Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28040 results found.

  1. GRB090305B: MASTER-net prompt optical short burst observations
  2. GRB 090313: MITSuME Okayama observation
  3. GRB 090313: Additional Gemini-S photometry
  4. GRB 090313: TAROT La Silla observatory optical detection
  5. GRB 090313: Zadko Telescope observations
  6. GRB 090313 optical observations
  7. GRB 090313: Ongoing plateau phase
  8. GRB 090313: Swift-XRT refined analysis
  9. GRB 090313: Swift/UVOT upper limits
  10. GRB 090313: Swift-BAT refined analysis
  11. GRB 090313, GROND observations
  12. GRB 090309, Swift-BAT lag analysis
  13. Swift trigger 346250 is probably not a burst
  14. GRB090310: Fermi GBM detection
  15. GRB 090205: Zadko Telescope late-time observations
  16. GRB 090309A: GROND upper limits
  17. GRB 090307A: TAROT Calern observatory optical observations
  18. GRB 090309: Swift/UVOT Upper Limits
  19. GRB090305B: Fermi GBM detection
  20. GRB 090309B: Fermi GBM detection
  21. GRB 090309: Swift-XRT refined analysis
  22. GRB 090309: Enhanced Swift-XRT position
  23. GRB 090309, Swift-BAT refined analysis
  24. GRB 090308: GROND observations
  25. GRB 090308: Gemini GMOS Observations
  26. GRB 090309: Swift detection of a burst
  27. GRB 090308B: Fermi GBM detection
  28. GRB 090308: Swift/UVOT Upper Limits
  29. GRB 090307B: Fermi GBM detection
  30. GRB 090306C: Fermi GBM detection
  31. GRB 090307: GROND Upper Limits
  32. GRB 090306B: GROND Upper Limits
  33. GRB 090308: Swift-XRT refined analysis
  34. Radio observation of GRB 090201 with ATCA
  35. Radio observation of GRB 090117 with ATCA
  36. Radio observation of GRB 081226b with ATCA
  37. Radio observation of GRB 081226a with ATCA
  38. Radio observation of GRB 081007 with ATCA
  39. GRB 090308: Swift-BAT refined analysis
  40. GRB 090308: Swift detection of a burst
  41. GRB 090306B: Possible XRT afterglow
  42. GRB 090307: Swift-XRT afterglow confirmation and analysis
  43. GRB 090307: Swift-BAT refined analysis of trigger 345551
  44. GRB 090306B: Burst detection from Swift-BAT slew data
  45. Swift Trigger 345551 is probably not a GRB
  46. IPN localization of short GRB 090305C
  47. GRB 090306: Swift detection of a possible burst
  48. GRB 090305: Swift/UVOT Upper Limits
  49. GRB 090305: Swift-XRT refined analysis
  50. GRB 090305, Swift-BAT refined analysis
  51. GRB 090227A: Suzaku WAM observation of the prompt emission
  52. GRB090305: GMOS-S Candidate Optical Afterglow
  53. GRB 090305: Swift detection of a short burst
  54. GRB 090303: Fermi GBM detection
  55. GRB 090304: Fermi GBM detection
  56. GRB 090301A: Suzaku WAM observation of the prompt emission
  57. GRB 090228B: Fermi GBM detection
  58. GRB 090301A: Swift-BAT refined analysis
  59. GRB 090301B: Fermi GBM detection
  60. GRB 090227B: Fermi GBM detection
  61. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  62. GRB 090228: Fermi GBM detection
  63. GRB 090227: Fermi GBM detection
  64. GRB 090206: Fermi GBM detection
  65. SGR J1550-5418
  66. GRB 081211B: Nearby cluster
  67. GRB 090222: Fermi GBM detection
  68. GRB 090219: Fermi GBM detection
  69. Swift Trigger 343319 is not a GRB
  70. GRB 090217: Suzaku WAM observation of the prompt emission
  71. GRB090217: XRT analysis
  72. GRB 090213: Fermi GBM detection
  73. GRB 090217: Fermi GBM detection
  74. SGR activity seen by BAT during ICSP Ionospheric Events
  75. GRB 090207 - Fermi GBM Observations
  76. GRB 090129: Fermi GBM detection
  77. VLA radio upper limit on GRB 090205
  78. GRB 090205: Swift/UVOT Upper Limits
  79. GRB 090205: Swift-XRT refined analysis
  80. GRB 090205: GROND observations and photometric redshift estimate
  81. GRB 090205: VLT candidate afterglow
  82. GRB 090205: Swift-BAT refined analysis
  83. GRB 090205: Enhanced Swift-XRT position
  84. GRB 090205: Swift detection of a burst
  85. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  86. GRB 090131: Suzaku WAM observation of the prompt emission
  87. GRB 090202: Fermi GBM detection
  88. GRB 090131: Fermi GBM detection
  89. GRB 090201: Swift-XRT refined analysis
  90. GRB090201: Swift UVOT upper limits
  91. GRB 090201: object inside the enhanced XRT error circle
  92. GRB 090201: Enhanced Swift-XRT position
  93. GRB 090201: VLT NIR observations
  94. GRB 090201: Swift-BAT refined analysis
  95. GRB 090201: VLT afterglow candidate
  96. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  97. GRB090113: MAGIC telescope GeV observation
  98. GRB 090201: ROTSE-III Optical Limits
  99. GRB 090126A: Swift/UVOT Upper Limits
  100. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29

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