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"

38149 results found.

  1. GRB 100424A: Swift detection of a burst
  2. GRB 100420A: GRT Optical Observation
  3. GRB 100418A: ROVOR optical measurements at 35 hours
  4. GRB 100418A: Possible Evidence for a Supernova
  5. GRB 100420A: Swift-BAT refined analysis
  6. GRB 100423B: Fermi GBM detection
  7. GRB 100423A: Swift-BAT refined analysis
  8. Trigger 420256: Swift detection of a possible GRB
  9. GRB 100423A: Skynet/PROMPT Detections
  10. GRB 100423A: GROND discovery of afterglow
  11. GRB 100423A: Swift detection of a burst
  12. Radio afterglow detection of GRB 100418A with the EVLA
  13. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  14. GRB 100418A: Continued PAIRITEL NIR Observations
  15. GRB 100418A: WSRT Radio Detection
  16. GRB100418A: REM possible afterglow detection
  17. GRB 100418A: Continuing Swift/UVOT Observations
  18. GRB 100418A: further GROND observations and light curve fit
  19. GRB 100418A: RTT150 optical observations
  20. GRB100420A: MITSuME optical upper limits
  21. GRB 100414A: CFHT optical observations
  22. GRB 100420A: Swift/UVOT Upper Limits
  23. GRB 100420A: XRT refined analysis
  24. GRB 100420A: Enhanced Swift-XRT position
  25. GRB 100418A: SARA second epoch
  26. GRB 100420A: SARA Upper Limits
  27. GRB 100418A: RTT150 observations during the optical afterglow maximum
  28. GRB 100418A: optical observations
  29. GRB 100418A: MASTER-Net optical observations
  30. GRB 100414A: Confirmation of the X-ray afterglow
  31. GRB 100418A: VLT optical observations
  32. GRB 100418A: SMA submm detection
  33. GRB 100420A: ROTSE-III Optical Limits
  34. GRB 100420A: Swift detection of a burst
  35. GRB 100418A PAIRITEL NIR Observations
  36. GRB 100418A: ROVOR optical afterglow detection
  37. GRB 100418A: Swift/UVOT Observations
  38. GRB 100418A: Gemini-N redshift confirmation
  39. GRB 100413A: GMRT observation of radio afterglow
  40. GRB 100418A: Swift-XRT Refined Analysis
  41. GRB 100418A: host galaxy detection in the SDSS
  42. GRB100418A: VLT/X-shooter redshift and photometry
  43. GRB 100418A: SARA observations
  44. GRB100414A: SAO RAS optical observations
  45. GRB 100418A: GROND observations; missing author list added
  46. GRB 100418A: GROND observations
  47. GRB 100418A: Swift-BAT refined analysis
  48. GRB 100418A: Enhanced Swift-XRT position
  49. GRB 100418A: ROTSE-III Optical Limits
  50. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  51. GRB 100413A: Radio Afterglow Detection with the EVLA
  52. GRB 100414A: Suzaku WAM observation of the prompt emission
  53. GRB 100414A: Swift/UVOT Observations
  54. GRB 100414A: Gemini-N observation (correction)
  55. GRB 100414A: GROND Detection of the Optical Afterglow
  56. GRB 100414A: Gemini-N candidate and redshift
  57. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  58. GRB 100413A: Suzaku WAM observation of the prompt emission
  59. GRB 100414A: Palomar Transient Factory Observations
  60. GRB 100413B: Swift Confirmation of Burst
  61. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  62. GRB 100413A: Swift-BAT final refined analysis
  63. GRB 100414A: IPN Localization
  64. Konus-Wind observation of GRB 100414A (correction to GCN 10597)
  65. Konus-Wind observation of GRB 100414B
  66. GRB 100415A: MAXI/GSC detection of a probable GRB
  67. GRB 100414A: Fermi GBM detection
  68. GRB100414A: Fermi LAT detection
  69. GRB 100413B : Swift detection of a burst
  70. GRB 100413A: GROND Upper limits
  71. GRB 100413A: Swift/UVOT Upper Limits
  72. Konus-Wind observation of GRB 100413A
  73. GRB 100413A: Faulkes Telescope South observations
  74. Tentative redshift of GRB100413A from X-ray data
  75. GRB 100413A: SARA upper limit
  76. GRB 100413A: Swift-XRT Refined Analysis
  77. GRB 100413A: Swift-BAT initial refined analysis
  78. GRB 100413A: Enhanced Swift-XRT position
  79. GRB 100413: xinglong TNT optical upper limit
  80. GRB 100413A: MASTER-Net optical observations
  81. GRB 100413A: Swift detection of a burst
  82. Swift-BAT trigger 419015 is not astrophysical
  83. Trigger 419015 is probably not a GRB
  84. GRB100401A: GROND Upper Limits
  85. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  86. IBAS Alert n. 5996: not a GRB
  87. IBAS Alert n. 5995: not a GRB
  88. GRB 100331B: GROND Upper limits
  89. GRB 100401A: Swift/UVOT Upper Limit
  90. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  91. GRB 100401A: Fermi GBM detection
  92. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  93. GRB 100331B: BOOTES-3 observations
  94. GRB 100316A: R-band limit
  95. GRB 100324B: Suzaku WAM observation of the prompt emission
  96. GRB 100331B: Swift/UVOT Upper Limits
  97. GRB 100331B: Swift/XRT possible afterglow candidate
  98. GRB 100331B: SuperAGILE Localization of a Long GRB
  99. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  100. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source

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