GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"27602 results found.
- GRB 160623A: SAO RAS optical observations
- GRB 160625B: Global MASTER-Net prompt optical emission detection
- GRB 160625B: SAO RAS optical observations
- SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
- GRB 160625B: TSHAO optical observations
- GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
- GRB 160625B: RATIR Optical and NIR Observations
- GRB 160625B: TNG redshift confirmation
- GRB 160625B: VLT/X-shooter redshift
- Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
- Swift-BAT refined analysis on the bright event from SGR 1935+2154
- Swift Trigger 701668 is probably not an astrophysical event
- IPN Triangulation of GRB 160620A (short/hard)
- GRB 160625A: Swift/UVOT Upper Limits
- GRB 160625A: Swift-BAT refined analysis
- GRB 160625A: Swift-XRT refined Analysis
- Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
- GRB 160625B: Swift/UVOT Detection
- GRB 160625B: RATIR Optical and NIR Afterglow Detection
- GRB 160625B: Fermi GBM refined analysis
- GRB 160625B: Fermi-LAT refined analysis
- GRB 160623A: SMA submm afterglow observations
- GRB 160625B: Fermi GBM initial observations
- GRB 160625B: Fermi-LAT detection of a bright burst
- GRB 160625A - two different events?
- GRB 160625A: Swift-XRT observations
- GRB 160625A: Swift detection of a burst
- GRB 160624A: Swift/UVOT Upper Limits
- GRB 160624A: Swift-XRT refined Analysis
- GRB 160624A: Fermi GBM observation
- GRB 160624A, Swift-BAT refined analysis
- GRB 160623A: Swift/UVOT Upper Limits
- GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
- GRB 160624A: Swift detection of a short burst
- Swift detection of a dust-scattered halo around GRB 160623A
- GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
- Trigger 701182: Swift detection of SGR 1935+2154
- GRB 160623A: Fermi GBM detection/observation
- GRB 160623A / Galactic transient: Fermi-LAT detection
- SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
- Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
- Fermi GBM Trigger 160622573 is not a GRB
- BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
- GRB 160622A: Swift detection of a possible short GRB or a new SGR
- More FERMI GBM bursts from the magnetar SGR 1935+2154
- Fermi GBM trigger 488128598/160620637 is not a GRB
- Fermi GBM trigger 487974449/160618852 is not a GRB
- Konus-Wind observation of GRB 160612A
- GRB 160612A: Swift-XRT observations
- BAT detection and localization of GRB 160612A
- GRB 160612A: Swift ToO observations
- IPN Triangulation of GRB 160612A (short/hard)
- GRB 160519A: 15 GHz upper limits from AMI
- GRB 160612A: Fermi GBM detection
- GRB 160611A: Swift/UVOT observations
- GRB 160611A: Swift-BAT refined analysis
- Swift Trigger 690738 is not an astrophysical event
- GRB 160611A: Swift-XRT refined Analysis
- GRB160611.9 MASTER-Net OT detection
- GRB 160611A: Swift-XRT observations
- GRB 160611A: Swift detection of a burst
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
- GRB 160525C: Astrosat CZTI detection
- GRB 160508A: Astrosat CZTI detection
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
- GRB 160607A CALET Gamma-Ray Burst Monitor detection
- Swift detection of SWIFT J174540.2-290037
- Swift detection of SWIFT J174540.2-290037
- Trigger 689956: Swift detection of a source near the Galactic center
- GRB 160607A: Swift/UVOT Upper Limits
- GRB 160607A: GROND confirmation of the afterglow
- Konus-Wind observation of GRB 160607A
- GRB 160607A: candidate optical afterglow from the NOT
- GRB 160607A: Swift-BAT refined analysis
- Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
- GRB 160607A: Swift-XRT refined Analysis
- GRB 160607A: Swift detection of a bright burst
- Fermi GBM trigger 486907024/160606498 is not a GRB
- Trigger 689353: Swift detection of a transient near Sgr A*
- GRB 160601A: Discovery Channel Telescope Limits
- GRB 160601A: Swift/UVOT Upper Limits
- GRB 160601A: Swift-BAT refined analysis
- Fermi GBM trigger 486562774/160602514 is not a GRB
- GRB160601A: Gemini Imaging
- GRB 160601A: GTC observations confirming transient source decay
- GRB 160601A: Mondy optical observations, photometry of NOT sources
- GRB 160530B CALET Gamma-Ray Burst Monitor detection
- GRB 160601A: Swift-XRT refined Analysis
- GRB 160601A: MITSuME Okayama Ks-band upper-limit
- GRB 160601A: MASTER-Net observations
- GRB 160601A: Swift detection of a short hard burst
- GRB 160530B: Fermi GBM Detection
- GRB 160525C: CALET Gamma-Ray Burst Monitor detection
- GRB 160525B: Swift-BAT refined analysis
- GRB 160525B: Swift-XRT refined Analysis
- GRB 160525B: Swift/UVOT Detection
- GRB 160525A: Swift-BAT refined analysis
- GRB 160525B: Swift detection of a burst
- GRB 160525A: Swift detection of a probable burst
- Correction - Fermi/GBM trigger 160523919 is a GRB