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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"

37677 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. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  44. BAT GRB 060204C is probably not a GRB
  45. GRB060204C: optical observation
  46. GRB 060204B: BVRi-band detections of optical afterglow
  47. GRB 060204A: Swift XRT upper limit
  48. GRB 060204A: FRAM optical observations
  49. GRB060204B: Swift/UVOT refined analysis
  50. GRB 060204C: optical observations
  51. Swift XRT Observation of GRB 060204C
  52. GRB 060204B: Swift-BAT refined analysis
  53. GRB 060204B: ART early limit
  54. GRB060204B: Swift XRT Team Refined Analysis
  55. GRB 060204C: OSN limits
  56. GRB 060204b: Keck/LRIS Afterglow Confirmation
  57. GRB 060204C: BOOTES-IR optical limits
  58. GRB 060204C: Liverpool Telescopes optical limit
  59. GRB 060204C: ROTSE-III Optical Limits
  60. GRB 060204C: Swift-BAT detection of a burst
  61. GRB 060124: Radio Observations
  62. GRB060204B: Faulkes OT candidate
  63. GRB 060204B: ART optical limit
  64. GRB 060204A: further INTEGRAL results
  65. GRB060204B - SDSS pre-burst observations
  66. GRB 060203: Swift-BAT refined analysis
  67. GRB 060204B: Swift detection of a burst
  68. GRB 060204: a long GRB detected by INTEGRAL
  69. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  70. GRB 060203: RTT150 optical observations
  71. GRB060203: Swift XRT Team Refined Analysis
  72. Swift-BAT trigger is GRB 060203
  73. GRB 060203: IR Counterpart
  74. GRB060203: Observations with SARA
  75. GRB 060203: P60 Confirmation of Optical Afterglow
  76. Possible GRB 060203: candidate optical counterpart
  77. Possible GRB 060203: optical observations at Asiago
  78. GRB 060202: PROMPT Observations
  79. GRB 060202: GETS observation
  80. GRB 060202: Gemini-N J, H, K_s observations
  81. GRB 060202 : Kiso B and R band limit
  82. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  83. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  84. GRB 060202: Refined analysis of the Swift-BAT burst
  85. GRB 060202: Swift/UVOT upper limits
  86. GRB 060202: Swift XRT Team Refined Analysis
  87. GRB 060202 : Lulin R and I band limit
  88. GRB060202: Faulkes North observation
  89. GRB 060202: Swift detection of a burst
  90. GRB 060121: Gemini Late-time Observations
  91. Erratum: SDSS pre-burst observations of GRB fields
  92. GRB 060130: PROMPT Observations
  93. GRB 060130: Swift/XRT observation
  94. GRB 051211A: MDM Observations
  95. GRB 060123: Gemini spectroscopy of the putative host galaxy
  96. GRB 060123: VLA Radio Observations
  97. GRB060130: Optical imaging
  98. GRB060130: REM infrared observations
  99. GRB 060130, SMARTS optical observations
  100. GRB 060130: FRAM optical observations

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