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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"

28231 results found.

  1. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  2. GRB 060211B: Swift/UVOT Upper Limits
  3. GRB060218 : SDSS pre-burst observations
  4. GRB 060218: Swift-BAT detection of a possible burst
  5. GRB 060213: optical afterglow not confirmed
  6. Swift UVOT observations of GRB060213
  7. GRB 060211B: Skynet Observations
  8. GRB060213: Swift XRT observations and possible afterglow candidate
  9. GRB 060213: IPN localization
  10. GRB060211B: REM optical and NIR observations
  11. GRB 060211A: Further refined analysis of the Swift burst
  12. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  13. GRB 060211b: P60 Observations
  14. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  15. GRB 050826: Optical Afterglow and Host Galaxy
  16. GRB 060210: Further refined analysis of the Swift-BAT burst
  17. GRB 060211B: Swift/BAT refined analysis
  18. GRB060210: Swift/UVOT Upper Limits
  19. GRB 060211B: Swift-XRT Team refined analysis
  20. GRB 060210: Optical Observations
  21. GRB 060211: Swift detection of a long burst
  22. GRB 060210: Refined analysis of the Swift-BAT burst
  23. GRB060210: Swift XRT Refined Analysis
  24. GRB 060210 : Xinglong and Lulin optical limit
  25. GRB 060210: optical evolution
  26. GRB 060210: Swift detection of a burst
  27. GRB060210: Optical afterglow
  28. GRB 060209 : TAROT optical observation
  29. GRB 060203: Swift/UVOT upper limits
  30. GRB 060121 : WIDGET Pre-trigger limit
  31. GRB060204a: Swift XRT Source is not GRB Afterglow
  32. GRB 060206: optical observations at Asiago
  33. GRB 060206: IR Detection of the Afterglow
  34. GRB 060206: Super-LOTIS observations
  35. GRB060204A: Swift/UVOT observations
  36. GRB 060206: Swift-BAT refined analysis
  37. GRB060206: SDSS Pre-Burst Observations
  38. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  39. GRB060206: Swift-BAT detection of a burst
  40. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  41. GRB060204C: optical observation
  42. GRB 060204A: Swift XRT upper limit
  43. GRB 060204A: FRAM optical observations
  44. GRB060204B: Swift/UVOT refined analysis
  45. GRB 060204C: optical observations
  46. Swift XRT Observation of GRB 060204C
  47. GRB 060204B: Swift-BAT refined analysis
  48. GRB 060204B: ART early limit
  49. GRB 060204b: Keck/LRIS Afterglow Confirmation
  50. GRB 060204C: Liverpool Telescopes optical limit
  51. GRB 060204C: Swift-BAT detection of a burst
  52. GRB 060204A: further INTEGRAL results
  53. GRB060204B, optical observation
  54. GRB060204B - SDSS pre-burst observations
  55. GRB 060203: Swift-BAT refined analysis
  56. GRB 060204B: Swift detection of a burst
  57. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  58. GRB 060203: RTT150 optical observations
  59. GRB 060203: IR Counterpart
  60. Possible GRB 060203: optical observations at Asiago
  61. GRB 060202: PROMPT Observations
  62. GRB 060202: GETS observation
  63. GRB 060202: Gemini-N J, H, K_s observations
  64. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  65. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  66. GRB 060202: Refined analysis of the Swift-BAT burst
  67. GRB060202, optical observation
  68. GRB 060202: Swift/UVOT upper limits
  69. GRB 060121: Gemini Late-time Observations
  70. GRB 060130: PROMPT Observations
  71. GRB060130: Further R-band imaging
  72. GRB 060130: Swift/XRT observation
  73. GRB 060123: Gemini spectroscopy of the putative host galaxy
  74. GRB060130: Optical imaging
  75. GRB060130: REM infrared observations
  76. GRB 060130, SMARTS optical observations
  77. GRB 060130: FRAM optical observations
  78. GRB 060130: further INTEGRAL IBIS results
  79. GRB 060121: Confirmation of NIR Afterglow
  80. GRB 060123: Swift refined analysis of an unusual GRB
  81. GRB060124, BVRcIc field calibration
  82. GRB 060121: Probable Detection of NIR Afterglow
  83. GRB 060116 HST observations
  84. GRB 060124: HETE detection and spectrum of the main peak
  85. GRB060124: detailed XRT analysis
  86. GRB 060124: ART optical limits during the burst
  87. GRB060123: Optical and IR Imaging
  88. GRB 060123: P200 Observations
  89. GRB 060124: XRT refined analysis
  90. GRB 060124: R band Observations
  91. GRB 060124 : Optical observation at Xinglong and Kiso
  92. GRB060124: optical observations at Asiago
  93. GRB060123: SDSS pre-burst observations
  94. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  95. GRB 060121: OHP optical limits
  96. GRB 060124: TAROT optical limits
  97. GRB060124, optical observation
  98. GRB 060124: Optical Observations at Tautenburg
  99. GRB 060117: Suzaku WAM observation of the prompt emission
  100. GRB 060111B: Suzaku WAM observation of the prompt emission

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