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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

23410 results found.

  1. GRB 111212A: Enhanced Swift-XRT position
  2. GRB 111212A: Swift-XRT observations
  3. GRB 111211A: GROND afterglow candidate
  4. GRB 111212A: Swift detection of a burst
  5. GRB 111211A: SuperAGILE localization of a long GRB
  6. Konus-Wind observation of GRB 111209A
  7. GRB 111210A: GROND observations
  8. GRB 111210A: SDSS prior imaging
  9. GRB 111210A: MITSuME Okayama Optical upper limits
  10. GRB 111208A: Swift-XRT refined analysis
  11. GRB 111210A: Gemini-North candidate counterpart
  12. GRB111210A: MITSuME Okayama J-band upper-limit
  13. GRB 111210A: Swift/UVOT Upper Limits
  14. GRB 111210A: Enhanced Swift-XRT position
  15. GRB 111210A: Swift detection of a burst
  16. GRB 111209A: GROND Afterglow observations
  17. GRB 111209A optical limit by "Pi of the Sky"
  18. GRB 111209A: PROMPT optical observations of early afterglow
  19. GRB 111208A: Lightbuckets Optical Observations
  20. GRB 111209A: Swift UVOT refined analysis
  21. GRB 111209A: Swift Burst of Interest
  22. GRB 111209A: Enhanced Swift-XRT position
  23. GRB 111205A: GROND observations
  24. GRB 111209A: REM NIR detection
  25. GRB 111209A: TAROT La Silla observatory optical detection
  26. GRB 111209A: Swift detection of a long burst with an optical counterpart
  27. GRB 111208A: Swift XRT/UVOT observations
  28. GRB 111205A: Swift XRT Observations
  29. GRB 111207A found in ground analysis of BAT data
  30. IPN Triangulation of GRB 111205A (long/hard/intense)
  31. GRB 111204A: TNG NIR observations
  32. GRB 111201A: GMG optical observation
  33. GRB 111204A: GROND Observations
  34. GRB 111022B: CrAO optical limit
  35. GRB 111204A: Swift/UVOT Upper Limits
  36. GRB 110921A: optical observations in Maidanak observatory
  37. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  38. GRB 111204A: Enhanced Swift-XRT position
  39. GRB 111123A: optical upper limit in CrAO
  40. GRB 111204A: Swift detection of a burst
  41. GRB 111201A: Confirmation of the X-ray afterglow
  42. GRB 111201A: Swift/UVOT Upper Limits
  43. GRB 111129A: Swift/UVOT Detection
  44. GRB 111129A, GROND afterglow observations
  45. GRB 111129A: Enhanced Swift-XRT position
  46. GRB 111129A: Swift detection of a burst with an optical counterpart
  47. GRB 111126A found in ground analysis of BAT data
  48. GRB 111123A: Swift/UVOT Upper Limits
  49. GRB 111123A - NOT optical observations
  50. GRB 111123A, GROND observations
  51. GRB 111123A: TNG NIR detection of the afterglow candidate
  52. GRB 111123A: MITSuME Okayama Optical upper limits
  53. GRB 111123A: Enhanced Swift-XRT position
  54. GRB 111123A: GMG optical observation
  55. GRB 111123A: Swift detection of a burst
  56. GRB 111121A: Swift/UVOT Upper Limits
  57. GRB 111121A: Magellan/Megacam observations
  58. GRB 111117A: Chandra detection of the afterglow
  59. GRB 111121A: Enhanced Swift-XRT position
  60. GRB 111121A: Swift detection of a short hard burst
  61. GRB 111117A: Gemini Afterglow Limits
  62. GRB 111117A: optical upper limit in CrAO
  63. GRB 111117A: EVLA observations
  64. GRB 111117A: TNG observations
  65. GRB 111117A: Swift/UVOT Upper Limits
  66. GRB 111117A: GROND observations
  67. GRB 111117A: Gemini host observation
  68. GRB 111117A: Swift-XRT refined Analysis
  69. GRB 111117A: NOT observations
  70. GRB 111117A: Chandra ToO observation scheduled
  71. GRB 111117A: GMG upper limit
  72. GRB 111117A: Swift detection of a short hard burst
  73. GRB111107A: ATCA observations - upper limit and a possible detection
  74. IPN Triangulation of GRB 111113A (short/hard/intense)
  75. GRB 111109A: Swift/UVOT Photometry
  76. GRB 111109A: Enhanced Swift-XRT position
  77. GRB 111109A: Swift-XRT observations
  78. GRB 111109A: Swift detection of a burst
  79. GRB 111103B: optical upper limit of CrAO
  80. GRB 111103B: optical upper limit of Mt. Terskol observatory
  81. Continued Skynet observations of GRB111107A
  82. GRB 111107A: APEX submm observation
  83. GRB 111107A: Swift/UVOT Afterglow Analysis
  84. GRB 111107A: Enhanced Swift-XRT position
  85. GRB 111107A: GROND observations
  86. Skynet observations of GRB 111107A
  87. GRB 111107A: Swift detection of a burst with an optical counterpart
  88. GRB 111103B : WIYN 3.5m NIR observations
  89. GRB111103B Swift/UVOT Upper Limits
  90. GRB 111103B: optical observations from TAU, Ka-Dar
  91. GRB 111103B: Enhanced Swift-XRT position
  92. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  93. GRB 111022B: MASTER OT observations
  94. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  95. GRB 111103A: Swift detection of a burst
  96. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  97. GRB 111029A: SAO RAS optical limits
  98. GRB 111029A: Super-LOTIS early limits
  99. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  100. GRB 111029A: PAIRITEL NIR Upper Limits

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