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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"

35324 results found.

  1. GRB 060719: Continued LCO optical observations
  2. GRB 060719: VLT observations
  3. GRB 060719: LCO optical observations
  4. GRB 060719: Swift detection of a burst
  5. GRB 060717: Swift XRT refined analysis
  6. GRB 060714: OA fading and a possible host detection
  7. GRB060714: optical observations
  8. GRB 060717: NOT observations
  9. GRB 060714: Refined analysis of the Swift-BAT burst
  10. GRB 060717 optical upper limit
  11. GRB060717: Swift/UVOT upper limits
  12. GRB 060717: Swift XRT refined position
  13. GRB 060717: Swift-BAT refined analysis
  14. GRB060717 - SDSS Pre-burst Observations
  15. GRB 060714: REM infrared observations
  16. GRB 060717, optical observation
  17. GRB 060717: Swift detection of a burst
  18. GRB060714: correction to GCN 5324
  19. GRB060714: optical observations
  20. GRB 060714, SMARTS optical/IR afterglow observation
  21. GRB 060714 : Liverpool Telescope Observations
  22. GRB 060714: Swift XRT refined analysis
  23. GRB 060714: OA redshift
  24. GRB 060708: VLT spectroscopy
  25. GRB060708: MARGE low resolution spectrum observations
  26. GRB060714: optical observations
  27. Swift-BAT trigger 219136 is not a GRB
  28. Correction to Circular 5314: Circular refers to GRB 060714
  29. GRB060707 possible optical confirmation
  30. Swift trigger 219136 is probably not a GRB
  31. GRB 060714, optical observation
  32. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  33. GRB 060605: SkyNet Optical Limits
  34. GRB060712: P60 Observations
  35. GRB 060712: XRT refined analysis
  36. GRB 060712: Swift/UVOT Upper Limits
  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. GRB 060707: Swift detection of a burst
  57. GRB 060515: Upper Limit on Host Galaxy
  58. GRB 050223: Magellan redshift
  59. GRB 060614: SMARTS host galaxy observations
  60. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  61. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  62. GRB 060109: Upper Limit on Host Galaxy
  63. GRB 060105: Upper limit on Host Galaxy
  64. GRB060614: Detection of the host galaxy but no supernova emission
  65. GRB 060614: redshift confirmation
  66. GRB 060614: Redshift
  67. Swift-BAT trigger 215279 is not a GRB
  68. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  69. GRB060614: Optical observations
  70. GRB 060614: spectroscopy
  71. GRB050326: Host Galaxy Candidates
  72. GRB050124: Possible Host Galaxy
  73. GRB050223: Host Galaxy
  74. GRB060512: near IR observations
  75. GRB060526: optical observations
  76. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  77. Konus-Wind observation of GRB 060614
  78. GRB060605: optical observation
  79. The Unusually Long-Lived Afterglow of GRB 060614
  80. GRB 060614: optical observations
  81. GRB 060605, optical observations
  82. GRB 060614, SMARTS optical/IR afterglow observation
  83. GRB060614: SSO 1m observations
  84. GRB060614: Watcher observation
  85. GRB 060614: Swift-BAT refined analysis
  86. GRB 060614: Swift/UVOT Observations
  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. GRB 060610: KAIT observations
  91. GRB 060607: RTT150 optical observations
  92. GRB 070706B: Watcher upper limit
  93. GRB 060607B: Swift-BAT Refined Analysis
  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: Swift-XRT Team refined analysis
  99. GRB 060607: IR observations
  100. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst

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