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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"

36145 results found.

  1. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  2. GRB 060728: Swift/UVOT Upper Limits
  3. GRB 060728: Refined analysis of the Swift-BAT burst
  4. GRB 060728, SMARTS optical/IR observations
  5. GRB 060728: Swift detection of a burst
  6. GRB060614 ATCA Radio Limits
  7. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  8. GRB 060714: Swift/UVOT Observations
  9. GRB 060714: NOT observations
  10. GRB 060719: near-infrared afterglow
  11. GRB 060719: correction to the coordinates reported in GCN 5347
  12. GRB 060522: VLA observation
  13. GRB 060719: Swift/UVOT Upper Limits
  14. GRB 060719: VLT/ISAAC observations
  15. GRB 060719: Refined analysis of the Swift-BAT burst
  16. GRB 060719: XRT refined analysis
  17. GRB 060719: further analysis of VLT observations
  18. GRB 060719: optical limit by Pi-of-the-Sky
  19. GRB060719: FRAM early follow-up limit
  20. GRB 060719: prompt PROMPT observations
  21. GRB060719: REM NIR Observations
  22. GRB 060719: Continued LCO optical observations
  23. GRB 060719: VLT observations
  24. GRB 060719: LCO optical observations
  25. GRB 060719: Swift detection of a burst
  26. GRB 060717: Swift XRT refined analysis
  27. GRB 060714: OA fading and a possible host detection
  28. GRB060714: optical observations
  29. GRB 060717: NOT observations
  30. GRB 060714: Refined analysis of the Swift-BAT burst
  31. GRB 060717 optical upper limit
  32. GRB060717: Swift/UVOT upper limits
  33. GRB 060717: Swift XRT refined position
  34. GRB 060717: Swift-BAT refined analysis
  35. GRB060717 - SDSS Pre-burst Observations
  36. GRB 060714: REM infrared observations
  37. GRB 060717, optical observation
  38. GRB 060717: Swift detection of a burst
  39. GRB060714: correction to GCN 5324
  40. GRB060714: optical observations
  41. GRB 060714, SMARTS optical/IR afterglow observation
  42. GRB 060714 : Liverpool Telescope Observations
  43. GRB 060714: Swift XRT refined analysis
  44. GRB 060714: OA redshift
  45. GRB 060708: VLT spectroscopy
  46. GRB060708: MARGE low resolution spectrum observations
  47. GRB060714: optical observations
  48. Swift-BAT trigger 219136 is not a GRB
  49. Correction to Circular 5314: Circular refers to GRB 060714
  50. GRB060707 possible optical confirmation
  51. Swift trigger 219136 is probably not a GRB
  52. GRB 060714, optical observation
  53. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  54. GRB 060605: SkyNet Optical Limits
  55. GRB060712: P60 Observations
  56. GRB 060712: XRT refined analysis
  57. GRB 060712: Swift/UVOT Upper Limits
  58. GRB060526: optical observations
  59. GRB 060712: XRT refined position
  60. GRB 060712: Refined analysis of the Swift-BAT burst
  61. GRB060712: MASTER optical observation
  62. GRB120706: MASTER optical observation
  63. GRB 060712: Swift detection of a burst
  64. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  65. GRB 060708: PROMPT Optical Limits
  66. GRB 060707: OA fading and redshift
  67. GRB 060708: Swift-XRT refined analysis
  68. GCN 060708: Swift-UVOT Observations
  69. GRB 060708: Refined analysis of the Swift-BAT burst
  70. GCN 060707: Swift-UVOT observations
  71. GRB 060707: Swift-XRT refined analysis
  72. GRB 060708: Swift detection of a burst with an UVOT countpart
  73. GRB060707 possible optical confirmation
  74. GRB 060707: BOOTES-IR optical afterglow candidate
  75. GRB 060707: Refined analysis of the Swift-BAT burst
  76. GRB 060707: BOOTES-IR optical observation
  77. GRB 060707: Swift detection of a burst
  78. GRB 060515: Upper Limit on Host Galaxy
  79. GRB 050223: Magellan redshift
  80. GRB 060614: SMARTS host galaxy observations
  81. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  82. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  83. GRB 060109: Upper Limit on Host Galaxy
  84. GRB 060105: Upper limit on Host Galaxy
  85. GRB060614: Detection of the host galaxy but no supernova emission
  86. GRB 060614: redshift confirmation
  87. GRB 060614: Redshift
  88. Swift-BAT trigger 215279 is not a GRB
  89. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  90. GRB060614: Optical observations
  91. GRB 060614: spectroscopy
  92. GRB050326: Host Galaxy Candidates
  93. GRB050124: Possible Host Galaxy
  94. GRB050223: Host Galaxy
  95. GRB060512: near IR observations
  96. GRB060526: optical observations
  97. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  98. Konus-Wind observation of GRB 060614
  99. GRB060605: optical observation
  100. The Unusually Long-Lived Afterglow of GRB 060614

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