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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"

35427 results found.

  1. GRB060719: FRAM early follow-up limit
  2. GRB 060719: prompt PROMPT observations
  3. GRB060719: REM NIR Observations
  4. GRB 060719: Continued LCO optical observations
  5. GRB 060719: VLT observations
  6. GRB 060719: LCO optical observations
  7. GRB 060719: Swift detection of a burst
  8. GRB 060717: Swift XRT refined analysis
  9. GRB 060714: OA fading and a possible host detection
  10. GRB060714: optical observations
  11. GRB 060717: NOT observations
  12. GRB 060714: Refined analysis of the Swift-BAT burst
  13. GRB 060717 optical upper limit
  14. GRB060717: Swift/UVOT upper limits
  15. GRB 060717: Swift XRT refined position
  16. GRB 060717: Swift-BAT refined analysis
  17. GRB060717 - SDSS Pre-burst Observations
  18. GRB 060714: REM infrared observations
  19. GRB 060717, optical observation
  20. GRB 060717: Swift detection of a burst
  21. GRB060714: correction to GCN 5324
  22. GRB060714: optical observations
  23. GRB 060714, SMARTS optical/IR afterglow observation
  24. GRB 060714 : Liverpool Telescope Observations
  25. GRB 060714: Swift XRT refined analysis
  26. GRB 060714: OA redshift
  27. GRB 060708: VLT spectroscopy
  28. GRB060708: MARGE low resolution spectrum observations
  29. GRB060714: optical observations
  30. Swift-BAT trigger 219136 is not a GRB
  31. Correction to Circular 5314: Circular refers to GRB 060714
  32. GRB060707 possible optical confirmation
  33. Swift trigger 219136 is probably not a GRB
  34. GRB 060714, optical observation
  35. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  36. GRB 060605: SkyNet Optical Limits
  37. GRB060712: P60 Observations
  38. GRB 060712: XRT refined analysis
  39. GRB 060712: Swift/UVOT Upper Limits
  40. GRB060526: optical observations
  41. GRB 060712: XRT refined position
  42. GRB 060712: Refined analysis of the Swift-BAT burst
  43. GRB060712: MASTER optical observation
  44. GRB120706: MASTER optical observation
  45. GRB 060712: Swift detection of a burst
  46. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  47. GRB 060708: PROMPT Optical Limits
  48. GRB 060707: OA fading and redshift
  49. GRB 060708: Swift-XRT refined analysis
  50. GCN 060708: Swift-UVOT Observations
  51. GRB 060708: Refined analysis of the Swift-BAT burst
  52. GCN 060707: Swift-UVOT observations
  53. GRB 060707: Swift-XRT refined analysis
  54. GRB 060708: Swift detection of a burst with an UVOT countpart
  55. GRB060707 possible optical confirmation
  56. GRB 060707: BOOTES-IR optical afterglow candidate
  57. GRB 060707: Refined analysis of the Swift-BAT burst
  58. GRB 060707: BOOTES-IR optical observation
  59. GRB 060707: Swift detection of a burst
  60. GRB 060515: Upper Limit on Host Galaxy
  61. GRB 050223: Magellan redshift
  62. GRB 060614: SMARTS host galaxy observations
  63. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  64. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  65. GRB 060109: Upper Limit on Host Galaxy
  66. GRB 060105: Upper limit on Host Galaxy
  67. GRB060614: Detection of the host galaxy but no supernova emission
  68. GRB 060614: redshift confirmation
  69. GRB 060614: Redshift
  70. Swift-BAT trigger 215279 is not a GRB
  71. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  72. GRB060614: Optical observations
  73. GRB 060614: spectroscopy
  74. GRB050326: Host Galaxy Candidates
  75. GRB050124: Possible Host Galaxy
  76. GRB050223: Host Galaxy
  77. GRB060512: near IR observations
  78. GRB060526: optical observations
  79. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  80. Konus-Wind observation of GRB 060614
  81. GRB060605: optical observation
  82. The Unusually Long-Lived Afterglow of GRB 060614
  83. GRB 060614: optical observations
  84. GRB 060605, optical observations
  85. GRB 060614, SMARTS optical/IR afterglow observation
  86. GRB060614: SSO 1m observations
  87. GRB060614: Watcher observation
  88. GRB 060614: Swift-BAT refined analysis
  89. GRB 060614: Swift/UVOT Observations
  90. GRB 060604, optical observations
  91. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  92. GRB 060602A: Swift/XRT analysis
  93. GRB 060610: KAIT observations
  94. GRB 060607: RTT150 optical observations
  95. GRB 070706B: Watcher upper limit
  96. GRB 060607B: Swift-BAT Refined Analysis
  97. GRB 060607B: Swift detection of a burst
  98. GCN 060607: Swift-UVOT obswervations.
  99. GRB 060607: Swift-BAT Refined Analysis
  100. GRB 060607: optical limit by "Pi of the Sky"

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