S240615dg (BBH)

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Log of the Observations

15 June:

• 11:36 AM: BBH candidate: https://gracedb.ligo.org/superevents/S240615dg/
• Meantime: discussion of strategies in slack channel
• 18:08 PM: Decided to observe jointly the source: standard pointing strategy with standard wobble offset (0.4deg) centering in coordinates: RA:7.52 (00:30:05). DEC:+45.81 (+45:48:32). Observations starting ~2:15 UTC to ~4:30 UTC.

S240615dg (BBH)

For MAGIC:

• Observations: June 16, 02:30 - 04:38 UT - Standard wobble W040+000 W040+090 on coordinates: RA: 00:30:05 Dec: +45:48:32.
• Final observations:

----------------------------------------------------------------------
Source                    Kind       Time      Evts    Rate     Zd   
                                     (min)             (Hz)    (deg) 
----------------------------------------------------------------------
S240615dg-W0.40+000                    38      724k    317    47->64  
S240615dg-W0.40+090                    19      350k    305    53->57  
S240615dg-W0.40+180                    38      692k    304    42->60   
S240615dg-W0.40+270                    19      328k    287    50->53
----------------------------------------------------------------------

Other multifrequency and multimessenger observations reported

• The first LIGO-Virgo Coll. (LVC) GCN June 15: https://gcn.nasa.gov/circulars/36669
• Upper limits by SWIFT/GUANO June 18: https://gcn.nasa.gov/circulars/36687
• Upper limits by Swift/XRT June 19: https://gcn.nasa.gov/circulars/36698
• An updated sky localisation by LVC June 19: https://gcn.nasa.gov/circulars/36704
• A list of upper limits by optical telescope GRANDMA/FRAM-CTA-N June 19: https://gcn.nasa.gov/circulars/36705

LST Results

• FOA S240615dg (BBH)
• RTA:

MAGIC Results

• analysis ongoing

Joint LST+MAGIC results

• analysis ongoing