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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"

32559 results found.

  1. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  2. GRB071112C: NOT observations
  3. GRB 071112C: Palomar Pre-Imaging
  4. Swift-BAT trigger 296491 is not a GRB
  5. GRB 071112C : Lulin R-band observation
  6. GRB 071112C: RTT150 optical observations
  7. Swift XRT follow-up observations of GRB071028B
  8. GRB071112C Xinglong_TNT_and_EST_afterglow observations
  9. GRB 071112C: Optical and NIR afterglows observed with KANATA
  10. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 071112B: ROTSE-III Rapid Optical Limits
  12. GRB071109: Super-LOTIS observations
  13. VLA IInd observation of INTEGRAL burst GRB 071109
  14. Swift/UVOT initial analysis of GRB071109
  15. GRB 071109: further Swift-XRT analysis
  16. No radio detection at Swift-XRT position
  17. GRB 071109: Swift-XRT possible X-ray counterpart
  18. VLA prompt radio detection of the INTEGRAL burst 071109
  19. GRB 071109: IBIS refined analysis
  20. GRB 071109: BOOTES-2 prompt optical observations
  21. GRB 071104: Swift-XRT Team Refined Analysis
  22. GRB 071104: Possible Swift UVOT Afterglow Candidate
  23. GRB 071104: Swift-XRT position
  24. GRB071010b: optical observation
  25. Swift XRT and UVOT observations of GRB071028B
  26. GRB 071101, Swift-BAT refined analysis
  27. GRB 071101: Swift-XRT Team refined analysis
  28. GRB071101: Optical and NIR upper limits by KANATA
  29. GRB0711101: Two new source from Xinglong TNT observation
  30. GRB 071101: TAROT Calern observatory optical observations
  31. GRB 071101: Swift XRT position
  32. GRB 071101: BOOTES-2 prompt optical observations
  33. GRB 071101: a nearby galaxy
  34. GRB 071031, Swift-BAT refined analysis
  35. GRB 071031: Swift/UVOT detection of afterglow
  36. GRB 071031: Swift-XRT Team refined analysis
  37. GRB 071020: MITSuME Akeno optical observations
  38. GRB 071031: REM NIR and Optical observation
  39. GRB 071031, SMARTS afterglow observations
  40. GRB 071031: VLT high-resolution spectroscopy
  41. GRB071031: Rapid PROMPT Detections
  42. GRB 071028B Swift-BAT detection of a burst
  43. GRB071025: Optical+NIR observations
  44. GRB 071028: SARA observations of variable source
  45. Swift UVOT upper limits to GRB071028
  46. GRB 071028: Swift-XRT Team refined analysis
  47. GRB 071028, Swift-BAT refined analysis
  48. GRB 071025: Kuiper Telescope Optical Observations
  49. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  50. GRB 071018: Revised BAT position
  51. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  52. GRB071021: MARGE Optical Limits
  53. GRB071020, optical upper limit
  54. GRB 071025: SARA VRI upper limits
  55. GRB 071025 Milagro GeV/TeV Observations
  56. GRB071025: Optical Pre-imaging from Palomar
  57. Swift UVOT upper limits
  58. GRB071025: Xinglong TNT I-band upper limit
  59. GRB 071025: Swift-XRT Team refined analysis
  60. GRB 071025, Swift-BAT refined analysis
  61. GRB 071025: Early Super-LOTIS Observations
  62. GRB 071025: R/I-band update
  63. GRB071021 : CFHT Ks-band observation
  64. GRB 071025: ROTSE-III Refined Analysis
  65. GRB 071025: Swift XRT refined position
  66. GRB 071025a: PAIRITEL observations
  67. GRB071025: REM NIR afterglow
  68. GRB 071025: ROTSE-III Detection of Optical Counterpart
  69. GRB 071021: R-band detection and analysis
  70. GRB 071020: BTA spectroscopy
  71. GRB071021: Optical+NIR observations
  72. Possible radio detection of GRB 071021 with the VLA
  73. Optical observations of GRB 071020
  74. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  75. GRB 071020: SARA observations
  76. Radio detection of GRB 071020 with the VLA
  77. GRB071010b: optical observation
  78. GRB 071021: Subaru NIR observation
  79. GRB 071021: Magellan i-band observation
  80. GRB 071021: Z-band detection
  81. GRB 071020: Fading slowly?
  82. GRB 071010B: Fading quickly
  83. GRB 071021: optical and NIR observations
  84. GRB 071021: possible high-z burst
  85. GRB 071021, Swift-BAT refined analysis
  86. GRB071018: 2nd epoch obsevations of Xinglong TNT
  87. GRB 071021: retraction of Faulkes Telescope South candidate
  88. GRB 071021: Swift-XRT Team refined analysis
  89. GRB 071021: Xinglong TNT optical Upper Limit
  90. GRB 071021 : Lulin R-band limit
  91. Konus-Wind observation of GRB 071020
  92. GRB 071021: Faulkes Telescope South optical candidate
  93. GRB 071010B: Independent Confirmation of Break
  94. GRB071020A: Xinglong TNT Optical afterglow observations
  95. GRB 071020: Swift-XRT refined analysis
  96. GRB 071020, Swift-BAT refined analysis
  97. GRB 071020A: IR Imaging with PAIRITEL
  98. GRB 071020: VLT spectroscopy
  99. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  100. GRB 071020A: ROTSE-III Detection of Optical Counterpart

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