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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"

23446 results found.

  1. GRB 060218: Decline in r-band flux
  2. GRB 060218: Likely an underluminous GRB
  3. GRB060219: SARA Observations
  4. GRB 060219: Swift/UVOT Upper Limits
  5. GRB 051221B: Swift-XRT Team Refined Analysis
  6. GRB060218: Radio Afterglow Discovery
  7. GRB060219: SDSS pre-burst observations
  8. GRB 060219: Swift-BAT detection of a weak burst
  9. Oddball GRB 060218, transient or GRB?
  10. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  11. GRB 060218: Pre-burst detection of a possible host galaxy
  12. GRB060218: Swift/XRT refined position of a possible burst
  13. GRB 060211B: Swift/UVOT Upper Limits
  14. GRB060218 : SDSS pre-burst observations
  15. GRB 060218: Swift-BAT detection of a possible burst
  16. GRB 060213: optical afterglow not confirmed
  17. Swift UVOT observations of GRB060213
  18. GRB 060211B: Skynet Observations
  19. GRB 060213: optical afterglow candidate
  20. GRB060213: Swift XRT observations and possible afterglow candidate
  21. GRB 060211b: WIRO NIR Observations
  22. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  23. GRB 060213: IPN localization
  24. GRB 060210: Radio Observations
  25. GRB 060211a: WIRO NIR Observations
  26. GRB060211B: REM optical and NIR observations
  27. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  28. GRB 060211b: P60 Observations
  29. GRB060210: Swift/UVOT Upper Limits
  30. GRB 060210: Optical Observations
  31. GRB060211.7: MASTER_optical_observation under the snow
  32. GRB 060211B: Swift-BAT detection of a burst
  33. GRB 060211: ROTSE-III Optical Limits
  34. GRB 060211: Swift detection of a long burst
  35. GRB060210: Swift XRT Refined Analysis
  36. GRB060206, optical observations
  37. GRB 060210 : Xinglong and Lulin optical limit
  38. GRB 060210: Swift detection of a burst
  39. GRB060210: Optical afterglow
  40. GRB 060206: Swift/UVOT Observations
  41. GRB 060209 : TAROT optical observation
  42. GRB 060209(?): Swift-BAT detection of a possible burst
  43. GRB 060203: Swift/UVOT upper limits
  44. GRB 060206: TTT Observations
  45. GRB 060121 : WIDGET Pre-trigger limit
  46. GRB 060206: Tenagra II Observations
  47. GRB060204a: Swift XRT Source is not GRB Afterglow
  48. GRB 060206: IR Detection of the Afterglow
  49. GRB 060206: Lick 3m Spectroscopy
  50. GRB060204A: Swift/UVOT observations
  51. GRB060206: SDSS Pre-Burst Observations
  52. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  53. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  54. GRB060206: Swift-BAT detection of a burst
  55. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  56. GRB060204C: optical observation
  57. GRB 060204A: Swift XRT upper limit
  58. GRB 060204A: FRAM optical observations
  59. GRB060204B: Swift/UVOT refined analysis
  60. GRB 060204C: optical observations
  61. Swift XRT Observation of GRB 060204C
  62. GRB 060204B: ART early limit
  63. GRB060204B: Swift XRT Team Refined Analysis
  64. GRB 060204b: Keck/LRIS Afterglow Confirmation
  65. GRB 060204C: BOOTES-IR optical limits
  66. GRB 060204C: Liverpool Telescopes optical limit
  67. GRB 060204C: ROTSE-III Optical Limits
  68. GRB 060204C: Swift-BAT detection of a burst
  69. GRB 060124: Radio Observations
  70. GRB 060204B: ART optical limit
  71. GRB060204B, optical observation
  72. GRB060204B - SDSS pre-burst observations
  73. GRB 060204B: Swift detection of a burst
  74. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  75. GRB 060203: RTT150 optical observations
  76. GRB060203 - Swift UVOT observation
  77. GRB 060203: IR Counterpart
  78. Possible GRB 060203: optical observations at Asiago
  79. GRB 060202: PROMPT Observations
  80. GRB 060202: GETS observation
  81. GRB 060202: Gemini-N J, H, K_s observations
  82. GRB 060202 : Kiso B and R band limit
  83. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  84. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  85. GRB060202, optical observation
  86. GRB 060202: Swift/UVOT upper limits
  87. GRB 060202 : Lulin R and I band limit
  88. GRB 060202: Swift detection of a burst
  89. GRB 060121: Gemini Late-time Observations
  90. GRB 060130: PROMPT Observations
  91. GRB060130: Further R-band imaging
  92. GRB 060130: Swift/XRT observation
  93. GRB 060123: Gemini spectroscopy of the putative host galaxy
  94. GRB 060123: VLA Radio Observations
  95. GRB060130: Optical imaging
  96. GRB060130: REM infrared observations
  97. GRB 060130, SMARTS optical observations
  98. GRB 060130: FRAM optical observations
  99. GRB 060121: Confirmation of NIR Afterglow
  100. GRB060124, BVRcIc field calibration

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