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').
453 results found.
- Konus-Wind observation of GRB 190103A
- IceCube-190104A: MASTER optical observation
- GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
- MASTER OT J063515.49-624002.9 of Fermi trigger 565936249: optical observations in SAAO
- IPN Triangulation of GRB 181008B (long)
- GRB 180722A: MASTER optical observation
- GRB 180718B: MASTER optical observation
- GRB 180703B: further analysis of CGBM data
- Konus-Wind observation of GRB 180704A
- GRB 180611A: Fermi GBM observation
- Swift trigger 831888: misidentification of 4U 1416-62
- GRB 180510B: GROND detection in all bands
- GRB 180510B: Swift detection of a burst with an optical counterpart
- GRB 180416B: CALET Gamma-Ray Burst Monitor detection
- Konus-Wind observation of GRB 180318A
- GRB 180111A: AbAO optical observations
- GRB 180102A: Prompt enhanced Swift-XRT position
- Konus-Wind observation of GRB 171227A
- GRB 171115A: Swift-XRT refined Analysis
- GRB 171007A: Swift-XRT refined Analysis
- LIGO/Virgo G297595/GW170814: updated localization from parameter estimation
- Konus-Wind observation of GRB 170822A
- LIGO/Virgo G297595: Nearby Galaxies in the Localization Volume
- LIGO/Virgo G297595: Fermi GBM Observations
- GRB 170810A: Swift detection of a burst with a bright optical counterpart
- LIGO/Virgo G296853 ANTARES search
- Konus-Wind observation of GRB 170728B
- Fermi GBM Detection of possible burst from AXP 4U 0142+61
- Konus-Wind observation of GRB 170705A
- GRB 170705A: Swift-XRT refined Analysis
- Swift Trigger 755873: MASTER Net optical observations
- GRB 170522A: Global MASTER-Net job
- GRB 170428A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 170424A
- IPN Triangulation of GRB 170320A (long/intense)
- GRB 170228A: Fermi GBM observation
- LIGO/Virgo G274296 and G275404 : MAXI/GSC observations
- LIGO/Virgo G275697: Swift-XRT sources
- LIGO/Virgo G274296: HAWC follow-up
- Konus-Wind observation of GRB 161202A
- GRB 161202A: Astrosat CZTI detection
- Swift Trigger 718766 is not an astrophysical event.
- Konus-Wind observation of GRB 161010A
- GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
- GRB 160821B: VLA 5.0 GHz observations
- GRB 160821B: NOT optical afterglow candidate
- Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
- Konus-Wind observation of GRB 160625B
- Konus-Wind observation of GRB 160530A
- GRB 160501A: Swift/UVOT Upper Limits
- GRB 160409A found in Swift BAT ground analysis
- GRB 160310A: Fermi-LAT detection
- GRB 160303A: Continued optical monitoring from NOT
- GRB 160303A: JCMT SCUBA-2 sub-mm observation
- Konus-Wind observation of GRB 160220B
- GRB 160107A: Fermi GBM observation
- Konus-Wind observation of GRB 151225A
- GRB 160101A: MAXI/GSC detection
- Swift detection of 4U 1850-03
- GRB 151205B: Deep GROND Upper limits
- GRB 150810A: Fermi GBM detection
- GRB 150801B: Swift-BAT refined analysis
- Konus-Wind observation of GRB 150607A
- Konus-Wind observation of GRB 150510A
- GRB 150403A: Swift/UVOT Detection
- GRB 150403A: Swift detection of a burst with an optical counterpart
- GRB 150301B: 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
- Trigger 631747: Swift detection of 4U 0614+09
- GRB 150203A: REM optical and NIR observations
- Swift detection of 4U 1700+24 (= V* V934 Her)
- GRB 150103A: Zadko observatory - Gingin optical observations
- Swift detection of 4U 1700+24 (= V934 Her)
- GRB 141212A: MITSuME Okayama upper limits
- Swift detection of outburst from 4U 1700+24
- GRB 140818A: MAXI/GSC detection
- Swift trigger 609139 is probably 4U 1850-03
- GRB 140713A : Xinglong TNT upper limit
- GRB 140706A: Swift-XRT refined Analysis
- Konus-Wind observation of GRB 140604A
- Konus-Wind observation of GRB 140512A
- GRB 140509A: Swift/UVOT Detection and photo-z
- GRB 140509A: Swift detection of a burst with an optical counterpart
- GRB 140402A BAT refined analysis
- GRB 140323A: Swift detection of a burst
- GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
- GRB 131126A: Fermi GBM observation
- Konus-Wind observation of GRB 131125A
- IPN Triangulation of GRB 131127B
- GRB 131127A: Swift-XRT refined Analysis
- GRB 131105A: VLT/X-shooter optical afterglow candidate
- GRB 131028A: Fermi GBM detection
- GRB 131004A, Swift-BAT refined analysis
- GRB 131002B: Swift/UVOT Upper Limits
- GRB 131002B: Swift detection of a burst
- GRB 130822A: Swift/UVOT Upper Limits
- GRB 130812A: Swift-XRT refined Analysis