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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"

21264 results found.

  1. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  2. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  3. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  4. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  5. GRB 110328A: Enhanced Swift-XRT position
  6. GRB 110328A: Swift detection of a burst
  7. GRB 110319B Swift-XRT afterglow confirmation
  8. GRB 110319B: Swift/UVOT Upper Limits
  9. GRB 110318B: Swift/UVOT Upper Limits
  10. GRB 110319B: GROND upper limits
  11. GRB 110319B: Swift-XRT afterglow candidate.
  12. GRB 110319B found in ground analysis of Swift-BAT data
  13. GRB 110319A: Swift/UVOT Detection
  14. GRB 110319A: Swift-BAT refined analysis
  15. GRB 110318B: GROND upper limits
  16. GRB 110319A: Enhanced Swift-XRT position
  17. GRB 110319A: Swift detection of a burst
  18. GRB 110318B: Swift-BAT refined analysis
  19. GRB 110318B: Enhanced Swift-XRT position
  20. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  21. GRB 110318B: Swift detection of a burst
  22. GRB 110315A: RTT150 optical observations
  23. GRB 110315A: Swift/UVOT Upper Limits
  24. GRB 110315A: Enhanced Swift-XRT position
  25. GRB 110315A: Swift detection of a burst
  26. GRB110312A: MITSuME Okayama Optical upper limits
  27. GRB 110312A: RTT150 optical observations
  28. GRB 110312A: Swift/UVOT Upper Limits
  29. GRB 110312A: GROND Upper Limits
  30. GRB 110312A: Enhanced Swift-XRT position
  31. GRB 110312A: Swift detection of a burst
  32. GRB 110305A: REM detection of a possible NIR afterglow
  33. GRB110305A: MITSuME Ishigakijima Optical upper limits
  34. GRB 110305A: Swift/UVOT Upper Limits
  35. GRB 110305A: Enhanced Swift-XRT position
  36. GRB 110305A: GROND Detection of Optical Afterglow
  37. GRB 110305A: Swift detection of a burst
  38. GRB 110223A: optical upper limits
  39. GRB 110301A: Fermi GBM detection
  40. GRB101225A: early EVLA Observations of Christmas Burst
  41. Swift/UVOT observations of GRB110223A
  42. No IPN GRB detected in conjunction with candidate GRB 110215
  43. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  44. Swift/UVOT observations of GRB110223b
  45. GRB 110223A : early optical limit by "Pi of the Sky"
  46. GRB 110223A: Enhanced Swift-XRT position
  47. GRB 110223B: Enhanced Swift-XRT position
  48. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  49. GRB 110223B: Swift detection of a burst
  50. GRB 110223A: Swift detection of a burst
  51. OT 110215: Further NIR observations from NOT of the GRB candidate
  52. GRB 110213B: Swift/UVOT observations
  53. Swift XRT and UVOT Observations of OT 110215
  54. OT 110215: NIR observations from NOT of GRB candidate
  55. GRB 110213A: optical observations in CrAO
  56. GRB 110213B: GROND observations of the optical/NIR afterglow
  57. OT 110215: possible GRB from 2MASS J00264184+8324093
  58. Swift/UVOT observations of GRB110210a.
  59. GRB 110210A: optical upper limit
  60. GRB 110210A: ROVOR Upper Limit
  61. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  62. GRB 110212A: Swift XRT and UVOT observations
  63. GRB 110205A: Konkoly optical observations
  64. GRB 110213B: Swift XRT observation
  65. GRB 110213A: MITSuME Akeno Optical Observation
  66. Konus-Wind observation of GRB 110213A
  67. Konus-Wind observation of GRB 110213B
  68. GRB110213A: MITSuME Okayama Optical Observation
  69. GRB 110213A: Swift/UVOT refined analysis
  70. GRB 110213A, Swift-BAT refined analysis
  71. GRB 110213A: optical observations
  72. GRB 110213A: Enhanced Swift-XRT position
  73. GRB110212A: MITSuME Okayama optical upper limits
  74. GRB 110213A: P60 Optical Afterglow Detection
  75. GRB 110213A: Swift detection of a burst with optical afterglow
  76. GRB 110212A: GRT Optical Observation
  77. GRB 110212A: SARA-N Optical Limits
  78. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  79. GRB 110205A: detection of optical linear polarization from CAHA
  80. GRB 110207A: Suzaku WAM observation of the prompt emission
  81. GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
  82. GRB 110210A: Enhanced Swift-XRT position
  83. GRB 110201A: optical observations
  84. GRB 110210A: Swift detection of a burst
  85. Swift/UVOT observations of GRB110208a
  86. GRB 110205A: Suzaku WAM observation of the prompt emission
  87. GRB 110207A: Swift-XRT observations
  88. GRB 110208A: Enhanced Swift-XRT position
  89. GRB 110208A: Swift detection of a burst
  90. GRB 110206A: Decay of afterglow candidate
  91. GRB 110207A: TAROT Calern observatory optical observations
  92. GRB 110206A: GROND detection of afterglow candidate
  93. Konus-Wind observation of GRB 110205A
  94. GRB 110206A: Swift detection of a probable X-ray afterglow
  95. GRB 110206A: TAROT La Silla observatory optical observations
  96. GRB110205A: MITSuME Ishigakijima Optical Observation
  97. GRB110205A: MITSuME Okayama Optical Observation
  98. GRB 110205A: Swift/UVOT Continuing Observations
  99. GRB 110205A: Lulin optical observations and temporal decay index
  100. Observations GRB 110205A

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