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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"

37715 results found.

  1. GRB 111126A Circular #12599 erratum
  2. GRB 111129A: Swift-BAT refined analysis
  3. GRB 111129A: Enhanced Swift-XRT position
  4. GRB 111129A: Swift detection of a burst with an optical counterpart
  5. GRB 111126A found in ground analysis of BAT data
  6. GRB 111123A, Swift-BAT refined analysis
  7. GRB 111123A: Swift/UVOT Upper Limits
  8. GRB 111123A - NOT optical observations
  9. GRB 111123A, GROND observations
  10. GRB 111123A: correction to GCN 12593
  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 111117A: Refined Chandra Astrometry
  17. GRB 111123A: Swift detection of a burst
  18. GRB 111117A, the review of the sky area in plate archives
  19. Konus-Wind observation of GRB 111121A
  20. GRB 111121A: Swift/UVOT Upper Limits
  21. GRB 111121A: Magellan/Megacam observations
  22. GRB 111121A: Swift-XRT refined Analysis
  23. GRB 111121A: Swift-BAT refined analysis
  24. GRB 111117A: Chandra detection of the afterglow
  25. GRB 111121A: Enhanced Swift-XRT position
  26. GRB 111121A: Swift detection of a short hard burst
  27. GRB 111117A: Gemini Afterglow Limits
  28. GRB 111117A: optical upper limit in CrAO
  29. GRB 111117A: Fermi GBM observation
  30. GRB 111117A: further NOT observations
  31. GRB 111117A: EVLA observations
  32. GRB 111117A: TNG observations
  33. GRB 111117A: Swift/UVOT Upper Limits
  34. GRB 111117A: GROND observations
  35. GRB 111117A: Gemini host observation
  36. GRB111117A: Magellan IMACS observations
  37. GRB 111117A: Swift-XRT refined Analysis
  38. GRB111107A: Further ATCA observations - no detection
  39. GRB 111117A: NOT observations
  40. GRB 111117A: Chandra ToO observation scheduled
  41. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  42. GRB 111117A: GMG upper limit
  43. GRB 111117A: Swift detection of a short hard burst
  44. GRB111107A: ATCA observations - upper limit and a possible detection
  45. Konus-Wind observation of GRB 111113A
  46. IPN Triangulation of GRB 111113A (short/hard/intense)
  47. GRB 111109A: Swift-XRT refined Analysis
  48. GRB 111109A: Swift/UVOT Photometry
  49. GRB 111109A: Swift-BAT refined analysis
  50. GRB 111109A: Enhanced Swift-XRT position
  51. GRB 111109A: Swift-XRT observations
  52. GRB 111109A: Swift detection of a burst
  53. GRB 111103B: optical upper limit of CrAO
  54. GRB 111103B: optical upper limit of Mt. Terskol observatory
  55. GRB 111107A: Fermi GBM observation
  56. Continued Skynet observations of GRB111107A
  57. GRB 111107A: Swift-XRT refined Analysis
  58. GRB 111107A: VLT/X-shooter spectroscopy
  59. GRB 111107A: APEX submm observation
  60. GRB 111107A: Swift/UVOT Afterglow Analysis
  61. GRB 111107A: Swift-BAT refined analysis
  62. GRB 111107A: Enhanced Swift-XRT position
  63. GRB 111107A: Gemini-South Redshift
  64. GRB 111107A: GROND observations
  65. Skynet observations of GRB 111107A
  66. GRB 111107A: Swift detection of a burst with an optical counterpart
  67. GRB 111103B: MITSuME Akeno Optical upper limits
  68. Konus-Wind observation of GRB 111103B
  69. GRB 111103B : WIYN 3.5m NIR observations
  70. GRB 111103B: Swift-XRT refined Analysis
  71. GRB 111103A: Fermi GBM observation
  72. GRB111103B Swift/UVOT Upper Limits
  73. GRB 111103B: optical observations from TAU, Ka-Dar
  74. GRB 111103B: Enhanced Swift-XRT position
  75. GRB 111103B: Swift-BAT refined analysis
  76. GRB 111103A: Swift-BAT refined analysis
  77. GRB 111022B: MASTER OT observations
  78. GRB 111103B: optical observations
  79. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  80. GRB 111103A: Swift detection of a burst
  81. Swift-BAT trigger 506884 is not a GRB
  82. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  83. GRB 111029A: SAO RAS optical limits
  84. GRB 111029A: Super-LOTIS early limits
  85. GRB 111026A: spectral lag value inconclusive for a short burst
  86. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  87. GRB 111029A: TNT optical upper limit, Correction to GCN 12503
  88. GRB 111029A: Swift-XRT refined Analysis
  89. GRB 111029A: PAIRITEL NIR Upper Limits
  90. GRB 111026A: Swift-BAT refined analysis
  91. GRB 111029A: Swift/UVOT Upper Limits
  92. GRB 111029A: KAIT optical limits
  93. GRB 111029A: Swift-BAT refined analysis
  94. GRB 111029A: TNT optical upper limit
  95. GRB 111029A: Enhanced Swift-XRT position
  96. GRB 111029A: Faulkes Telescope North observations
  97. GRB 111029A: optical upper limit
  98. GRB 111029A: ROTSE-III Optical Limits
  99. GRB 111029A: Swift detection of a burst
  100. GRB 111026A: Swift detection of a burst

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