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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"

28098 results found.

  1. GRB 071112C: Swift XRT refined analysis
  2. Swift UVOT upper limits of GRB071112B
  3. GRB 071112B: Gemini Optical Imaging
  4. GRB 071112B: Swift-XRT preliminary analysis
  5. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  6. GRB 071112C : Lulin R-band observation
  7. GRB 071112C: TAROT Calern observatory optical observations
  8. Swift XRT follow-up observations of GRB071028B
  9. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  10. GRB 071112C: Optical and NIR afterglows observed with KANATA
  11. GRB 071112C: Swift detection of a burst with an optical counterpart
  12. GRB 071112B: Swift detection of a short hard burst
  13. GRB 071112: Swift detection of a possible burst
  14. Swift/UVOT initial analysis of GRB071109
  15. GRB 071109: further Swift-XRT analysis
  16. GRB 071109: TAROT Calern observatory optical observations
  17. GRB 071109: Swift-XRT possible X-ray counterpart
  18. GRB 071109: IBIS refined analysis
  19. GRB 071104: Swift-XRT Team Refined Analysis
  20. GRB 071104: Possible Swift UVOT Afterglow Candidate
  21. GRB 071104: Swift-XRT position
  22. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  23. Swift XRT and UVOT observations of GRB071028B
  24. GRB 071101, Swift-BAT refined analysis
  25. GRB 071101: Swift-XRT Team refined analysis
  26. GRB071101: Optical and NIR upper limits by KANATA
  27. GRB0711101: Two new source from Xinglong TNT observation
  28. GRB 071101: TAROT Calern observatory optical observations
  29. GRB071101 LOAO B,V,R,I observation
  30. GRB 071101: Swift detection of a burst
  31. GRB 071031, Swift-BAT refined analysis
  32. GRB 071031: Swift-XRT Team refined analysis
  33. GRB 071020: MITSuME Akeno optical observations
  34. GRB 071031: REM NIR and Optical observation
  35. GRB 071031: Swift detection of a burst with an optical counterpart
  36. GRB 071028B Swift-BAT detection of a burst
  37. GRB 071028: SARA observations of variable source
  38. Swift UVOT upper limits to GRB071028
  39. GRB071028: Xinglong EST V-band upper limit
  40. GRB 071028: Swift-XRT Team refined analysis
  41. GRB 071028, Swift-BAT refined analysis
  42. GRB 071028: Swift detection of a burst
  43. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  44. GRB071021: MARGE Optical Limits
  45. GRB071020, optical upper limit
  46. GRB 071025: SARA VRI upper limits
  47. Swift UVOT upper limits
  48. GRB071025: Xinglong TNT I-band upper limit
  49. GRB 071025: Swift-XRT Team refined analysis
  50. GRB 060602A: host redshift
  51. GRB 071025, Swift-BAT refined analysis
  52. GRB071021 : CFHT Ks-band observation
  53. GRB 071025: ROTSE-III Refined Analysis
  54. GRB 071025a: PAIRITEL observations
  55. GRB 071025: ROTSE-III Detection of Optical Counterpart
  56. GRB 071025: Swift detection of a burst
  57. GRB 071021: R-band detection and analysis
  58. Possible radio detection of GRB 071021 with the VLA
  59. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  60. GRB 071020: SARA observations
  61. Radio detection of GRB 071020 with the VLA
  62. GRB071021: MITSuME Okayama Optical Upper Limits
  63. GRB 071021: Z-band detection
  64. GRB 071021: optical and NIR observations
  65. GRB 071021: possible high-z burst
  66. GRB 071021, Swift-BAT refined analysis
  67. GRB071018: 2nd epoch obsevations of Xinglong TNT
  68. GRB 071021: Swift-XRT Team refined analysis
  69. GRB 071021: Xinglong TNT optical Upper Limit
  70. GRB 071021 : Lulin R-band limit
  71. GRB 071021: Swift detection of a burst
  72. GRB071020A: Xinglong TNT Optical afterglow observations
  73. GRB 071020: Swift-XRT refined analysis
  74. GRB 071020, Swift-BAT refined analysis
  75. GRB 071020A: IR Imaging with PAIRITEL
  76. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  77. GRB071020 - SDSS Pre-burst Observations
  78. GRB 071020: Swift detection of a bright burst
  79. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  80. GRB 071018: Mercator Telescope optical observations
  81. Swift autonomous slewing re-enabled
  82. GRB 071018: SARA observations
  83. GRB 071018: Swift-XRT observation
  84. GRB 071017 - Swift XRT observations
  85. GRB 071018: Possible OT from Xinglong TNT observation
  86. GRB 071010B: Light Curve Break Confirmed
  87. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  88. GRB 071018, Swift-BAT refined analysis
  89. GRB 071010B: Suzaku WAM observation of the prompt emission
  90. GRB 071013: 3rd TLS Epoch - constraints on variability
  91. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  92. GRB 071010B: Optical observations of EST
  93. GRB 071011: MITSuME Optical Observations
  94. GRB 070920A: deep optical observations at the NOT
  95. GRB 071010B: Keck/LRIS Photometry
  96. GRB 071013: TLS Upper Limit
  97. VLA non-detection of GRB 071011
  98. GRB 071013: Optical observations
  99. GRB 071013: optical observations at NOT
  100. GRB 071013, Swift-BAT refined analysis

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