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"

36366 results found.

  1. GRB 081120: Fermi GBM detection
  2. GRB 081118: Fermi GBM detection.
  3. GRB 081122: Fermi GBM detection
  4. Konus-Wind observation of GRB 081121
  5. GRB 081121, SMARTS optical/IR afterglow observations
  6. GRB081121: Fermi GBM detection
  7. Fermi GBM detection of a weak source
  8. GRB081121: Refined Swift/UVOT observations
  9. GRB 081121: Swift-XRT refined analysis
  10. GRB 081121: Magellan Redshift
  11. GRB 081121: Enhanced Swift-XRT position
  12. GRB 081121: GROND observations
  13. GRB 081121: Swift-BAT refined analysis
  14. GRB 081121: Swift detection of a burst
  15. GRB 081121: ROTSE-III Detection of Optical Counterpart
  16. GRB 081016b, SMARTS optical/IR observations
  17. GRB 081119: Fermi GBM detection
  18. VLA Radio upper limit on GRB 081118
  19. GRB 081118: VLT redshift
  20. GRB 081118: Swift-XRT refined analysis
  21. GRB 081118: GROND detection of afterglow
  22. GRB 081118: optical afterglow candidate
  23. GRB 081118: Swift UVOT Upper Limits
  24. GRB 081118: Swift-BAT refined analysis
  25. GRB 081118: Enhanced Swift-XRT position
  26. GRB 081118: Swift detection of a burst
  27. GRB 081109A: confirmation of possible detection host galaxy
  28. Further Swift-XRT observations of the probable GRB 081105.
  29. GRB 081113: Fermi GBM detection
  30. GRB 081102: RTT150 Optical observations
  31. GRB 081110: Fermi GBM detection
  32. GRB 081110: MASTER: first optical observations Fermi GRB
  33. GRB 081109: TAROT La Silla observatory optical observations
  34. GRB 081102: MASTER refind and final results
  35. GRB 081109: GROND redshift limit and host extinction
  36. GRB 081025: Swift-XRT further analysis
  37. GRB 081024B: Swift-XRT late-time observations
  38. Swift-BAT refined analysis of trigger 334129
  39. GRB 081109B: Swift/UVOT refined analysis
  40. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  41. GRB 081109A: Possible Swift-UVOT detection
  42. GRB 081109A: Faulkes Telescope South observations
  43. GRB 081109A, Swift-BAT refined analysis
  44. GRB 081109A: Swift-XRT refined analysis
  45. GRB 081109: Fermi GBM detection
  46. GRB 081109: Swift/UVOT upper limits
  47. GRB 081109A optical upper limit
  48. GRB 081109: REM NIR afterglow detection
  49. GRB 081109: Swift detection of a burst
  50. GRB 081028 - PAIRITEL NIR detection
  51. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  52. GRB 081102B: Fermi GBM detection
  53. GRB 081105B: Fermi GBM detection
  54. GRB 081107: Fermi GBM detection
  55. GRB 081104: GROND found no Optical/NIR Afterglow
  56. GRB 081105: GROND Upper Limits
  57. Radio observation of GRB 080523 with ATCA
  58. Radio observation of GRB 080520 with ATCA
  59. GRB 081105: Observations from OSN
  60. UVOT/Swift observations of GRB081105
  61. Swift-XRT observations of GRB 081105
  62. GRB 081101B: Fermi GBM detection
  63. Radio observation of GRB 080516 with ATCA
  64. GRB 081105 Swift/BAT and IPN Localization
  65. GRB 081025: Fermi GBM observation
  66. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  67. GRB 081104: refined XRT analysis
  68. GRB 081104: Enhanced Swift-XRT position
  69. GRB 081104: Swift-BAT refined analysis
  70. GRB081104: Swift/UVOT Upper Limits
  71. Fermi Detection of GRB 081102
  72. GRB 081104 : Faulkes Telescope South observations
  73. GRB 081104: Swift-XRT position
  74. GRB 081104: Swift detection of a burst
  75. Radio observation of GRB 080130 with ATCA
  76. GRB 081102: MASTER prompt optical limit
  77. GRB 081102: Swift-XRT refined analysis
  78. GRB 081102: Swift/UVOT refined analysis
  79. GRB 081102: Swift-BAT refined analysis
  80. GRB 081102: Enhanced Swift-XRT position
  81. Radio observation of GRB 080218b with ATCA
  82. Radio observation of GRB 080229a with ATCA
  83. GRB 081102: MASTER VWF promt observation
  84. GRB 081102: OPTIMA-Burst optical upper limit
  85. GRB 081102: Swift detection of a burst
  86. SGR 0501+4516: optical observations in August
  87. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  88. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  89. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  90. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  91. GRB 081024B: BTA deep optical observations
  92. GRB 081028: CrAO optical observations
  93. GRB 081024B: new Swift-XRT observations
  94. Radio observation of GRB 080229b with ATCA
  95. GRB 081029, SMARTS optical/IR afterglow observations
  96. GRB 081024B: VLA radio observation
  97. GRB 081029: UVOT Detection of the Optical Afterglow
  98. GRB 081029: PROMPT Detections
  99. GRB 081029: Redshift Confirmation from Gemini-South
  100. GRB 081029: Swift-BAT refined analysis

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