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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"

43104 results found.

  1. GRB 120703A: Enhanced Swift-XRT position
  2. GRB 120703A: Swift-BAT refined analysis
  3. GRB 120624B Suzaku WAM observation of the prompt emission
  4. Konus-Wind observation of GRB 120703A
  5. GRB 120703A: NOT optical observation
  6. GRB 120701A: Swift/UVOT Detection
  7. GRB 120701A: GROND detection of the afterglow
  8. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  9. Swift Trigger 525554 is noise
  10. GRB 120701A: Swift-XRT afterglow detection and analysis
  11. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  12. GRB 120701A: Swift-BAT refined analysis
  13. GRB 120630A: NOT optical source within the XRT error circle
  14. Swift Trigger 525554 is probably not a GRB
  15. GRB120624B: Chandra observations and afterglow detection
  16. GRB 120624B Further Swift-XRT analysis
  17. GRB 120624B: Swift/UVOT Upper Limits
  18. Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
  19. GRB 120624B: Further analysis of the HAWKI observations
  20. GRB 120624B: Swift-XRT observations
  21. GRB 120624B: GROND upper limits
  22. XRF 120626B: MAXI/GSC detection
  23. GRB 120624B: NIR counterpart candidate from HAWKI
  24. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  25. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  26. Swift detection of Ginga 0834-430
  27. GRB 120624B: NOT optical upper limit
  28. Swift detection of IGR J17062-6143
  29. GRB 120624B: optical observations
  30. GRB 120624B, Swift-BAT refined analysis
  31. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  32. Konus-Wind observation of GRB 120624B
  33. GRB 120624B: Swift detection of a burst
  34. GRB 120624A: Fermi GBM observation
  35. GRB 120624B: Fermi-LAT Detection
  36. Konus-Wind observation of GRB 120624A
  37. GRB 120624B: Fermi GBM detection
  38. IPN Triangulation of GRB 120624A (short/intense)
  39. Swift Trigger 524949: Noise fluctuation near a galaxy
  40. GRB 120622A: MAXI/GSC detection
  41. Swift trigger 524642 / SwJ1910.2-0546
  42. GRB 120602A: Suzaku WAM observation of the prompt emission
  43. Konus-Wind observation of GRB 120617A
  44. IPN Triangulation of GRB 120617A (short/intense)
  45. Swift Trigger 524642 is Swift J1910.2-0546
  46. Trigger 524584: Swift detection of Algol
  47. Swift triggers (#524542) on a Galactic source
  48. Konus-Wind observation of GRB 120602A
  49. IPN Triangulation of GRB 120602A (long/very bright)
  50. GRB 120614A: MAXI/GSC detection of a burst
  51. GRB 120612A: optical observations
  52. GRB 120612A: Swift/UVOT observations
  53. GRB 120612A: Swift-XRT refined Analysis
  54. GRB 120612A: Swift-BAT refined analysis
  55. GRB 120612A: Enhanced Swift-XRT position
  56. GRB 120612A: BOOTES-3 optical upper limit
  57. GRB 120612A: Swift detection of a burst
  58. GRB 120603A: Suzaku WAM observation of the prompt emission
  59. GBM triggers 120604.526 & 120604.399 were not GRBs
  60. Konus-Wind observation of GRB 120603A
  61. IPN Triangulation of short GRB 120603A
  62. Konus-Wind observation of GRB 120528B
  63. GRB 120519A: Suzaku WAM observation of the prompt emission
  64. GRB 120528C: MAXI/GSC detection
  65. GRB 120521C redshift estimate
  66. GRB 120512A: Suzaku WAM observation of the prompt emission
  67. GRB 120521C: EVLA Localization of Afterglow
  68. GRB 120521C: EVLA 22 GHz Detection
  69. GRB120521B: SSO 2.3m upper limits
  70. Konus-Wind observation of GRB 120522A
  71. IPN triangulation of GRB 120522A (long/intense)
  72. GRB 120521B: Fermi GBM observation
  73. GRB 120521A: ATCA 34GHz upper limit
  74. GRB 120521C: Early Tautenburg limits
  75. GRB 120521C: EVLA 22 GHz Upper Limit
  76. GRB 120521A: GROND Upper limits
  77. GRB 120521C: Swift-XRT refined Analysis
  78. GRB 120521C: Keck Observations
  79. GRB 120521C: Swift/UVOT Upper Limits
  80. GRB 120521B: Swift/UVOT Upper Limits
  81. GRB 120521C: MASTER optical limit
  82. GRB 120521B: GROND Upper limits
  83. GRB 120521A: XRT light curve (Correction to GCN 13326)
  84. GRB 120521A: Swift-XRT refined Analysis
  85. GRB 120521C: PAIRITEL NIR Upper Limits
  86. GRB 120521C: Enhanced Swift-XRT position
  87. GRB 120521C: WHT optical observations
  88. GRB 120521C - NOT optical limits
  89. GRB 120521C: TAROT Calern observatory optical observations
  90. GRB 120521C: Swift detection of a burst
  91. GRB 120521B: Swift-BAT refined analysis
  92. GRB 120521B: Swift-XRT refined Analysis
  93. Konus-Wind observation of GRB 120519A
  94. Swift starts a new program to find fainter transients
  95. IPN Triangulation of GRB 120519A (short/hard)
  96. GRB 120521A: Swift/UVOT Upper Limits
  97. GRB 120521B: Enhanced Swift-XRT position
  98. GRB 120521A: Swift-BAT refined analysis
  99. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  100. GRB 120521B: TAROT La Silla observatory optical observations

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