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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"

27400 results found.

  1. GRB 070704: Correction to GCN Circ 6594
  2. GRB 070704: Swift detection of a burst
  3. GRB 070626: Suzaku/WAM observation of the prompt emission
  4. GRB 070628 Swift-UVOT Refined Analysis
  5. GRB 070628: NIR detection of afterglow
  6. GRB 070628, Swift-BAT refined analysis
  7. GRB 070628: TAROT La Silla observatory optical observations
  8. Swift UVOT Observations of GRB 070628
  9. OT20050728 was not an optical GRB afterglow
  10. GRB 070616 : WIDGET simultaneous optical observations
  11. GRB 070616: Suzaku/WAM observation of the prompt emission
  12. GRB070621: RTT150 optical observations
  13. GRB 070621: VLT optical observations
  14. GRB 070621: Swift/UVOT Upper Limits
  15. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  16. GRB 070621: Swift-BAT refined analysis
  17. GRB070621: Swift XRT refined analysis
  18. GRB 070621: Gemini South optical imaging
  19. GRB 070621: UVOT-enhanced XRT position
  20. Observations of GRB070612A at Calar Alto
  21. GRB 070621: NOT observations
  22. GRB070621: OPTIMA-Burst optical upper limit
  23. GRB 070621: TAROT Calern observatory optical observations
  24. GRB 070621: Watcher Observations
  25. GRB 070621: Swift detection of a burst
  26. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  27. Swift/UVOT detection of GRB070616 optical afterglow.
  28. GRB 070612A: NOT observations
  29. GRB070616: Optical Observation by MITSuME Okayama
  30. GRB 070616, Swift-BAT further refined analysis
  31. GRB 070616: BTA optical observations
  32. GRB 070616: TLS observation
  33. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  34. GRB 070616: Swift detection of a burst
  35. GRB 070612B: optical observations
  36. UVOT Observations of INTEGRAL burst GRB070615
  37. VLA upper limit on GRB 070610
  38. GRB 070615
  39. SWIFT J195509.6+261406 (GRB 070610): further observations
  40. GRB 070612A: Super-LOTIS observations
  41. GRB 070612A: Rapid Decay
  42. GRB 070612A: Suzaku/WAM observation of the prompt emission
  43. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  44. GRB070612A: MITSuME Okayama Observation
  45. GRB 070612A: continued SARA observations
  46. GRB 070611: Watcher Observations
  47. Swift Trigger 282176 is Cygnus X-1
  48. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  49. GRB 070612B: SARA upper limit
  50. GRB 070612B, Swift-BAT refined analysis
  51. GRB 070612A, Swift-BAT refined analysis
  52. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  53. GRB 070612B: Swift/UVOT upper limits
  54. GRB 070612B: FRAM limit
  55. GRB070612B: P60 Observations
  56. GRB 070612A: SARA detection of possible OT
  57. GRB 070610: TAROT Calern observatory optical observations
  58. GRB 070610: MITSuME OAO optical upper limit
  59. GRB070612 - SDSS Pre-Burst Observations
  60. GRB 070612: Swift detection of a burst
  61. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  62. GRB 070610: SARA upper limit
  63. GRB 070610: Swift-XRT refined analysis
  64. GRB 070611: Swift/UVOT Observations
  65. GRB 070611: Swift-XRT refined analysis
  66. GRB 070611, Swift-BAT refined analysis
  67. GRB 070610: Optical observations from OSN
  68. GRB 070610: Watcher Observations
  69. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  70. GRB 070611: ROTSE-III Optical Limits
  71. GRB 070610: Swift-UVOT Upper Limits
  72. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  73. GRB 070610, Swift-BAT refined analysis
  74. GRB 070412: TAROT Calern observatory optical observations
  75. GRB 070411: TAROT Calern observatory optical observations
  76. GRB070520B: optical observations
  77. GRB070520: optical observation
  78. GRB070518: optical observation
  79. GRB070521: optical observation
  80. GRB 070531: NOT nIR observations
  81. GRB 070531: Swift-BAT refined analysis
  82. GRB 070531: I-band observations from IAC80
  83. GRB 070531: Liverpool Telescope Optical Observations
  84. GRB 070529: SARA upper limit
  85. Swift/UVOT refined analysis of GRB070529
  86. GRB 070529: Optical aterglow from MIRO
  87. GRB 070529: Swift-XRT refined analysis
  88. GRB 070529, Swift-BAT refined analysis
  89. GRB 070529: Xinglong TNT Optical Upper Limit
  90. GRB 070529: Swift detection of a burst with an optical aterglow
  91. GRB 070412: Deep Keck imaging
  92. Swift trigger 280447 is probably a Galactic transient
  93. GRB 070518, deep LBT photometry
  94. Konus-Wind observation of GRB 070521
  95. GRB070521: Second Epoch Gemini Imaging
  96. GRB 070521: Swift/UVOT Upper Limits
  97. GRB 070521, optical observation
  98. GRB 070521: Swift-XRT refined analysis
  99. GRB 070521: Keck imaging
  100. GRB070521: Gemini Observations

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