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"

27924 results found.

  1. GRB 090313: Zadko Telescope observations
  2. GRB 090313 - PAIRITEL NIR detections
  3. GRB 090313 optical observations
  4. GRB 090313: Swift-XRT refined analysis
  5. GRB 090313: Swift/UVOT upper limits
  6. GRB 090313: Faulkes Telescope North observations
  7. GRB 090306B: Confirmation of the X-ray afterglow
  8. GRB 090313: Swift-BAT refined analysis
  9. GRB 090313, GROND observations
  10. GRB 090309, Swift-BAT lag analysis
  11. GRB 090313: Swift detection of a burst
  12. GRB 090313: Swift detection of a burst
  13. Swift trigger 346250 is probably not a burst
  14. GRB090310: Fermi GBM detection
  15. GRB 090309A: GROND upper limits
  16. GRB 090307A: TAROT Calern observatory optical observations
  17. GRB 090309: Swift/UVOT Upper Limits
  18. GRB090305B: Fermi GBM detection
  19. GRB 090309B: Fermi GBM detection
  20. GRB 090309: Swift-XRT refined analysis
  21. GRB 090309: Enhanced Swift-XRT position
  22. GRB 090306B: INTEGRAL SPI-ACS light curve
  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 090305C: Suzaku WAM observation of the prompt emission
  34. GRB 090308: Swift-XRT refined analysis
  35. Radio observation of GRB 081007 with ATCA
  36. ATCA observation of SGR J1550-5418
  37. GRB 090308: Swift-BAT refined analysis
  38. GRB 090308: Swift detection of a burst
  39. GRB 090306B: Possible XRT afterglow
  40. GRB 090307: Swift-XRT afterglow confirmation and analysis
  41. GRB 090307: Swift-BAT refined analysis of trigger 345551
  42. GRB 090306B: Burst detection from Swift-BAT slew data
  43. Swift Trigger 345551 is probably not a GRB
  44. Swift-BAT trigger 345396 is not a GRB
  45. IPN localization of short GRB 090305C
  46. GRB 090306: Swift detection of a possible burst
  47. GRB 090305: Swift/UVOT Upper Limits
  48. GRB 090305: Swift-XRT refined analysis
  49. GRB 090305, Swift-BAT refined analysis
  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. GRB 090228B: Fermi GBM detection
  55. Konus-Wind observation of GRB 090301A
  56. GRB 090301A: Swift-BAT refined analysis
  57. GRB 090301B: Fermi GBM detection
  58. GRB 090227B: Fermi GBM detection
  59. GRB 090301: Swift detection of a burst
  60. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  61. GRB 090228: Fermi GBM detection
  62. GRB 090227: Fermi GBM detection
  63. GRB 090206: Fermi GBM detection
  64. SGR J1550-5418
  65. GRB 081211B: Nearby cluster
  66. GRB 090222: Fermi GBM detection
  67. GRB 090219: Fermi GBM detection
  68. Swift Restored
  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. GRB090217: Fermi-LAT Detection
  74. GRB 090217: Fermi GBM detection
  75. SGR activity seen by BAT during ICSP Ionospheric Events
  76. GRB 090129: Fermi GBM detection
  77. GRB 090205: Swift/UVOT Upper Limits
  78. GRB 090205: Swift-XRT refined analysis
  79. GRB 090205: Swift burst of interest
  80. GRB 090205: GROND observations and photometric redshift estimate
  81. GRB 090205: Swift-BAT refined analysis
  82. GRB 090205: Enhanced Swift-XRT position
  83. GRB 090205: Swift detection of a burst
  84. GRB 090126A: Swift-XRT afterglow confirmation
  85. Konus-Wind observation of GRB 090201
  86. GRB 090202: Fermi GBM detection
  87. GRB 090131: Fermi GBM detection
  88. GRB 090201: Swift-XRT refined analysis
  89. GRB090201: Swift UVOT upper limits
  90. GRB 090201: Enhanced Swift-XRT position
  91. GRB 090201: VLT NIR observations
  92. GRB 090201: Swift-BAT refined analysis
  93. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  94. GRB 090201: ROTSE-III Optical Limits
  95. GRB 090201: Swift detection of a burst
  96. GRB 090126A: Swift/UVOT Upper Limits
  97. GRB 090129: Swift-BAT refined analysis
  98. GRB 090129: Swift detection of a burst
  99. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  100. GRB 090126C: 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