very short-period variations that have been seen.
Requested Data Types:
Photometry, Spectroscopy
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| R Cyg | 6.10 | M |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
Principal Investigator: C. Knigge; Imported Campaign (Alert Notice #522)