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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"

36947 results found.

  1. GRB 060719: LCO optical observations
  2. GRB 060719: Swift detection of a burst
  3. GRB 060717: Swift XRT refined analysis
  4. GRB 060714: OA fading and a possible host detection
  5. GRB060714: optical observations
  6. GRB 060717: NOT observations
  7. GRB 060714: Refined analysis of the Swift-BAT burst
  8. GRB 060717 optical upper limit
  9. GRB060717: Swift/UVOT upper limits
  10. GRB 060717: Swift XRT refined position
  11. GRB 060717: Swift-BAT refined analysis
  12. GRB060717 - SDSS Pre-burst Observations
  13. GRB 060714: REM infrared observations
  14. GRB 060717, optical observation
  15. GRB 060717: Swift detection of a burst
  16. GRB060714: correction to GCN 5324
  17. GRB060714: optical observations
  18. GRB 060714, SMARTS optical/IR afterglow observation
  19. GRB 060714 : Liverpool Telescope Observations
  20. GRB 060714: Swift XRT refined analysis
  21. GRB 060714: OA redshift
  22. GRB 060708: VLT spectroscopy
  23. GRB060708: MARGE low resolution spectrum observations
  24. GRB060714: optical observations
  25. Swift-BAT trigger 219136 is not a GRB
  26. Correction to Circular 5314: Circular refers to GRB 060714
  27. GRB060707 possible optical confirmation
  28. Swift trigger 219136 is probably not a GRB
  29. GRB 060714, optical observation
  30. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  31. GRB 060605: SkyNet Optical Limits
  32. GRB060712: P60 Observations
  33. GRB 060712: XRT refined analysis
  34. GRB 060712: Swift/UVOT Upper Limits
  35. GRB060526: optical observations
  36. GRB 060712: XRT refined position
  37. GRB 060712: Refined analysis of the Swift-BAT burst
  38. GRB060712: MASTER optical observation
  39. GRB120706: MASTER optical observation
  40. GRB 060712: Swift detection of a burst
  41. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  42. GRB 060708: PROMPT Optical Limits
  43. GRB 060707: OA fading and redshift
  44. GRB 060708: Swift-XRT refined analysis
  45. GCN 060708: Swift-UVOT Observations
  46. GRB 060708: Refined analysis of the Swift-BAT burst
  47. GCN 060707: Swift-UVOT observations
  48. GRB 060707: Swift-XRT refined analysis
  49. GRB 060708: Swift detection of a burst with an UVOT countpart
  50. GRB060707 possible optical confirmation
  51. GRB 060707: BOOTES-IR optical afterglow candidate
  52. GRB 060707: Refined analysis of the Swift-BAT burst
  53. GRB 060707: BOOTES-IR optical observation
  54. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  55. GRB 060707: Swift detection of a burst
  56. GRB 060515: Upper Limit on Host Galaxy
  57. GRB 050223: Magellan redshift
  58. GRB 060614: SMARTS host galaxy observations
  59. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  60. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  61. GRB 060109: Upper Limit on Host Galaxy
  62. GRB 060105: Upper limit on Host Galaxy
  63. GRB060614: Detection of the host galaxy but no supernova emission
  64. GRB 060614: redshift confirmation
  65. GRB 060614: Redshift
  66. Swift-BAT trigger 215279 is not a GRB
  67. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  68. GRB060614: Optical observations
  69. GRB 060614: spectroscopy
  70. GRB050326: Host Galaxy Candidates
  71. GRB050124: Possible Host Galaxy
  72. GRB050223: Host Galaxy
  73. GRB060512: near IR observations
  74. GRB060526: optical observations
  75. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  76. Konus-Wind observation of GRB 060614
  77. GRB060605: optical observation
  78. The Unusually Long-Lived Afterglow of GRB 060614
  79. GRB 060614: optical observations
  80. GRB 060605, optical observations
  81. GRB 060614, SMARTS optical/IR afterglow observation
  82. GRB060614: SSO 1m observations
  83. GRB060614: Watcher observation
  84. GRB 060614: Swift-BAT refined analysis
  85. GRB 060614: Swift/UVOT Observations
  86. GRB060614: Swift-XRT refined analysis
  87. GRB 060604, optical observations
  88. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  89. GRB 060602A: Swift/XRT analysis
  90. BAT Trigger #214277 is SGR 1900+14
  91. GRB 060610: KAIT observations
  92. GRB 060607: RTT150 optical observations
  93. GRB 070706B: Watcher upper limit
  94. GRB 060607B: Swift-BAT Refined Analysis
  95. GRB060602A: Swift/UVOT upper limits
  96. GRB 060607B: Swift detection of a burst
  97. GCN 060607: Swift-UVOT obswervations.
  98. GRB 060607: Swift-BAT Refined Analysis
  99. GRB 060607: optical limit by "Pi of the Sky"
  100. GRB 060607: Swift-XRT Team refined analysis

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