GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
559 results found.
- GRB 171112A: MAXI/GSC detection
- IceCube-171106A: Swift Observations
- GRB 171027A, Swift-BAT refined analysis
- Swift trigger 781740: Further analysis from Swift and Fermi/GBM
- Numerous Fermi-GBM Subthreshold Notices are due to Swift J0243.6+6
- Swift Trigger 775946 is a Galactic transient, not GRB 171003
- GRB 171003A: LT early optical observations
- GRB 170903A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 170822A
- LIGO/Virgo G298048: ATCA observations of candidate host galaxies
- Konus-Wind observation of GRB 170728B
- GRB 170714A, Swift-BAT refined analysis
- Fermi GBM Detection of possible burst from AXP 4U 0142+61
- GRB 170710B: Fermi GBM observation
- Konus-Wind observation of GRB 170705A
- LIGO/Virgo G268556: optical observations and classification of Pan-STARRS1 transients
- GRB 170524A: Swift-BAT refined analysis
- Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
- GRB 170405A: Swift detection of a burst with an optical counterpart
- LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
- LIGO/Virgo G275697: Updated localization from LIGO data
- LIGO/Virgo G275697: Swift-XRT sources
- Konus-Wind observation of GRB 170206A
- LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
- LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
- LIGO/Virgo G268556: GWAC_F60B (60cm) follow-up two events of EWE001 and EWE002
- LIGO/Virgo G268556/GW170104: Asiago Observations
- SUBJECT: LIGO/Virgo G268556: ATLAS17aeu - an unusual transient within the skymap
- GRB 161220A: Swift-BAT refined analysis
- GRB 161214A: fading optical afterglow candidate with the LT
- Konus-Wind observation of GRB 161202A
- GRB 161113A: Swift/UVOT Upper Limits
- GRB 161109A: Swift-XRT observations
- Konus-Wind observation of GRB 161020B
- GRB 161004A: Swift-BAT refined analysis
- GRB 160927A: Swift-BAT refined analysis
- GRB 160821B: Fermi GBM Detection
- IPN Triangulation of GRB 160720A
- GRB 160629A: SAO RAS independent OT detection
- GRB 160625B CALET Gamma-Ray Burst Monitor detection
- Konus-Wind observation of GRB 160625B
- Konus-Wind observation of GRB 160530A
- Konus-Wind observation of GRB 160521B
- SGR 1935+2154: AbAO optical upper limit
- GRB 160504A: Swift detection of a burst
- GRB 160424A: Swift-BAT refined analysis
- GRB 160412A: Swift-BAT refined analysis
- GRB 160303A, Swift-BAT refined analysis
- GRB 160221A: MASTER-SAAO early observations
- Konus-Wind observation of GRB 160220B
- LIGO/Virgo G211117: Further Swift-XRT sources
- Konus-Wind observation of GRB 151231A
- Konus-Wind observation of GRB 151225A
- GRB 160104A: MITSuME Akeno Optical Observation
- GRB 151231A: Fermi GBM observation
- GRB 151228B: Swift-BAT refined analysis
- GRB 151229A: Swift-BAT refined analysis
- GRB 151228B: Swift detection of a burst with an optical detection
- GRB 151114A: Swift/UVOT Detection
- GRB 151114A: Swift detection of a burst with an optical counterpart
- GRB 151112A: MAXI/GSC detection
- GRB 151027A: Mondy optical observations
- GRB 151027A: Optical counterpart detection
- Konus-Wind observation of GRB 151027A
- GRB 151027A: LCOGT-McDonald afterglow observations
- GRB 151027B: Swift-XRT refined Analysis
- GRB 151027A: VLA detection
- GRB 151027A: THO optical observations
- GRB 151027A : ISON-NM early optical detection
- GRB 151027A: KAIT optical afterglow confirmation
- GRB 151027A: Swift detection of a burst with a bright optical afterglow
- LIGO/Virgo G194575: ASKAP followup
- LIGO/Virgo G184098: ASKAP followup
- GRB 150818A: Swift-BAT refined analysis
- GRB 150716A: Swift-BAT refined analysis
- GRB 150710A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 150607A
- GRB 150530A: Swift-BAT refined analysis
- IPN Triangulation of a bright burst from SGR 1935+2154
- GRB 150302A, Swift-BAT refined analysis
- GRB 150301A: Fermi GBM observation
- Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
- Fermi GBM Observations of Magnetar 4U 0142+61
- Trigger 632888: Swift detection of the magnetar 4U 0142+61
- SGR 1935+2154: Swift-BAT refined analysis
- GRB 150211A: Swift-BAT refined analysis
- GRB 150203A: Swift/UVOT Upper Limits
- GRB 150127B: Fermi GBM detection
- GRB 150120B: Swift-BAT refined analysis
- GRB 141221A: Swift-BAT refined analysis
- GRB 141220A: Swift-BAT refined analysis
- GRB 141212A: MITSuME Akeno upper limits
- GRB 141026A: SAO RAS Zeiss-1000 observations
- GRB 141020A: Swift-BAT refined analysis
- GRB 140930B Swift-BAT refined analysis
- GRB 140903A: Swift-BAT refined analysis
- GRB 140829A: iPTF optical observations
- GRB 140709A, Swift-BAT refined analysis
- GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
- GRB 140622A: TAROT La Silla observatory optical observations