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"

19662 results found.

  1. SGR 1833-0832: Archival Chandra Observations
  2. SGR 1833-0832 is pulsed at 7.56 seconds
  3. SGR 1833-0832 is pulsed at 7.56 seconds
  4. Discovery of the Spin Period of SGR 1833-0832
  5. GRB 100319A: correction to GCN 10527
  6. Probable SGR 1833-0832: Swift-XRT refined analysis
  7. Probable SGR 1833-0832: Enhanced Swift-XRT position
  8. Swift-XRT refined position of the probable new SGR 1833-0832
  9. Swift-BAT refined analysis of the probable new SGR 1833-0832
  10. GRB 100219A: MASTER-Net optical alert observations
  11. GRB 100319A: Swift detection of a burst; possible SGR
  12. GRB 100316D: Pre-burst emission measured by BAT
  13. GRB 100219A: optical upper limit
  14. GRB 100316A: optical observations in CrAO
  15. GRB 100316D: Swift/UVOT Observations
  16. GRB 100316D: Swift XRT enhanced position and further refined analysis
  17. GRB 100316B: Swift-XRT refined analysis
  18. Tentative redshift of GRB100316D from X-ray data
  19. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  20. Trigger 416226 is probably not a GRB
  21. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  22. GRB 100316D: Swift-BAT refined analysis
  23. GRB100316C: Swift/UVOT Upper Limits
  24. GRB 100316C: Swift-BAT refined analysis
  25. GRB 100316B: Swift/UVOT observations
  26. GRB 100316C: Swift-XRT team refined analysis
  27. GRB 100316C: Enhanced Swift-XRT position
  28. GRB 100316D: Swift XRT refined analysis
  29. GRB 100316A: TAROT Calern observatory optical observations
  30. GRB 100316A: Swift-XRT refined analysis
  31. GRB 100316B: Enhanced Swift-XRT position
  32. GRB 100316A: Swift-BAT refined analysis
  33. GRB 100316B: Swift-BAT refined analysis
  34. GRB100316A: Swift/UVOT Upper Limits
  35. Trigger 416140 is almost certainly not a GRB
  36. GRB 100316D: Swift detection of a burst
  37. GRB 100316B: Skynet/PROMPT Observations of Fading
  38. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  39. GRB 100316C: Swift detection of a burst
  40. GRB 100316A: Enhanced Swift-XRT position
  41. GRB 100316B: Swift detection of a burst with optical counterpart
  42. GRB 100316A: Swift/UVOT Observations
  43. GRB 100316A: Swift-XRT detection
  44. GRB 100316A: Swift detection of a burst
  45. GRB 100305A, Swift-BAT refined analysis
  46. GRB 100305A: Swift/UVOT Upper Limits
  47. GRB 100305A: Swift-XRT refined analysis
  48. GRB 100305A Optical Observations
  49. GRB 100305A: Enhanced Swift-XRT position
  50. GRB 100305A: PAIRITEL NIR Upper Limits
  51. GRB 100305A: Swift detection of a burst
  52. GRB 100302A: Swift/UVOT Upper Limits
  53. GRB 100302A: Swift-XRT refined analysis
  54. GRB 100302A: Optical observations at Crni Vrh
  55. GRB 100302A: MASTER-Net optical alert observations
  56. GRB 100302A, Swift-BAT refined analysis
  57. GRB 100302A: Enhanced Swift-XRT position
  58. GRB 100302A: Skynet/DAO Observations
  59. GRB 100302A: Swift detection of a burst
  60. GRB 100206A: optical observations in CrAO
  61. GRB 100206A: optical observations in Terskol
  62. GRB 100219A: optical observations
  63. GRB 100224A SHB found in ground analysis of BAT data
  64. Swift Triggers 413744 and 413745 are not GRBs
  65. GRB
  66. GRB 100219A: XRT refined analysis
  67. GRB 100216A: Swift/UVOT Observations
  68. GRB 100219A: GROND observations
  69. GRB 100219A: Enhanced Swift-XRT position
  70. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  71. GRB 100216A: XRT Refined Analysis
  72. GRB 100219A: Swift-BAT refined analysis
  73. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  74. GRB 100219A: Swift detection of a burst
  75. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  76. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  77. GRB 100213B: GRT Optical Observation
  78. GRB 100213A: GRT Optical Observation
  79. GRB 100213A: Swift-BAT refined analysis
  80. GRB 100213B: Enhanced Swift-XRT position
  81. GRB 100213B: Swift/UVOT Upper Limits
  82. GRB 100213A: Swift/UVOT Upper Limits
  83. GRB 100213B: PAIRITEL NIR Upper Limits
  84. GRB 100213A: Enhanced Swift-XRT position
  85. GRB 100213B: Swift-BAT refined analysis
  86. GRB 100213B: Swift XRT refined analysis
  87. GRB 100213A: Swift XRT refined analysis
  88. GRB 100213B: Swift detection of a burst
  89. GRB 100213A: Swift detection of a burst
  90. Swift/UVOT observations of GRB100212A - correction of the name of the burst
  91. Swift/UVOT observations of GRB120212A
  92. GRB 100212A: Fermi GBM detection
  93. GRB 100212A: Swift XRT refined analysis
  94. GRB 100212A: Swift-BAT refined analysis
  95. GRB 100212A: Enhanced Swift-XRT position
  96. GRB 100212A: Swift detection of a burst
  97. GRB 100206A: GROND upper limits
  98. GRB 100206A: Swift/UVOT Upper Limits
  99. GRB 100206A: MASTER-Net optical alert observations
  100. GRB 100206A, RIMOTS optical upper limits

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