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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"

45437 results found.

  1. GRB 111215A: GMG optical upper limit
  2. GRB 111215A : Xinglong TNT upper limit
  3. GRB 111215A: Swift detection of a burst
  4. GRB 111201A, the review of the sky area in plate archive
  5. GRB 111212A: GROND observations
  6. GRB 111211A: Swift/UVOT Detection
  7. GRB 111211A: VLT/X-shooter redshift
  8. Konus-Wind observation of GRB 111211A
  9. GRB 111211A: NOT afterglow confirmation
  10. GRB 111212A: Swift-XRT refined Analysis
  11. GRB 111211A: Swift/XRT target of opportunity observation
  12. GRB 111212A: Swift/UVOT Upper Limits
  13. GRB 111212A: Swift-BAT refined analysis
  14. GRB 111212A: Enhanced Swift-XRT position
  15. GRB 111212A: Swift-XRT observations
  16. GRB 111211A: GROND afterglow candidate
  17. GRB 111212A: Swift detection of a burst
  18. GRB 111211A: SuperAGILE localization of a long GRB
  19. GRB 111210A: Xinglong TNT upper limit
  20. GRB 111209A - ATCA 34GHz upper limit
  21. Konus-Wind observation of GRB 111209A
  22. GRB 111210A: GROND observations
  23. GRB 111210A: SDSS prior imaging
  24. GRB 111210A: Swift-XRT refined Analysis
  25. GRB 111210A: MITSuME Okayama Optical upper limits
  26. GRB 111208A: Swift-XRT refined analysis
  27. GRB 111210A: Gemini-North candidate counterpart
  28. GRB 111209A: Rebrightening seen by GROND
  29. GRB111210A: MITSuME Okayama J-band upper-limit
  30. GRB 111210A: Swift/UVOT Upper Limits
  31. GRB 111210A: Enhanced Swift-XRT position
  32. GRB 111210A: Swift-BAT refined analysis
  33. GRB 111210A: Swift detection of a burst
  34. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  35. GRB 111209A: VLT/X-shooter redshift
  36. GRB 111209A: GROND Afterglow observations
  37. GRB 111209A optical limit by "Pi of the Sky"
  38. GRB 111209A: PROMPT optical observations of early afterglow
  39. GRB 111208A: Lightbuckets Optical Observations
  40. GRB 111209A: Swift-XRT refined Analysis
  41. GRB 111209A: Swift UVOT refined analysis
  42. GRB 111209A: Swift Burst of Interest
  43. GRB 111209A, Swift-BAT refined analysis
  44. GRB 111209A: Enhanced Swift-XRT position
  45. GRB111209A : planned XMM-Newton observation
  46. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  47. GRB 111205A: GROND observations
  48. GRB 111209A: Faulkes Telescope North observations
  49. GRB 111209A: REM NIR detection
  50. GRB 111209A: TAROT La Silla observatory optical detection
  51. GRB 111209A: Swift detection of a long burst with an optical counterpart
  52. GRB 111208A: Swift XRT/UVOT observations
  53. GRB 111205A: Swift XRT Observations
  54. GRB 111207A found in ground analysis of BAT data
  55. GRB 111208A found in ground analysis of BAT data
  56. Konus-Wind observation of GRB 111205A
  57. IPN Triangulation of GRB 111205A (long/hard/intense)
  58. GRB 111117A: Refined GMG observation
  59. GRB 111204A: TNG NIR observations
  60. GRB 111201A: GMG optical observation
  61. GRB 111204A: GROND Observations
  62. GRB 111204A: Swift-XRT refined Analysis
  63. GRB 111204A, Swift-BAT refined analysis
  64. GRB 111022B: CrAO optical limit
  65. GRB 111204A: Swift/UVOT Upper Limits
  66. GRB 110921A: optical observations in Maidanak observatory
  67. GRB 111204A: MASTER optical observations
  68. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  69. GRB 111204A: Enhanced Swift-XRT position
  70. GRB 111123A: optical upper limit in CrAO
  71. GRB 111204A: Swift detection of a burst
  72. GRB 111201A: Confirmation of the X-ray afterglow
  73. GRB 111201A: Swift/UVOT Upper Limits
  74. GRB111201A: Swift-XRT observations
  75. GRB 111201A found in ground analysis of BAT data
  76. GRB 111121A: Suzaku WAM observation of the prompt emission
  77. GRB 111129A: Swift/UVOT Detection
  78. GRB 111129A, GROND afterglow observations
  79. GRB 111129A: Swift-XRT refined Analysis
  80. GRB 111126A Circular #12599 erratum
  81. GRB 111129A: Swift-BAT refined analysis
  82. GRB 111129A: Enhanced Swift-XRT position
  83. GRB 111129A: Swift detection of a burst with an optical counterpart
  84. GRB 111126A found in ground analysis of BAT data
  85. GRB 111123A, Swift-BAT refined analysis
  86. GRB 111123A: Swift/UVOT Upper Limits
  87. GRB 111123A - NOT optical observations
  88. GRB 111123A, GROND observations
  89. GRB 111123A: correction to GCN 12593
  90. GRB 111123A: TNG NIR detection of the afterglow candidate
  91. GRB 111123A: Swift-XRT refined Analysis
  92. GRB 111123A: MITSuME Okayama Optical upper limits
  93. GRB 111123A: Enhanced Swift-XRT position
  94. GRB 111123A: GMG optical observation
  95. GRB 111117A: Refined Chandra Astrometry
  96. GRB 111123A: Swift detection of a burst
  97. GRB 111117A, the review of the sky area in plate archives
  98. Konus-Wind observation of GRB 111121A
  99. GRB 111121A: Swift/UVOT Upper Limits
  100. GRB 111121A: Magellan/Megacam observations

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