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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"

15717 results found.

  1. GRB 070704: RTT150 optical observations
  2. GRB 070707: optical afterglow
  3. GRB070704: FAVOR optical observations
  4. GRB 070611: VLT observations
  5. VLA detection of GRB 070612A in C Band
  6. GRB 070628: NIR detection of afterglow
  7. GRB 070628: TAROT La Silla observatory optical observations
  8. GRB 070612A: Allen Telescope Array Observations
  9. OT20050728 was not an optical GRB afterglow
  10. INTEGRAL burst GRB070615: X-ray continued observations
  11. GRB 070616 : WIDGET simultaneous optical observations
  12. GRB 070612A: Second Epoch WSRT Radio Observations
  13. GRB070621: RTT150 optical observations
  14. GRB 070621: VLT optical observations
  15. GRB 070621: Gemini South optical imaging
  16. GRB070621: OPTIMA-Burst optical upper limit
  17. GRB 070621: TAROT Calern observatory optical observations
  18. GRB 070621: ROTSE-III Prompt Optical Limits
  19. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  20. GRB 070612A: TNG optical observations
  21. Swift/UVOT detection of GRB070616 optical afterglow.
  22. GRB070616: Optical Observation by MITSuME Akeno
  23. GRB 070612B: Optical Observation by MITSuME Akeno
  24. GRB070616: Optical Observation by MITSuME Okayama
  25. GRB 070616: Swift XRT refined circular
  26. GRB 070612A: Possible WSRT Radio Detection
  27. GRB 070616: BTA astrometry and finding chart
  28. GRB 070616: BTA optical observations
  29. Swift/UVOT observations of GRB070616
  30. GRB 070612B: optical observations
  31. VLA upper limit on GRB 070610
  32. GRB 070612A: Rapid Decay
  33. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  34. GRB070612A: MITSuME Okayama Observation
  35. GRB 070612A: continued SARA observations
  36. GRB 070612A: MDM Observations
  37. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  38. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  39. GRB 070610: TAROT Calern observatory optical observations
  40. GRB 070610: MITSuME OAO optical upper limit
  41. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  42. GRB 070610: SARA upper limit
  43. GRB 070610: Swift-XRT refined analysis
  44. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  45. GRB 070611: Swift-XRT refined analysis
  46. GRB 070610: Optical observations from OSN
  47. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  48. GRB 070611: ROTSE-III Optical Limits
  49. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  50. GRB 070412: TAROT Calern observatory optical observations
  51. GRB 070411: TAROT Calern observatory optical observations
  52. GRB 070419A, deep LBT photometry and possible supernova detection
  53. GRB070520B: optical observations
  54. GRB070520: optical observation
  55. GRB070518: optical observation
  56. GRB070521: optical observation
  57. Swift/UVOT refined analysis of GRB070531
  58. GRB 070531: Liverpool Telescope Optical Observations
  59. Swift/UVOT refined analysis of GRB070529
  60. GRB 070529: Optical aterglow from MIRO
  61. GRB 070529: Xinglong TNT Optical Upper Limit
  62. GRB 070529: Swift detection of a burst with an optical aterglow
  63. GRB 070518: MARGE Observations
  64. GRB 070518: optical observation
  65. GRB070521: NIR observations
  66. GRB070520B: NIR observations
  67. GRB 070521, optical observation
  68. GROND upper limits of GRB 070521
  69. GRB070518: Optical/NIR observation
  70. GRB 070521: optical limit by Pi of the Sky
  71. GRB 070521: TAROT La Silla observatory optical observations
  72. GRB 070520A: MITSuME Akeno optical upper limits
  73. GRB 070518: TNG observations
  74. GRB 070520: Xinglong EST optical Upper Limit
  75. GRB 070517: Gemini optical imaging
  76. GRB070518: OSN observation
  77. GRB 070518: Swift detection of a burst with optical afterglow
  78. GRB 070517: Optical search
  79. GRB070419A: optical observations
  80. GRB 070508: OA fading and tentative redshift
  81. GRB 070509: REM observations
  82. GRB 070509: ROTSE-III Optical Limits
  83. GRB 070508, SMARTS optical afterglow observation
  84. GRB 070508: Multicolor optical observations and possible redshift limit
  85. GRB 070508: Swift-XRT refined analysis
  86. GRB 070508: Optical observation limiting magnitude
  87. GRB 070508: Optical afterglow detection
  88. GRB 070508: REM observations
  89. GRB 070508: TAROT La Silla observatory optical observations
  90. GRB 070508: Swift detection of an intense burst with an optical counterpart
  91. GRB070506: Swift XRT refined analysis
  92. GRB 070506: Swift detection of a burst with optical afterglow
  93. GRB 070412, deep LBT imaging
  94. GRB 070429A: Swift XRT further analysis
  95. GRB 070429A: optical observations
  96. GRB 070429A: Swift XRT refined analysis
  97. GRB 070429A: optical and NIR observations
  98. GRB 070429B: ROTSE-III Optical Limits
  99. GRB 070429: ROTSE-III Optical Limits
  100. GRB 070420, SMARTS optical/IR afterglow observations

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