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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"

28261 results found.

  1. GRB 120624B: Swift-XRT observations
  2. GRB 120624B: GROND upper limits
  3. GRB 120624B: NIR counterpart candidate from HAWKI
  4. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  5. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  6. Swift detection of Ginga 0834-430
  7. GRB 120624B: NOT optical upper limit
  8. Swift detection of IGR J17062-6143
  9. GRB 120624B: optical observations
  10. GRB 120624B, Swift-BAT refined analysis
  11. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  12. GRB 120624B: Fermi-LAT Detection
  13. GRB 120624B: Fermi GBM detection
  14. IPN Triangulation of GRB 120624A (short/intense)
  15. Swift Trigger 524949: Noise fluctuation near a galaxy
  16. Swift trigger 524642 / SwJ1910.2-0546
  17. GRB 120602A: Suzaku WAM observation of the prompt emission
  18. Konus-Wind observation of GRB 120617A
  19. Swift triggers (#524542) on a Galactic source
  20. IPN Triangulation of GRB 120602A (long/very bright)
  21. GRB 120612A: optical observations
  22. GRB 120612A: Swift/UVOT observations
  23. GRB 120612A: Swift-XRT refined Analysis
  24. GRB 120612A: Swift-BAT refined analysis
  25. GRB 120612A: Enhanced Swift-XRT position
  26. GRB 120612A: BOOTES-3 optical upper limit
  27. GRB 120612A: Swift detection of a burst
  28. GRB 120603A: Suzaku WAM observation of the prompt emission
  29. Konus-Wind observation of GRB 120603A
  30. Konus-Wind observation of GRB 120528B
  31. GRB 120519A: Suzaku WAM observation of the prompt emission
  32. GRB 120528B: MAXI/GSC detection
  33. GRB 120512A: Suzaku WAM observation of the prompt emission
  34. GRB120521B: SSO 2.3m upper limits
  35. GRB 120521B: Fermi GBM observation
  36. GRB 120521C: Early Tautenburg limits
  37. GRB 120521A: GROND Upper limits
  38. GRB 120521C: Swift-XRT refined Analysis
  39. GRB 120521C: Swift-BAT refined analysis
  40. GRB 120521C: Keck Observations
  41. GRB 120521C: Swift/UVOT Upper Limits
  42. GRB 120521B: Swift/UVOT Upper Limits
  43. GRB 120521B: GROND Upper limits
  44. GRB 120521A: Swift-XRT refined Analysis
  45. GRB 120521C: PAIRITEL NIR Upper Limits
  46. GRB 120521C: Enhanced Swift-XRT position
  47. GRB 120521C: BOOTES-1 optical observations
  48. GRB 120521C - NOT optical limits
  49. GRB 120521C: TAROT Calern observatory optical observations
  50. GRB 120521C: Swift detection of a burst
  51. GRB 120521B: Swift-BAT refined analysis
  52. GRB 120521B: Swift-XRT refined Analysis
  53. Swift starts a new program to find fainter transients
  54. IPN Triangulation of GRB 120519A (short/hard)
  55. GRB 120521A: Swift/UVOT Upper Limits
  56. GRB 120521B: Enhanced Swift-XRT position
  57. GRB 120521A: Swift-BAT refined analysis
  58. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  59. GRB 120521B: TAROT La Silla observatory optical observations
  60. GRB 120521B: Swift detection of a burst
  61. GRB 120521A: Enhanced Swift-XRT position
  62. GRB 120521A: TAROT La Silla observatory optical observations
  63. GRB 120521A: Swift detection of a short burst
  64. GRB 120514A : Suzaku WAM observation of the prompt emission
  65. GRB 120512A: A long GRB detected by INTEGRAL
  66. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  67. GRB 120514A: GROND upper limits
  68. GRB 120514A: Swift/UVOT Upper Limits
  69. GRB 120514A: UKIRT IR observations
  70. Konus-Wind observation of GRB 120510A
  71. GRB 120514A: Swift-XRT refined Analysis
  72. GRB 120514A: APEX observations of the submm counterpart
  73. GRB 120514A: Enhanced Swift-XRT position
  74. GRB 120514A: Swift-BAT refined analysis
  75. GRB 120514A: TAROT Calern observatory optical observations
  76. GRB 120514A: Swift detection of a burst
  77. GRB 120422A: Konkoly optical observations
  78. Fermi Trigger 358364818: BOOTES-4 observations
  79. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  80. GRB 120510A: Swift XRT and UVOT observations
  81. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  82. GRB 120422A: P200 NIR detection
  83. GRB 120422A: Gemini-N detection of a supernova
  84. GRB 120422A: optical observations
  85. Konus-Wind observation of GRB 120427A
  86. Swift detection of 4U 1630-47
  87. GRB 120422A, the review of the sky area in plate archives
  88. Konus-Wind observation of GRB 120426A
  89. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  90. IPN Triangulation of bright GRB 120426A
  91. GRB 120422A: MITSuME Ishigakijima upper limit
  92. Swift Trigger 520928 is probably not a burst
  93. GRB 120422A: 272 GHz observations from SMA
  94. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  95. GRB 120422A GROND observations
  96. GRB 120422A: Super-LOTIS early observations
  97. GRB 120422A: NOT optical observations
  98. GRB 120422A: Zadko observatory - Gingin optical observations
  99. GRB 120422A: Swift-XRT refined Analysis
  100. GRB 120422A: A Swift/UVOT Detection

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