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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"

20534 results found.

  1. No IPN GRB detected in conjunction with candidate GRB 110215
  2. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  3. Swift/UVOT observations of GRB110223b
  4. GRB 110223A : early optical limit by "Pi of the Sky"
  5. GRB 110223A: Enhanced Swift-XRT position
  6. GRB 110223B: Enhanced Swift-XRT position
  7. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  8. GRB 110223B: Swift detection of a burst
  9. GRB 110223A: Swift detection of a burst
  10. OT 110215: Further NIR observations from NOT of the GRB candidate
  11. GRB 110213B: Swift/UVOT observations
  12. Swift XRT and UVOT Observations of OT 110215
  13. OT 110215: NIR observations from NOT of GRB candidate
  14. GRB 110213A: optical observations in CrAO
  15. GRB 110213B: GROND observations of the optical/NIR afterglow
  16. OT 110215: possible GRB from 2MASS J00264184+8324093
  17. Swift/UVOT observations of GRB110210a.
  18. GRB 110210A: optical upper limit
  19. GRB 110210A: ROVOR Upper Limit
  20. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  21. GRB 110212A: Swift XRT and UVOT observations
  22. GRB 110205A: Konkoly optical observations
  23. GRB 110213B: Swift XRT observation
  24. GRB 110213A: MITSuME Akeno Optical Observation
  25. GRB110213A: MITSuME Okayama Optical Observation
  26. GRB 110213A: Swift/UVOT refined analysis
  27. GRB 110213B: MAXI/GSC detection of a probable GRB
  28. GRB 110213A: optical observations
  29. GRB 110213A: Enhanced Swift-XRT position
  30. GRB110212A: MITSuME Okayama optical upper limits
  31. GRB 110213A: P60 Optical Afterglow Detection
  32. GRB 110213A: Swift detection of a burst with optical afterglow
  33. GRB 110212A: GRT Optical Observation
  34. GRB 110212A: SARA-N Optical Limits
  35. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  36. GRB 110205A: detection of optical linear polarization from CAHA
  37. GRB 110210A: Enhanced Swift-XRT position
  38. GRB 110201A: optical observations
  39. GRB 110210A: Swift detection of a burst
  40. Swift/UVOT observations of GRB110208a
  41. GRB 110207A: Swift-XRT observations
  42. GRB 110208A: Enhanced Swift-XRT position
  43. GRB 110208A: Swift detection of a burst
  44. GRB 110206A: Decay of afterglow candidate
  45. GRB 110207A: TAROT Calern observatory optical observations
  46. GRB 110206A: GROND detection of afterglow candidate
  47. GRB 110206A: Swift detection of a probable X-ray afterglow
  48. GRB 110206A: TAROT La Silla observatory optical observations
  49. GRB110205A: MITSuME Ishigakijima Optical Observation
  50. GRB110205A: MITSuME Okayama Optical Observation
  51. GRB 110205A: Swift/UVOT Continuing Observations
  52. Observations GRB 110205A
  53. GRB 110205A: Newcastle Observatory Optical Observations
  54. GRB 110205A: LOAO B/R Observation
  55. GRB 110205A: optical flare confirmation
  56. GRB 110205A: NOT redshift confirmation
  57. GRB 110205A: Enhanced Swift-XRT position
  58. GRB 110205A: PAIRITEL NIR Afterglow Detection
  59. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  60. GRB 110205A: TAROT Calern observatory detection of an optical flare
  61. GRB 110205A: TAROT Calern observatory optical detection
  62. GRB 110205A: Swift detection of a burst with an optical candidate
  63. GRB110201A: MITSuME Okayama optical upper limits
  64. Swift/UVOT observations of GRB110201A
  65. GRB 110201A: Swift-BAT refined analysis
  66. GRB 110201A: Swift detection of a burst
  67. GRB110128A: MITSuME Okayama optical upper limits
  68. GRB 101112A: Maidanak and CrAO optical observations
  69. GRB110128A: TNG NIR observations
  70. GRB 110128A: TAROT-Calern refined analysis
  71. GRB 110128A: Swift/UVOT observations
  72. GRB 110128A: WHT redshifts of nearby field galaxies
  73. GRB 110128A: Enhanced Swift-XRT position
  74. GRB 110128A: Afterglow detection from NOT
  75. GRB 110128A: TAROT Calern observatory upper limits
  76. GRB 110128A: Swift detection of a burst
  77. GRB 110106B, radio observations
  78. GRB 110120A: MASTER optical observations
  79. IPN triangulation of GRB 110120A
  80. GRB 101225A: CQUEAN optical observation
  81. GRB 110106A: CrAO optical observations
  82. GRB 110112A: optical upper limit
  83. GRB110119: Swift/UVOT Detection
  84. GRB110119A: MITSuME Okayama optical upper limits
  85. GRB 110119A: Swift-BAT refined analysis
  86. GRB 110119A: PAIRITEL NIR Afterglow Detection
  87. GRB 110119A: Enhanced Swift-XRT position
  88. GRB 110119A: Swift detection of a burst with an optical detection
  89. GRB 101219B: tentative redshift and spectroscopic supernova detection
  90. GRB 101219B: GROND detection of a SN signature
  91. Swift-BAT trigger 442771 is a noise fluctuation
  92. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  93. New feature in Fermi GBM GRB Ground Position Notices
  94. Swift-BAT Trigger 442539 is not a GRB
  95. Swift Trigger 442539 is probably not a GRB
  96. Short GRB 110112B : early optical limit by "Pi of the Sky"
  97. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  98. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  99. GRB 110107A: Swift-XRT afterglow confirmation
  100. GRB 110112A: Swift/UVOT upper limits

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