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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"

35995 results found.

  1. GRB 050826: Optical Afterglow and Host Galaxy
  2. GRB 060210: Further refined analysis of the Swift-BAT burst
  3. GRB 060211B: Swift/BAT refined analysis
  4. GRB060210: Swift/UVOT Upper Limits
  5. GRB 060211B: Swift-XRT Team refined analysis
  6. GRB060211b: optical observation
  7. GRB 060210: Optical Observations
  8. GRB060211.7: MASTER_optical_observation under the snow
  9. GRB 060211A: Swift XRT Team Refined Analysis
  10. GRB 060211B: Swift-BAT detection of a burst
  11. GRB060211: Faulkes North observation
  12. GRB 060211: ROTSE-III Optical Limits
  13. GRB 060211: Swift detection of a long burst
  14. GRB 060210: Refined analysis of the Swift-BAT burst
  15. GRB060210: Swift XRT Refined Analysis
  16. GRB060206, optical observations
  17. GRB 060210 : Xinglong and Lulin optical limit
  18. GRB060210: Gemini absorption spectroscopy
  19. GRB 060210: optical evolution
  20. GRB060210:Faulkes Telescope North Afterglow Confirmation
  21. GRB 060210: candidate afterglow
  22. GRB 060210: Swift detection of a burst
  23. GRB 060206: Swift/UVOT Observations
  24. Swift-BAT trigger 180931 is not a GRB
  25. GRB060209: RTT150 optical observations
  26. GRB 060209 : TAROT optical observation
  27. GRB060209A: MASTER optical observation
  28. GRB 060209(?): Swift-BAT detection of a possible burst
  29. GRB 060206: near-infrared observations (JK' imaging)
  30. GRB 060206: WSRT Radio Observations
  31. GRB 060203: Swift/UVOT upper limits
  32. GRB 060206: TTT Observations
  33. GRB 060206: More PROMPT Detections
  34. GRB 060121 : WIDGET Pre-trigger limit
  35. GRB 060206: Tenagra II Observations
  36. GRB 060206: PROMPT Detections
  37. Retraction of orphan GRB afterglow candidate
  38. GRB060204a: Swift XRT Source is not GRB Afterglow
  39. GRB 060206: optical observations at Asiago
  40. Orphan GRB Afterglow candidate
  41. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  42. GRB 060206: Subaru/FOCAS optical spectroscopy
  43. GRB 060206: IR Detection of the Afterglow
  44. GRB 060206: Lick 3m Spectroscopy
  45. GRB 060204A: ROSAT Pointing
  46. GRB 060206: Super-LOTIS observations
  47. GRB060204A: Swift/UVOT observations
  48. GRB 060206: Swift-BAT refined analysis
  49. GRB 060206 : Lulin optical observations
  50. GRB060206: SDSS Pre-Burst Observations
  51. GRB060206: Swift XRT Refined Analysis
  52. GRB060206: Liverpool Telescope observation
  53. GRB 060206: Spectroscopic Redshift
  54. GRB060206: P60 Optical Observations
  55. GRB 060206: KAIT observations
  56. GRB060206: Swift XRT Position
  57. GRB060206: SARA Detection
  58. GRB 060206: RAPTOR observations of afterglow candidate variability.
  59. GRB 060206: High redshift burst
  60. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  61. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  62. BAT GRB 060204C is probably not a GRB
  63. GRB060204C: optical observation
  64. GRB 060204B: BVRi-band detections of optical afterglow
  65. GRB 060204A: Swift XRT upper limit
  66. GRB 060204A: FRAM optical observations
  67. GRB060204B: Swift/UVOT refined analysis
  68. GRB 060204C: optical observations
  69. Swift XRT Observation of GRB 060204C
  70. GRB 060204B: Swift-BAT refined analysis
  71. GRB 060204B: ART early limit
  72. GRB060204B: Swift XRT Team Refined Analysis
  73. GRB 060204C: OSN limits
  74. GRB 060204b: Keck/LRIS Afterglow Confirmation
  75. GRB 060204C: BOOTES-IR optical limits
  76. GRB 060204C: Liverpool Telescopes optical limit
  77. GRB 060204C: ROTSE-III Optical Limits
  78. GRB 060204C: Swift-BAT detection of a burst
  79. GRB 060124: Radio Observations
  80. GRB060204B: Faulkes OT candidate
  81. GRB 060204B: ART optical limit
  82. GRB 060204A: further INTEGRAL results
  83. GRB060204B - SDSS pre-burst observations
  84. GRB 060203: Swift-BAT refined analysis
  85. GRB 060204B: Swift detection of a burst
  86. GRB 060204: a long GRB detected by INTEGRAL
  87. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  88. GRB 060203: RTT150 optical observations
  89. GRB060203: Swift XRT Team Refined Analysis
  90. Swift-BAT trigger is GRB 060203
  91. GRB 060203: IR Counterpart
  92. GRB060203: Observations with SARA
  93. GRB 060203: P60 Confirmation of Optical Afterglow
  94. Possible GRB 060203: candidate optical counterpart
  95. Possible GRB 060203: optical observations at Asiago
  96. GRB 060202: PROMPT Observations
  97. GRB 060202: GETS observation
  98. GRB 060202: Gemini-N J, H, K_s observations
  99. GRB 060202 : Kiso B and R band limit
  100. GRB 060202: Near-IR Observation with UKIRT/WFCAM

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