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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"

37566 results found.

  1. GRB 071118: P60 Observations
  2. GRB071118 MITSuME OAO optical observation
  3. GRB 071118: Observations from OSN
  4. GRB 071117: VLT observations and probable redshift
  5. Swift/UVOT observations of GRB071118
  6. GRB 071117: Swift-XRT revised position
  7. Konus-Wind and Konus-A observations of GRB 071117
  8. Swift XRT follow-up observations of GRB071008
  9. Swift/UVOT upper limits for GRB 071117
  10. GRB071118: Swift XRT refined analysis
  11. GRB 071117: Gemini Optical Afterglow Discovery
  12. GRB 071118, Swift-BAT refined analysis
  13. GRB 071117: TAROT La Silla observatory optical observations
  14. GRB 071112B: Gemini Image Differencing
  15. GRB 071118: Swift detection of a burst
  16. GRB 071117: Gemini Observations
  17. GRB 071117: Las Campanas optical observations
  18. GRB 071117: Swift-XRT refined analysis
  19. GRB 071117, Swift-BAT refined analysis
  20. VLT FORS2 observations of short hard GRB071112B
  21. GRB 071117: Swift/XRT position
  22. GRB 071117: Initial Swift/UVOT observations
  23. GRB 071117: Swift detection of a bright burst
  24. VLA radio upper limit on GRB 071112C
  25. ATCA radio observations of short hard burst GRB 071112B
  26. GRB 071112C: Optical and NIR data observed with KANATA
  27. GRB 071112C: WSRT Radio Observations
  28. GRB 071112C: optical observation
  29. GRB 071112C: optical observation
  30. GRB 071112C: emission lines and refined VLT redshift
  31. GRB 071112C MITSuME Akeno early optical observation
  32. GRB 071112C: Gemini Absorption Redshift
  33. GRB 071112B: 2nd epoch of Magellan i-band imaging
  34. GRB 071112C: SARA upper limit
  35. GRB 071112C : Second Epoch Lulin R-band observations
  36. GRB071112C MITSuME Okayama Optical Observation
  37. GRB 071112C: Swift-BAT refined analysis
  38. GRB 071112C: Swift/UVOT observations
  39. GRB 071112C: Swift XRT refined analysis
  40. GRB 071112C: Optical observations at Crni Vrh
  41. Swift UVOT upper limits of GRB071112B
  42. GRB 071112C: VLT redshift
  43. GRB 071112B: Magellan i-band imaging
  44. GRB 071112B: Gemini Optical Imaging (Correction)
  45. GRB 071112B: Gemini Optical Imaging
  46. GRB 071112B: Swift-XRT preliminary analysis
  47. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  48. GRB071112C: NOT observations
  49. GRB 071112C: Palomar Pre-Imaging
  50. Swift-BAT trigger 296491 is not a GRB
  51. GRB 071112C : Lulin R-band observation
  52. GRB 071112C: RTT150 optical observations
  53. GRB 071112C: TAROT Calern observatory optical observations
  54. Swift XRT follow-up observations of GRB071028B
  55. GRB 071112C: Optical and NIR afterglows observed with KANATA
  56. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  57. GRB 071112B: ROTSE-III Rapid Optical Limits
  58. GRB 071112C: Swift detection of a burst with an optical counterpart
  59. GRB 071112B: Swift detection of a short hard burst
  60. GRB 071112: Swift detection of a possible burst
  61. VLA IInd observation of INTEGRAL burst GRB 071109
  62. Swift/UVOT initial analysis of GRB071109
  63. GRB 071109: further Swift-XRT analysis
  64. GRB 071109: TAROT Calern observatory optical observations
  65. No radio detection at Swift-XRT position
  66. GRB 071109: Swift-XRT possible X-ray counterpart
  67. VLA prompt radio detection of the INTEGRAL burst 071109
  68. GRB 071109: IBIS refined analysis
  69. GRB 071109: BOOTES-2 prompt optical observations
  70. GRB 071109: A long GRB detected by INTEGRAL
  71. GRB 071104: Swift-XRT Team Refined Analysis
  72. GRB 071104: Possible Swift UVOT Afterglow Candidate
  73. GRB 071104: Swift-XRT position
  74. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  75. GRB071010b: optical observation
  76. Swift XRT and UVOT observations of GRB071028B
  77. GRB 071101, Swift-BAT refined analysis
  78. GRB 071101: Swift-XRT Team refined analysis
  79. GRB071101: Optical and NIR upper limits by KANATA
  80. GRB 071101: TAROT Calern observatory optical observations
  81. GRB 071101: Swift XRT position
  82. GRB071101 LOAO B,V,R,I observation
  83. GRB 071101: BOOTES-2 prompt optical observations
  84. GRB 071101: a nearby galaxy
  85. GRB 071101: Swift detection of a burst
  86. GRB 071031, Swift-BAT refined analysis
  87. GRB 071031: Swift/UVOT detection of afterglow
  88. GRB 071031: Swift-XRT Team refined analysis
  89. GRB 071020: MITSuME Akeno optical observations
  90. GRB 071031: REM NIR and Optical observation
  91. GRB 071031, SMARTS afterglow observations
  92. GRB 071031: VLT high-resolution spectroscopy
  93. GRB071031: Rapid PROMPT Detections
  94. GRB 071031: GROND detection in all bands
  95. GRB 071031: Swift detection of a burst with an optical counterpart
  96. GRB 071028B Swift-BAT detection of a burst
  97. GRB 071028: SARA observations of variable source
  98. Swift UVOT upper limits to GRB071028
  99. GRB 071028: Swift-XRT Team refined analysis
  100. GRB 071028, Swift-BAT refined analysis

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