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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20408 results found.

  1. GRB 070610: Optical observations from OSN
  2. GRB 070610: Watcher Observations
  3. GRB 070611: ROTSE-III Optical Limits
  4. GRB 070610: Swift-UVOT Upper Limits
  5. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  6. GRB 070412: TAROT Calern observatory optical observations
  7. GRB 070411: TAROT Calern observatory optical observations
  8. GRB 070419A, deep LBT photometry and possible supernova detection
  9. GRB 070531: NOT nIR observations
  10. GRB 070531: I-band observations from IAC80
  11. GRB 070531: Liverpool Telescope Optical Observations
  12. GRB 070529: SARA upper limit
  13. Swift/UVOT refined analysis of GRB070529
  14. GRB 070529: Optical aterglow from MIRO
  15. GRB 070529, Swift-BAT refined analysis
  16. GRB 070529: Xinglong TNT Optical Upper Limit
  17. GRB 070529: Swift detection of a burst with an optical aterglow
  18. GRB 070412: Deep Keck imaging
  19. Swift trigger 280447 is probably a Galactic transient
  20. GRB070521: Second Epoch Gemini Imaging
  21. GRB 070521: Swift/UVOT Upper Limits
  22. GRB 070521, optical observation
  23. GRB 070521: Swift-XRT refined analysis
  24. GRB 070521: Keck imaging
  25. GRB070521: Gemini Observations
  26. GROND upper limits of GRB 070521
  27. GRB 070520B: SARA upper limit
  28. GRB 070520A: SARA upper limit
  29. GRB 070521: SARA upper limit
  30. GRB 070521: Subaru observations and possible host detection
  31. GRB 070520B: Swift/UVOT Upper Limits
  32. GRB 070520A: Subaru Observations
  33. GRB 070520A: Swift UVOT Upper Limits
  34. GRB 070521: TAROT La Silla observatory optical observations
  35. GRB070521 - SDSS Pre-Burst Observations
  36. GRB 070521: Swift detection of a burst
  37. GRB 070520A: MITSuME Akeno optical upper limits
  38. GRB 070520B, Swift-BAT refined analysis
  39. GRB 070520A: Swift-XRT refined analysis
  40. GRB 070518: TNG observations
  41. GRB 070520B: Swift detection of a burst
  42. GRB 070520: Xinglong EST optical Upper Limit
  43. GRB 070520: Swift detection of a burst
  44. VLA observation of GRB 070518
  45. GRB 070518: Swift-XRT refined analysis
  46. GRB070518: UVOT refined analysis
  47. GRB 070518: OT confirmed form Xinglong TNT observation
  48. GRB 070518: Swift detection of a burst with optical afterglow
  49. GRB 070517: Swift detection of a burst
  50. GRB 070509: objects inside XRT error circle
  51. GRB 070512: IPN localization and Konus spectrum of a bright burst
  52. GRB 070419A, Deep LBT photometry
  53. GRB 070508: pseudo-z from 4 different spectral analyses
  54. GRB 070509: Swift/UVOT Upper Limits
  55. GRB070509: Swift-XRT Refined Analysis
  56. GRB 070508: Suzaku/WAM observation of the prompt emission
  57. GRB 070509: REM observations
  58. GRB 070508: REM observations
  59. GRB 070508: TAROT La Silla observatory optical observations
  60. GRB 070508: Swift detection of an intense burst with an optical counterpart
  61. GRB070412: MAGIC telescope GeV observation
  62. GRB070506: Swift/UVOT Observations
  63. GRB 070506: Swift detection of a burst with optical afterglow
  64. GRB070429B: VLT observations
  65. GRB070429B: position correction
  66. GRB 070309: Swift-XRT afterglow confirmation
  67. GRB070429B: possible host galaxy detection
  68. VLA observation of GRB 070429B
  69. Swift/UVOT observations of GRB070429B
  70. GRB 070429B, Swift-BAT refined analysis
  71. Swift/UVOT observations of GRB070429A
  72. GRB 070429A: optical and NIR observations
  73. GRB 070429B: Swift XRT refined analysis
  74. GRB 070429B: ROTSE-III Optical Limits
  75. GRB 070429: ROTSE-III Optical Limits
  76. GRB 070429: Swift detection of a burst
  77. LT monitoring of GRB070412
  78. GRB 070411: Late-time Keck imaging
  79. GRB 070411, deep LBT photometry
  80. GRB 070420 Swift-BAT Refined Analysis
  81. GRB 070420: optical rebrightening observed at Mt. John
  82. GRB070420: Swift UVOT continuing observations
  83. GRB 070420: Faulkes Telescope South Observations
  84. GBR 070419A: Swift/XRT refined analysis
  85. GRB 070420: TAROT La Silla observatory optical observations
  86. GRB 070420: NIR and optical afterglow confirmed
  87. GRB 070420: Swift detection of a burst with optical afterglow
  88. GRB 070419A: MITSuME Okayama Observations
  89. GRB 070419B, Swift-BAT refined analysis
  90. GRB 070419A, Optical observations
  91. GRB070419 - SDSS Pre-Burst Observations
  92. GRB 070419A: SARA observations
  93. GRB 070419A: NAYUTA Optical Observation
  94. GRB 070419A: Optical and IR observations with KANATA
  95. GRB070419A, optical observation
  96. Infrared detection of GRB070419A with UKIRT
  97. GRB 070419A: Kiso Optical observation
  98. GRB 070419: P60 Confirmation of Optical Afterglow
  99. GRB 070419B: Swift detection of a burst
  100. GRB 070419A: ROTSE-III Optical Limits

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