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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"

20951 results found.

  1. XRF 101117A: Palomar Transient Factory Observations
  2. GRB101114A: Swift/UVOT Upper Limits
  3. XRF101117A: MAXI/GSC detection of a short X-ray transient
  4. GRB 101114A: GROND Upper limits
  5. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  6. GRB 101112A: optical observations
  7. GRB 10112A: MASTER optical observations
  8. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  9. GRB 100906A: optical observations
  10. GRB 101030A : MOA optical observation
  11. GRB 101030A: GROND optical/NIR afterglow candidate
  12. GRB 101030A: Swift/UVOT Upper Limits
  13. GRB 090111, the review of the sky area in plate archives (1976-1996)
  14. GRB 101024A: GROND optical/NIR observations
  15. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  16. GRB 101024A: Zadko observatory - Gingin. Optical observations
  17. GRB 101023A: miniTAO/ANIR NIR detection
  18. GRB101024A: Swift/UVOT
  19. GRB 101024A: GRAS06 optical observations
  20. Swift/UVOT observations of GRB101023A
  21. GGRB 101023A: GROND detection of the optical-NIR afterglow
  22. GRB 101023A: Gemini discovery of optical afterglow
  23. GRB 101023A: REM NIR observations
  24. GRB 101020A: MASTER polarization optical observations
  25. GRB 101017A: miniTAO/ANIR NIR upper limits
  26. GRB 101017A: Swift/UVOT Observations
  27. GRB 101008A: optical observations
  28. GRB 101011A: BOOTES-3 Upper Limit
  29. GRB 101011A: Swift/UVOT observations
  30. GRB 101011A, GROND upper limits
  31. GRB 101011A: Zadko observatory - Gingin optical observations
  32. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  33. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  34. GRB 101008A: MASTER prompt optical observations
  35. GRB101008A, GROND detection of a fading afterglow
  36. GRB 101008A: SAO RAS optical observations
  37. GRB 101008: Swift/UVOT Upper Limits
  38. GRB 101008A: 1.23m CAHA optical observations
  39. GRB 100728B: X-shooter redshift
  40. GRB 100925A / MAXI J1659-152: MASTER optical observations
  41. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  42. GRB 100925A / MAXI J1659-152: SARA-S Observations
  43. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  44. GRB 100925A/MAXI J1659-152 - NOT optical observations
  45. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  46. GRB 100924A: GROND detection of an optical/NIR afterglow
  47. GRB 100917A: TAROT La Silla observatory optical observations
  48. GRB 100915A: TAROT Calern observatory optical observations
  49. GRB 100915A: Swift/UVOT Upper Limits
  50. GRB 100909A: Swift/UVOT observations
  51. GRB 100901A: errata of GRB name in GCN 11270
  52. GRB 100901A: optical observations in Mondy and R-light curve
  53. GRB 100906A: optical observations at Mt.Terskol
  54. GRB 100901A: optical observation in Maidanak, break confirmation
  55. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  56. GRB 100909A: Swift target of opportunity observation
  57. GRB100906A: detection at 15GHz
  58. GRB100901A: IAO optical upper limits at 4 days after the burst
  59. GRB 100901A: Confirmation of WSRT Radio Detection
  60. GRB 100901A: CrAO optical observations
  61. GRB 100906A: RTT150 optical observations
  62. GRB 100906A: GRAS-007 optical observations
  63. GRB100906A: R band observations
  64. GRB100906A: Optical observations at IAO
  65. GRB 100906A: TLS Monitoring
  66. GRB 100901A: TLS Detection at 5.5 days
  67. GRB 100906A: Observations at the Virtual Telescope
  68. GRB 100906A: Swift/UVOT Observations
  69. GRB 100906A: Ondrejov 65cm observations
  70. GRB 100906A: TLS Multicolor Observations
  71. GRB 100905A: Swift/UVOT Upper Limits
  72. GRB 100901A: TLS observations, SDSS calibration, decay slope
  73. GRB 100906A: MASTER preliminary prompt+afterglow lc
  74. GRB 100901A: ISON-NM optical observations
  75. GRB 100906A: Gemini-N/GMOS redshift
  76. GRB 100906A : Faulkes Telescope North optical observations
  77. GRB 100906A: MASTER early OT observations
  78. GRB 100829A: MASTER optical observations
  79. GRB 100901A: Possible WSRT Radio Detection
  80. GRB100904A: BOOTES-3 Upper Limit
  81. GRB 100905A: MASTER Prompt Optical Observations
  82. GRB 100905A: Faulkes Telescope North observations
  83. Optical observations of GRB 100901A
  84. GRB 100901A: Submm observations from SMA
  85. GRB 100902A: GROND observations; afterglow candidate
  86. GRB10901A: Optical observations at IAO
  87. GRB 100901A: optical observation at Mt.Terskol
  88. GRB 100901A: multicolor photometry at Mt.Terskol
  89. GRB 100901A: Lightbuckets Optical Observations
  90. GRB 100901A: HCT optical observations
  91. GRB 100902A: 1.5m OSN I-band Upper Limits
  92. GRB 100902A: Swift/UVOT Upper Limits
  93. GRB 100901A: optical observation at Mt.Terskol
  94. GRB 100901A: TLS Observations: Break?
  95. GRB 100902A: MASTER Prompt Optical Observations
  96. GRB 100901A: ISON-NM optical observations
  97. GRB 100902A: Faulkes Telescope South observations
  98. GRB 100901A: 1.5m OSN BVRI-band observations.
  99. GRB 100901A: MASTER optical flare at 420s discovery
  100. Swift/UVOT Observations of GRB100901A

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