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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"

28234 results found.

  1. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  2. GRB 111211A: Detection of the SN with the 10.4m GTC
  3. GRB 120102A: Fermi GBM observation
  4. GRB 111228A: optical observations in CrAO
  5. GRB 120102A: Swift-XRT refined Analysis
  6. GRB 120102A: Swift/UVOT Detection
  7. GRB 120102A: Enhanced Swift-XRT position
  8. GRB 120102A: Swift detection of a burst with an optical counterpart
  9. GRB 111225A: optical observations in CrAO
  10. GRB 111228A, optical observations
  11. GRB 111228A: LOAO Optical Observation
  12. GRB 111228A: Optical and NIR observations with Kanata telescope
  13. GRB 111228A: SMARTS optical/IR afterglow observations
  14. GRB 111229A: Swift/UVOT Detection
  15. GRB 111229A: Faulkes Telescope South observations
  16. GRB 111229A: Swift-XRT refined Analysis
  17. GRB 111229A: Enhanced Swift-XRT position
  18. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  19. GRB111228A: Further GMG observations
  20. GRB 111229A: Gemini-South Redshift
  21. GRB 111229A: GROND afterglow candidate
  22. GRB 111229A: Swift detection of a burst
  23. GRB 111228A: Liverpool Telescope Observations
  24. GRB 111225A: Lightbuckets Optical Observations
  25. GRB 111228A: P60 Observations
  26. GRB 111228A: X-shooter spectroscopy
  27. GRB 111228A: T100 observations
  28. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  29. GRB 111228A: GMG optical observation
  30. GRB 111228A: Swift-XRT refined Analysis
  31. GRB 111228A: NOT redshift
  32. GRB111228A: TNG spectroscopy analysis
  33. GRB 111228A: Gemini South Redshift
  34. GRB 111228A: PAIRITEL NIR Detection
  35. GRB 111228A: GROND observations
  36. GRB 111228A: GRAS017 optical observations
  37. GRB 111228A: IAC80 BVI-band observations
  38. GRB 111228A: Swift/UVOT Detection
  39. GRB 111228A: Skynet/Dolomiti Optical Observations
  40. GRB 111228A: NOT optical observation
  41. GRB 111228A: optical observations
  42. GRB 111228A: Enhanced Swift-XRT position
  43. GRB 111228A: TAROT Calern observatory. OT decay stopped
  44. GRB 111228A, optical observations
  45. GRB 111228A: Fermi GBM observation
  46. GRB111228A: MITSuME Okayama Optical Observation
  47. GRB 111228A: Possible host galaxy in the SDSS arhive
  48. GRB 111225A, optical observations
  49. GRB 111228A: Xinglong TNT confirms the optical afterglow
  50. GRB 111228A: Swift detection of a burst with an optical counterpart
  51. GRB 111205A: optical observations
  52. GRB 111225A: Swift/UVOT Observations
  53. GRB 111225A: Keck/LRIS Afterglow Photometry
  54. GRB 111225A: PAIRITEL NIR Upper Limits
  55. GRB111225A: MITSuME Okayama optical upper limits
  56. GRB 111225A: GRT Optical Observation
  57. GRB 111225A: 1.23m CAHA optical observations
  58. GRB 111225A: Swift-XRT refined Analysis
  59. GRBv111225A: Xinglong TNT optical afterglow
  60. GRB 111225A: Enhanced Swift-XRT position
  61. GRB 111225A: Super-LOTIS early detection
  62. GRB 111225A: TAROT Calern observatory optical detection
  63. GRB 111225A: TAROT Calern observatory optical observations
  64. GRB 111225A: Swift detection of a burst with an optical counterpart
  65. GRB 111222A: Swift/UVOT Observations
  66. GRB 111222A: Swift-XRT observations
  67. GRB 111210A: optical upper limit of Mt. Terskol observatory
  68. Trigger 510075 is not a GRB
  69. GRB 111215A: EVLA observations
  70. GRB111215A: CARMA Detection
  71. XRT GRB Catalogue now live and online
  72. GRB 111103B: optical upper limit
  73. GRB 111211A: optical ovservations at Mt. Terskol observatory
  74. GRB111215A: optical upper limit
  75. GRB 111215B: Swift/UVOT Upper Limits
  76. GRB 111215B: Swift-XRT observations
  77. GRB 111205A: Confirmation of X-ray Afterglow
  78. GRB111215A: Pre-Outburst Palomar 48 inch Imaging
  79. GRB 111215A: TNG K-band observations
  80. GRB 111215A: MITSuME Okayama Optical upper limits
  81. GRB 111215A: Swift/UVOT Upper Limits
  82. GRB 111215A: Swift-XRT refined Analysis
  83. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  84. GRB 111215A: Enhanced Swift-XRT position
  85. GRB 111215A: OSN I-band observations
  86. GRB 111215A, Optical Observations
  87. GRB 111215A: MITSuME Akeno Optical upper limits
  88. GRB 111215A: GMG optical upper limit
  89. GRB 111215A : Xinglong TNT upper limit
  90. GRB 111215A: Swift detection of a burst
  91. GRB 111212A: GROND observations
  92. GRB 111211A: Swift/UVOT Detection
  93. GRB 111211A: VLT/X-shooter redshift
  94. GRB 111211A: NOT afterglow confirmation
  95. GRB 111212A: Swift-XRT refined Analysis
  96. GRB 111211A: Swift/XRT target of opportunity observation
  97. GRB 111212A: Swift/UVOT Upper Limits
  98. GRB 111212A: Enhanced Swift-XRT position
  99. GRB 111212A: Swift-XRT observations
  100. GRB 111211A: GROND afterglow candidate

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