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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"

28275 results found.

  1. GRB 111129A: Swift/UVOT Detection
  2. GRB 111129A, GROND afterglow observations
  3. GRB 111129A: Swift-XRT refined Analysis
  4. GRB 111129A: Swift-BAT refined analysis
  5. GRB 111129A: Enhanced Swift-XRT position
  6. GRB 111129A: Swift detection of a burst with an optical counterpart
  7. GRB 111123A, Swift-BAT refined analysis
  8. GRB 111123A: Swift/UVOT Upper Limits
  9. GRB 111123A - NOT optical observations
  10. GRB 111123A, GROND observations
  11. GRB 111123A: TNG NIR detection of the afterglow candidate
  12. GRB 111123A: Swift-XRT refined Analysis
  13. GRB 111123A: MITSuME Okayama Optical upper limits
  14. GRB 111123A: Enhanced Swift-XRT position
  15. GRB 111123A: GMG optical observation
  16. GRB 111123A: Swift detection of a burst
  17. GRB 111117A, the review of the sky area in plate archives
  18. GRB 111121A: Swift/UVOT Upper Limits
  19. GRB 111121A: Magellan/Megacam observations
  20. GRB 111121A: Swift-XRT refined Analysis
  21. GRB 111121A: Swift-BAT refined analysis
  22. GRB 111117A: Chandra detection of the afterglow
  23. GRB 111121A: Enhanced Swift-XRT position
  24. GRB 111121A: Swift detection of a short hard burst
  25. GRB 111117A: Gemini Afterglow Limits
  26. GRB 111117A: optical upper limit in CrAO
  27. GRB 111117A: Fermi GBM observation
  28. GRB 111117A: TNG observations
  29. GRB 111117A: Swift/UVOT Upper Limits
  30. GRB 111117A: GROND observations
  31. GRB 111117A: Gemini host observation
  32. GRB 111117A: Swift-XRT refined Analysis
  33. GRB 111117A: NOT observations
  34. GRB 111117A: Chandra ToO observation scheduled
  35. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  36. GRB 111117A: GMG upper limit
  37. GRB 111117A: Swift detection of a short hard burst
  38. GRB111107A: ATCA observations - upper limit and a possible detection
  39. IPN Triangulation of GRB 111113A (short/hard/intense)
  40. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  41. GRB 111109A: Swift-XRT refined Analysis
  42. GRB 111109A: Swift/UVOT Photometry
  43. GRB 111109A: Swift-BAT refined analysis
  44. GRB 111109A: Enhanced Swift-XRT position
  45. GRB 111109A: Swift-XRT observations
  46. GRB 111109A: Swift detection of a burst
  47. GRB 111103B: optical upper limit of CrAO
  48. GRB 111103B: optical upper limit of Mt. Terskol observatory
  49. GRB 111107A: Fermi GBM observation
  50. Continued Skynet observations of GRB111107A
  51. GRB 111107A: Swift-XRT refined Analysis
  52. GRB 111107A: APEX submm observation
  53. GRB 111107A: Swift/UVOT Afterglow Analysis
  54. GRB 111107A: Swift-BAT refined analysis
  55. GRB 111107A: Enhanced Swift-XRT position
  56. GRB 111107A: GROND observations
  57. Skynet observations of GRB 111107A
  58. GRB 111107A: Swift detection of a burst with an optical counterpart
  59. GRB 111103B : WIYN 3.5m NIR observations
  60. GRB 111103B: Swift-XRT refined Analysis
  61. GRB 111103A: Fermi GBM observation
  62. GRB111103B Swift/UVOT Upper Limits
  63. GRB 111103B: Enhanced Swift-XRT position
  64. GRB 111103B: Swift-BAT refined analysis
  65. GRB 111103A: Swift-BAT refined analysis
  66. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  67. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  68. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  69. GRB 111029A: SAO RAS optical limits
  70. GRB 111029A: Super-LOTIS early limits
  71. All GCN Circulars available in a tarfile for data mining
  72. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  73. GRB 111029A: Swift-XRT refined Analysis
  74. GRB 111029A: PAIRITEL NIR Upper Limits
  75. GRB 111026A: Swift-BAT refined analysis
  76. GRB 111029A: Swift/UVOT Upper Limits
  77. GRB 111029A: Swift-BAT refined analysis
  78. GRB 111029A: Enhanced Swift-XRT position
  79. GRB 111029A: optical upper limit
  80. GRB 111029A: ROTSE-III Optical Limits
  81. GRB 111029A: Swift detection of a burst
  82. GRB 111026A: Swift detection of a burst
  83. GRB 111022B: 10.4m GTC z'-band observations
  84. GRB111022B: D50 optical limit
  85. GRB 111020A: Chandra Observation
  86. GRB 111022B: BTA Optical Observations
  87. GRB 111022B: Swift/UVOT upper limits
  88. GRB 111022A: Swift/UVOT Upper Limits
  89. GRB 111016A: optical upper limit
  90. GRB 111022B, Swift-BAT refined analysis
  91. GRB 111022B: Swift-XRT refined Analysis
  92. GRB 111022A: Swift-XRT refined Analysis
  93. GRB 111022B: NOT observations
  94. GRB 111022B: Enhanced Swift-XRT position
  95. GRB 111022A: Swift-BAT refined analysis
  96. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  97. GRB 111022B: Swift detection of a burst
  98. GRB 111022A: Swift detection of a burst
  99. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  100. GRB 111020A: EVLA observations

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