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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"

38683 results found.

  1. GRB 071112C: Optical observations at Crni Vrh
  2. Swift UVOT upper limits of GRB071112B
  3. GRB 071112C: VLT redshift
  4. GRB 071112B: Magellan i-band imaging
  5. GRB 071112B: Gemini Optical Imaging (Correction)
  6. GRB 071112B: Gemini Optical Imaging
  7. GRB 071112B: Swift-XRT preliminary analysis
  8. GRB071112C: NOT observations
  9. Swift-BAT trigger 296491 is not a GRB
  10. GRB 071112C : Lulin R-band observation
  11. Swift XRT follow-up observations of GRB071028B
  12. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  13. GRB 071112C: Optical and NIR afterglows observed with KANATA
  14. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  15. GRB 071112B: ROTSE-III Rapid Optical Limits
  16. GRB 071112C: Swift detection of a burst with an optical counterpart
  17. GRB 071112B: Swift detection of a short hard burst
  18. GRB 071112: Swift detection of a possible burst
  19. GRB071109: Super-LOTIS observations
  20. VLA IInd observation of INTEGRAL burst GRB 071109
  21. Swift/UVOT initial analysis of GRB071109
  22. GRB 071109: further Swift-XRT analysis
  23. No radio detection at Swift-XRT position
  24. GRB 071109: Swift-XRT possible X-ray counterpart
  25. VLA prompt radio detection of the INTEGRAL burst 071109
  26. GRB 071109: IBIS refined analysis
  27. GRB 071109: BOOTES-2 prompt optical observations
  28. GRB 071109: A long GRB detected by INTEGRAL
  29. GRB 071104: Swift-XRT Team Refined Analysis
  30. GRB 071104: Possible Swift UVOT Afterglow Candidate
  31. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  32. GRB071010b: optical observation
  33. Swift XRT and UVOT observations of GRB071028B
  34. GRB 071101: Swift-XRT Team refined analysis
  35. GRB071101: Optical and NIR upper limits by KANATA
  36. GRB0711101: Two new source from Xinglong TNT observation
  37. GRB 071101: Swift XRT position
  38. GRB071101 LOAO B,V,R,I observation
  39. GRB 071101: BOOTES-2 prompt optical observations
  40. GRB 071101: Swift detection of a burst
  41. GRB 071031: Swift/UVOT detection of afterglow
  42. GRB 071031: Swift-XRT Team refined analysis
  43. GRB 071020: MITSuME Akeno optical observations
  44. GRB 071031: REM NIR and Optical observation
  45. GRB 071031, SMARTS afterglow observations
  46. GRB 071031: VLT high-resolution spectroscopy
  47. GRB 071031: Swift detection of a burst with an optical counterpart
  48. GRB 071028B Swift-BAT detection of a burst
  49. GRB 071028: SARA observations of variable source
  50. Swift UVOT upper limits to GRB071028
  51. GRB071028: Xinglong EST V-band upper limit
  52. GRB 071028: Swift-XRT Team refined analysis
  53. GRB 071028: Swift detection of a burst
  54. GRB 071025: Kuiper Telescope Optical Observations
  55. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  56. GRB 071018: Revised BAT position
  57. GRB071021: MARGE Optical Limits
  58. GRB071020, optical upper limit
  59. GRB 071025: SARA VRI upper limits
  60. GRB 071025 Milagro GeV/TeV Observations
  61. GRB 071025: SQIID JHK photometry
  62. Swift UVOT upper limits
  63. GRB071025: Xinglong TNT I-band upper limit
  64. GRB 071025: Swift-XRT Team refined analysis
  65. GRB 060602A: host redshift
  66. GRB 071025, Swift-BAT refined analysis
  67. GRB 071025: Early Super-LOTIS Observations
  68. GRB 071025: R/I-band update
  69. GRB071021 : CFHT Ks-band observation
  70. GRB 071025: ROTSE-III Refined Analysis
  71. GRB 071025: I-detection, R-dropout?
  72. GRB 071025: Swift XRT refined position
  73. GRB 071025a: PAIRITEL observations
  74. GRB071025: REM NIR afterglow
  75. GRB 071025: ROTSE-III Detection of Optical Counterpart
  76. GRB 071025: Swift detection of a burst
  77. GRB 071021: R-band detection and analysis
  78. GRB 071020: BTA spectroscopy
  79. Possible radio detection of GRB 071021 with the VLA
  80. GRB 071020: SARA observations
  81. Radio detection of GRB 071020 with the VLA
  82. GRB071010b: optical observation
  83. GRB 071021: Subaru NIR observation
  84. GRB071021: MITSuME Okayama Optical Upper Limits
  85. GRB 071021: Magellan i-band observation
  86. GRB 071021: Magellan R-band observation
  87. GRB 071021: Z-band detection
  88. GRB 071021: correction to GCNC 6968
  89. GRB 071020: Fading slowly?
  90. GRB 071010B: Fading quickly
  91. GRB 071021: optical and NIR observations
  92. GRB071018: 2nd epoch obsevations of Xinglong TNT
  93. GRB 071021: Swift-XRT Team refined analysis
  94. GRB 071021: Xinglong TNT optical Upper Limit
  95. GRB 071021 : Lulin R-band limit
  96. Konus-Wind observation of GRB 071020
  97. GRB 071021: Faulkes Telescope South optical candidate
  98. GRB 071021: Swift detection of a burst
  99. GRB 071010B: Independent Confirmation of Break
  100. GRB071020A: Xinglong TNT Optical afterglow observations

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