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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"

45424 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. GRB 111210A: Xinglong TNT upper limit
  7. GRB 111209A - ATCA 34GHz upper limit
  8. Konus-Wind observation of GRB 111209A
  9. GRB 111210A: GROND observations
  10. GRB 111210A: SDSS prior imaging
  11. GRB 111210A: Swift-XRT refined Analysis
  12. GRB 111210A: MITSuME Okayama Optical upper limits
  13. GRB 111208A: Swift-XRT refined analysis
  14. GRB 111210A: Gemini-North candidate counterpart
  15. GRB 111209A: Rebrightening seen by GROND
  16. GRB111210A: MITSuME Okayama J-band upper-limit
  17. GRB 111210A: Swift/UVOT Upper Limits
  18. GRB 111210A: Enhanced Swift-XRT position
  19. GRB 111210A: Swift-BAT refined analysis
  20. GRB 111210A: Swift detection of a burst
  21. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  22. GRB 111209A: VLT/X-shooter redshift
  23. GRB 111209A: GROND Afterglow observations
  24. GRB 111209A optical limit by "Pi of the Sky"
  25. GRB 111209A: PROMPT optical observations of early afterglow
  26. GRB 111208A: Lightbuckets Optical Observations
  27. GRB 111209A: Swift-XRT refined Analysis
  28. GRB 111209A: Swift UVOT refined analysis
  29. GRB 111209A: Swift Burst of Interest
  30. GRB 111209A, Swift-BAT refined analysis
  31. GRB 111209A: Enhanced Swift-XRT position
  32. GRB111209A : planned XMM-Newton observation
  33. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  34. GRB 111205A: GROND observations
  35. GRB 111209A: Faulkes Telescope North observations
  36. GRB 111209A: REM NIR detection
  37. GRB 111209A: TAROT La Silla observatory optical detection
  38. GRB 111209A: Swift detection of a long burst with an optical counterpart
  39. GRB 111208A: Swift XRT/UVOT observations
  40. GRB 111205A: Swift XRT Observations
  41. GRB 111207A found in ground analysis of BAT data
  42. GRB 111208A found in ground analysis of BAT data
  43. Konus-Wind observation of GRB 111205A
  44. IPN Triangulation of GRB 111205A (long/hard/intense)
  45. GRB 111117A: Refined GMG observation
  46. GRB 111204A: TNG NIR observations
  47. GRB 111201A: GMG optical observation
  48. GRB 111204A: GROND Observations
  49. GRB 111204A: Swift-XRT refined Analysis
  50. GRB 111204A, Swift-BAT refined analysis
  51. GRB 111022B: CrAO optical limit
  52. GRB 111204A: Swift/UVOT Upper Limits
  53. GRB 110921A: optical observations in Maidanak observatory
  54. GRB 111204A: MASTER optical observations
  55. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  56. GRB 111204A: Enhanced Swift-XRT position
  57. GRB 111123A: optical upper limit in CrAO
  58. GRB 111204A: Swift detection of a burst
  59. GRB 111201A: Confirmation of the X-ray afterglow
  60. GRB 111201A: Swift/UVOT Upper Limits
  61. GRB111201A: Swift-XRT observations
  62. GRB 111201A found in ground analysis of BAT data
  63. GRB 111121A: Suzaku WAM observation of the prompt emission
  64. GRB 111129A: Swift/UVOT Detection
  65. GRB 111129A, GROND afterglow observations
  66. GRB 111129A: Swift-XRT refined Analysis
  67. GRB 111126A Circular #12599 erratum
  68. GRB 111129A: Swift-BAT refined analysis
  69. GRB 111129A: Enhanced Swift-XRT position
  70. GRB 111129A: Swift detection of a burst with an optical counterpart
  71. GRB 111126A found in ground analysis of BAT data
  72. GRB 111123A, Swift-BAT refined analysis
  73. GRB 111123A: Swift/UVOT Upper Limits
  74. GRB 111123A - NOT optical observations
  75. GRB 111123A, GROND observations
  76. GRB 111123A: correction to GCN 12593
  77. GRB 111123A: TNG NIR detection of the afterglow candidate
  78. GRB 111123A: Swift-XRT refined Analysis
  79. GRB 111123A: MITSuME Okayama Optical upper limits
  80. GRB 111123A: Enhanced Swift-XRT position
  81. GRB 111123A: GMG optical observation
  82. GRB 111117A: Refined Chandra Astrometry
  83. GRB 111123A: Swift detection of a burst
  84. GRB 111117A, the review of the sky area in plate archives
  85. Konus-Wind observation of GRB 111121A
  86. GRB 111121A: Swift/UVOT Upper Limits
  87. GRB 111121A: Magellan/Megacam observations
  88. GRB 111121A: Swift-XRT refined Analysis
  89. GRB 111121A: Swift-BAT refined analysis
  90. GRB 111117A: Chandra detection of the afterglow
  91. GRB 111121A: Enhanced Swift-XRT position
  92. GRB 111121A: Swift detection of a short hard burst
  93. GRB 111117A: Gemini Afterglow Limits
  94. GRB 111117A: optical upper limit in CrAO
  95. GRB 111117A: Fermi GBM observation
  96. GRB 111117A: further NOT observations
  97. GRB 111117A: EVLA observations
  98. GRB 111117A: TNG observations
  99. GRB 111117A: Swift/UVOT Upper Limits
  100. GRB 111117A: GROND observations

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