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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"

26507 results found.

  1. GRB 060210: optical evolution
  2. GRB 060210: Swift detection of a burst
  3. GRB060210: Optical afterglow
  4. GRB 060209 : TAROT optical observation
  5. GRB 060203: Swift/UVOT upper limits
  6. GRB 060121 : WIDGET Pre-trigger limit
  7. GRB060204a: Swift XRT Source is not GRB Afterglow
  8. GRB 060206: optical observations at Asiago
  9. GRB 060206: IR Detection of the Afterglow
  10. GRB 060206: Super-LOTIS observations
  11. GRB060204A: Swift/UVOT observations
  12. GRB 060206: Swift-BAT refined analysis
  13. GRB060206: SDSS Pre-Burst Observations
  14. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  15. GRB060206: Swift-BAT detection of a burst
  16. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  17. GRB060204C: optical observation
  18. GRB 060204A: Swift XRT upper limit
  19. GRB 060204A: FRAM optical observations
  20. GRB060204B: Swift/UVOT refined analysis
  21. GRB 060204C: optical observations
  22. Swift XRT Observation of GRB 060204C
  23. GRB 060204B: Swift-BAT refined analysis
  24. GRB 060204B: ART early limit
  25. GRB 060204b: Keck/LRIS Afterglow Confirmation
  26. GRB 060204C: Liverpool Telescopes optical limit
  27. GRB 060204C: Swift-BAT detection of a burst
  28. GRB 060204A: further INTEGRAL results
  29. GRB060204B, optical observation
  30. GRB060204B - SDSS pre-burst observations
  31. GRB 060203: Swift-BAT refined analysis
  32. GRB 060204B: Swift detection of a burst
  33. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  34. GRB 060203: RTT150 optical observations
  35. GRB 060203: IR Counterpart
  36. Possible GRB 060203: optical observations at Asiago
  37. GRB 060202: PROMPT Observations
  38. GRB 060202: GETS observation
  39. GRB 060202: Gemini-N J, H, K_s observations
  40. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  41. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  42. GRB 060202: Refined analysis of the Swift-BAT burst
  43. GRB060202, optical observation
  44. GRB 060202: Swift/UVOT upper limits
  45. GRB 060121: Gemini Late-time Observations
  46. GRB 060130: PROMPT Observations
  47. GRB060130: Further R-band imaging
  48. GRB 060130: Swift/XRT observation
  49. GRB 060123: Gemini spectroscopy of the putative host galaxy
  50. GRB060130: Optical imaging
  51. GRB060130: REM infrared observations
  52. GRB 060130, SMARTS optical observations
  53. GRB 060130: FRAM optical observations
  54. GRB 060130: further INTEGRAL IBIS results
  55. GRB 060121: Confirmation of NIR Afterglow
  56. GRB 060123: Swift refined analysis of an unusual GRB
  57. GRB060124, BVRcIc field calibration
  58. GRB 060121: Probable Detection of NIR Afterglow
  59. GRB 060116 HST observations
  60. GRB 060124: HETE detection and spectrum of the main peak
  61. GRB060124: detailed XRT analysis
  62. GRB 060124: ART optical limits during the burst
  63. GRB060123: Optical and IR Imaging
  64. GRB 060123: P200 Observations
  65. GRB 060124: XRT refined analysis
  66. GRB 060124: R band Observations
  67. GRB 060124 : Optical observation at Xinglong and Kiso
  68. GRB060124: optical observations at Asiago
  69. GRB060123: SDSS pre-burst observations
  70. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  71. GRB 060121: OHP optical limits
  72. GRB 060124: TAROT optical limits
  73. GRB060124, optical observation
  74. GRB 060124: Optical Observations at Tautenburg
  75. GRB 060117: Suzaku WAM observation of the prompt emission
  76. GRB 060111B: Suzaku WAM observation of the prompt emission
  77. GRB 060124: Swift-BAT detection of a burst
  78. GRB 060121: Liverpool Telescopes optical limits
  79. GRB 060121: Swift XRT refined analysis
  80. Konus-Wind observation of GRB 060121
  81. GRB 060121: candidate optical counterpart
  82. GRB 060121: Infrared Observations
  83. GRB 060121: optical observations
  84. GRB 060121: Optical imaging
  85. GRB060121 - SDSS pre-burst observations
  86. HETE Alert 4006: MASTER promt optical limit
  87. GRB060117 - ATCA 3/6cm radio limits - correction
  88. GRB060117 - ATCA 3/6cm radio limits
  89. GRB 060116: photometric redshift - the farthest GRB?
  90. Konus-Wind observation of GRB 060117
  91. GRB 060116: UKIRT IR Observations
  92. GRB 060117: Refined analysis of the Swift-BAT burst
  93. GRB 060117: FRAM optical afterglow candidate
  94. GRB 060117: nearby galaxy
  95. GRB 060116: VLT optical observations
  96. GRB 060116: Refined analysis of the Swift-BAT burst
  97. GRB 060116: XRT refined analysis
  98. GRB 060116: IR Candidate Afterglow
  99. GRB 060116: Swift/UVOT upper limits
  100. GRB060115: REM observations

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