CV Alerts from OASys #7
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Andrii Simon
Sep 29, 2026, 12:32:23 PM (13 days ago) Sep 29
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Dear BHTOM community,
We have prepared some updates regarding our ongoing observing campaign:
1. Gaia19bnd is brightening again and appears to be entering a new outburst. We are waiting for its next superoutburst, so we kindly ask you to obtain long time-series observations of this object during the next few nights to determine whether this is another normal outburst or whether the object is finally entering a superoutburst with superhumps.
2. MGAB-V233 remains a high-priority object for monitoring. It is still in superoutburst and is currently at approximately 15.7 mag. We hope to collect high-quality data until the end of the ongoing superoutburst, which may last for another 10 days.
3. Gaia22cax is still in outburst, and the Moon is moving farther away from the object each night. We therefore ask you to continue intensive time-resolved monitoring until the object begins to fade significantly. After that, observations can be reduced to only a few measurements per night.
4. Objects for long-term monitoring. For the following objects, we cannot yet predict the next outburst within a sufficiently narrow time window. Therefore, only a few measurements per night in the V and R (or g and r) filters are needed.
4a. Gaia15aan — possible WZ Sge-type dwarf nova; coordinates: 16:05:47.993 +24:05:31.056. The next superoutburst may occur at any time.
4b. Gaia21btc — possible SU UMa-type dwarf nova; coordinates: 03:10:55.010 +47:22:16.30. The next superoutburst may occur during spring–autumn 2027, but we currently have no confirmed information about normal outbursts in this system.
1. Gaia19bnd is brightening again and appears to be entering a new outburst. We are waiting for its next superoutburst, so we kindly ask you to obtain long time-series observations of this object during the next few nights to determine whether this is another normal outburst or whether the object is finally entering a superoutburst with superhumps.
2. MGAB-V233 remains a high-priority object for monitoring. It is still in superoutburst and is currently at approximately 15.7 mag. We hope to collect high-quality data until the end of the ongoing superoutburst, which may last for another 10 days.
3. Gaia22cax is still in outburst, and the Moon is moving farther away from the object each night. We therefore ask you to continue intensive time-resolved monitoring until the object begins to fade significantly. After that, observations can be reduced to only a few measurements per night.
4. Objects for long-term monitoring. For the following objects, we cannot yet predict the next outburst within a sufficiently narrow time window. Therefore, only a few measurements per night in the V and R (or g and r) filters are needed.
4a. Gaia15aan — possible WZ Sge-type dwarf nova; coordinates: 16:05:47.993 +24:05:31.056. The next superoutburst may occur at any time.
4b. Gaia21btc — possible SU UMa-type dwarf nova; coordinates: 03:10:55.010 +47:22:16.30. The next superoutburst may occur during spring–autumn 2027, but we currently have no confirmed information about normal outbursts in this system.
4c. Gaia20cdc
— possible SU UMa-type dwarf nova; coordinates: 04:11:09.300 -59:11:16.332
We look forward to receiving your observations on BHTOM. Your observations are extremely valuable for understanding the outburst behaviour and superhump evolution of these systems. Thank you very much for your continued contributions to the BHTOM observing campaign.
With kind regards,
Andrii Simon
on behalf of OASys
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