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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"

28225 results found.

  1. GRB 111029A: TNT optical upper limit, Correction to GCN 12503
  2. GRB 111029A: Swift-XRT refined Analysis
  3. GRB 111029A: PAIRITEL NIR Upper Limits
  4. GRB 111029A: Swift/UVOT Upper Limits
  5. GRB 111029A: KAIT optical limits
  6. GRB 111029A: TNT optical upper limit
  7. GRB 111029A: Enhanced Swift-XRT position
  8. GRB 111029A: Faulkes Telescope North observations
  9. GRB 111029A: optical upper limit
  10. GRB 111029A: ROTSE-III Optical Limits
  11. GRB 111029A: Swift detection of a burst
  12. GRB 111026A: Swift detection of a burst
  13. GRB 111022B: EVLA observations - correction to GCN 12495
  14. GRB 111022B: EVLA observations
  15. GRB 111022B: 10.4m GTC z'-band observations
  16. GRB111022B: D50 optical limit
  17. GRB 111020A: Chandra Observation
  18. GRB 111022B: BTA Optical Observations
  19. GRB 111022A: MITSuME Akeno Optical upper limits
  20. GRB 111024A: MAXI/GSC detection of a burst
  21. GRB 111022B: Swift/UVOT upper limits
  22. GRB 111022A: Swift/UVOT Upper Limits
  23. GRB 111016A: optical upper limit
  24. GRB 111022B: Swift-XRT refined Analysis
  25. GRB 111022A: RIzY Observation
  26. GRB 111022A: Swift-XRT refined Analysis
  27. GRB 111022B: Gemini infrared observations
  28. GRB 111022B: MITSuME Akeno Optical upper limits
  29. GRB 111022B: NOT observations
  30. GRB 111022B: Enhanced Swift-XRT position
  31. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  32. GRB 111022B: Swift detection of a burst
  33. GRB 111022A: Swift detection of a burst
  34. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  35. GRB 111020A: EVLA observations
  36. GRB 111020A: Swift-XRT refined Analysis
  37. GRB 111020A: Gemini-South i-band observations
  38. GRB 111020A: Swift/UVOT Upper Limits
  39. GRB 111020A: Faulkes Telescope South observations
  40. GRB 111020A: Enhanced Swift-XRT position
  41. GRB 111020A: BOOTES-3 Optical Upper Limit.
  42. GRB 111020A: Swift detection of a short burst
  43. GRB 111018A: Swift/UVOT Upper Limits
  44. GRB 111018A: Swift-XRT refined Analysis
  45. GRB 111018A: GROND Upper Limits
  46. GRB 111018A: Enhanced Swift-XRT position
  47. GRB111016A : WIYN 3.5m NIR observations
  48. GRB 111018A: Swift detection of a burst
  49. GRB 111017A: Fermi GBM Detection
  50. GRB111016A: D50 optical limit
  51. GRB 111016A: Gemini Detection of the NIR Counterpart
  52. GRB 111016A: Swift/UVOT Detection of a Source
  53. GRB 111016A: P60 Afterglow Candidate
  54. GRB 111016A: MITSuME Akeno Optical upper limits
  55. GRB 111016A: Swift-XRT refined Analysis
  56. GRB 111016A: Enhanced Swift-XRT position
  57. GRB 111016A: Swift-XRT observations
  58. GRB 111016A: Swift detection of a burst
  59. EVLA 22 GHz Detection of GRB 111008A
  60. GRB 111005A: ATCA 18 GHz decay
  61. GRB 111008A: Swift/UVOT Upper Limits
  62. GRB 111008A: VLT/X-shooter spectroscopy
  63. GRB 111008A: Swift-XRT refined Analysis
  64. GRB 111008A: Gemini spectroscopic redshift
  65. GRB 111008A, GROND observations
  66. GRB 111008A: NOT optical observation
  67. GRB 111008A: Gemini optical counterpart
  68. GRB 111008A: Enhanced Swift-XRT position
  69. GRB 111008A: Swift detection of a burst
  70. GRB 111005A: ATCA 18 GHz detection
  71. GRB 111005A: ATCA radio upper limit
  72. GRB 111005A: GROND NIR observations
  73. GRB 111005A: Swift detection of a burst
  74. GRB 111003A: Fermi GBM detection
  75. GRB 110921A: MITSuME-Akeno Optical photometry
  76. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  77. GRB 110928A: Swift/UVOT Upper Limits
  78. Trigger 504307: Swift detection of MAXI J1836-194
  79. GRB 110928A: Swift-XRT refined Analysis
  80. GRB 110825A: GROND Observations
  81. GRB 110928A: Enhanced Swift-XRT position
  82. GRB 110928A: P60 Observations
  83. GRB 110928A: Further PAIRITEL NIR Observations
  84. GRB 110928A: Swift-XRT observations
  85. GRB 110928A: Swift/UVOT finding chart observation
  86. GRB 110928A: Swift detection of a burst
  87. Swift-BAT trigger 503926 is noise
  88. GRB 110924A: Swift detection of a possible burst
  89. GRB110918A: Lick Observations
  90. GRB 110921A: NOT observations
  91. GRB 110921A: TNT astrometry
  92. GRB 110921A: Swift-XRT refined Analysis
  93. GRB 110918A: Liverpool Telescope optical observations
  94. GRB 110918A: submm observations from APEX
  95. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  96. GRB 110921A: Enhanced Swift-XRT position
  97. GRB 110921A: MITSuME Akeno Optical Observation
  98. GRB 110921A : TNT optical counterpart candidate
  99. GRB 110918A: Swift-XRT refined Analysis
  100. GRB 110918A: Spectroscopy from GTC

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