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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"

36315 results found.

  1. XRF 080109 in NGC2770: Detectable Superluminal Motion
  2. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  3. Transient in NGC 2770: spectroscopic evidence for a SN
  4. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  5. GRB 071227: Suzaku WAM observation of the prompt emission
  6. GRB 071227: optical afterglow
  7. Further Swift-BAT analysis of GRB 071227
  8. Konus-Wind observation of GRB 071227
  9. GRB 071227: Magellan redshift confirmation
  10. GRB 071227: Swift-XRT refined analysis
  11. GRB 071227: VLT probable redshift of the candidate host galaxy
  12. GRB 071227: Magellan observations
  13. GRB 071227: REM NIR and Optical observations
  14. Swift-BAT refined analysis of short GRB 071227
  15. GRB 071227: Swift detection of a burst
  16. GRB071020: optical observations
  17. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  18. Swift-BAT trigger 298308 is not a GRB
  19. GRB 071208?: Swift detection of a possible burst
  20. IBAS Alert #4772 in not a GRB
  21. GRB 071125: Suzaku WAM observation of the prompt emission
  22. GRB 070429B: Probable host galaxy and redshift
  23. GRB 071129, Swift-BAT refined analysis
  24. GRB 071129: Swift detection of a burst
  25. Konus-Wind and Konus-A observations of GRB 071125
  26. IPN triangulation of very bright GRB 071125
  27. GRB 071112C: Optical/NIR observations
  28. Disregard the "GRB 071126" position
  29. GRB 071126: Enhanced Swift-XRT position
  30. VLA radio detection of GRB 071122
  31. GRB071122: Swift/UVOT Observations
  32. GRB071104: NIR Afterglow Candidate at TNG
  33. GRB 071122: MASTER optical observation
  34. GRB 071122, Swift-BAT refined analysis
  35. GRB 071122 Swift XRT position update sent in error.
  36. GRB 071122 Swift-XRT refined analysis
  37. GRB 071122: Corrected P60 Coordinates
  38. GRB071122: Gemini Absorption redshift
  39. GRB 071122: P60 Optical Afterglow Candidate
  40. GRB 071122: ROTSE-III Optical Limits
  41. GRB 071122: Swift detection of a burst
  42. GRB 071118: P60 Observations
  43. GRB071118 MITSuME OAO optical observation
  44. GRB 071118: Observations from OSN
  45. GRB 071117: VLT observations and probable redshift
  46. Swift/UVOT observations of GRB071118
  47. GRB 071117: Swift-XRT revised position
  48. Konus-Wind and Konus-A observations of GRB 071117
  49. Swift XRT follow-up observations of GRB071008
  50. Swift/UVOT upper limits for GRB 071117
  51. GRB071118: Swift XRT refined analysis
  52. GRB 071117: Gemini Optical Afterglow Discovery
  53. GRB 071118, Swift-BAT refined analysis
  54. GRB 071117: TAROT La Silla observatory optical observations
  55. GRB 071112B: Gemini Image Differencing
  56. GRB 071118: Swift detection of a burst
  57. GRB 071117: Gemini Observations
  58. GRB 071117: Las Campanas optical observations
  59. GRB 071117: Swift-XRT refined analysis
  60. GRB 071117, Swift-BAT refined analysis
  61. VLT FORS2 observations of short hard GRB071112B
  62. GRB 071117: Swift/XRT position
  63. GRB 071117: Initial Swift/UVOT observations
  64. GRB 071117: Swift detection of a bright burst
  65. VLA radio upper limit on GRB 071112C
  66. ATCA radio observations of short hard burst GRB 071112B
  67. GRB 071112C: Optical and NIR data observed with KANATA
  68. GRB 071112C: WSRT Radio Observations
  69. GRB 071112C: optical observation
  70. GRB 071112C: optical observation
  71. GRB 071112C: emission lines and refined VLT redshift
  72. GRB 071112C MITSuME Akeno early optical observation
  73. GRB 071112C: Gemini Absorption Redshift
  74. GRB 071112B: 2nd epoch of Magellan i-band imaging
  75. GRB 071112C: SARA upper limit
  76. GRB 071112C : Second Epoch Lulin R-band observations
  77. GRB071112C MITSuME Okayama Optical Observation
  78. GRB 071112C: Swift-BAT refined analysis
  79. GRB 071112C: Swift/UVOT observations
  80. GRB 071112C: Swift XRT refined analysis
  81. GRB 071112C: Optical observations at Crni Vrh
  82. Swift UVOT upper limits of GRB071112B
  83. GRB 071112C: VLT redshift
  84. GRB 071112B: Magellan i-band imaging
  85. GRB 071112B: Gemini Optical Imaging (Correction)
  86. GRB 071112B: Gemini Optical Imaging
  87. GRB 071112B: Swift-XRT preliminary analysis
  88. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  89. GRB071112C: NOT observations
  90. GRB 071112C: Palomar Pre-Imaging
  91. Swift-BAT trigger 296491 is not a GRB
  92. GRB 071112C : Lulin R-band observation
  93. GRB 071112C: RTT150 optical observations
  94. GRB 071112C: TAROT Calern observatory optical observations
  95. Swift XRT follow-up observations of GRB071028B
  96. GRB 071112C: Optical and NIR afterglows observed with KANATA
  97. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  98. GRB 071112B: ROTSE-III Rapid Optical Limits
  99. GRB 071112C: Swift detection of a burst with an optical counterpart
  100. GRB 071112B: Swift detection of a short hard burst

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