Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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').
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"

32775 results found.

  1. GRB070420: Swift UVOT continuing observations
  2. GRB 070411: BART early limit
  3. GRB 070420: Faulkes Telescope South Observations
  4. GBR 070419A: Swift/XRT refined analysis
  5. GRB 070420: NIR and optical afterglow confirmed
  6. GRB 070419A: MITSuME Okayama Observations
  7. GRB 070419A: Early Super-LOTIS Observations
  8. GRB 070419B, Swift-BAT refined analysis
  9. GRB 070419A Swift-BAT Refined Analysis
  10. GRB070419B: Confirmation of Optical Transient
  11. GRB 070419A: RAPTOR Detection of Early Emission
  12. GRB 070419B: Swift XRT refined analysis
  13. GRB 070419: Keck/LRIS Absorption Redshift
  14. GRB 070419A, Optical observations
  15. GRB 070411: Deep VLT detection
  16. GRB 070419A: SARA observations
  17. GRB 070419A: NAYUTA Optical Observation
  18. GRB 070419A: Faulkes Telescope North Optical Observations
  19. GRB 070419B optical afterglow candidate
  20. GRB 070419A: Optical and IR observations with KANATA
  21. GRB 070419B: optical afterglow candidate
  22. GRB070419A, optical observation
  23. Infrared detection of GRB070419A with UKIRT
  24. GRB070330: Correction to UVOT position
  25. GRB 070419: P60 Confirmation of Optical Afterglow
  26. GRB 070419 optical afterglow candidate
  27. GRB 070419A: ROTSE-III Optical Limits
  28. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  29. GRB 070418: Optical and IR observations with KANATA
  30. GRB 070406: Swift XRT refined analysis
  31. GRB 070318, SMARTS optical/IR afterglow observations
  32. GRB 070411: TLS data shows plateau, flares
  33. GRB070412: Swift UVOT observations
  34. GRB 070411: Swift/UVOT observations
  35. GRB 070412, Swift-BAT refined analysis
  36. GRB 070412 Liverpool Telescope optical limit
  37. GRB 070411: Optical photometry at Crni Vrh
  38. GRB 070412: Swift-XRT refined analysis
  39. GRB 070411: Swift-XRT refined analysis
  40. GRB 070412: further reanalysis of NOT images
  41. GRB 070412: Optical observations at Crni Vrh
  42. GRB 070411: OA redshift
  43. GRB 070412: Swift-XRT refined position
  44. GRB 070412: further NOT observations
  45. GRB 070412: Gemini/GMOS afterglow candidate
  46. GRB 070412: IAC80 optical afterglow candidate
  47. GRB 070412: NOT observations
  48. GRB 070412: Nearby bright galaxy
  49. GRB 070411, Swift-BAT refined analysis
  50. GRB 070411 : Liverpool Telescope Observations
  51. GRB 070411: Optical observations at Crni Vrh
  52. GRB 070411: ROTSE-III Detection of Optical Counterpart
  53. GRB 070411: Tautenburg RRM Afterglow Confirmation
  54. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  55. GRB 070406: Swift XRT team further analysis
  56. Suzaku ToO observation of SGR 1806-20
  57. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  58. GRB 070406, Swift-BAT refined analysis
  59. GRB 070406: Gemini South Imaging and XRT analysis
  60. GRB070406: Swift UVOT observations
  61. GRB 070406: further analysis of NOT images.
  62. Short GRB 070406 - Possible Bright Host Galaxy
  63. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  64. GRB 070406: NOT observations
  65. GRB 070406: Optical candidate
  66. GRB 070406: photo-z of a bright galaxy in BAT error circle
  67. GRB 070402: Suzaku WAM observation of the prompt emission
  68. GRB 070311, deep optical photometry
  69. Konus-Wind and Konus-A observations of GRB 070402
  70. IPN triangulation of GRB070402 - correction
  71. GRB 070328: Suzaku WAM observation of the prompt emission
  72. INTEGRAL ToO Observation of SGR1806-20
  73. UVOT observations of GRB070330
  74. GRB 070330, Swift-BAT refined analysis
  75. GRB 070330, SMARTS optical/IR observations
  76. GRB 070330: Swift-XRT refined analysis
  77. GRB 070330 - Watcher Observations
  78. Konus-Wind observation of GRB 070328
  79. GRB 070328: Swift/UVOT Upper Limits
  80. long burst from SGR 1806-20 detected on March 26
  81. GRB 070328: Swift/XRT Refined Analysis
  82. GRB 070328 : Suzaku ToO follow up starts
  83. GRB 070328, Swift-BAT refined analysis
  84. GRB070220: optical observations
  85. GRB070208: optical observations
  86. GRB070223: confirmation of nIR and optical afterglow
  87. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  88. GRB 070311, deep optical photometry
  89. Short-Hard GRB 070209: PROMPT Observations
  90. GRB 070318: Gemini + Magellan spectra
  91. GRB 070318: absorption-line redshift
  92. GRB070318: Swift UVOT continuing observations
  93. GRB070318: Swift-XRT refined analysis
  94. GRB 070318: Swift/UVOT Continued Observations
  95. GRB 070318, Swift-BAT refined analysis
  96. GRB 070311: Late Central Engine Activity Optical Flare??
  97. GRB 070311: MDM Optical Monitoring
  98. VLA observation of GRB 070311
  99. GRB 070311: Tautenburg sees afterglow fading
  100. GRB 070311: Optical observation.

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov