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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"

12054 results found.

  1. GRB 060510B: Swift/UVOT Upper Limits
  2. GRB 060507: Swift/UVOT Upper Limits
  3. GRB 060507: MDM Optical Upper Limit
  4. GRB060505: Swift/UVOT Observations
  5. GRB 060502B: Swift/UVOT upper limits
  6. GRB 060502A: Swift/UVOT source detection
  7. GRB 060427B Milagro GeV/TeV Observations
  8. GRB060501: Swift UVOT followup observations
  9. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  10. GRB 060428B: Xinglong I-band limit
  11. GRB060428A: Swift/UVOT observations.
  12. GRB060428B, optical observation
  13. GRB 060428B: Swift detection of a burst
  14. GRB 060428: Swift detection of a burst
  15. GRB 060427: Swift/UVOT upper limits.
  16. GRB 060427: Swift detection of a burst
  17. GRB060421: Swift/UVOT observations
  18. GRB(?) 060421: Swift detection of a burst
  19. GRB060413: Swift/UVOT upper limits
  20. SGR 1900+14: Swift detection of an outburst
  21. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  22. GRB 060403: Swift/UVOT upper limits
  23. SGR 1900+14: BAT observations
  24. GRB 060403: Swift detection of a burst
  25. GRB060331: Swift/UVOT upper limits
  26. GRB 060322: Confirmation of Swift XRT afterglow
  27. GRB060323: optical limit
  28. GRB060323: NOT optical observations
  29. GRB060319: Swift/UVOT upper limits
  30. GRB 060319: Swift detection of a burst
  31. GRB060313: Radio Observations
  32. GRB 060313: early afterglow NIR upper limits with REM
  33. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  34. GRB 060313: Swift/UVOT Observations
  35. GRB 060313: Swift-BAT detection of a bright short hard burst
  36. Swift/UVOT observations of GRB060306
  37. GRB 060306: Swift detection of a bright burst
  38. GRB 060218 : GMRT observation [Correction and Improvement]
  39. GRB 060223b: Swift/UVOT Upper Limits
  40. GRB 060218 : Radio upper limits from GMRT
  41. GRB 060204B: GETS early limit
  42. GRB 060223B: ART optical limits
  43. GRB 060223a: Swift/UVOT refined analysis
  44. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  45. GRB 060219: Swift/UVOT Upper Limits
  46. GRB 051221B: Swift-XRT Team Refined Analysis
  47. GRB 060219: Swift-BAT detection of a weak burst
  48. GRB 060211B: Swift/UVOT Upper Limits
  49. Swift UVOT observations of GRB060213
  50. GRB060213: MASTER final result
  51. GRB 060211b: WIRO NIR Observations
  52. GRB060213:_MASTER_optical_observation
  53. GRB 060211a: WIRO NIR Observations
  54. GRB060211B: REM optical and NIR observations
  55. GRB060210: Swift/UVOT Upper Limits
  56. GRB 060211B: Swift-BAT detection of a burst
  57. GRB 060211: Swift detection of a long burst
  58. GRB 060210: Swift detection of a burst
  59. GRB 060206: Swift/UVOT Observations
  60. GRB060209A: MASTER optical observation
  61. GRB 060209(?): Swift-BAT detection of a possible burst
  62. GRB 060203: Swift/UVOT upper limits
  63. GRB060204a: Swift XRT Source is not GRB Afterglow
  64. GRB 060206: Lick 3m Spectroscopy
  65. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  66. GRB 060204A: Swift XRT upper limit
  67. GRB060204B: Swift/UVOT refined analysis
  68. Swift XRT Observation of GRB 060204C
  69. GRB060204B, optical observation
  70. GRB 060204B: Swift detection of a burst
  71. GRB060203 - Swift UVOT observation
  72. GRB 060202: GETS observation
  73. GRB 060202: Swift/UVOT upper limits
  74. GRB 060202: Swift detection of a burst
  75. GRB060130: Further R-band imaging
  76. GRB 060130: Swift/XRT observation
  77. GRB060124: optical observation
  78. GRB 060116 HST observations
  79. GRB 060123: Swift detection of a very long, faint burst
  80. GRB060124:MASTER optical observation
  81. GRB 060121: Swift/UVOT upper limits
  82. GRB060108: photometric redshift determination
  83. GRB 060116: Swift/UVOT upper limits
  84. GRB060115: REM observations
  85. GRB 060116: Swift-BAT detection of a burst
  86. GRB 060115: Swift/UVOT upper limits
  87. GRB 060114: REM observations
  88. GRB 060114: Swift/UVOT Observations
  89. GRB 060114: Swift XRT upper limit
  90. GRB 060111A: refined UVOT anaysis
  91. GRB060111A: RTT150 optical observations
  92. GRB 060111: Swift detection of a burst
  93. GRB 060108: z-band imaging from Gemini-North
  94. GRB 060110: Super-LOTIS observations
  95. GRB 060109: Swift/UVOT upper limits
  96. GRB 060108: ISAS early observations and near IR upper limit
  97. Swift UVOT correction to GCN 4455
  98. GRB 060109: Swift Detection of a long burst
  99. GRB 060108: Mitsume optical observations
  100. GRB 060108: Swift/UVOT upper limits

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