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"

42290 results found.

  1. GRB 070419A: Kiso Optical observation
  2. GRB070330: Correction to UVOT position
  3. GRB 070419: P60 Confirmation of Optical Afterglow
  4. GRB 070419B: Swift detection of a burst
  5. GRB 070419 optical afterglow candidate
  6. GRB 070419A: ROTSE-III Optical Limits
  7. GRB 070419: Swift detection of a burst
  8. GRB 070418: Optical and IR observations with KANATA
  9. Trigger 276045: Swift detection of a possible burst
  10. GRB 070406: Swift XRT refined analysis
  11. GRB 070318, SMARTS optical/IR afterglow observations
  12. GRB 070411: TLS data shows plateau, flares
  13. GRB070412: UKIRT-WFCAM JHK upper limits
  14. GRB 070412, Swift-BAT refined analysis
  15. GRB 070412 Liverpool Telescope optical limit
  16. GRB 070411: Optical photometry at Crni Vrh
  17. GRB 070412: Swift-XRT refined analysis
  18. GRB 070411: Swift-XRT refined analysis
  19. GRB 070412: Optical observations at Crni Vrh
  20. GRB 070411: OA redshift
  21. GRB 070412: Swift-XRT refined position
  22. GRB 070412: further NOT observations
  23. GRB 070412: Gemini/GMOS afterglow candidate
  24. GRB 070412: IAC80 optical afterglow candidate
  25. GRB 070411: Magellan/Clay photometry
  26. GRB 070411: Magellan/IMACS photometry
  27. GRB 070412: Nearby bright galaxy
  28. GRB 070411, Swift-BAT refined analysis
  29. GRB 070412: Swift detection of a burst
  30. GRB 070411: IAC80 optical observations
  31. GRB 070411 : Liverpool Telescope Observations
  32. GRB 070411: Optical observations at Crni Vrh
  33. GRB 070411: ROTSE-III Detection of Optical Counterpart
  34. GRB 070411: Tautenburg RRM Afterglow Confirmation
  35. GRB 070411: Swift detection of a burst with optical afterglow
  36. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  37. GRB 070406: Swift XRT team further analysis
  38. Suzaku ToO observation of SGR 1806-20
  39. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  40. GRB 070406: Bright galaxy in XRT error circle is a quasar
  41. GRB 070406, Swift-BAT refined analysis
  42. GRB 070406: Correction to the optical candidate in GCN6253
  43. GRB 070406: Gemini South Imaging and XRT analysis
  44. GRB070406: Swift UVOT observations
  45. GRB 070406: further analysis of NOT images.
  46. Short GRB 070406 - Possible Bright Host Galaxy
  47. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  48. GRB 070406: NOT observations
  49. GRB 070406: Optical candidate
  50. GRB 070406: The exprosure time of Xinglong TNT optical Upper Limit
  51. GRB 070406: SARA upper limit
  52. GRB 070406: Xinglong TNT optical Upper Limit
  53. GRB 070406: Swift detection of a burst
  54. GRB 070402: Suzaku WAM observation of the prompt emission
  55. GRB 070311, deep optical photometry
  56. Konus-Wind and Konus-A observations of GRB 070402
  57. IPN triangulation of GRB070402
  58. GRB 070328: Suzaku WAM observation of the prompt emission
  59. INTEGRAL ToO Observation of SGR1806-20
  60. UVOT observations of GRB070330
  61. GRB 070330, Swift-BAT refined analysis
  62. GRB 070330, SMARTS optical/IR observations
  63. GRB 070330: TAROT La Silla observatory optical observations
  64. GRB 070330: Swift-XRT refined analysis
  65. GRB 070330 - Watcher Observations
  66. GRB 070330: Swift detection of a burst
  67. Konus-Wind observation of GRB 070328
  68. long burst from SGR 1806-20 detected on March 26
  69. GRB 070328: Swift/XRT Refined Analysis
  70. GRB 070328 : Suzaku ToO follow up starts
  71. GRB 070328, Swift-BAT refined analysis
  72. GRB 070328: Swift detection of a burst
  73. GRB070220: optical observations
  74. GRB070208: optical observations
  75. GRB070223: confirmation of nIR and optical afterglow
  76. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  77. GRB 070311, deep optical photometry
  78. Short-Hard GRB 070209: PROMPT Observations
  79. GRB 070318: Gemini + Magellan spectra
  80. GRB 070318: absorption-line redshift
  81. GRB070318: Swift-XRT refined analysis
  82. GRB 070318: Swift/UVOT Continued Observations
  83. GRB 070318, Swift-BAT refined analysis
  84. GRB 070318: Swift detection of a burst with an optical afterglow
  85. GRB 070311: Late Central Engine Activity Optical Flare??
  86. GRB 070311: MDM Optical Monitoring
  87. GRB 070311: Tautenburg sees afterglow fading
  88. GRB 070311: Optical observation.
  89. GRB 070311: Optical Brightening
  90. GRB 070306: possible emission-line redshift
  91. GRB 070309: variability of the XRT afterglow candidate
  92. GRB 070311: MDM Optical Follow-up
  93. GRB 070311: RAPTOR Detection of Optical Emission
  94. GRB 070311: P60 Observations
  95. GRB 070311: MDM Optical Detection
  96. GRB 070311: MITSuME Okayama Optical Observation
  97. GRB 070311: Swift-XRT refined analysis
  98. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  99. GRB 070311: REM candidate afterglow
  100. GRB 070311: a long GRB detected by INTEGRAL

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