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.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
552 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
- Swift Trigger 718766 is not an astrophysical event.
- Konus-Wind observation of GRB 161020B
- GRB 161004A: Swift-BAT refined analysis
- GRB 160927A: Swift-BAT refined analysis
- GRB 160821B: Fermi GBM Detection
- Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
- IPN Triangulation of GRB 160720A
- 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
- GRB 160504A: Swift detection of a burst
- GRB 160424A: Swift-BAT refined analysis
- GRB 160409A found in Swift BAT ground 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
- Swift detection of 4U 1850-03
- 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
- 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
- Trigger 631747: Swift detection of 4U 0614+09
- GRB 150211A: Swift-BAT refined analysis
- GRB 150203A: Swift/UVOT Upper Limits
- GRB 150127B: Fermi GBM detection
- GRB 150120B: Swift-BAT refined analysis
- Swift detection of 4U 1700+24 (= V* V934 Her)
- GRB 141221A: Swift-BAT refined analysis
- GRB 141220A: Swift-BAT refined analysis
- Swift detection of 4U 1700+24 (= V934 Her)
- 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
- Swift detection of outburst from 4U 1700+24