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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"

36208 results found.

  1. GRB060121: optical observations
  2. GRB060110: optical observations
  3. GRB060105: optical observations
  4. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  5. GRB 060211b: P60 Observations
  6. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  7. GRB 060206: SOAR Detections
  8. GRB 050826: Optical Afterglow and Host Galaxy
  9. GRB 060210: Further refined analysis of the Swift-BAT burst
  10. GRB 060211B: Swift/BAT refined analysis
  11. GRB060210: Swift/UVOT Upper Limits
  12. GRB 060211B: Swift-XRT Team refined analysis
  13. GRB060211b: optical observation
  14. GRB 060210: Optical Observations
  15. GRB060211.7: MASTER_optical_observation under the snow
  16. GRB 060211A: Swift XRT Team Refined Analysis
  17. GRB 060211B: Swift-BAT detection of a burst
  18. GRB060211: Faulkes North observation
  19. GRB 060211: ROTSE-III Optical Limits
  20. GRB 060211: Swift detection of a long burst
  21. GRB 060210: Refined analysis of the Swift-BAT burst
  22. GRB060210: Swift XRT Refined Analysis
  23. GRB060206, optical observations
  24. GRB 060210 : Xinglong and Lulin optical limit
  25. GRB060210: Gemini absorption spectroscopy
  26. GRB 060210: optical evolution
  27. GRB060210:Faulkes Telescope North Afterglow Confirmation
  28. GRB 060210: candidate afterglow
  29. GRB 060210: Swift detection of a burst
  30. GRB 060206: Swift/UVOT Observations
  31. Swift-BAT trigger 180931 is not a GRB
  32. GRB060209: RTT150 optical observations
  33. GRB 060209 : TAROT optical observation
  34. GRB060209A: MASTER optical observation
  35. GRB 060209(?): Swift-BAT detection of a possible burst
  36. GRB 060206: near-infrared observations (JK' imaging)
  37. GRB 060206: WSRT Radio Observations
  38. GRB 060203: Swift/UVOT upper limits
  39. GRB 060206: TTT Observations
  40. GRB 060206: More PROMPT Detections
  41. GRB 060121 : WIDGET Pre-trigger limit
  42. GRB 060206: Tenagra II Observations
  43. GRB 060206: PROMPT Detections
  44. Retraction of orphan GRB afterglow candidate
  45. GRB060204a: Swift XRT Source is not GRB Afterglow
  46. GRB 060206: optical observations at Asiago
  47. Orphan GRB Afterglow candidate
  48. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  49. GRB 060206: Subaru/FOCAS optical spectroscopy
  50. GRB 060206: IR Detection of the Afterglow
  51. GRB 060206: Lick 3m Spectroscopy
  52. GRB 060204A: ROSAT Pointing
  53. GRB 060206: Super-LOTIS observations
  54. GRB060204A: Swift/UVOT observations
  55. GRB 060206: Swift-BAT refined analysis
  56. GRB 060206 : Lulin optical observations
  57. GRB060206: SDSS Pre-Burst Observations
  58. GRB060206: Swift XRT Refined Analysis
  59. GRB060206: Liverpool Telescope observation
  60. GRB 060206: Spectroscopic Redshift
  61. GRB060206: P60 Optical Observations
  62. GRB 060206: KAIT observations
  63. GRB060206: Swift XRT Position
  64. GRB060206: SARA Detection
  65. GRB 060206: RAPTOR observations of afterglow candidate variability.
  66. GRB 060206: High redshift burst
  67. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  68. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  69. BAT GRB 060204C is probably not a GRB
  70. GRB060204C: optical observation
  71. GRB 060204B: BVRi-band detections of optical afterglow
  72. GRB 060204A: Swift XRT upper limit
  73. GRB 060204A: FRAM optical observations
  74. GRB060204B: Swift/UVOT refined analysis
  75. GRB 060204C: optical observations
  76. Swift XRT Observation of GRB 060204C
  77. GRB 060204B: Swift-BAT refined analysis
  78. GRB 060204B: ART early limit
  79. GRB060204B: Swift XRT Team Refined Analysis
  80. GRB 060204C: OSN limits
  81. GRB 060204b: Keck/LRIS Afterglow Confirmation
  82. GRB 060204C: BOOTES-IR optical limits
  83. GRB 060204C: Liverpool Telescopes optical limit
  84. GRB 060204C: ROTSE-III Optical Limits
  85. GRB 060204C: Swift-BAT detection of a burst
  86. GRB 060124: Radio Observations
  87. GRB060204B: Faulkes OT candidate
  88. GRB 060204B: ART optical limit
  89. GRB 060204A: further INTEGRAL results
  90. GRB060204B - SDSS pre-burst observations
  91. GRB 060203: Swift-BAT refined analysis
  92. GRB 060204B: Swift detection of a burst
  93. GRB 060204: a long GRB detected by INTEGRAL
  94. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  95. GRB 060203: RTT150 optical observations
  96. GRB060203: Swift XRT Team Refined Analysis
  97. Swift-BAT trigger is GRB 060203
  98. GRB 060203: IR Counterpart
  99. GRB060203: Observations with SARA
  100. GRB 060203: P60 Confirmation of Optical Afterglow

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