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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"

26689 results found.

  1. GRB 120712A: VLT/Xshooter redshift
  2. GRB 120712A: Swift-XRT refined Analysis
  3. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  4. GRB 120712A: Enhanced Swift-XRT position
  5. GRB 120712A: Swift detection of a burst with optical afterglow
  6. GRB 120711B: Swift-XRT refined Analysis
  7. GRB 120711A: Fermi LAT Detection
  8. GRB 120711B: Swift/UVOT Upper Limits
  9. GRB 120711A: Swift/UVOT Observations
  10. GRB 120711A: Fermi LAT detection
  11. GRB 120711A: MASTER early OT detection
  12. GRB 120711A: Swift-XRT observations
  13. GRB 120711A: REM NIR early time detection
  14. GRB 120711A: GROND photometric redshift
  15. GRB 120711A: Fermi GBM observation
  16. GRB 120711A: MAXI/GSC detection
  17. Continued Skynet/PROMPT observations of GRB120711A
  18. Swift detection of GRB 120711B or a new Galactic transient
  19. Skynet/PROMPT Observations of GRB120711A
  20. GRB 120709A: Fermi GBM detection
  21. GRB 120709A: Swift-XRT observations
  22. GRB 120709A: optical afterglow limits
  23. IPN Triangulation of GRB 120707A
  24. GRB 120709A: Fermi-LAT Detection
  25. GRB 120707A: Fermi GBM Detection of a Bright Burst
  26. GRB 120624B: mm detection at PdBI
  27. GRB 120703A: Swift/UVOT Detection
  28. GRB 120703A: Fermi GBM detection
  29. GRB 120703A: Swift-XRT refined Analysis
  30. GRB 120703A: Enhanced Swift-XRT position
  31. GRB 120624B Suzaku WAM observation of the prompt emission
  32. GRB 120703A: NOT optical observation
  33. GRB 120701A: Swift/UVOT Detection
  34. GRB 120701A: GROND detection of the afterglow
  35. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  36. GRB 120701A: Swift-XRT afterglow detection and analysis
  37. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  38. GRB 120701A: Swift-BAT refined analysis
  39. Swift Trigger 525554 is probably not a GRB
  40. GRB120624B: Chandra observations and afterglow detection
  41. GRB 120624B: Swift/UVOT Upper Limits
  42. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  43. GRB 120624B: Further analysis of the HAWKI observations
  44. GRB 120624B: Swift-XRT observations
  45. GRB 120624B: GROND upper limits
  46. XRF 120626B: MAXI/GSC detection
  47. GRB 120624B: NIR counterpart candidate from HAWKI
  48. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  49. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  50. Swift detection of Ginga 0834-430
  51. GRB 120624B: NOT optical upper limit
  52. Swift detection of IGR J17062-6143
  53. GRB 120624B: optical observations
  54. GRB 120624B, Swift-BAT refined analysis
  55. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  56. GRB 120624A: Fermi GBM observation
  57. GRB 120624B: Fermi-LAT Detection
  58. GRB 120624B: Fermi GBM detection
  59. IPN Triangulation of GRB 120624A (short/intense)
  60. Swift Trigger 524949: Noise fluctuation near a galaxy
  61. GRB 120622A: MAXI/GSC detection
  62. Swift trigger 524642 / SwJ1910.2-0546
  63. GRB 120602A: Suzaku WAM observation of the prompt emission
  64. Swift triggers (#524542) on a Galactic source
  65. IPN Triangulation of GRB 120602A (long/very bright)
  66. GRB 120612A: optical observations
  67. GRB 120612A: Swift/UVOT observations
  68. GRB 120612A: Swift-XRT refined Analysis
  69. GRB 120612A: Enhanced Swift-XRT position
  70. GRB 120612A: BOOTES-3 optical upper limit
  71. GRB 120612A: Swift detection of a burst
  72. GRB 120603A: Suzaku WAM observation of the prompt emission
  73. Konus-Wind observation of GRB 120603A
  74. Konus-Wind observation of GRB 120528B
  75. GRB 120519A: Suzaku WAM observation of the prompt emission
  76. GRB 120528C: MAXI/GSC detection
  77. GRB 120521C redshift estimate
  78. GRB 120512A: Suzaku WAM observation of the prompt emission
  79. GRB120521B: SSO 2.3m upper limits
  80. GRB 120521B: Fermi GBM observation
  81. GRB 120521C: Early Tautenburg limits
  82. GRB 120521A: GROND Upper limits
  83. GRB 120521C: Swift-XRT refined Analysis
  84. GRB 120521C: Swift-BAT refined analysis
  85. GRB 120521C: Keck Observations
  86. GRB 120521C: Swift/UVOT Upper Limits
  87. GRB 120521B: Swift/UVOT Upper Limits
  88. GRB 120521B: GROND Upper limits
  89. GRB 120521A: Swift-XRT refined Analysis
  90. GRB 120521C: PAIRITEL NIR Upper Limits
  91. GRB 120521C: Enhanced Swift-XRT position
  92. GRB 120521C - NOT optical limits
  93. GRB 120521C: TAROT Calern observatory optical observations
  94. GRB 120521C: Swift detection of a burst
  95. GRB 120521B: Swift-BAT refined analysis
  96. GRB 120521B: Swift-XRT refined Analysis
  97. Swift starts a new program to find fainter transients
  98. IPN Triangulation of GRB 120519A (short/hard)
  99. GRB 120521A: Swift/UVOT Upper Limits
  100. GRB 120521B: Enhanced Swift-XRT position

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