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"

28249 results found.

  1. GRB 120624B: Fermi GBM detection
  2. IPN Triangulation of GRB 120624A (short/intense)
  3. Swift Trigger 524949: Noise fluctuation near a galaxy
  4. Swift trigger 524642 / SwJ1910.2-0546
  5. GRB 120602A: Suzaku WAM observation of the prompt emission
  6. Konus-Wind observation of GRB 120617A
  7. Swift triggers (#524542) on a Galactic source
  8. IPN Triangulation of GRB 120602A (long/very bright)
  9. GRB 120612A: optical observations
  10. GRB 120612A: Swift/UVOT observations
  11. GRB 120612A: Swift-XRT refined Analysis
  12. GRB 120612A: Swift-BAT refined analysis
  13. GRB 120612A: Enhanced Swift-XRT position
  14. GRB 120612A: BOOTES-3 optical upper limit
  15. GRB 120612A: Swift detection of a burst
  16. GRB 120603A: Suzaku WAM observation of the prompt emission
  17. Konus-Wind observation of GRB 120603A
  18. Konus-Wind observation of GRB 120528B
  19. GRB 120519A: Suzaku WAM observation of the prompt emission
  20. GRB 120528B: MAXI/GSC detection
  21. GRB 120512A: Suzaku WAM observation of the prompt emission
  22. GRB120521B: SSO 2.3m upper limits
  23. GRB 120521B: Fermi GBM observation
  24. GRB 120521C: Early Tautenburg limits
  25. GRB 120521A: GROND Upper limits
  26. GRB 120521C: Swift-XRT refined Analysis
  27. GRB 120521C: Swift-BAT refined analysis
  28. GRB 120521C: Keck Observations
  29. GRB 120521C: Swift/UVOT Upper Limits
  30. GRB 120521B: Swift/UVOT Upper Limits
  31. GRB 120521B: GROND Upper limits
  32. GRB 120521A: Swift-XRT refined Analysis
  33. GRB 120521C: PAIRITEL NIR Upper Limits
  34. GRB 120521C: Enhanced Swift-XRT position
  35. GRB 120521C: BOOTES-1 optical observations
  36. GRB 120521C - NOT optical limits
  37. GRB 120521C: TAROT Calern observatory optical observations
  38. GRB 120521C: Swift detection of a burst
  39. GRB 120521B: Swift-BAT refined analysis
  40. GRB 120521B: Swift-XRT refined Analysis
  41. Swift starts a new program to find fainter transients
  42. IPN Triangulation of GRB 120519A (short/hard)
  43. GRB 120521A: Swift/UVOT Upper Limits
  44. GRB 120521B: Enhanced Swift-XRT position
  45. GRB 120521A: Swift-BAT refined analysis
  46. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  47. GRB 120521B: TAROT La Silla observatory optical observations
  48. GRB 120521B: Swift detection of a burst
  49. GRB 120521A: Enhanced Swift-XRT position
  50. GRB 120521A: TAROT La Silla observatory optical observations
  51. GRB 120521A: Swift detection of a short burst
  52. GRB 120514A : Suzaku WAM observation of the prompt emission
  53. GRB 120512A: A long GRB detected by INTEGRAL
  54. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  55. GRB 120514A: GROND upper limits
  56. GRB 120514A: Swift/UVOT Upper Limits
  57. GRB 120514A: UKIRT IR observations
  58. Konus-Wind observation of GRB 120510A
  59. GRB 120514A: Swift-XRT refined Analysis
  60. GRB 120514A: APEX observations of the submm counterpart
  61. GRB 120514A: Enhanced Swift-XRT position
  62. GRB 120514A: Swift-BAT refined analysis
  63. GRB 120514A: TAROT Calern observatory optical observations
  64. GRB 120514A: Swift detection of a burst
  65. GRB 120422A: Konkoly optical observations
  66. Fermi Trigger 358364818: BOOTES-4 observations
  67. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  68. GRB 120510A: Swift XRT and UVOT observations
  69. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  70. GRB 120422A: P200 NIR detection
  71. GRB 120422A: Gemini-N detection of a supernova
  72. GRB 120422A: optical observations
  73. Konus-Wind observation of GRB 120427A
  74. Swift detection of 4U 1630-47
  75. GRB 120422A, the review of the sky area in plate archives
  76. Konus-Wind observation of GRB 120426A
  77. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  78. IPN Triangulation of bright GRB 120426A
  79. GRB 120422A: MITSuME Ishigakijima upper limit
  80. Swift Trigger 520928 is probably not a burst
  81. GRB 120422A: 272 GHz observations from SMA
  82. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  83. GRB 120422A GROND observations
  84. GRB 120422A: Super-LOTIS early observations
  85. GRB 120422A: NOT optical observations
  86. GRB 120422A: Zadko observatory - Gingin optical observations
  87. GRB 120422A: Swift-XRT refined Analysis
  88. GRB 120422A: A Swift/UVOT Detection
  89. GRB 120422A: Enhanced Swift-XRT position
  90. GRB 120422A: Swift-BAT refined analysis
  91. GRB 120422A: Gemini observations
  92. GRB 120422A: Faulkes Telescope North observations
  93. GRB 120422A: Swift detection of a burst
  94. GRB 120419A: Swift-XRT and UVOT observations
  95. GRB 120419A: A long GRB detected by INTEGRAL
  96. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  97. Swift Trigger 519874 is probably a noise event
  98. Trigger 519868: Swift detection of SGR1806-20
  99. GRB 120404A: optical observations in Mondy observatory
  100. GRB 120404A: optical observations

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