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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"

28233 results found.

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

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