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"

24410 results found.

  1. GRB 090618: SARA observations
  2. GRB 090618: AGILE observations
  3. GRB 090617: Fermi GBM detection
  4. GRB 090618 Faulkes Telescope North observations
  5. GRB 090618: ROTSE-III Detection of Optical Counterpart
  6. GRB 090616: Fermi GBM detection
  7. GRB 090612: Fermi GBM detection
  8. GRB 090610C: Fermi GBM detection
  9. GRB 090610B: Fermi GBM detection
  10. GRB 090610: Fermi GBM detection
  11. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  12. GRB 090602: Suzaku WAM observation of the prompt emission
  13. GRB 090531B: Fermi GBM detection
  14. Konus-RF observation of SGR burst 090605A
  15. Discovery of a new soft gamma repeater source, SGR 0418+5729
  16. GRB 090608: Fermi GBM detection
  17. GRB 090606: Fermi GBM detection
  18. GRB 090607: XRT Team Refined Analysis
  19. GRB 090607: Swift-BAT refined analysis of the SHB
  20. GRB 090607: Faulkes Telescope North observations
  21. GRB 090530B: Suzaku WAM observation of the prompt emission
  22. GRB 090602: Fermi GBM detection
  23. GMRT observation of GRB 090424 afterglow
  24. GRB 090528: Suzaku WAM observation of the prompt emission
  25. GRB090529: Further NOT optical observations
  26. GRB 090528B: Suzaku WAM observation of the prompt emission
  27. GRB 090531B: Swift/BAT spectral lag results
  28. GRB 090529C: Fermi GBM detection
  29. GRB 090529B: Fermi GBM detection
  30. GRB 090530B: Fermi GBM detection
  31. Corrections to GRB 090531B Swift/UVOT Upper Limits
  32. GRB 090528B: MASTER-II Kourovka optical limit
  33. GRB 090531B: Swift-BAT refined analysis
  34. GRB 090531B: ROTSE-III Optical Limits
  35. GRB 090531B: Swift detection of a burst
  36. GRB 090531: Swift-BAT refined analysis
  37. GRB 090530: break in light curve
  38. GRB 090531: P60 Observations
  39. GRB 090528B: Fermi GBM detection
  40. GRB 090528: Fermi GBM detection
  41. GRB 090530: Swift-BAT refined analysis
  42. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  43. GRB 090529: TLS Afterglow Observations
  44. GRB 090529: Swift-BAT refined analysis
  45. GRB 090529: Xinglong TNT optical observation
  46. GRB 090520D: Fermi GBM detection
  47. GRB 090520C: Fermi GBM detection
  48. GRB 090520B: Fermi GBM detection
  49. GRB 090522 : Fermi GBM detection
  50. GRB 090524: Fermi GBM detection
  51. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  52. GRB 090513B: Fermi GBM detection
  53. GRB 090518: Fermi GBM detection
  54. GRB 090516C: Fermi GBM detection
  55. GRB 090516: Fermi GBM observation
  56. GRB 090516B: Fermi GBM detection
  57. GRB 090519B: Fermi GBM detection
  58. GRB 090519: GROND observation
  59. GRB 090519, Swift-BAT refined analysis
  60. GRB 090511: Fermi GBM Detection
  61. GRB 090514: Fermi GBM detection
  62. GRB090518: GROND upper limits
  63. GRB 090518, Swift-BAT refined analysis
  64. GRB 090518B: Fermi GBM detection
  65. GRB090513: Fermi GBM detection
  66. GRB 090515: Swift/BAT spectral lag results
  67. GRB 090516: Swift-BAT refined analysis
  68. GRB 090516: GROND OBSERVATIONS
  69. GRB 090516 - Zadko Telescope observations
  70. GRB 090516: Faulkes Telescope South optical afterglow
  71. GRB 090515: Swift-XRT refined analysis
  72. GRB 090509: Fermi GBM observation
  73. GRB 090515: Swift-BAT refined analysis
  74. GRB 090515: PAIRITEL Upper Limits
  75. GRB 090515: ROTSE-III Optical Limits
  76. GRB090510: VLT/FORS2 spectroscopic redshift
  77. GRB 090510: GROND observations
  78. GRB 090509, further Swift-BAT refined analysis
  79. GRB 090510B: Fermi GBM detection
  80. GRB 090502: Fermi GBM detection
  81. GRB 090510: Swift-BAT refined analysis
  82. GRB 090509: Swift-BAT refined analysis
  83. Fermi LAT detection of GRB 090510
  84. GRB 090509, SMARTS optical/IR afterglow observations
  85. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  86. GRB 090323: optical observations
  87. GRB 090427: GROND observations
  88. GRB 090429A: ROVOR magnitude limit
  89. GRB 090428B: Suzaku WAM observation of the prompt emission
  90. GRB 090424, SMARTS optical/IR afterglow monitoring
  91. GRB 090429D: Fermi GBM detection
  92. GRB 090429C: Fermi GBM detection
  93. GRB 090424: YNAO-GMG observations
  94. GRB 090429A: GROND upper limits
  95. GRB 090427C: Fermi GBM detection
  96. GRB 090427B: Fermi GBM detection
  97. GRB 090426C: Fermi GBM detection
  98. GRB 090426B: Fermi GBM detection/observation
  99. Konus-Wind observation of very bright GRB 090427
  100. GRB 090428B: Fermi GBM detection

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