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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"

19685 results found.

  1. GRB 110318A: Swift-BAT refined analysis
  2. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  3. GRB 110318B: Swift detection of a burst
  4. GRB 110315A: RTT150 optical observations
  5. GRB 110315A: Swift/UVOT Upper Limits
  6. GRB 110315A: Swift-XRT refined Analysis
  7. GRB 110315A: Enhanced Swift-XRT position
  8. GRB 110315A: Swift detection of a burst
  9. GRB110312A: MITSuME Okayama Optical upper limits
  10. GRB 110312A: RTT150 optical observations
  11. GRB 110312A: Swift/UVOT Upper Limits
  12. GRB 110312A: GROND Upper Limits
  13. GRB 110312A: Enhanced Swift-XRT position
  14. GRB 110312A: Swift detection of a burst
  15. GRB 110305A: REM detection of a possible NIR afterglow
  16. GRB110305A: MITSuME Ishigakijima Optical upper limits
  17. GRB 110305A: Swift/UVOT Upper Limits
  18. GRB 110305A: Enhanced Swift-XRT position
  19. GRB 110305A: GROND Detection of Optical Afterglow
  20. GRB 110305A: Swift detection of a burst
  21. GRB 110223A: optical upper limits
  22. Swift/UVOT observations of GRB110223A
  23. No IPN GRB detected in conjunction with candidate GRB 110215
  24. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  25. Swift/UVOT observations of GRB110223b
  26. GRB 110223A : early optical limit by "Pi of the Sky"
  27. GRB 110223A: Swift-XRT refined Analysis
  28. GRB 110223A: Enhanced Swift-XRT position
  29. GRB 110223B: Enhanced Swift-XRT position
  30. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  31. GRB 110223B: Swift detection of a burst
  32. GRB 110223A: Swift detection of a burst
  33. OT 110215: Further NIR observations from NOT of the GRB candidate
  34. GRB 110213B: Swift/UVOT observations
  35. Fermi GBM detection of an SGR-like burst
  36. Swift XRT and UVOT Observations of OT 110215
  37. OT 110215: NIR observations from NOT of GRB candidate
  38. GRB 110213A: optical observations in CrAO
  39. GRB 110213B: GROND observations of the optical/NIR afterglow
  40. OT 110215: possible GRB from 2MASS J00264184+8324093
  41. Swift/UVOT observations of GRB110210a.
  42. GRB 110210A: optical upper limit
  43. GRB 110213B: Gemini South Redshift
  44. GRB 110210A: ROVOR Upper Limit
  45. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  46. GRB 110212A: Swift XRT and UVOT observations
  47. GRB 110205A: Konkoly optical observations
  48. GRB 110213B: Swift XRT observation
  49. GRB 110213A: MITSuME Akeno Optical Observation
  50. GRB 110213A: Swift-XRT refined Analysis
  51. GRB110213A: MITSuME Okayama Optical Observation
  52. GRB 110213A: Swift/UVOT refined analysis
  53. GRB 110213A: optical observations
  54. GRB 110213A: Enhanced Swift-XRT position
  55. GRB110212A: MITSuME Okayama optical upper limits
  56. GRB 110213A: P60 Optical Afterglow Detection
  57. GRB 110213A: Swift detection of a burst with optical afterglow
  58. GRB 110212A: GRT Optical Observation
  59. GRB 110212A: SARA-N Optical Limits
  60. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  61. GRB 110205A: detection of optical linear polarization from CAHA
  62. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  63. GRB 110210A: Enhanced Swift-XRT position
  64. GRB 110201A: optical observations
  65. GRB 110210A: Swift detection of a burst
  66. Fermi GBM detection of a burst from 1E 1841-045
  67. Swift/UVOT observations of GRB110208a
  68. GRB 110207A: Swift-XRT observations
  69. GRB 110208A: Enhanced Swift-XRT position
  70. GRB 110208A: Swift detection of a burst
  71. GRB 110206A: Decay of afterglow candidate
  72. GRB 110207A: TAROT Calern observatory optical observations
  73. GRB 110206A: GROND detection of afterglow candidate
  74. GRB 110206A: Swift detection of a probable X-ray afterglow
  75. GRB 110206A: TAROT La Silla observatory optical observations
  76. GRB110205A: MITSuME Ishigakijima Optical Observation
  77. GRB110205A: MITSuME Okayama Optical Observation
  78. GRB110205A: SMA 1.3mm Observations
  79. GRB 110205A: Swift/UVOT Continuing Observations
  80. Observations GRB 110205A
  81. GRB 110205A: Newcastle Observatory Optical Observations
  82. GRB 110205A: LOAO B/R Observation
  83. GRB 110205A: optical flare confirmation
  84. GRB 110205A: NOT redshift confirmation
  85. GRB 110205A: Enhanced Swift-XRT position
  86. GRB 110205A: PAIRITEL NIR Afterglow Detection
  87. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  88. GRB 110205A: TAROT Calern observatory detection of an optical flare
  89. GRB 110205A: TAROT Calern observatory optical detection
  90. GRB 110205A: Swift detection of a burst with an optical candidate
  91. GRB 110128A: Fermi GBM detection
  92. GRB110201A: MITSuME Okayama optical upper limits
  93. Swift/UVOT observations of GRB110201A
  94. GRB 110201A: Swift detection of a burst
  95. GRB110128A: MITSuME Okayama optical upper limits
  96. GRB 101112A: Maidanak and CrAO optical observations
  97. GRB110128A: TNG NIR observations
  98. GRB 110128A: Swift/UVOT observations
  99. GRB 110128A: WHT redshifts of nearby field galaxies
  100. GRB 110128A: Enhanced Swift-XRT position

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