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"

36368 results found.

  1. GRB 090309, Swift-BAT lag analysis
  2. GRB 090313: Swift detection of a burst
  3. GRB 090313: Swift detection of a burst
  4. GRB 090313 OA candidate
  5. Swift trigger 346250 is probably not a burst
  6. GRB090310: Fermi GBM detection
  7. GRB 090205: Zadko Telescope late-time observations
  8. GRB 090309A: GROND upper limits
  9. GRB 090307A: TAROT Calern observatory optical observations
  10. GRB 090309: Swift/UVOT Upper Limits
  11. GRB090305B: Fermi GBM detection
  12. GRB 090309B: Fermi GBM detection
  13. GRB 090309: Swift-XRT refined analysis
  14. GRB 090309: Enhanced Swift-XRT position
  15. GRB 090306B: INTEGRAL SPI-ACS light curve
  16. GRB 090309, Swift-BAT refined analysis
  17. GRB 090308: GROND observations
  18. GRB 090308: Gemini GMOS Observations
  19. GRB 090309: Swift detection of a burst
  20. GRB 090308B: Fermi GBM detection
  21. GRB 090308: Swift/UVOT Upper Limits
  22. GRB 090307B: Fermi GBM detection
  23. GRB 090306C: Fermi GBM detection
  24. GRB 090307: GROND Upper Limits
  25. GRB 090306B: GROND Upper Limits
  26. GRB 090305C: Suzaku WAM observation of the prompt emission
  27. GRB 090308: Swift-XRT refined analysis
  28. Radio observation of GRB 090201 with ATCA
  29. Radio observation of GRB 090117 with ATCA
  30. Radio observation of GRB 081226b with ATCA
  31. Radio observation of GRB 081226a with ATCA
  32. Radio observation of GRB 081007 with ATCA
  33. GRB 090308: Swift-BAT refined analysis
  34. GRB 090308: Swift detection of a burst
  35. GRB 090306B: Possible XRT afterglow
  36. GRB 090307: Swift-XRT afterglow confirmation and analysis
  37. GRB 090307: Swift-BAT refined analysis of trigger 345551
  38. GRB 090306B: Burst detection from Swift-BAT slew data
  39. Swift Trigger 345551 is probably not a GRB
  40. Swift-BAT trigger 345396 is not a GRB
  41. IPN localization of short GRB 090305C
  42. Fermi GBM trigger 090305784 is not a GRB
  43. GRB 090306: Swift detection of a possible burst
  44. GRB 090305: Swift/UVOT Upper Limits
  45. GRB 090305: Swift-XRT refined analysis
  46. GRB 090305, Swift-BAT refined analysis
  47. GRB 090227A: Suzaku WAM observation of the prompt emission
  48. GRB 090305: Magellan confirmation of the optical afterglow
  49. GRB090305: GMOS-S Candidate Optical Afterglow
  50. GRB 090305: Swift detection of a short burst
  51. GRB 090303: Fermi GBM detection
  52. GRB 090304: Fermi GBM detection
  53. GRB 090301A: Suzaku WAM observation of the prompt emission
  54. Konus-RF catches first GRB and SGR bursts
  55. GRB 090228B: Fermi GBM detection
  56. Konus-Wind observation of bright short GRB 090227B
  57. IPN localization of short bright GRB 090227B
  58. Konus-Wind observation of GRB 090301A
  59. GRB 090301A: Swift-BAT refined analysis
  60. GRB 090301B: Fermi GBM detection
  61. GRB 090227B: Fermi GBM detection
  62. GRB 090301: Swift detection of a burst
  63. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  64. GRB 090228: Fermi GBM detection
  65. GRB 090227: Fermi GBM detection
  66. GRB 090206: Fermi GBM detection
  67. GRB 081211B: Nearby cluster
  68. GRB 090222: Fermi GBM detection
  69. GRB 090219: Fermi GBM detection
  70. Swift Trigger 343319 is not a GRB
  71. GRB 090217: Suzaku WAM observation of the prompt emission
  72. GRB090217: XRT analysis
  73. Konus-Wind observation of GRB 090217
  74. IPN localization of GRB 090217
  75. GRB 090213: Fermi GBM detection
  76. GRB090217: Fermi-LAT Detection
  77. GRB 090217: Fermi GBM detection
  78. GRB 090207 - Fermi GBM Observations
  79. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  80. GRB 090129: Fermi GBM detection
  81. VLA radio upper limit on GRB 090205
  82. GRB 090205: VLT optical decay
  83. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  84. GRB 090205: Swift/UVOT Upper Limits
  85. GRB 090205: VLT refined redshift
  86. GRB 090205: Swift-XRT refined analysis
  87. GRB 090205: Swift burst of interest
  88. GRB 090205: VLT spectroscopic redshift
  89. GRB 090205: GROND observations and photometric redshift estimate
  90. GRB 090205: VLT candidate afterglow
  91. GRB 090205: Swift-BAT refined analysis
  92. GRB 090205: Enhanced Swift-XRT position
  93. GRB 090205: Swift detection of a burst
  94. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  95. GRB 090131: Suzaku WAM observation of the prompt emission
  96. GRB 090126A: Swift-XRT afterglow confirmation
  97. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  98. Konus-Wind observation of GRB 090201
  99. GRB 090202: Fermi GBM detection
  100. GRB 090131: 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