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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"

28247 results found.

  1. GRB 111103B: optical upper limit of Mt. Terskol observatory
  2. GRB 111107A: Swift-XRT refined Analysis
  3. GRB 111107A: VLT/X-shooter spectroscopy
  4. GRB 111107A: APEX submm observation
  5. GRB 111107A: Swift/UVOT Afterglow Analysis
  6. GRB 111107A: Swift-BAT refined analysis
  7. GRB 111107A: Enhanced Swift-XRT position
  8. GRB 111107A: Gemini-South Redshift
  9. GRB 111107A: GROND observations
  10. GRB 111107A: Swift detection of a burst with an optical counterpart
  11. GRB 111103B: MITSuME Akeno Optical upper limits
  12. GRB 111103B : WIYN 3.5m NIR observations
  13. GRB 111103B: Swift-XRT refined Analysis
  14. GRB111103B Swift/UVOT Upper Limits
  15. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  16. GRB 111103B: Enhanced Swift-XRT position
  17. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  18. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  19. GRB 111103A: Swift detection of a burst
  20. GRB 111029A: SAO RAS optical limits
  21. GRB 111029A: Super-LOTIS early limits
  22. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  23. GRB 111029A: TNT optical upper limit, Correction to GCN 12503
  24. GRB 111029A: Swift-XRT refined Analysis
  25. GRB 111029A: PAIRITEL NIR Upper Limits
  26. GRB 111029A: Swift/UVOT Upper Limits
  27. GRB 111029A: KAIT optical limits
  28. GRB 111029A: TNT optical upper limit
  29. GRB 111029A: Enhanced Swift-XRT position
  30. GRB 111029A: Faulkes Telescope North observations
  31. GRB 111029A: optical upper limit
  32. GRB 111029A: ROTSE-III Optical Limits
  33. GRB 111029A: Swift detection of a burst
  34. GRB 111026A: Swift detection of a burst
  35. GRB 111022B: EVLA observations - correction to GCN 12495
  36. GRB 111022B: EVLA observations
  37. GRB 111022B: 10.4m GTC z'-band observations
  38. GRB111022B: D50 optical limit
  39. GRB 111020A: Chandra Observation
  40. GRB 111022B: BTA Optical Observations
  41. GRB 111022A: MITSuME Akeno Optical upper limits
  42. GRB 111024A: MAXI/GSC detection of a burst
  43. GRB 111022B: Swift/UVOT upper limits
  44. GRB 111022A: Swift/UVOT Upper Limits
  45. GRB 111016A: optical upper limit
  46. GRB 111022B: Swift-XRT refined Analysis
  47. GRB 111022A: RIzY Observation
  48. GRB 111022A: Swift-XRT refined Analysis
  49. GRB 111022B: Gemini infrared observations
  50. GRB 111022B: MITSuME Akeno Optical upper limits
  51. GRB 111022B: NOT observations
  52. GRB 111022B: Enhanced Swift-XRT position
  53. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  54. GRB 111022B: Swift detection of a burst
  55. GRB 111022A: Swift detection of a burst
  56. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  57. GRB 111020A: EVLA observations
  58. GRB 111020A: Swift-XRT refined Analysis
  59. GRB 111020A: Gemini-South i-band observations
  60. GRB 111020A: Swift/UVOT Upper Limits
  61. GRB 111020A: Faulkes Telescope South observations
  62. GRB 111020A: Enhanced Swift-XRT position
  63. GRB 111020A: BOOTES-3 Optical Upper Limit.
  64. GRB 111020A: Swift detection of a short burst
  65. GRB 111018A: Swift/UVOT Upper Limits
  66. GRB 111018A: Swift-XRT refined Analysis
  67. GRB 111018A: GROND Upper Limits
  68. GRB 111018A: Enhanced Swift-XRT position
  69. GRB111016A : WIYN 3.5m NIR observations
  70. GRB 111018A: Swift detection of a burst
  71. GRB 111017A: Fermi GBM Detection
  72. GRB111016A: D50 optical limit
  73. GRB 111016A: Gemini Detection of the NIR Counterpart
  74. GRB 111016A: Swift/UVOT Detection of a Source
  75. GRB 111016A: P60 Afterglow Candidate
  76. GRB 111016A: MITSuME Akeno Optical upper limits
  77. GRB 111016A: Swift-XRT refined Analysis
  78. GRB 111016A: Enhanced Swift-XRT position
  79. GRB 111016A: Swift-XRT observations
  80. GRB 111016A: Swift detection of a burst
  81. EVLA 22 GHz Detection of GRB 111008A
  82. GRB 111005A: ATCA 18 GHz decay
  83. GRB 111008A: Swift/UVOT Upper Limits
  84. GRB 111008A: VLT/X-shooter spectroscopy
  85. GRB 111008A: Swift-XRT refined Analysis
  86. GRB 111008A: Gemini spectroscopic redshift
  87. GRB 111008A, GROND observations
  88. GRB 111008A: NOT optical observation
  89. GRB 111008A: Gemini optical counterpart
  90. GRB 111008A: Enhanced Swift-XRT position
  91. GRB 111008A: Swift detection of a burst
  92. GRB 111005A: ATCA 18 GHz detection
  93. GRB 111005A: ATCA radio upper limit
  94. GRB 111005A: GROND NIR observations
  95. GRB 111005A: Swift detection of a burst
  96. GRB 111003A: Fermi GBM detection
  97. GRB 110921A: MITSuME-Akeno Optical photometry
  98. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  99. GRB 110928A: Swift/UVOT Upper Limits
  100. Trigger 504307: Swift detection of MAXI J1836-194

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