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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"

36804 results found.

  1. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  2. GRB 060211A: Further refined analysis of the Swift burst
  3. GRB060121: optical observations
  4. GRB060110: optical observations
  5. GRB060105: optical observations
  6. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  7. GRB 060211b: P60 Observations
  8. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  9. GRB 060206: SOAR Detections
  10. GRB 050826: Optical Afterglow and Host Galaxy
  11. GRB 060210: Further refined analysis of the Swift-BAT burst
  12. GRB 060211B: Swift/BAT refined analysis
  13. GRB060210: Swift/UVOT Upper Limits
  14. GRB 060211B: Swift-XRT Team refined analysis
  15. GRB060211b: optical observation
  16. GRB 060210: Optical Observations
  17. GRB060211.7: MASTER_optical_observation under the snow
  18. GRB 060211A: Swift XRT Team Refined Analysis
  19. GRB 060211B: Swift-BAT detection of a burst
  20. GRB060211: Faulkes North observation
  21. GRB 060211: ROTSE-III Optical Limits
  22. GRB 060211: Swift detection of a long burst
  23. GRB 060210: Refined analysis of the Swift-BAT burst
  24. GRB060210: Swift XRT Refined Analysis
  25. GRB060206, optical observations
  26. GRB 060210 : Xinglong and Lulin optical limit
  27. GRB060210: Gemini absorption spectroscopy
  28. GRB 060210: optical evolution
  29. GRB060210:Faulkes Telescope North Afterglow Confirmation
  30. GRB 060210: candidate afterglow
  31. GRB 060210: Swift detection of a burst
  32. GRB 060206: Swift/UVOT Observations
  33. Swift-BAT trigger 180931 is not a GRB
  34. GRB060209: RTT150 optical observations
  35. GRB 060209 : TAROT optical observation
  36. GRB060209A: MASTER optical observation
  37. GRB 060209(?): Swift-BAT detection of a possible burst
  38. GRB 060206: near-infrared observations (JK' imaging)
  39. GRB 060206: WSRT Radio Observations
  40. GRB 060203: Swift/UVOT upper limits
  41. GRB 060206: TTT Observations
  42. GRB 060206: More PROMPT Detections
  43. GRB 060121 : WIDGET Pre-trigger limit
  44. GRB 060206: Tenagra II Observations
  45. GRB 060206: PROMPT Detections
  46. Retraction of orphan GRB afterglow candidate
  47. GRB060204a: Swift XRT Source is not GRB Afterglow
  48. GRB 060206: optical observations at Asiago
  49. Orphan GRB Afterglow candidate
  50. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  51. GRB 060206: Subaru/FOCAS optical spectroscopy
  52. GRB 060206: IR Detection of the Afterglow
  53. GRB 060206: Lick 3m Spectroscopy
  54. GRB 060204A: ROSAT Pointing
  55. GRB 060206: Super-LOTIS observations
  56. GRB060204A: Swift/UVOT observations
  57. GRB 060206: Swift-BAT refined analysis
  58. GRB 060206 : Lulin optical observations
  59. GRB060206: SDSS Pre-Burst Observations
  60. GRB060206: Swift XRT Refined Analysis
  61. GRB060206: Liverpool Telescope observation
  62. GRB 060206: Spectroscopic Redshift
  63. GRB060206: P60 Optical Observations
  64. GRB 060206: KAIT observations
  65. GRB060206: Swift XRT Position
  66. GRB060206: SARA Detection
  67. GRB 060206: RAPTOR observations of afterglow candidate variability.
  68. GRB 060206: High redshift burst
  69. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  70. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  71. BAT GRB 060204C is probably not a GRB
  72. GRB060204C: optical observation
  73. GRB 060204B: BVRi-band detections of optical afterglow
  74. GRB 060204A: Swift XRT upper limit
  75. GRB 060204A: FRAM optical observations
  76. GRB060204B: Swift/UVOT refined analysis
  77. GRB 060204C: optical observations
  78. Swift XRT Observation of GRB 060204C
  79. GRB 060204B: Swift-BAT refined analysis
  80. GRB 060204B: ART early limit
  81. GRB060204B: Swift XRT Team Refined Analysis
  82. GRB 060204C: OSN limits
  83. GRB 060204b: Keck/LRIS Afterglow Confirmation
  84. GRB 060204C: BOOTES-IR optical limits
  85. GRB 060204C: Liverpool Telescopes optical limit
  86. GRB 060204C: ROTSE-III Optical Limits
  87. GRB 060204C: Swift-BAT detection of a burst
  88. GRB 060124: Radio Observations
  89. GRB060204B: Faulkes OT candidate
  90. GRB 060204B: ART optical limit
  91. GRB 060204A: further INTEGRAL results
  92. GRB060204B - SDSS pre-burst observations
  93. GRB 060203: Swift-BAT refined analysis
  94. GRB 060204B: Swift detection of a burst
  95. GRB 060204: a long GRB detected by INTEGRAL
  96. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  97. GRB 060203: RTT150 optical observations
  98. GRB060203: Swift XRT Team Refined Analysis
  99. Swift-BAT trigger is GRB 060203
  100. GRB 060203: IR Counterpart

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