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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"

27603 results found.

  1. GRB 110206A: GROND detection of afterglow candidate
  2. GRB 110207A: Swift-BAT refined analysis
  3. GRB 110206A: UVOT detection of afterglow candidate
  4. GRB 110207A: MASTER prompt and early optical observations
  5. Konus-Wind observation of GRB 110205A
  6. GRB 110207A: Swift detection of a burst
  7. GRB 110206A: Swift detection of a probable X-ray afterglow
  8. GRB 110206A: TAROT La Silla observatory optical observations
  9. GRB 110205A: Lightbuckets Optical Observations
  10. GRB 110205A: Swift/UVOT Continuing Observations
  11. Observations GRB 110205A
  12. GRB 110205A: Swift-BAT refined analysis
  13. GRB 110205A: Newcastle Observatory Optical Observations
  14. GRB 110205A: Swift-XRT refined Analysis
  15. GRB 110205A: PAIRITEL NIR Afterglow Detection
  16. GRB 110205A: TAROT Calern observatory detection of an optical flare
  17. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  18. GRB 110205A: TAROT Calern observatory optical detection
  19. GRB 110205A: Swift detection of a burst with an optical candidate
  20. GRB 110128A: Fermi GBM detection
  21. GRB 110201A: Swift-XRT refined Analysis
  22. Swift/UVOT observations of GRB110201A
  23. GRB 110201A: Swift-BAT refined analysis
  24. GRB 110201A: Swift detection of a burst
  25. GRB 110125A: Fermi GBM detection
  26. GRB 110128A, Swift-BAT refined analysis
  27. GRB 110128A: Swift/UVOT observations
  28. GRB 110128A: Swift-XRT refined Analysis
  29. GRB 110120A: Suzaku WAM observation of the prompt emission
  30. GRB 110128A: TAROT Calern observatory upper limits
  31. GRB 110128A: Swift detection of a burst
  32. Konus-Wind observation of GRB 110120A
  33. GRB 110123A: Fermi GBM detection
  34. GRB 110120A: MASTER optical observations
  35. GRB 110120A: Fermi LAT detection
  36. IPN triangulation of GRB 110120A
  37. GRB 110119A: Fermi GBM detection
  38. GRB 110120A: Fermi GBM detection
  39. GRB 110119A: Suzaku WAM observation of the prompt emission
  40. GRB110119: Swift/UVOT Detection
  41. GRB 110119A: Swift-XRT refined Analysis
  42. GRB 110119A: Swift-BAT refined analysis
  43. GRB 110119A: PAIRITEL NIR Afterglow Detection
  44. GRB 110119A: Swift detection of a burst with an optical detection
  45. Swift-BAT trigger 442771 is a noise fluctuation
  46. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  47. New feature in Fermi GBM GRB Ground Position Notices
  48. Swift-BAT Trigger 442539 is not a GRB
  49. Swift Trigger 442539 is probably not a GRB
  50. GRB101225A - timing analysis
  51. GRB 110112B: Fermi GBM observation
  52. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  53. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  54. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  55. GRB 110112A: Swift-XRT refined Analysis
  56. GRB 110112A: Swift/UVOT upper limits
  57. GRB 110112A: Swift-BAT refined analysis
  58. GRB 110112A: Swift detection of a possible short burst
  59. GRB 110107A: Swift-XRT Afterglow Candidate
  60. GRB 110107A: Swift-BAT refined analysis
  61. GRB 110107A detected in ground analysis of BAT slew data
  62. GRB 110106B: Fermi GBM detection
  63. Short GRB 110106A: MASTER OT observations
  64. GRB 110106B: Swift-XRT refined Analysis
  65. GRB 110106B: Liverpool Telescope observations
  66. GRB 110106B: Swift-BAT refined analysis
  67. GRB 110106A: Swift/UVOT Upper Limits
  68. GRB 110106A: Swift-XRT refined Analysis
  69. GRB 110106A: Swift-BAT refined analysis
  70. GRB 110106B: Swift detection of a burst
  71. GRB 110106A: MASTER optical observations
  72. GRB 101225A: Keck redshift
  73. GRB 110106A: Swift detection of a burst
  74. GRB 101225A: Host galaxy
  75. GRB 110102A: Swift-XRT refined Analysis
  76. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  77. Konus-Wind observation of GRB 110102A
  78. GRB110102A: Swift/UVOT observations
  79. GRB 110102A: Fermi GBM observation
  80. GRB 110102A: Swift-BAT refined analysis
  81. GRB 110102A: Swift detection of a burst with an optical detection
  82. GRB 101225A: optical break from NOT observation
  83. GRB 101225A: P60 Observations
  84. GRB 101225A: MAXI/GSC observations
  85. GRB 101225A Late-time emission observed by Swift-BAT
  86. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  87. GRB 101225A, Swift-BAT refined analysis
  88. GRB 101225A: Swift/UVOT Detection
  89. GRB 101225A: Swift-XRT refined Analysis
  90. Trigger 441015 / GRB 101225A: Further NOT optical observation
  91. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  92. GRB 101225A (Swift trigger 441015): optical upper limit
  93. Trigger 441015: Swift detection of a possible burst or transient
  94. GRB 101224A: NOT optical observation
  95. GRB 101224A: Swift/UVOT Upper Limits
  96. GRB 101224A: Fermi GBM observation
  97. GRB 101224A: Swift-XRT refined Analysis
  98. GRB 101224A, Swift-BAT refined analysis
  99. GRB 101224A - UVOT-enhanced XRT position
  100. GRB 101224A: Swift detection of a short burst

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