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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"

28095 results found.

  1. GRB060805 Liverpool Telescope observations
  2. GRB 060805: optical upper limit in R
  3. GRB 060805: XRT Team Refined Analysis
  4. GRB 060805: Swift/UVOT Upper Limits
  5. GRB 060805: P60 Observations
  6. GRB 060805: Swift detection of a burst
  7. GRB 060804: Swift UVOT observations
  8. GRB 060804: Swift-XRT Team Refined Analysis
  9. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  10. GRB 060728: Upper limits of the X-ray emission
  11. GRB 060801: no variability of optical sources
  12. GRB 060801: WSRT Radio Observations
  13. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  14. GRB060801: Radio Observations
  15. GRB 051109B: Bright spiral host galaxy at low redshift
  16. GRB 060801: optical observations at FORS2/VLT
  17. GRB060801: Swift/UVOT Upper Limits
  18. GRB 060801: optical observations at Hanle and Calar Alto
  19. GRB060801: optical upper limit in R
  20. GRB 060801: Swift XRT refined analysis
  21. GRB 060801: Kanazawa Optical Observation
  22. GRB 060801: Swift detection of a short burst
  23. GRB 060218 / SN 2006aj Nebular Spectrum
  24. GRB 060729 redshift
  25. GRB 060729: Swift/UVOT Detections
  26. GRB 060729: Swift-XRT refined analysis
  27. GRB 060729: Swift/UVOT Observations
  28. GRB 060729: ROTSE-III Detection of Optical Counterpart
  29. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  30. GRB 060728: Refined analysis of the Swift-BAT burst
  31. Swift/XRT preliminary analysis
  32. GRB 060728: Swift detection of a burst
  33. GRB060614 ATCA Radio Limits
  34. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  35. GRB 060714: Swift/UVOT Observations
  36. GRB060719: prompt NIR observations with REM
  37. GRB 060714: NOT observations
  38. GRB 060719: near-infrared afterglow
  39. GRB 060522: VLA observation
  40. GRB 060719: Swift/UVOT Upper Limits
  41. GRB 060719: VLT/ISAAC observations
  42. GRB 060719: XRT refined analysis
  43. GRB 060719: further analysis of VLT observations
  44. GRB 060719: prompt PROMPT observations
  45. GRB060719: REM NIR Observations
  46. GRB 060719: Continued LCO optical observations
  47. GRB 060719: LCO optical observations
  48. GRB 060719: Swift detection of a burst
  49. GRB 060717: Swift XRT refined analysis
  50. GRB 060714: OA fading and a possible host detection
  51. GRB060714: optical observations
  52. GRB 060717: NOT observations
  53. GRB 060714: Refined analysis of the Swift-BAT burst
  54. GRB 060717 optical upper limit
  55. GRB060717: Swift/UVOT upper limits
  56. GRB 060717: Swift XRT refined position
  57. GRB 060714: REM infrared observations
  58. GRB 060717: Swift detection of a burst
  59. GRB060714: optical observations
  60. GRB 060714, SMARTS optical/IR afterglow observation
  61. GRB 060714 : Liverpool Telescope Observations
  62. GRB 060714: Swift XRT refined analysis
  63. GRB 060714: OA redshift
  64. GRB 060708: VLT spectroscopy
  65. GRB060708: MARGE low resolution spectrum observations
  66. Swift trigger 219136 is probably not a GRB
  67. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  68. GRB 060605: SkyNet Optical Limits
  69. GRB060712: P60 Observations
  70. GRB 060712: XRT refined analysis
  71. GRB 060712: Swift/UVOT Upper Limits
  72. GRB060526: optical observations
  73. GRB 060712: XRT refined position
  74. GRB 060712: Swift detection of a burst
  75. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  76. GRB 060708: PROMPT Optical Limits
  77. GRB 060707: OA fading and redshift
  78. GRB 060708: Swift-XRT refined analysis
  79. GCN 060708: Swift-UVOT Observations
  80. GCN 060707: Swift-UVOT observations
  81. GRB 060707: Swift-XRT refined analysis
  82. GRB 060708: Swift detection of a burst with an UVOT countpart
  83. GRB060707 possible optical confirmation
  84. GRB 060707: BOOTES-IR optical afterglow candidate
  85. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  86. GRB 060707: Swift detection of a burst
  87. GRB 060515: Upper Limit on Host Galaxy
  88. GRB 060614: SMARTS host galaxy observations
  89. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  90. GRB 060109: Upper Limit on Host Galaxy
  91. GRB 060105: Upper limit on Host Galaxy
  92. GRB060614: Detection of the host galaxy but no supernova emission
  93. GRB 060614: redshift confirmation
  94. GRB 060614: Redshift
  95. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  96. GRB060614: Optical observations
  97. GRB 060614: spectroscopy
  98. GRB050326: Host Galaxy Candidates
  99. GRB050124: Possible Host Galaxy
  100. GRB050223: Host Galaxy

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