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"

42306 results found.

  1. GRB 070419A: RAPTOR Detection of Early Emission
  2. GRB 070419B: Swift XRT refined analysis
  3. GRB 070419: Keck/LRIS Absorption Redshift
  4. GRB 070419B: optical afterglow confirmation
  5. GRB 070419A, Optical observations
  6. GRB 070411: Deep VLT detection
  7. GRB070419 - SDSS Pre-Burst Observations
  8. GRB 070419A: SARA observations
  9. GRB 070419A: NAYUTA Optical Observation
  10. GRB 070419A: Faulkes Telescope North Optical Observations
  11. GRB 070419B optical afterglow candidate
  12. GRB 070419A: Optical and IR observations with KANATA
  13. GRB 070419B: optical afterglow candidate
  14. GRB 070419A: Lulin Optical observation
  15. GRB070419A, optical observation
  16. Infrared detection of GRB070419A with UKIRT
  17. GRB 070419A: Kiso Optical observation
  18. GRB070330: Correction to UVOT position
  19. GRB 070419: P60 Confirmation of Optical Afterglow
  20. GRB 070419B: Swift detection of a burst
  21. GRB 070419 optical afterglow candidate
  22. GRB 070419A: ROTSE-III Optical Limits
  23. GRB 070419: Swift detection of a burst
  24. GRB 070418: Optical and IR observations with KANATA
  25. Trigger 276045: Swift detection of a possible burst
  26. GRB 070406: Swift XRT refined analysis
  27. GRB 070318, SMARTS optical/IR afterglow observations
  28. GRB 070411: TLS data shows plateau, flares
  29. GRB070412: UKIRT-WFCAM JHK upper limits
  30. GRB 070412, Swift-BAT refined analysis
  31. GRB 070412 Liverpool Telescope optical limit
  32. GRB 070411: Optical photometry at Crni Vrh
  33. GRB 070412: Swift-XRT refined analysis
  34. GRB 070411: Swift-XRT refined analysis
  35. GRB 070412: Optical observations at Crni Vrh
  36. GRB 070411: OA redshift
  37. GRB 070412: Swift-XRT refined position
  38. GRB 070412: further NOT observations
  39. GRB 070412: Gemini/GMOS afterglow candidate
  40. GRB 070412: IAC80 optical afterglow candidate
  41. GRB 070411: Magellan/Clay photometry
  42. GRB 070411: Magellan/IMACS photometry
  43. GRB 070412: Nearby bright galaxy
  44. GRB 070411, Swift-BAT refined analysis
  45. GRB 070412: Swift detection of a burst
  46. GRB 070411: IAC80 optical observations
  47. GRB 070411 : Liverpool Telescope Observations
  48. GRB 070411: Optical observations at Crni Vrh
  49. GRB 070411: ROTSE-III Detection of Optical Counterpart
  50. GRB 070411: Tautenburg RRM Afterglow Confirmation
  51. GRB 070411: Swift detection of a burst with optical afterglow
  52. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  53. GRB 070406: Swift XRT team further analysis
  54. Suzaku ToO observation of SGR 1806-20
  55. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  56. GRB 070406: Bright galaxy in XRT error circle is a quasar
  57. GRB 070406, Swift-BAT refined analysis
  58. GRB 070406: Correction to the optical candidate in GCN6253
  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: The exprosure time of Xinglong TNT optical Upper Limit
  67. GRB 070406: SARA upper limit
  68. GRB 070406: Xinglong TNT optical Upper Limit
  69. GRB 070406: Swift detection of a burst
  70. GRB 070402: Suzaku WAM observation of the prompt emission
  71. GRB 070311, deep optical photometry
  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. INTEGRAL ToO Observation of SGR1806-20
  76. UVOT observations of GRB070330
  77. GRB 070330, Swift-BAT refined analysis
  78. GRB 070330, SMARTS optical/IR observations
  79. GRB 070330: TAROT La Silla observatory optical observations
  80. GRB 070330: Swift-XRT refined analysis
  81. GRB 070330 - Watcher Observations
  82. GRB 070330: Swift detection of a burst
  83. Konus-Wind observation of GRB 070328
  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. GRB070223: confirmation of nIR and optical afterglow
  92. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  93. GRB 070311, deep optical photometry
  94. Short-Hard GRB 070209: PROMPT Observations
  95. GRB 070318: Gemini + Magellan spectra
  96. GRB 070318: absorption-line redshift
  97. GRB070318: Swift-XRT refined analysis
  98. GRB 070318: Swift/UVOT Continued Observations
  99. GRB 070318, Swift-BAT refined analysis
  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