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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"

37222 results found.

  1. GRB 060210: optical evolution
  2. GRB060210:Faulkes Telescope North Afterglow Confirmation
  3. GRB 060210: candidate afterglow
  4. GRB 060210: Swift detection of a burst
  5. GRB 060206: Swift/UVOT Observations
  6. Swift-BAT trigger 180931 is not a GRB
  7. GRB060209: RTT150 optical observations
  8. GRB 060209 : TAROT optical observation
  9. GRB060209A: MASTER optical observation
  10. GRB 060209(?): Swift-BAT detection of a possible burst
  11. GRB 060206: near-infrared observations (JK' imaging)
  12. GRB 060206: WSRT Radio Observations
  13. GRB 060203: Swift/UVOT upper limits
  14. GRB 060206: TTT Observations
  15. GRB 060206: More PROMPT Detections
  16. GRB 060121 : WIDGET Pre-trigger limit
  17. GRB 060206: Tenagra II Observations
  18. GRB 060206: PROMPT Detections
  19. Retraction of orphan GRB afterglow candidate
  20. GRB060204a: Swift XRT Source is not GRB Afterglow
  21. GRB 060206: optical observations at Asiago
  22. Orphan GRB Afterglow candidate
  23. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  24. GRB 060206: Subaru/FOCAS optical spectroscopy
  25. GRB 060206: IR Detection of the Afterglow
  26. GRB 060206: Lick 3m Spectroscopy
  27. GRB 060204A: ROSAT Pointing
  28. GRB 060206: Super-LOTIS observations
  29. GRB060204A: Swift/UVOT observations
  30. GRB 060206: Swift-BAT refined analysis
  31. GRB 060206 : Lulin optical observations
  32. GRB060206: SDSS Pre-Burst Observations
  33. GRB060206: Swift XRT Refined Analysis
  34. GRB060206: Liverpool Telescope observation
  35. GRB 060206: Spectroscopic Redshift
  36. GRB060206: P60 Optical Observations
  37. GRB 060206: KAIT observations
  38. GRB060206: Swift XRT Position
  39. GRB060206: SARA Detection
  40. GRB 060206: RAPTOR observations of afterglow candidate variability.
  41. GRB 060206: High redshift burst
  42. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  43. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  44. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  45. BAT GRB 060204C is probably not a GRB
  46. GRB060204C: optical observation
  47. GRB 060204B: BVRi-band detections of optical afterglow
  48. GRB 060204A: Swift XRT upper limit
  49. GRB 060204A: FRAM optical observations
  50. GRB060204B: Swift/UVOT refined analysis
  51. GRB 060204C: optical observations
  52. Swift XRT Observation of GRB 060204C
  53. GRB 060204B: Swift-BAT refined analysis
  54. GRB 060204B: ART early limit
  55. GRB060204B: Swift XRT Team Refined Analysis
  56. GRB 060204C: OSN limits
  57. GRB 060204b: Keck/LRIS Afterglow Confirmation
  58. GRB 060204C: BOOTES-IR optical limits
  59. GRB 060204C: Liverpool Telescopes optical limit
  60. GRB 060204C: ROTSE-III Optical Limits
  61. GRB 060204C: Swift-BAT detection of a burst
  62. GRB 060124: Radio Observations
  63. GRB060204B: Faulkes OT candidate
  64. GRB 060204B: ART optical limit
  65. GRB 060204A: further INTEGRAL results
  66. GRB060204B - SDSS pre-burst observations
  67. GRB 060203: Swift-BAT refined analysis
  68. GRB 060204B: Swift detection of a burst
  69. GRB 060204: a long GRB detected by INTEGRAL
  70. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  71. GRB 060203: RTT150 optical observations
  72. GRB060203: Swift XRT Team Refined Analysis
  73. GRB060203 - Swift UVOT observation
  74. Swift-BAT trigger is GRB 060203
  75. GRB 060203: IR Counterpart
  76. GRB060203: Observations with SARA
  77. GRB 060203: P60 Confirmation of Optical Afterglow
  78. Possible GRB 060203: candidate optical counterpart
  79. Possible GRB 060203: optical observations at Asiago
  80. GRB 060202: PROMPT Observations
  81. GRB 060202: GETS observation
  82. GRB 060202: Gemini-N J, H, K_s observations
  83. GRB 060202 : Kiso B and R band limit
  84. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  85. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  86. GRB 060202: Refined analysis of the Swift-BAT burst
  87. GRB 060202: Swift/UVOT upper limits
  88. GRB 060202: Swift XRT Team Refined Analysis
  89. GRB 060202 : Lulin R and I band limit
  90. GRB060202: Faulkes North observation
  91. GRB 060202: Swift detection of a burst
  92. GRB 060121: Gemini Late-time Observations
  93. Erratum: SDSS pre-burst observations of GRB fields
  94. GRB 060130: PROMPT Observations
  95. GRB 060130: Swift/XRT observation
  96. GRB 051211A: MDM Observations
  97. GRB 060123: Gemini spectroscopy of the putative host galaxy
  98. GRB 060123: VLA Radio Observations
  99. GRB060130: Optical imaging
  100. GRB060130: REM infrared observations

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