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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"

22086 results found.

  1. GRB071028: Xinglong EST V-band upper limit
  2. GRB 071028: Swift-XRT Team refined analysis
  3. GRB 071028: Swift detection of a burst
  4. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  5. GRB071021: MARGE Optical Limits
  6. GRB071020, optical upper limit
  7. GRB 071025: SARA VRI upper limits
  8. GRB 071025 Milagro GeV/TeV Observations
  9. GRB071025: Optical Pre-imaging from Palomar
  10. Swift UVOT upper limits
  11. GRB071025: Xinglong TNT I-band upper limit
  12. GRB 071025: Swift-XRT Team refined analysis
  13. GRB 071025, Swift-BAT refined analysis
  14. GRB071021 : CFHT Ks-band observation
  15. GRB 071025a: PAIRITEL observations
  16. GRB 071025: Swift detection of a burst
  17. GRB 071021: R-band detection and analysis
  18. GRB071021: Optical+NIR observations
  19. Possible radio detection of GRB 071021 with the VLA
  20. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  21. GRB 071020: SARA observations
  22. Radio detection of GRB 071020 with the VLA
  23. GRB071021: MITSuME Okayama Optical Upper Limits
  24. GRB 071021: Magellan i-band observation
  25. GRB 071021: Magellan R-band observation
  26. GRB 071021: Z-band detection
  27. GRB071018: 2nd epoch obsevations of Xinglong TNT
  28. GRB 071021: Xinglong TNT optical Upper Limit
  29. GRB 071021 : Lulin R-band limit
  30. GRB 071021: Swift detection of a burst
  31. GRB071020A: Xinglong TNT Optical afterglow observations
  32. GRB 071020, Swift-BAT refined analysis
  33. GRB 071020A: IR Imaging with PAIRITEL
  34. GRB071020 - SDSS Pre-burst Observations
  35. GRB 071020: Swift detection of a bright burst
  36. GRB 071018: Mercator Telescope optical observations
  37. Swift autonomous slewing re-enabled
  38. GRB 071018: SARA observations
  39. GRB 071018: Swift-XRT observation
  40. GRB 071017 - Swift XRT observations
  41. GRB 071018: Possible OT from Xinglong TNT observation
  42. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  43. GRB 071018, Swift-BAT refined analysis
  44. GRB 071018?: Swift detection of a possible burst
  45. GRB 071013: 3rd TLS Epoch - constraints on variability
  46. GRB 071013: TLS 2nd epoch - Kornienko candidate constant
  47. GRB071013: optical observations
  48. GRB 071011: MITSuME Optical Observations
  49. GRB 070920A: deep optical observations at the NOT
  50. GRB 071010B: Keck/LRIS Photometry
  51. GRB 071013: TLS Upper Limit
  52. VLA non-detection of GRB 071011
  53. GRB 071013: Optical observations
  54. GRB 071013: optical observations at NOT
  55. GRB071010B, BVRcIc field calibration
  56. GRB 20071013: Xinglong TNT optical Upper Limit
  57. GRB 071013: Swift detection of a burst
  58. GRB 071010C Swift-BAT detection of a burst
  59. GRB 071011: Optical Limit after 13.95hrs
  60. GRB 071010B correction to GCN 6892 optical observations
  61. GRB 071011: Swift-XRT refined analysis
  62. VLA non-detection of GRB 071010A
  63. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  64. GRB 071011: Confirmation of P60 optical afterglow
  65. GRB 071010B: Optical Detection
  66. GRB 071011: Kanazawa Optical limits
  67. GRB 071011: P60 Optical Afterglow Candidate
  68. GRB 071011: MARGE Optical Limits
  69. GRB 071010B: Super-LOTIS upper limit
  70. GRB 071010B optical photometry
  71. GRB 071011: XRT afterglow detection
  72. GRB 071011: Early Super-LOTIS Observations
  73. GRB 071011: NAYUTA Optical Observation
  74. GRB 071010A: Continued Keck Imaging
  75. GRB 071010B: Bright OT confirmed with TLS
  76. GRB 071011: Swift detection of a burst
  77. Optical Observation: GRB 071010
  78. Optical observations: GRB 071010A
  79. GRB071010B: Swift/XRT detection
  80. GRB 071006, Swift-BAT refined analysis
  81. GRB071008: optical observations
  82. GRB 071010A: Keck/LRIS Photometry
  83. GRB 071010B: Swift detection of a burst
  84. GRB 071010 REM NIR observations
  85. GRB 071010: TAROT La Silla observatory detection of the afterglow
  86. GRB 071010: Swift detection of a burst
  87. GRB071008: IAC80 observation
  88. GRB 071008: Swift detection of a burst
  89. Radio detection of GRB 071003 with the VLA
  90. GRB 070810B: further XRT analysis
  91. GRB 071003: Possible rebrightening
  92. GRB 071003 : Lulin R-band observations
  93. GRB 071003: OA power-law decay indices from KAIT
  94. GRB 071003: Keck HIRES spectroscopy
  95. GRB 071003: MARGE Observations
  96. GRB 071003: P60 Confirmation of Optical Afterglow
  97. GRB 071003: Swift detection of a bright burst
  98. GRB 071001, Swift-BAT refined analysis
  99. Faulkes Telescope South observations of GRB 071001
  100. GRB 071001: Swift detection of a burst

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