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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"

44399 results found.

  1. GRB 111208A: Lightbuckets Optical Observations
  2. GRB 111209A: Swift-XRT refined Analysis
  3. GRB 111209A: Swift UVOT refined analysis
  4. GRB 111209A: Swift Burst of Interest
  5. GRB 111209A, Swift-BAT refined analysis
  6. GRB 111209A: Enhanced Swift-XRT position
  7. GRB111209A : planned XMM-Newton observation
  8. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  9. GRB 111205A: GROND observations
  10. GRB 111209A: Faulkes Telescope North observations
  11. GRB 111209A: REM NIR detection
  12. GRB 111209A: TAROT La Silla observatory optical detection
  13. GRB 111209A: Swift detection of a long burst with an optical counterpart
  14. GRB 111208A: Swift XRT/UVOT observations
  15. GRB 111205A: Swift XRT Observations
  16. GRB 111207A found in ground analysis of BAT data
  17. GRB 111208A found in ground analysis of BAT data
  18. Konus-Wind observation of GRB 111205A
  19. IPN Triangulation of GRB 111205A (long/hard/intense)
  20. GRB 111117A: Refined GMG observation
  21. GRB 111204A: TNG NIR observations
  22. GRB 111201A: GMG optical observation
  23. GRB 111204A: GROND Observations
  24. GRB 111204A: Swift-XRT refined Analysis
  25. GRB 111204A, Swift-BAT refined analysis
  26. GRB 111022B: CrAO optical limit
  27. GRB 111204A: Swift/UVOT Upper Limits
  28. GRB 110921A: optical observations in Maidanak observatory
  29. GRB 111204A: MASTER optical observations
  30. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  31. GRB 111204A: Enhanced Swift-XRT position
  32. GRB 111123A: optical upper limit in CrAO
  33. GRB 111204A: Swift detection of a burst
  34. GRB 111201A: Confirmation of the X-ray afterglow
  35. GRB 111201A: Swift/UVOT Upper Limits
  36. GRB111201A: Swift-XRT observations
  37. GRB 111201A found in ground analysis of BAT data
  38. GRB 111121A: Suzaku WAM observation of the prompt emission
  39. GRB 111129A: Swift/UVOT Detection
  40. GRB 111129A, GROND afterglow observations
  41. GRB 111129A: Swift-XRT refined Analysis
  42. GRB 111126A Circular #12599 erratum
  43. GRB 111129A: Swift-BAT refined analysis
  44. GRB 111129A: Enhanced Swift-XRT position
  45. GRB 111129A: Swift detection of a burst with an optical counterpart
  46. GRB 111126A found in ground analysis of BAT data
  47. GRB 111123A, Swift-BAT refined analysis
  48. GRB 111123A: Swift/UVOT Upper Limits
  49. GRB 111123A - NOT optical observations
  50. GRB 111123A, GROND observations
  51. GRB 111123A: correction to GCN 12593
  52. GRB 111123A: TNG NIR detection of the afterglow candidate
  53. GRB 111123A: Swift-XRT refined Analysis
  54. GRB 111123A: MITSuME Okayama Optical upper limits
  55. GRB 111123A: Enhanced Swift-XRT position
  56. GRB 111123A: GMG optical observation
  57. GRB 111117A: Refined Chandra Astrometry
  58. GRB 111123A: Swift detection of a burst
  59. GRB 111117A, the review of the sky area in plate archives
  60. Konus-Wind observation of GRB 111121A
  61. GRB 111121A: Swift/UVOT Upper Limits
  62. GRB 111121A: Magellan/Megacam observations
  63. GRB 111121A: Swift-XRT refined Analysis
  64. GRB 111121A: Swift-BAT refined analysis
  65. GRB 111117A: Chandra detection of the afterglow
  66. GRB 111121A: Enhanced Swift-XRT position
  67. GRB 111121A: Swift detection of a short hard burst
  68. GRB 111117A: Gemini Afterglow Limits
  69. GRB 111117A: optical upper limit in CrAO
  70. GRB 111117A: Fermi GBM observation
  71. GRB 111117A: further NOT observations
  72. GRB 111117A: EVLA observations
  73. GRB 111117A: TNG observations
  74. GRB 111117A: Swift/UVOT Upper Limits
  75. GRB 111117A: GROND observations
  76. GRB 111117A: Gemini host observation
  77. GRB111117A: Magellan IMACS observations
  78. GRB 111117A: Swift-XRT refined Analysis
  79. GRB111107A: Further ATCA observations - no detection
  80. GRB 111117A: NOT observations
  81. GRB 111117A: Chandra ToO observation scheduled
  82. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  83. GRB 111117A: GMG upper limit
  84. GRB 111117A: Swift detection of a short hard burst
  85. GRB111107A: ATCA observations - upper limit and a possible detection
  86. Konus-Wind observation of GRB 111113A
  87. IPN Triangulation of GRB 111113A (short/hard/intense)
  88. XRF 111111A/MAXI J0158-744: MAXI GSC refined analysis
  89. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  90. GRB 111109A: Swift-XRT refined Analysis
  91. GRB 111109A: Swift/UVOT Photometry
  92. GRB 111109A: Swift-BAT refined analysis
  93. GRB 111109A: Enhanced Swift-XRT position
  94. GRB 111109A: Swift-XRT observations
  95. GRB 111109A: Swift detection of a burst
  96. GRB 111103B: optical upper limit of CrAO
  97. GRB 111103B: optical upper limit of Mt. Terskol observatory
  98. GRB 111107A: Fermi GBM observation
  99. Continued Skynet observations of GRB111107A
  100. GRB 111107A: Swift-XRT refined Analysis

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