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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"

26514 results found.

  1. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  2. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  3. GRB 060206: SOAR Detections
  4. GRB 050826: Optical Afterglow and Host Galaxy
  5. GRB 060210: Further refined analysis of the Swift-BAT burst
  6. GRB 060211B: Swift/BAT refined analysis
  7. GRB060210: Swift/UVOT Upper Limits
  8. GRB 060210: Optical Observations
  9. GRB060211.7: MASTER_optical_observation under the snow
  10. GRB 060210: Refined analysis of the Swift-BAT burst
  11. GRB060210: Swift XRT Refined Analysis
  12. GRB060206, optical observations
  13. GRB060210: Early Optical Observations
  14. GRB060210: Optical afterglow
  15. GRB 060209 : TAROT optical observation
  16. GRB060209A: MASTER optical observation
  17. GRB 060203: Swift/UVOT upper limits
  18. GRB 060121 : WIDGET Pre-trigger limit
  19. Retraction of orphan GRB afterglow candidate
  20. Orphan GRB Afterglow candidate
  21. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  22. GRB 060206: IR Detection of the Afterglow
  23. GRB 060204A: ROSAT Pointing
  24. GRB060204A: Swift/UVOT observations
  25. GRB 060206: Swift-BAT refined analysis
  26. GRB060206: SDSS Pre-Burst Observations
  27. GRB060206: P60 Optical Observations
  28. GRB 060206: KAIT observations
  29. GRB060206: SARA Detection
  30. GRB 060206: RAPTOR observations of afterglow candidate variability.
  31. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  32. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  33. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  34. BAT GRB 060204C is probably not a GRB
  35. GRB060204B: Swift/UVOT refined analysis
  36. GRB 060204B: Swift-BAT refined analysis
  37. GRB060204B: Swift XRT Team Refined Analysis
  38. GRB 060204b: Keck/LRIS Afterglow Confirmation
  39. GRB 060204C: Liverpool Telescopes optical limit
  40. GRB 060124: Radio Observations
  41. GRB060204B - SDSS pre-burst observations
  42. GRB 060203: Swift-BAT refined analysis
  43. GRB 060204B: Swift detection of a burst
  44. GRB 060204: a long GRB detected by INTEGRAL
  45. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  46. GRB 060203: RTT150 optical observations
  47. GRB 060203: P60 Confirmation of Optical Afterglow
  48. GRB 060202: GETS observation
  49. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  50. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  51. GRB 060202: Refined analysis of the Swift-BAT burst
  52. GRB 060202: Swift XRT Team Refined Analysis
  53. GRB 060202: Swift detection of a burst
  54. GRB 060121: Gemini Late-time Observations
  55. GRB060130: Further R-band imaging
  56. GRB 051211A: MDM Observations
  57. GRB 060123: VLA Radio Observations
  58. GRB 060130: a long GRB detected with INTEGRAL
  59. Possible GRB 051221B: MDM Correction
  60. GRB050121b: optical observation
  61. GRB 060121: Confirmation of NIR Afterglow
  62. GRB 060123: Swift refined analysis of an unusual GRB
  63. GRB060105: refined analysis of the Suzaku observation
  64. GRB060124 optical observations
  65. GRB 060121: Probable Detection of NIR Afterglow
  66. GRB 060116 HST observations
  67. GRB 060124: HETE detection and spectrum of the main peak
  68. Refined XRT Position for GRB 060123
  69. Konus-Wind observation of GRB 060124
  70. GRB060124: detailed XRT analysis
  71. GRB 060124 Optical Observations
  72. GRB 060123: P200 Observations
  73. GRB 060124: Keck optical spectrum
  74. GRB 060124: Keck Absorption Redshift
  75. GRB 060124 : Optical observation at Xinglong and Kiso
  76. GRB060124: optical observations at Asiago
  77. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  78. GRB060123: SDSS pre-burst observations
  79. GRB 060121: OHP optical limits
  80. GRB 060124: TAROT optical limits
  81. GRB 060124: Swift/UVOT Observation
  82. GRB 060124: XRT position
  83. GRB 060117: Suzaku WAM observation of the prompt emission
  84. GRB060124:MASTER optical observation
  85. GRB 060111B: Suzaku WAM observation of the prompt emission
  86. GRB 060124: Swift-BAT detection of a burst
  87. GRB 060116: Radio Detection
  88. GRB 060116: MARGE optical observations
  89. GRB 060121: Liverpool Telescopes optical limits
  90. GRB 060121: Swift XRT refined analysis
  91. Konus-Wind observation of GRB 060121
  92. GRB 060121: optical observations
  93. GRB060121 - SDSS pre-burst observations
  94. GRB 060121 (=H4010): Results of preliminary spectral analysis
  95. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  96. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  97. HETE Alert 4006: MASTER promt optical limit
  98. GRB 060117: PROMPT Observations
  99. GRB 060116: photometric redshift - the farthest GRB?
  100. GRB 060117: pseudo-z from spectral parameters of the prompt emission

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