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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"

21962 results found.

  1. GRB060904 - SDSS Pre-Burst Observations
  2. GRB060901: Optical observations
  3. 060901: Swift UVOT followup observations
  4. GRB 060901: SMARTS optical/IR observations update
  5. GRB 060901: Swift/XRT Refined Analysis
  6. GRB 060901: SMARTS optical/IR observations
  7. GRB 060901: Swift/XRT Position
  8. GRB 060901: Watcher observations
  9. GRB 060605, observations using an Integral Field Unit
  10. GRB 060825: VLA observations
  11. GRB060826 - SDSS Pre-Burst Observations
  12. GRB060825: Liverpool Telescope optical observations
  13. GRB 060825: TNG optical observations
  14. GRB 060825: TAROT optical observations
  15. GRB 060825: P60 Observations
  16. GRB060825: BOOTES-IR optical observations
  17. GRB060801: host galaxy redshift
  18. Radio observations of GRB 060719
  19. GRB 060729, SMARTS optical/IR observations
  20. GRB 060814: Confirmation of IR afterglow
  21. GRB 060814: P60 Observations
  22. GRB 060814: P200 NIR Observations
  23. GRB 060814: Possible IR counterpart
  24. GRB060805B: optical observations
  25. GRB 060814: VLT optical limits
  26. GRB 060814 - SDSS Pre-Burst Observations
  27. GRB 060814: TAROT optical observations
  28. GRB051109B: Late-time Radio Observations
  29. Second VLA limit on new radio point source in SGR 1806-20
  30. GRB060807: Possible Highly Significant X-ray Emission Lines
  31. GRB060714: optical observations
  32. GRB 060729: An update on the Swift XRT and UVOT observations
  33. GRB060717: optical observations
  34. GRB060807: Optical limiting magnitudes
  35. GRB 060805B: XRT Team Analysis
  36. GRB 060807: K- and R-band observations
  37. GRB060806 = SGR1806-20
  38. GRB060807 - SDSS Pre-burst Observations
  39. GRB 060807: Kanazawa R-band observation
  40. GRB 060801: Second Epoch WSRT Radio Observations
  41. GRB060805 Liverpool Telescope observations
  42. GRB 060805: P60 Observations
  43. GRB 060805: KAIT observations
  44. GRB 060805 - SDSS Pre-Burst Observations
  45. GRB 060804: Swift UVOT observations
  46. GRB 060728: Upper limits of the X-ray emission
  47. GRB 060801: WSRT Radio Observations
  48. GRB060801: Radio Observations
  49. GRB 051109B: Bright spiral host galaxy at low redshift
  50. GRB 060801: optical observations at FORS2/VLT
  51. GRB 060801: optical observations at Hanle and Calar Alto
  52. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  53. GRB 060218 / SN 2006aj Nebular Spectrum
  54. GRB 060729 redshift
  55. GRB 060729: Swift/UVOT Observations
  56. GRB 060728, SMARTS optical/IR observations
  57. Swift/XRT preliminary analysis
  58. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  59. GRB 060714: Swift/UVOT Observations
  60. GRB060719: prompt NIR observations with REM
  61. GRB 060714: NOT observations
  62. GRB 060719: near-infrared afterglow
  63. GRB 060719: VLT/ISAAC observations
  64. GRB 060719: further analysis of VLT observations
  65. GRB 060719: prompt PROMPT observations
  66. GRB060719: REM NIR Observations
  67. GRB 060719: Continued LCO optical observations
  68. GRB 060719: VLT observations
  69. GRB 060719: LCO optical observations
  70. GRB060714: optical observations
  71. GRB 060717: NOT observations
  72. GRB060717 - SDSS Pre-burst Observations
  73. GRB 060714: REM infrared observations
  74. GRB060714: optical observations
  75. GRB 060714 : Liverpool Telescope Observations
  76. GRB 060708: VLT spectroscopy
  77. GRB060708: MARGE low resolution spectrum observations
  78. GRB060714: optical observations
  79. GRB 060605: SkyNet Optical Limits
  80. GRB060712: P60 Observations
  81. GRB 060712: Swift/UVOT Upper Limits
  82. GRB060526: optical observations
  83. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  84. GCN 060708: Swift-UVOT Observations
  85. GCN 060707: Swift-UVOT observations
  86. GRB 060707: BOOTES-IR optical observation
  87. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  88. GRB 060515: Upper Limit on Host Galaxy
  89. GRB 050223: Magellan redshift
  90. GRB 060614: SMARTS host galaxy observations
  91. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  92. GRB 060109: Upper Limit on Host Galaxy
  93. GRB 060105: Upper limit on Host Galaxy
  94. GRB060614: Detection of the host galaxy but no supernova emission
  95. GRB 060614: Redshift
  96. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  97. GRB060614: Optical observations
  98. GRB 060614: spectroscopy
  99. GRB050326: Host Galaxy Candidates
  100. GRB050124: Possible Host Galaxy

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