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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"

41689 results found.

  1. GRB 060522: VLA observation
  2. GRB 060719: Swift/UVOT Upper Limits
  3. GRB 060719: VLT/ISAAC observations
  4. GRB 060719: Refined analysis of the Swift-BAT burst
  5. GRB 060719: XRT refined analysis
  6. GRB 060719: further analysis of VLT observations
  7. GRB 060719: optical limit by Pi-of-the-Sky
  8. GRB060719: FRAM early follow-up limit
  9. GRB 060719: prompt PROMPT observations
  10. GRB060719: REM NIR Observations
  11. GRB 060719: Continued LCO optical observations
  12. GRB 060719: VLT observations
  13. GRB 060719: LCO optical observations
  14. GRB 060719: Swift detection of a burst
  15. GRB 060717: Swift XRT refined analysis
  16. GRB 060714: OA fading and a possible host detection
  17. GRB 060717: NOT observations
  18. GRB 060714: Refined analysis of the Swift-BAT burst
  19. GRB060717: Swift/UVOT upper limits
  20. GRB 060717: Swift XRT refined position
  21. GRB 060717: Swift-BAT refined analysis
  22. GRB060717 - SDSS Pre-burst Observations
  23. GRB 060714: REM infrared observations
  24. GRB 060717: Swift detection of a burst
  25. GRB 060714, SMARTS optical/IR afterglow observation
  26. GRB 060714 : Liverpool Telescope Observations
  27. GRB 060714: Swift XRT refined analysis
  28. GRB 060714: OA redshift
  29. GRB 060708: VLT spectroscopy
  30. GRB060708: MARGE low resolution spectrum observations
  31. GRB060714: optical observations
  32. GRB060707 possible optical confirmation
  33. Swift trigger 219136 is probably not a GRB
  34. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  35. GRB 060605: SkyNet Optical Limits
  36. GRB060712: P60 Observations
  37. GRB060526: optical observations
  38. GRB 060712: XRT refined position
  39. GRB 060712: Refined analysis of the Swift-BAT burst
  40. GRB060712: MASTER optical observation
  41. GRB120706: MASTER optical observation
  42. GRB 060712: Swift detection of a burst
  43. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  44. GRB 060708: PROMPT Optical Limits
  45. GRB 060707: OA fading and redshift
  46. GRB 060708: Swift-XRT refined analysis
  47. GCN 060708: Swift-UVOT Observations
  48. GRB 060708: Refined analysis of the Swift-BAT burst
  49. GCN 060707: Swift-UVOT observations
  50. GRB 060707: Swift-XRT refined analysis
  51. GRB 060708: Swift detection of a burst with an UVOT countpart
  52. GRB060707 possible optical confirmation
  53. GRB 060707: BOOTES-IR optical afterglow candidate
  54. GRB 060707: Refined analysis of the Swift-BAT burst
  55. GRB 060707: BOOTES-IR optical observation
  56. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  57. GRB 060707: Swift detection of a burst
  58. GRB 060515: Upper Limit on Host Galaxy
  59. GRB 050223: Magellan redshift
  60. GRB 060614: SMARTS host galaxy observations
  61. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  62. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  63. GRB 060109: Upper Limit on Host Galaxy
  64. GRB 060105: Upper limit on Host Galaxy
  65. GRB060614: Detection of the host galaxy but no supernova emission
  66. GRB 060614: Redshift
  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. Konus-Wind observation of GRB 060614
  76. GRB060605: optical observation
  77. The Unusually Long-Lived Afterglow of GRB 060614
  78. GRB 060614: optical observations
  79. GRB 060605, optical observations
  80. GRB 060614, SMARTS optical/IR afterglow observation
  81. GRB060614: SSO 1m observations
  82. GRB060614: Watcher observation
  83. GRB 060614: Swift-BAT refined analysis
  84. GRB 060614: Swift/UVOT Observations
  85. GRB060614: Swift-XRT refined analysis
  86. GRB 060604, optical observations
  87. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  88. GRB 060602A: Swift/XRT analysis
  89. BAT Trigger #214277 is SGR 1900+14
  90. GRB 060610: KAIT observations
  91. GRB 070706B: Watcher upper limit
  92. GRB 060607B: Swift-BAT Refined Analysis
  93. GRB060602A: Swift/UVOT upper limits
  94. GRB 060607B: Swift detection of a burst
  95. GCN 060607: Swift-UVOT obswervations.
  96. GRB 060607: Swift-BAT Refined Analysis
  97. GRB 060607: optical limit by "Pi of the Sky"
  98. GRB 060607: IR observations
  99. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  100. VLT/UVES observations of GRB 060607

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