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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"

20516 results found.

  1. GRB 070920A: deep optical observations at the NOT
  2. GRB 071010B: Keck/LRIS Photometry
  3. GRB 071013: TLS Upper Limit
  4. VLA non-detection of GRB 071011
  5. GRB 071013: Optical observations
  6. GRB 071013: optical observations at NOT
  7. GRB071010B, BVRcIc field calibration
  8. GRB 20071013: Xinglong TNT optical Upper Limit
  9. GRB 071010C Swift-BAT detection of a burst
  10. GRB 071011: Optical Limit after 13.95hrs
  11. GRB 071010B correction to GCN 6892 optical observations
  12. GRB 071011: Swift-XRT refined analysis
  13. VLA non-detection of GRB 071010A
  14. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  15. GRB 071011: Confirmation of P60 optical afterglow
  16. GRB 071010B: Optical Detection
  17. GRB 071011: Kanazawa Optical limits
  18. GRB 071011: P60 Optical Afterglow Candidate
  19. GRB 071011: MARGE Optical Limits
  20. GRB 071010B: Super-LOTIS upper limit
  21. GRB 071010B optical photometry
  22. GRB 071011: XRT afterglow detection
  23. GRB 071011: NAYUTA Optical Observation
  24. GRB 071010A: Continued Keck Imaging
  25. GRB 071010B: Bright OT confirmed with TLS
  26. Optical Observation: GRB 071010
  27. Optical observations: GRB 071010A
  28. GRB071010B: Swift/XRT detection
  29. GRB 071010A: Keck/LRIS Photometry
  30. GRB 071010 REM NIR observations
  31. GRB 071010: TAROT La Silla observatory detection of the afterglow
  32. Radio detection of GRB 071003 with the VLA
  33. GRB 070810B: further XRT analysis
  34. Konus-Wind observation of GRB 071003
  35. GRB 071003: Possible rebrightening
  36. GRB 071003 : Lulin R-band observations
  37. GRB 071003: OA power-law decay indices from KAIT
  38. GRB 071003: P60 Confirmation of Optical Afterglow
  39. Faulkes Telescope South observations of GRB 071001
  40. GRB 071001: Swift detection of a burst
  41. VLA observation of GRB 070923
  42. GRB 070911, SMARTS optical/IR afterglow observations
  43. GRB070925: Swift-XRT Afterglow confirmation
  44. GRB 070925: Gemini South Imaging
  45. GRB 070920B: ROTSE-III Early Optical Limits
  46. GRB 070920B: TAROT La Silla observatory optical observations
  47. INTEGRAL ToO observations of SGR1806-20
  48. GRB 070920B: NOT optical observations
  49. GRB 070920: TAROT Calern observatory optical observations
  50. SGR1806-20: Swift-BAT detection of enhanced activity
  51. GRB 070917: P60 Observations
  52. GRB 070917: MITSuME Akeno Ic upper limit
  53. GRB 070917: R band observations
  54. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  55. GRB 070809: The Swift evidence for the SHB nature of this burst
  56. GRB 070913: Swift-BAT refined analysis
  57. GRB 070913: SMARTS optical/IR observations
  58. GRB 070913: TAROT La Silla observatory optical observations
  59. Swift-BAT Notices back to autonomous real-time distribution
  60. GRB 070911: PAIRITEL IR Observations
  61. GRB 070911: Swift detection of a burst
  62. GRB 070809: Confirmation of optical transient
  63. Candidate Orphan GRB Optical Transient in IC 4779
  64. Las Campanas observations of possible TAROT GRB transient near IC
  65. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  66. GRB 070824 - Combined SuperAGILE/IPN Localization
  67. Konus-Wind observation of very bright GRB 070821
  68. GRB 070731: Swift/UVOT Upper Limit
  69. IPN Localization of GRB 070821 (long, very bright)
  70. GRB 070805: UVOT afterglow candidate retraction
  71. GRB 070810A: ROTSE-III Refined Analysis
  72. GRB 070810B : Faulkes Telescope South Observations
  73. GRB 070810A: Continued Keck Imaging
  74. GRB 070810B: Keck spectroscopy of possible host galaxies
  75. GRB070810B: Swift/UVOT Upper Limits
  76. GRB 070810B: XRT refined analysis
  77. GRB 070810B: Xinglong TNT optical Upper Limit
  78. GRB070810B: Optical observations with KANATA
  79. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  80. GRB 070809: Swift/UVOT Upper Limits
  81. VLA upper limit on the short hard burst GRB 070729
  82. No radio detection in superAGILE burst 070724B
  83. GRB 070809: Keck Imaging
  84. GRB 070810: enhanced Swift-XRT position
  85. GRB 070810: Swift/UVOT Optical Counterpart
  86. GRB 070808: Swift/UVOT upper limits
  87. GRB 070809: Swift detection of a short burst
  88. GRB 070808 : Faulkes Telescope South Observations
  89. GCN Swift XRT update position notices and enhanced position circulars
  90. GRB 070808: Swift XRT refined analysis
  91. GRB 070808: Xinglong TNT optical Upper Limit
  92. GRB070808: Optical observations with KANATA
  93. GRB070808 - SDSS Pre-Burst Observations
  94. GRB 070808: ROTSE-III Optical Limits
  95. GRB070805 XRT and UVOT afterglow candidate
  96. GRB070612A: Radio upper limit from GMRT
  97. Swift/UVOT observations of GRB070805
  98. UVOT observations of SAXJ1810.8-2609
  99. Swift detection of a outburst from SAX J1810.8-2609
  100. VLA non-detection of GRB 070721B

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