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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26365 results found.

  1. GRB 071031: REM NIR and Optical observation
  2. GRB 071031: Swift detection of a burst with an optical counterpart
  3. GRB 071028B Swift-BAT detection of a burst
  4. GRB 071028: SARA observations of variable source
  5. Swift UVOT upper limits to GRB071028
  6. GRB071028: Xinglong EST V-band upper limit
  7. GRB 071028: Swift-XRT Team refined analysis
  8. GRB 071028, Swift-BAT refined analysis
  9. GRB 071028: Swift detection of a burst
  10. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  11. GRB071021: MARGE Optical Limits
  12. GRB071020, optical upper limit
  13. GRB 071025: SARA VRI upper limits
  14. Swift UVOT upper limits
  15. GRB071025: Xinglong TNT I-band upper limit
  16. GRB 071025: Swift-XRT Team refined analysis
  17. GRB 060602A: host redshift
  18. GRB 071025, Swift-BAT refined analysis
  19. GRB071021 : CFHT Ks-band observation
  20. GRB 071025: ROTSE-III Refined Analysis
  21. GRB 071025a: PAIRITEL observations
  22. GRB 071025: ROTSE-III Detection of Optical Counterpart
  23. GRB 071025: Swift detection of a burst
  24. GRB 071021: R-band detection and analysis
  25. Possible radio detection of GRB 071021 with the VLA
  26. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  27. GRB 071020: SARA observations
  28. Radio detection of GRB 071020 with the VLA
  29. GRB071021: MITSuME Okayama Optical Upper Limits
  30. GRB 071021: Z-band detection
  31. GRB 071021: optical and NIR observations
  32. GRB 071021: possible high-z burst
  33. GRB 071021, Swift-BAT refined analysis
  34. GRB071018: 2nd epoch obsevations of Xinglong TNT
  35. GRB 071021: Swift-XRT Team refined analysis
  36. GRB 071021: Xinglong TNT optical Upper Limit
  37. GRB 071021 : Lulin R-band limit
  38. GRB 071021: Swift detection of a burst
  39. GRB071020A: Xinglong TNT Optical afterglow observations
  40. GRB 071020: Swift-XRT refined analysis
  41. GRB 071020, Swift-BAT refined analysis
  42. GRB 071020A: IR Imaging with PAIRITEL
  43. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  44. GRB071020 - SDSS Pre-burst Observations
  45. GRB 071020: Swift detection of a bright burst
  46. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  47. GRB 071018: Mercator Telescope optical observations
  48. Swift autonomous slewing re-enabled
  49. GRB 071018: SARA observations
  50. GRB 071018: Swift-XRT observation
  51. GRB 071017 - Swift XRT observations
  52. GRB 071018: Possible OT from Xinglong TNT observation
  53. GRB 071010B: Light Curve Break Confirmed
  54. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  55. GRB 071018, Swift-BAT refined analysis
  56. GRB 071010B: Suzaku WAM observation of the prompt emission
  57. GRB 071013: 3rd TLS Epoch - constraints on variability
  58. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  59. GRB 071010B: Optical observations of EST
  60. GRB 071011: MITSuME Optical Observations
  61. GRB 070920A: deep optical observations at the NOT
  62. GRB 071010B: Keck/LRIS Photometry
  63. GRB 071013: TLS Upper Limit
  64. VLA non-detection of GRB 071011
  65. GRB 071013: Optical observations
  66. GRB 071013: optical observations at NOT
  67. GRB 071013, Swift-BAT refined analysis
  68. GRB071010B, BVRcIc field calibration
  69. GRB 20071013: Xinglong TNT optical Upper Limit
  70. GRB 071010C Swift-BAT detection of a burst
  71. GRB 071011: Optical Limit after 13.95hrs
  72. GRB 071010B correction to GCN 6892 optical observations
  73. GRB 071011: Swift-XRT refined analysis
  74. VLA non-detection of GRB 071010A
  75. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  76. GRB 071011: Confirmation of P60 optical afterglow
  77. GRB 071010B: Optical Detection
  78. GRB 071011: Kanazawa Optical limits
  79. GRB 071011: P60 Optical Afterglow Candidate
  80. GRB 071011: MARGE Optical Limits
  81. GRB 071010B: Super-LOTIS upper limit
  82. GRB 071010B optical photometry
  83. GRB 071011: XRT afterglow detection
  84. GRB 071011, Swift-BAT refined analysis
  85. GRB 071010B: Gemini Spectroscopic Observations
  86. GRB 071011: NAYUTA Optical Observation
  87. GRB 071010A: Continued Keck Imaging
  88. GRB 071010B: Bright OT confirmed with TLS
  89. GRB 071011: Swift detection of a burst
  90. Optical Observation: GRB 071010
  91. Optical observations: GRB 071010A
  92. Konus-Wind observation of GRB 071010B
  93. GRB071010B: Swift/XRT detection
  94. GRB 071010B, Swift-BAT refined analysis
  95. GRB 071010A: bright NIR afterglow
  96. GRB 071006, Swift-BAT refined analysis
  97. GRB 071010A: Keck/LRIS Photometry
  98. GRB 071008, Swift-BAT refined analysis
  99. GRB 071010, Swift-BAT refined analysis
  100. GRB 071010 REM NIR observations

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