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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"

20517 results found.

  1. GRB 120624B: Swift-XRT observations
  2. GRB 120624B: GROND upper limits
  3. XRF 120626B: MAXI/GSC detection
  4. GRB 120624B: NIR counterpart candidate from HAWKI
  5. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  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. Konus-Wind observation of GRB 120624B
  12. GRB 120624B: Fermi-LAT Detection
  13. Konus-Wind observation of GRB 120624A
  14. IPN Triangulation of GRB 120624A (short/intense)
  15. Swift Trigger 524949: Noise fluctuation near a galaxy
  16. GRB 120622A: MAXI/GSC detection
  17. Swift trigger 524642 / SwJ1910.2-0546
  18. GRB 120602A: Suzaku WAM observation of the prompt emission
  19. Konus-Wind observation of GRB 120617A
  20. Swift triggers (#524542) on a Galactic source
  21. Konus-Wind observation of GRB 120602A
  22. IPN Triangulation of GRB 120602A (long/very bright)
  23. GRB 120614A: MAXI/GSC detection of a burst
  24. GRB 120612A: optical observations
  25. GRB 120612A: Swift/UVOT observations
  26. GRB 120612A: Enhanced Swift-XRT position
  27. GRB 120612A: BOOTES-3 optical upper limit
  28. GRB 120612A: Swift detection of a burst
  29. GRB 120528C: MAXI/GSC detection
  30. GRB 120528B: MAXI/GSC detection
  31. GRB 120512A: Suzaku WAM observation of the prompt emission
  32. GRB120521B: SSO 2.3m upper limits
  33. GRB 120521C: Early Tautenburg limits
  34. GRB 120521A: GROND Upper limits
  35. GRB 120521C: Keck Observations
  36. GRB 120521C: Swift/UVOT Upper Limits
  37. GRB 120521B: Swift/UVOT Upper Limits
  38. GRB 120521B: GROND Upper limits
  39. GRB 120521C: PAIRITEL NIR Upper Limits
  40. GRB 120521C: Enhanced Swift-XRT position
  41. GRB 120521C - NOT optical limits
  42. GRB 120521C: TAROT Calern observatory optical observations
  43. GRB 120521C: Swift detection of a burst
  44. Swift starts a new program to find fainter transients
  45. IPN Triangulation of GRB 120519A (short/hard)
  46. GRB 120521A: Swift/UVOT Upper Limits
  47. GRB 120521B: Enhanced Swift-XRT position
  48. GRB 120521B: TAROT La Silla observatory optical observations
  49. GRB 120521B: Swift detection of a burst
  50. GRB 120521A: Enhanced Swift-XRT position
  51. GRB 120521A: TAROT La Silla observatory optical observations
  52. GRB 120521A: Swift detection of a short burst
  53. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  54. GRB 120514A: GROND upper limits
  55. GRB 120514A: Swift/UVOT Upper Limits
  56. GRB 120514A: UKIRT IR observations
  57. GRB 120514A: APEX observations of the submm counterpart
  58. GRB 120514A: Enhanced Swift-XRT position
  59. GRB 120514A: TAROT Calern observatory optical observations
  60. GRB 120514A: Swift detection of a burst
  61. GRB 120422A: Konkoly optical observations
  62. Fermi Trigger 358364818: BOOTES-4 observations
  63. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  64. GRB 120510A: Swift XRT and UVOT observations
  65. GRB 120510A: MAXI/GSC detection of a burst
  66. GRB 120422A: P200 NIR detection
  67. GRB 120422A: Gemini-N detection of a supernova
  68. GRB 120422A: optical observations
  69. Swift detection of 4U 1630-47
  70. GRB 120422A, the review of the sky area in plate archives
  71. IPN Triangulation of bright GRB 120426A
  72. GRB 120422A: MITSuME Ishigakijima upper limit
  73. Swift Trigger 520928 is probably not a burst
  74. GRB 120424A: MAXI/GSC detection of a burst
  75. GRB 120422A: 272 GHz observations from SMA
  76. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  77. GRB 120422A GROND observations
  78. GRB 120422A: Super-LOTIS early observations
  79. GRB 120422A: NOT optical observations
  80. GRB 120422A: Zadko observatory - Gingin optical observations
  81. GRB 120422A: A Swift/UVOT Detection
  82. GRB 120422A: Enhanced Swift-XRT position
  83. GRB 120422A: Gemini observations
  84. GRB 120422A: Faulkes Telescope North observations
  85. GRB 120422A: Swift detection of a burst
  86. GRB 120419A: Swift-XRT and UVOT observations
  87. Swift Trigger 519874 is probably a noise event
  88. Trigger 519868: Swift detection of SGR1806-20
  89. GRB 120404A: optical observations in Mondy observatory
  90. GRB 120404A: optical observations
  91. GRB 120404A, Optical Observations
  92. GRB120404A: GROND observations show steeply decaying afterglow
  93. GRB120404A: MOA optical observations of the initial rise afterglow
  94. GRB 120404A: Swift/UVOT Detection
  95. GRB 120404A: MITSuME Ishigakijima Optical Observation
  96. GRB 120404A: MITSuME Okayama Optical Observation
  97. GRB 120404A : TNT optical observation
  98. GRB 120404A: Swift-BAT refined analysis
  99. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  100. GRB 120404A: Enhanced Swift-XRT position

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