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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"

18515 results found.

  1. GRB 111208A: Swift-XRT refined analysis
  2. GRB 111210A: Gemini-North candidate counterpart
  3. GRB111210A: MITSuME Okayama J-band upper-limit
  4. GRB 111210A: Swift/UVOT Upper Limits
  5. GRB 111210A: Enhanced Swift-XRT position
  6. GRB 111210A: Swift detection of a burst
  7. GRB 111209A: GROND Afterglow observations
  8. GRB 111209A optical limit by "Pi of the Sky"
  9. GRB 111209A: PROMPT optical observations of early afterglow
  10. GRB 111208A: Lightbuckets Optical Observations
  11. GRB 111209A: Swift UVOT refined analysis
  12. GRB 111209A: Swift Burst of Interest
  13. GRB 111209A: Enhanced Swift-XRT position
  14. GRB 111205A: GROND observations
  15. GRB 111209A: REM NIR detection
  16. GRB 111209A: TAROT La Silla observatory optical detection
  17. GRB 111209A: Swift detection of a long burst with an optical counterpart
  18. GRB 111208A: Swift XRT/UVOT observations
  19. GRB 111205A: Swift XRT Observations
  20. GRB 111204A: TNG NIR observations
  21. GRB 111201A: GMG optical observation
  22. GRB 111204A: GROND Observations
  23. GRB 111204A: Swift-XRT refined Analysis
  24. GRB 111022B: CrAO optical limit
  25. GRB 111204A: Swift/UVOT Upper Limits
  26. GRB 110921A: optical observations in Maidanak observatory
  27. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  28. GRB 111204A: Enhanced Swift-XRT position
  29. GRB 111123A: optical upper limit in CrAO
  30. GRB 111204A: Swift detection of a burst
  31. GRB 111201A: Swift/UVOT Upper Limits
  32. GRB 111129A: Swift/UVOT Detection
  33. GRB 111129A, GROND afterglow observations
  34. GRB 111129A: Enhanced Swift-XRT position
  35. GRB 111129A: Swift detection of a burst with an optical counterpart
  36. GRB 111123A: Swift/UVOT Upper Limits
  37. GRB 111123A - NOT optical observations
  38. GRB 111123A, GROND observations
  39. GRB 111123A: TNG NIR detection of the afterglow candidate
  40. GRB 111123A: Swift-XRT refined Analysis
  41. GRB 111123A: MITSuME Okayama Optical upper limits
  42. GRB 111123A: Enhanced Swift-XRT position
  43. GRB 111123A: GMG optical observation
  44. GRB 111117A: Refined Chandra Astrometry
  45. GRB 111123A: Swift detection of a burst
  46. GRB 111121A: Swift/UVOT Upper Limits
  47. GRB 111121A: Magellan/Megacam observations
  48. GRB 111121A: Swift-XRT refined Analysis
  49. GRB 111121A: Enhanced Swift-XRT position
  50. GRB 111121A: Swift detection of a short hard burst
  51. GRB 111117A: Gemini Afterglow Limits
  52. GRB 111117A: optical upper limit in CrAO
  53. GRB 111117A: TNG observations
  54. GRB 111117A: Swift/UVOT Upper Limits
  55. GRB 111117A: GROND observations
  56. GRB 111117A: Gemini host observation
  57. GRB 111117A: Swift-XRT refined Analysis
  58. GRB111107A: Further ATCA observations - no detection
  59. GRB 111117A: NOT observations
  60. GRB 111117A: Chandra ToO observation scheduled
  61. GRB 111117A: GMG upper limit
  62. GRB 111117A: Swift detection of a short hard burst
  63. GRB111107A: ATCA observations - upper limit and a possible detection
  64. IPN Triangulation of GRB 111113A (short/hard/intense)
  65. GRB 111109A: Swift/UVOT Photometry
  66. GRB 111109A: Enhanced Swift-XRT position
  67. GRB 111109A: Swift-XRT observations
  68. GRB 111103B: optical upper limit of CrAO
  69. GRB 111103B: optical upper limit of Mt. Terskol observatory
  70. Continued Skynet observations of GRB111107A
  71. GRB 111107A: APEX submm observation
  72. GRB 111107A: Swift/UVOT Afterglow Analysis
  73. GRB 111107A: Enhanced Swift-XRT position
  74. GRB 111107A: GROND observations
  75. Skynet observations of GRB 111107A
  76. GRB 111107A: Swift detection of a burst with an optical counterpart
  77. GRB 111103B: MITSuME Akeno Optical upper limits
  78. GRB 111103B : WIYN 3.5m NIR observations
  79. GRB 111103B: Swift-XRT refined Analysis
  80. GRB111103B Swift/UVOT Upper Limits
  81. GRB 111103B: Enhanced Swift-XRT position
  82. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  83. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  84. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  85. GRB 111029A: SAO RAS optical limits
  86. GRB 111029A: Super-LOTIS early limits
  87. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  88. GRB 111029A: PAIRITEL NIR Upper Limits
  89. GRB 111029A: Swift/UVOT Upper Limits
  90. GRB 111029A: Enhanced Swift-XRT position
  91. GRB 111029A: optical upper limit
  92. GRB 111029A: ROTSE-III Optical Limits
  93. GRB 111029A: Swift detection of a burst
  94. GRB 111022B: 10.4m GTC z'-band observations
  95. GRB111022B: D50 optical limit
  96. GRB 111020A: Chandra Observation
  97. GRB 111022B: BTA Optical Observations
  98. GRB 111022A: MITSuME Akeno Optical upper limits
  99. GRB 111024A: MAXI/GSC detection of a burst
  100. GRB 111022B: Swift/UVOT upper limits

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