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"

26310 results found.

  1. GRB 090324: Suzaku WAM observation of the prompt emission
  2. GRB 090328: Radio afterglow detection
  3. GRB 090326: Fermi GBM detection
  4. GRB 090328: BOOTES-3 optical observations
  5. GRB 090328: Fermi GBM Spectral Analysis
  6. GRB 090328B: Fermi GBM Detection
  7. GRB 090330: Fermi GBM detection
  8. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  9. GRB090323: Optical observations from NOT
  10. Konus-Wind observation of GRB 090328
  11. GRB 090328: Updated position/optical afterglow candidate
  12. GRB 090323: Radio afterglow detection
  13. GRB 090323: Additional Lick observations
  14. GRB 090327: Fermi GBM detection
  15. GRB 090320B: MASTER-Net prompt optical observations
  16. GRB 090323: RTT150 optical observations
  17. GRB 090323: Fermi GBM Spectral Analysis
  18. GRB 090323: UVOT Detection of Afterglow
  19. GRB 090323: Swift-XRT refined analysis
  20. Konus-Wind observation of GRB 090323
  21. GRB 090323: P60 Afterglow Confirmation
  22. GRB 090323: GROND Detection of the Afterglow and Photo-z
  23. SGR J1550-5418: two Fermi GBM triggers on March 22
  24. GRB 090323: Possible XRT Counterpart
  25. GRB 090320B: Fermi GBM detection.
  26. GRB 090319: Fermi GBM detection
  27. X-shooter observations of GRB 090313
  28. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  29. GRB 090315: Suzaku WAM observation of the prompt emission
  30. GRB 090313: VLT spectroscopy
  31. GRB090313: radio detection with the VLA
  32. Konus-Wind observation of GRB 090315
  33. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  34. GRB 090313, SMARTS optical/IR observations
  35. Further Swift/UVOT observations of GRB 090313
  36. GRB 090313: detection with CARMA in 3mm band
  37. GRB090305B: MASTER-net prompt optical short burst observations
  38. GRB 090313: Additional Gemini-S photometry
  39. GRB 090313: Light curve steepening
  40. GRB 090313: TAROT La Silla observatory optical detection
  41. GRB 090313: Gemini-S photometry
  42. GRB 090313 optical observations
  43. GRB 090313: Ongoing plateau phase
  44. GRB 090313: Swift-XRT refined analysis
  45. GRB 090313: Swift/UVOT upper limits
  46. GRB 090313: Faulkes Telescope North observations
  47. GRB 090306B: Confirmation of the X-ray afterglow
  48. GRB 090313: Swift-BAT refined analysis
  49. GRB 090313: SDSS object underlying the optical afterglow position
  50. GRB 090313, GROND observations
  51. GRB 090313: Swift detection of a burst
  52. GRB 090313: Swift detection of a burst
  53. GRB090310: Fermi GBM detection
  54. GRB 090205: Zadko Telescope late-time observations
  55. GRB 090307A: TAROT Calern observatory optical observations
  56. GRB090305B: Fermi GBM detection
  57. GRB 090309B: Fermi GBM detection
  58. GRB 090309: Swift-XRT refined analysis
  59. GRB 090309: Enhanced Swift-XRT position
  60. GRB 090306B: INTEGRAL SPI-ACS light curve
  61. GRB 090309, Swift-BAT refined analysis
  62. GRB 090308: GROND observations
  63. GRB 090308: Gemini GMOS Observations
  64. GRB 090309: Swift detection of a burst
  65. GRB 090308B: Fermi GBM detection
  66. GRB 090307B: Fermi GBM detection
  67. GRB 090306C: Fermi GBM detection
  68. GRB 090307: GROND Upper Limits
  69. GRB 090306B: GROND Upper Limits
  70. GRB 090305C: Suzaku WAM observation of the prompt emission
  71. GRB 090308: Swift-XRT refined analysis
  72. Radio observation of GRB 090201 with ATCA
  73. Radio observation of GRB 090117 with ATCA
  74. Radio observation of GRB 081226b with ATCA
  75. Radio observation of GRB 081226a with ATCA
  76. Radio observation of GRB 081007 with ATCA
  77. ATCA observation of SGR J1550-5418
  78. GRB 090308: Swift-BAT refined analysis
  79. GRB 090308: Swift detection of a burst
  80. GRB 090307: Swift-XRT afterglow confirmation and analysis
  81. GRB 090307: Swift-BAT refined analysis of trigger 345551
  82. GRB 090306B: Burst detection from Swift-BAT slew data
  83. Swift Trigger 345551 is probably not a GRB
  84. Fermi GBM trigger 090305784 is not a GRB
  85. GRB 090306: Swift detection of a possible burst
  86. GRB 090305: Swift/UVOT Upper Limits
  87. GRB 090305: Swift-XRT refined analysis
  88. GRB 090305, Swift-BAT refined analysis
  89. GRB 090227A: Suzaku WAM observation of the prompt emission
  90. GRB 090305: Magellan confirmation of the optical afterglow
  91. GRB090305: GMOS-S Candidate Optical Afterglow
  92. GRB 090305: Swift detection of a short burst
  93. GRB 090304: Fermi GBM detection
  94. GRB 090301A: Suzaku WAM observation of the prompt emission
  95. Konus-RF catches first GRB and SGR bursts
  96. GRB 090228B: Fermi GBM detection
  97. Konus-Wind observation of bright short GRB 090227B
  98. IPN localization of short bright GRB 090227B
  99. Konus-Wind observation of GRB 090301A
  100. GRB 090301A: 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