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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"

15987 results found.

  1. GRB 070810: Swift/UVOT Optical Counterpart
  2. GRB 070810: ROTSE-III Detection of Optical Counterpart
  3. GRB 070809: Optical Pre-imaging from Palomar
  4. GRB 070809: ROTSE-III Optical Limits
  5. GRB 070809: Swift detection of a short burst
  6. GRB 070808: OPTIMA-Burst optical upper limit
  7. GRB 070808: Xinglong TNT optical Upper Limit
  8. GRB070808: Optical observations with KANATA
  9. GRB 070808: ROTSE-III Optical Limits
  10. GRB070612A: Radio upper limit from GMRT
  11. GRB 070802: REM optical observations
  12. GRB 070802: Swift-XRT refined analysis
  13. GRB 070802: Confirmation of the optical afterglow
  14. GRB 070802: LCO optical observations
  15. GRB 070729: LCO optical imaging
  16. GRB 070721A: optical observations
  17. GRB 070724: optical observations
  18. GRB 070721B: further observations and analysis
  19. GRB 070721B: optical observations and proposed redshift
  20. Swift/UVOT observations of GRB070721B optical afterglow.
  21. GRB 070721B : Faulkes Telescope South observations
  22. GRB 070721A : Faulkes Telescope South optical limit
  23. GRB 070714B: confirmation of optical afterglow
  24. GRB070714B: Swift-XRT refined analysis
  25. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  26. GRB 070714 ("Bastille"): Optical Pre-Imaging
  27. GRB 070714 : Liverpool Telescope optical counterpart ?
  28. GRB 070704: RTT150 optical observations
  29. GRB 070707: optical afterglow
  30. GRB070704: FAVOR optical observations
  31. GRB 070611: VLT observations
  32. VLA detection of GRB 070612A in C Band
  33. GRB 070628: NIR detection of afterglow
  34. GRB 070628: TAROT La Silla observatory optical observations
  35. GRB 070612A: Allen Telescope Array Observations
  36. OT20050728 was not an optical GRB afterglow
  37. GRB 070616 : WIDGET simultaneous optical observations
  38. GRB 070612A: Second Epoch WSRT Radio Observations
  39. GRB070621: RTT150 optical observations
  40. GRB 070621: VLT optical observations
  41. GRB 070621: Gemini South optical imaging
  42. GRB070621: OPTIMA-Burst optical upper limit
  43. GRB 070621: TAROT Calern observatory optical observations
  44. GRB 070621: ROTSE-III Prompt Optical Limits
  45. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  46. GRB 070612A: TNG optical observations
  47. Swift/UVOT detection of GRB070616 optical afterglow.
  48. GRB070616: Optical Observation by MITSuME Akeno
  49. GRB 070612B: Optical Observation by MITSuME Akeno
  50. GRB070616: Optical Observation by MITSuME Okayama
  51. GRB 070616: Swift XRT refined circular
  52. GRB 070612A: Possible WSRT Radio Detection
  53. GRB 070616: BTA astrometry and finding chart
  54. GRB 070616: BTA optical observations
  55. Swift/UVOT observations of GRB070616
  56. GRB 070612B: optical observations
  57. VLA upper limit on GRB 070610
  58. GRB 070612A: Rapid Decay
  59. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  60. GRB070612A: MITSuME Okayama Observation
  61. GRB 070612A: MDM Observations
  62. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  63. GRB 070610: TAROT Calern observatory optical observations
  64. GRB 070610: MITSuME OAO optical upper limit
  65. GRB 070610: SARA upper limit
  66. GRB 070610: Swift-XRT refined analysis
  67. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  68. GRB 070611: Swift-XRT refined analysis
  69. GRB 070610: Optical observations from OSN
  70. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  71. GRB 070611: ROTSE-III Optical Limits
  72. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  73. GRB 070412: TAROT Calern observatory optical observations
  74. GRB 070411: TAROT Calern observatory optical observations
  75. GRB070520B: optical observations
  76. GRB070520: optical observation
  77. GRB070518: optical observation
  78. GRB070521: optical observation
  79. Swift/UVOT refined analysis of GRB070531
  80. GRB 070531: Liverpool Telescope Optical Observations
  81. Swift/UVOT refined analysis of GRB070529
  82. GRB 070529: Optical aterglow from MIRO
  83. GRB 070529: Xinglong TNT Optical Upper Limit
  84. GRB 070529: Swift detection of a burst with an optical aterglow
  85. GRB 070518: MARGE Observations
  86. GRB 070518: optical observation
  87. GRB070521: NIR observations
  88. GRB070520B: NIR observations
  89. GRB 070521, optical observation
  90. GRB070518: Optical/NIR observation
  91. GRB 070521: optical limit by Pi of the Sky
  92. GRB 070521: TAROT La Silla observatory optical observations
  93. GRB 070520A: MITSuME Akeno optical upper limits
  94. GRB 070518: TNG observations
  95. GRB 070520: Xinglong EST optical Upper Limit
  96. GRB 070517: Gemini optical imaging
  97. GRB070518: OSN observation
  98. GRB 070518: Swift detection of a burst with optical afterglow
  99. GRB 070517: Optical search
  100. GRB070419A: optical observations

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