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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"

26316 results found.

  1. GRB 060210: Further refined analysis of the Swift-BAT burst
  2. GRB 060211B: Swift/BAT refined analysis
  3. GRB060210: Swift/UVOT Upper Limits
  4. GRB 060211B: Swift-XRT Team refined analysis
  5. GRB 060210: Optical Observations
  6. GRB 060211: Swift detection of a long burst
  7. GRB 060210: Refined analysis of the Swift-BAT burst
  8. GRB060210: Swift XRT Refined Analysis
  9. GRB 060210 : Xinglong and Lulin optical limit
  10. GRB 060210: optical evolution
  11. GRB 060210: Swift detection of a burst
  12. GRB060210: Optical afterglow
  13. GRB 060209 : TAROT optical observation
  14. GRB 060203: Swift/UVOT upper limits
  15. GRB 060121 : WIDGET Pre-trigger limit
  16. GRB060204a: Swift XRT Source is not GRB Afterglow
  17. GRB 060206: optical observations at Asiago
  18. GRB 060206: IR Detection of the Afterglow
  19. GRB 060206: Super-LOTIS observations
  20. GRB060204A: Swift/UVOT observations
  21. GRB 060206: Swift-BAT refined analysis
  22. GRB060206: SDSS Pre-Burst Observations
  23. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  24. GRB060206: Swift-BAT detection of a burst
  25. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  26. GRB060204C: optical observation
  27. GRB 060204A: Swift XRT upper limit
  28. GRB 060204A: FRAM optical observations
  29. GRB060204B: Swift/UVOT refined analysis
  30. GRB 060204C: optical observations
  31. Swift XRT Observation of GRB 060204C
  32. GRB 060204B: Swift-BAT refined analysis
  33. GRB 060204B: ART early limit
  34. GRB 060204b: Keck/LRIS Afterglow Confirmation
  35. GRB 060204C: Liverpool Telescopes optical limit
  36. GRB 060204C: Swift-BAT detection of a burst
  37. GRB 060204A: further INTEGRAL results
  38. GRB060204B, optical observation
  39. GRB060204B - SDSS pre-burst observations
  40. GRB 060203: Swift-BAT refined analysis
  41. GRB 060204B: Swift detection of a burst
  42. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  43. GRB 060203: RTT150 optical observations
  44. GRB 060203: IR Counterpart
  45. Possible GRB 060203: optical observations at Asiago
  46. GRB 060202: PROMPT Observations
  47. GRB 060202: GETS observation
  48. GRB 060202: Gemini-N J, H, K_s observations
  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. GRB060202, optical observation
  53. GRB 060202: Swift/UVOT upper limits
  54. GRB 060121: Gemini Late-time Observations
  55. GRB 060130: PROMPT Observations
  56. GRB060130: Further R-band imaging
  57. GRB 060130: Swift/XRT observation
  58. GRB 060123: Gemini spectroscopy of the putative host galaxy
  59. GRB060130: Optical imaging
  60. GRB060130: REM infrared observations
  61. GRB 060130, SMARTS optical observations
  62. GRB 060130: FRAM optical observations
  63. GRB 060130: further INTEGRAL IBIS results
  64. GRB 060121: Confirmation of NIR Afterglow
  65. GRB 060123: Swift refined analysis of an unusual GRB
  66. GRB060124, BVRcIc field calibration
  67. GRB 060121: Probable Detection of NIR Afterglow
  68. GRB 060116 HST observations
  69. GRB 060124: HETE detection and spectrum of the main peak
  70. GRB060124: detailed XRT analysis
  71. GRB 060124: ART optical limits during the burst
  72. GRB060123: Optical and IR Imaging
  73. GRB 060123: P200 Observations
  74. GRB 060124: XRT refined analysis
  75. GRB 060124: R band Observations
  76. GRB 060124 : Optical observation at Xinglong and Kiso
  77. GRB060124: optical observations at Asiago
  78. GRB060123: SDSS pre-burst observations
  79. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  80. GRB 060121: OHP optical limits
  81. GRB 060124: TAROT optical limits
  82. GRB060124, optical observation
  83. GRB 060124: Optical Observations at Tautenburg
  84. GRB 060117: Suzaku WAM observation of the prompt emission
  85. GRB 060111B: Suzaku WAM observation of the prompt emission
  86. GRB 060124: Swift-BAT detection of a burst
  87. GRB 060121: Liverpool Telescopes optical limits
  88. GRB 060121: Swift XRT refined analysis
  89. Konus-Wind observation of GRB 060121
  90. GRB 060121: candidate optical counterpart
  91. GRB 060121: Infrared Observations
  92. GRB 060121: optical observations
  93. GRB 060121: Optical imaging
  94. GRB060121 - SDSS pre-burst observations
  95. HETE Alert 4006: MASTER promt optical limit
  96. GRB060117 - ATCA 3/6cm radio limits - correction
  97. GRB060117 - ATCA 3/6cm radio limits
  98. GRB 060116: photometric redshift - the farthest GRB?
  99. Konus-Wind observation of GRB 060117
  100. GRB 060116: UKIRT IR Observations

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