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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"

36143 results found.

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

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