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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"

28282 results found.

  1. GRB 120709A: optical afterglow limits
  2. IPN Triangulation of GRB 120707A
  3. GRB 120709A: Fermi-LAT Detection
  4. GRB 120707A: Fermi GBM Detection of a Bright Burst
  5. GRB 120624B: mm detection at PdBI
  6. GRB 120703A: Swift/UVOT Detection
  7. GRB 120703A: Swift-XRT refined Analysis
  8. GRB 120703A: Enhanced Swift-XRT position
  9. GRB 120703A: Swift-BAT refined analysis
  10. GRB 120624B Suzaku WAM observation of the prompt emission
  11. GRB 120703A: NOT optical observation
  12. GRB 120701A: Swift/UVOT Detection
  13. GRB 120701A: GROND detection of the afterglow
  14. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  15. GRB 120701A: Swift-XRT afterglow detection and analysis
  16. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  17. GRB 120701A: Swift-BAT refined analysis
  18. Swift Trigger 525554 is probably not a GRB
  19. GRB120624B: Chandra observations and afterglow detection
  20. GRB 120624B: Swift/UVOT Upper Limits
  21. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  22. GRB 120624B: Swift-XRT observations
  23. GRB 120624B: GROND upper limits
  24. GRB 120624B: NIR counterpart candidate from HAWKI
  25. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  26. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  27. Swift detection of Ginga 0834-430
  28. GRB 120624B: NOT optical upper limit
  29. Swift detection of IGR J17062-6143
  30. GRB 120624B: optical observations
  31. GRB 120624B, Swift-BAT refined analysis
  32. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  33. GRB 120624B: Fermi-LAT Detection
  34. GRB 120624B: Fermi GBM detection
  35. IPN Triangulation of GRB 120624A (short/intense)
  36. Swift Trigger 524949: Noise fluctuation near a galaxy
  37. Swift trigger 524642 / SwJ1910.2-0546
  38. GRB 120602A: Suzaku WAM observation of the prompt emission
  39. Konus-Wind observation of GRB 120617A
  40. Swift triggers (#524542) on a Galactic source
  41. IPN Triangulation of GRB 120602A (long/very bright)
  42. GRB 120612A: optical observations
  43. GRB 120612A: Swift/UVOT observations
  44. GRB 120612A: Swift-XRT refined Analysis
  45. GRB 120612A: Swift-BAT refined analysis
  46. GRB 120612A: Enhanced Swift-XRT position
  47. GRB 120612A: BOOTES-3 optical upper limit
  48. GRB 120612A: Swift detection of a burst
  49. GRB 120603A: Suzaku WAM observation of the prompt emission
  50. Konus-Wind observation of GRB 120603A
  51. Konus-Wind observation of GRB 120528B
  52. GRB 120519A: Suzaku WAM observation of the prompt emission
  53. GRB 120528B: MAXI/GSC detection
  54. GRB 120512A: Suzaku WAM observation of the prompt emission
  55. GRB120521B: SSO 2.3m upper limits
  56. GRB 120521B: Fermi GBM observation
  57. GRB 120521C: Early Tautenburg limits
  58. GRB 120521A: GROND Upper limits
  59. GRB 120521C: Swift-XRT refined Analysis
  60. GRB 120521C: Swift-BAT refined analysis
  61. GRB 120521C: Keck Observations
  62. GRB 120521C: Swift/UVOT Upper Limits
  63. GRB 120521B: Swift/UVOT Upper Limits
  64. GRB 120521B: GROND Upper limits
  65. GRB 120521A: Swift-XRT refined Analysis
  66. GRB 120521C: PAIRITEL NIR Upper Limits
  67. GRB 120521C: Enhanced Swift-XRT position
  68. GRB 120521C: BOOTES-1 optical observations
  69. GRB 120521C - NOT optical limits
  70. GRB 120521C: TAROT Calern observatory optical observations
  71. GRB 120521C: Swift detection of a burst
  72. GRB 120521B: Swift-BAT refined analysis
  73. GRB 120521B: Swift-XRT refined Analysis
  74. Swift starts a new program to find fainter transients
  75. IPN Triangulation of GRB 120519A (short/hard)
  76. GRB 120521A: Swift/UVOT Upper Limits
  77. GRB 120521B: Enhanced Swift-XRT position
  78. GRB 120521A: Swift-BAT refined analysis
  79. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  80. GRB 120521B: TAROT La Silla observatory optical observations
  81. GRB 120521B: Swift detection of a burst
  82. GRB 120521A: Enhanced Swift-XRT position
  83. GRB 120521A: TAROT La Silla observatory optical observations
  84. GRB 120521A: Swift detection of a short burst
  85. GRB 120514A : Suzaku WAM observation of the prompt emission
  86. GRB 120512A: A long GRB detected by INTEGRAL
  87. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  88. GRB 120514A: GROND upper limits
  89. GRB 120514A: Swift/UVOT Upper Limits
  90. GRB 120514A: UKIRT IR observations
  91. Konus-Wind observation of GRB 120510A
  92. GRB 120514A: Swift-XRT refined Analysis
  93. GRB 120514A: APEX observations of the submm counterpart
  94. GRB 120514A: Enhanced Swift-XRT position
  95. GRB 120514A: Swift-BAT refined analysis
  96. GRB 120514A: TAROT Calern observatory optical observations
  97. GRB 120514A: Swift detection of a burst
  98. GRB 120422A: Konkoly optical observations
  99. Fermi Trigger 358364818: BOOTES-4 observations
  100. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate

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