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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"

20546 results found.

  1. GRB 070621: NOT observations
  2. GRB070621: OPTIMA-Burst optical upper limit
  3. GRB 070621: TAROT Calern observatory optical observations
  4. GRB 070621: Watcher Observations
  5. GRB 070621: Swift detection of a burst
  6. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  7. Swift/UVOT detection of GRB070616 optical afterglow.
  8. GRB070616: Optical Observation by MITSuME Okayama
  9. GRB 070616: TLS observation
  10. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  11. GRB 070616: Swift detection of a burst
  12. GRB 070612B: optical observations
  13. UVOT Observations of INTEGRAL burst GRB070615
  14. VLA upper limit on GRB 070610
  15. GRB 070615
  16. SWIFT J195509.6+261406 (GRB 070610): further observations
  17. GRB 070612A: Super-LOTIS observations
  18. GRB 070612A: Rapid Decay
  19. GRB 070612A: Suzaku/WAM observation of the prompt emission
  20. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  21. GRB070612A: MITSuME Okayama Observation
  22. GRB 070612A: continued SARA observations
  23. GRB 070611: Watcher Observations
  24. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  25. GRB 070612B: SARA upper limit
  26. GRB 070612B: Swift-XRT refined analysis
  27. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  28. GRB 070612B: Swift/UVOT upper limits
  29. GRB 070612B: FRAM limit
  30. GRB070612B: P60 Observations
  31. GRB 070612A: SARA detection of possible OT
  32. GRB 070610: TAROT Calern observatory optical observations
  33. GRB 070610: MITSuME OAO optical upper limit
  34. GRB070612 - SDSS Pre-Burst Observations
  35. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  36. GRB 070610: SARA upper limit
  37. GRB 070610: Swift-XRT refined analysis
  38. GRB 070611: Swift/UVOT Observations
  39. GRB 070610: Optical observations from OSN
  40. GRB 070610: Watcher Observations
  41. GRB 070611: ROTSE-III Optical Limits
  42. GRB 070610: Swift-UVOT Upper Limits
  43. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  44. GRB 070412: TAROT Calern observatory optical observations
  45. GRB 070411: TAROT Calern observatory optical observations
  46. GRB 070419A, deep LBT photometry and possible supernova detection
  47. GRB 070531: NOT nIR observations
  48. GRB 070531: I-band observations from IAC80
  49. GRB 070531: Liverpool Telescope Optical Observations
  50. GRB 070529: SARA upper limit
  51. Swift/UVOT refined analysis of GRB070529
  52. GRB 070529: Optical aterglow from MIRO
  53. GRB 070529, Swift-BAT refined analysis
  54. GRB 070529: Xinglong TNT Optical Upper Limit
  55. GRB 070529: Swift detection of a burst with an optical aterglow
  56. GRB 070412: Deep Keck imaging
  57. Swift trigger 280447 is probably a Galactic transient
  58. GRB070521: Second Epoch Gemini Imaging
  59. GRB 070521: Swift/UVOT Upper Limits
  60. GRB 070521, optical observation
  61. GRB 070521: Swift-XRT refined analysis
  62. GRB 070521: Keck imaging
  63. GRB070521: Gemini Observations
  64. GROND upper limits of GRB 070521
  65. GRB 070520B: SARA upper limit
  66. GRB 070520A: SARA upper limit
  67. GRB 070521: SARA upper limit
  68. GRB 070521: Subaru observations and possible host detection
  69. GRB 070520B: Swift/UVOT Upper Limits
  70. GRB 070520A: Subaru Observations
  71. GRB 070520A: Swift UVOT Upper Limits
  72. GRB 070521: TAROT La Silla observatory optical observations
  73. GRB070521 - SDSS Pre-Burst Observations
  74. GRB 070521: Swift detection of a burst
  75. GRB 070520A: MITSuME Akeno optical upper limits
  76. GRB 070520B, Swift-BAT refined analysis
  77. GRB 070520A: Swift-XRT refined analysis
  78. GRB 070518: TNG observations
  79. GRB 070520B: Swift detection of a burst
  80. GRB 070520: Xinglong EST optical Upper Limit
  81. GRB 070520: Swift detection of a burst
  82. VLA observation of GRB 070518
  83. GRB 070518: Swift-XRT refined analysis
  84. GRB070518: UVOT refined analysis
  85. GRB 070518: OT confirmed form Xinglong TNT observation
  86. GRB 070518: Swift detection of a burst with optical afterglow
  87. GRB 070517: Swift detection of a burst
  88. GRB 070509: objects inside XRT error circle
  89. GRB 070512: IPN localization and Konus spectrum of a bright burst
  90. GRB 070419A, Deep LBT photometry
  91. GRB 070508: pseudo-z from 4 different spectral analyses
  92. GRB 070509: Swift/UVOT Upper Limits
  93. GRB070509: Swift-XRT Refined Analysis
  94. GRB 070508: Suzaku/WAM observation of the prompt emission
  95. GRB 070509: REM observations
  96. GRB 070508: REM observations
  97. GRB 070508: TAROT La Silla observatory optical observations
  98. GRB 070508: Swift detection of an intense burst with an optical counterpart
  99. GRB070412: MAGIC telescope GeV observation
  100. GRB070506: Swift/UVOT Observations

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