Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

36333 results found.

  1. GRB 070419A: SARA observations
  2. GRB 070419A: NAYUTA Optical Observation
  3. GRB 070419A: Faulkes Telescope North Optical Observations
  4. GRB 070419B optical afterglow candidate
  5. GRB 070419A: Optical and IR observations with KANATA
  6. GRB 070419B: optical afterglow candidate
  7. GRB 070419A: Lulin Optical observation
  8. Infrared detection of GRB070419A with UKIRT
  9. GRB 070419A: Kiso Optical observation
  10. GRB070330: Correction to UVOT position
  11. GRB 070419: P60 Confirmation of Optical Afterglow
  12. GRB 070419B: Swift detection of a burst
  13. GRB 070419 optical afterglow candidate
  14. GRB 070419A: ROTSE-III Optical Limits
  15. GRB 070419: Swift detection of a burst
  16. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  17. GRB 070418: Optical and IR observations with KANATA
  18. Trigger 276045: Swift detection of a possible burst
  19. GRB 070406: Swift XRT refined analysis
  20. IBAS Alert n.4202: not a real GRB
  21. GRB 070318, SMARTS optical/IR afterglow observations
  22. GRB 070411: TLS data shows plateau, flares
  23. GRB070412: UKIRT-WFCAM JHK upper limits
  24. GRB070412: Swift UVOT observations
  25. IBAS Alert n.4199: Not a GRB
  26. GRB 070411: Swift/UVOT observations
  27. GRB 070412, Swift-BAT refined analysis
  28. GRB 070412 Liverpool Telescope optical limit
  29. GRB 070411: Optical photometry at Crni Vrh
  30. GRB 070412: Swift-XRT refined analysis
  31. GRB 070411: Swift-XRT refined analysis
  32. GRB 070412: further reanalysis of NOT images
  33. GRB 070412: Optical observations at Crni Vrh
  34. GRB 070411: OA redshift
  35. GRB 070412: Swift-XRT refined position
  36. GRB 070412: further NOT observations
  37. GRB 070412: Gemini/GMOS afterglow candidate
  38. GRB 070412: IAC80 optical afterglow candidate
  39. GRB 070411: Magellan/Clay photometry
  40. GRB 070411: Magellan/IMACS photometry
  41. GRB 070412: NOT observations
  42. GRB 070412: Nearby bright galaxy
  43. GRB 070411, Swift-BAT refined analysis
  44. GRB 070412: Swift detection of a burst
  45. GRB 070411: IAC80 optical observations
  46. GRB 070411 : Liverpool Telescope Observations
  47. GRB 070411: Optical observations at Crni Vrh
  48. GRB 070411: ROTSE-III Detection of Optical Counterpart
  49. GRB 070411: Tautenburg RRM Afterglow Confirmation
  50. GRB 070411: Swift detection of a burst with optical afterglow
  51. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  52. GRB 070406: Swift XRT team further analysis
  53. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  54. GRB 070406: Bright galaxy in XRT error circle is a quasar
  55. GRB 070406, Swift-BAT refined analysis
  56. GRB 070406: Correction to the optical candidate in GCN6253
  57. GRB 070406: Gemini South Imaging and XRT analysis
  58. GRB070406: Swift UVOT observations
  59. GRB 070406: further analysis of NOT images.
  60. Short GRB 070406 - Possible Bright Host Galaxy
  61. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  62. GRB 070406: NOT observations
  63. GRB 070406: Optical candidate
  64. GRB 070406: The exprosure time of Xinglong TNT optical Upper Limit
  65. GRB 070406: SARA upper limit
  66. GRB 070406: Xinglong TNT optical Upper Limit
  67. GRB 070406: photo-z of a bright galaxy in BAT error circle
  68. GRB 070406: Swift detection of a burst
  69. GRB 070402: Suzaku WAM observation of the prompt emission
  70. GRB 070311, deep optical photometry
  71. GRB 070402: pseudo-z~3.36 from spectral parameters of the prompt
  72. Konus-Wind and Konus-A observations of GRB 070402
  73. IPN triangulation of GRB070402
  74. GRB 070328: Suzaku WAM observation of the prompt emission
  75. GRB 070330, Swift-BAT refined analysis
  76. GRB 070330, SMARTS optical/IR observations
  77. GRB 070330: TAROT La Silla observatory optical observations
  78. GRB 070330: Swift-XRT refined analysis
  79. GRB 070330 - Watcher Observations
  80. GRB 070330: Swift detection of a burst
  81. GRB 070328: pseudo-z~2.75 from spectral parameters of the prompt
  82. Konus-Wind observation of GRB 070328
  83. GRB 070328: Swift/UVOT Upper Limits
  84. long burst from SGR 1806-20 detected on March 26
  85. GRB 070328: Swift/XRT Refined Analysis
  86. GRB 070328 : Suzaku ToO follow up starts
  87. GRB 070328, Swift-BAT refined analysis
  88. GRB 070328: Swift detection of a burst
  89. GRB070220: optical observations
  90. GRB070208: optical observations
  91. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  92. GRB 070311, deep optical photometry
  93. Short-Hard GRB 070209: PROMPT Observations
  94. GRB 070318: Gemini + Magellan spectra
  95. GRB 070318: absorption-line redshift
  96. GRB070318: Swift-XRT refined analysis
  97. GRB 070318: Swift/UVOT Continued Observations
  98. GRB 070318, Swift-BAT refined analysis
  99. IBAS Alert n. 4176: not a GRB
  100. GRB 070318: Swift detection of a burst with an optical afterglow

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