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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"

20511 results found.

  1. GRB 071013: optical observations at NOT
  2. GRB071010B, BVRcIc field calibration
  3. GRB 20071013: Xinglong TNT optical Upper Limit
  4. GRB 071010C Swift-BAT detection of a burst
  5. GRB 071011: Optical Limit after 13.95hrs
  6. GRB 071010B correction to GCN 6892 optical observations
  7. GRB 071011: Swift-XRT refined analysis
  8. VLA non-detection of GRB 071010A
  9. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  10. GRB 071011: Confirmation of P60 optical afterglow
  11. GRB 071010B: Optical Detection
  12. GRB 071011: Kanazawa Optical limits
  13. GRB 071011: P60 Optical Afterglow Candidate
  14. GRB 071011: MARGE Optical Limits
  15. GRB 071010B: Super-LOTIS upper limit
  16. GRB 071010B optical photometry
  17. GRB 071011: XRT afterglow detection
  18. GRB 071011: NAYUTA Optical Observation
  19. GRB 071010A: Continued Keck Imaging
  20. GRB 071010B: Bright OT confirmed with TLS
  21. Optical Observation: GRB 071010
  22. Optical observations: GRB 071010A
  23. GRB071010B: Swift/XRT detection
  24. GRB 071010A: Keck/LRIS Photometry
  25. GRB 071010 REM NIR observations
  26. GRB 071010: TAROT La Silla observatory detection of the afterglow
  27. Radio detection of GRB 071003 with the VLA
  28. GRB 070810B: further XRT analysis
  29. Konus-Wind observation of GRB 071003
  30. GRB 071003: Possible rebrightening
  31. GRB 071003 : Lulin R-band observations
  32. GRB 071003: OA power-law decay indices from KAIT
  33. GRB 071003: P60 Confirmation of Optical Afterglow
  34. Faulkes Telescope South observations of GRB 071001
  35. GRB 071001: Swift detection of a burst
  36. VLA observation of GRB 070923
  37. GRB 070911, SMARTS optical/IR afterglow observations
  38. GRB070925: Swift-XRT Afterglow confirmation
  39. GRB 070925: Gemini South Imaging
  40. GRB 070920B: ROTSE-III Early Optical Limits
  41. GRB 070920B: TAROT La Silla observatory optical observations
  42. INTEGRAL ToO observations of SGR1806-20
  43. GRB 070920B: NOT optical observations
  44. GRB 070920: TAROT Calern observatory optical observations
  45. SGR1806-20: Swift-BAT detection of enhanced activity
  46. GRB 070917: P60 Observations
  47. GRB 070917: MITSuME Akeno Ic upper limit
  48. GRB 070917: R band observations
  49. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  50. GRB 070809: The Swift evidence for the SHB nature of this burst
  51. GRB 070913: Swift-BAT refined analysis
  52. GRB 070913: SMARTS optical/IR observations
  53. GRB 070913: TAROT La Silla observatory optical observations
  54. Swift-BAT Notices back to autonomous real-time distribution
  55. GRB 070911: PAIRITEL IR Observations
  56. GRB 070911: Swift detection of a burst
  57. GRB 070809: Confirmation of optical transient
  58. Candidate Orphan GRB Optical Transient in IC 4779
  59. Las Campanas observations of possible TAROT GRB transient near IC
  60. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  61. GRB 070824 - Combined SuperAGILE/IPN Localization
  62. Konus-Wind observation of very bright GRB 070821
  63. GRB 070731: Swift/UVOT Upper Limit
  64. IPN Localization of GRB 070821 (long, very bright)
  65. GRB 070805: UVOT afterglow candidate retraction
  66. GRB 070810A: ROTSE-III Refined Analysis
  67. GRB 070810B : Faulkes Telescope South Observations
  68. GRB 070810A: Continued Keck Imaging
  69. GRB 070810B: Keck spectroscopy of possible host galaxies
  70. GRB070810B: Swift/UVOT Upper Limits
  71. GRB 070810B: XRT refined analysis
  72. GRB 070810B: Xinglong TNT optical Upper Limit
  73. GRB070810B: Optical observations with KANATA
  74. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  75. GRB 070809: Swift/UVOT Upper Limits
  76. VLA upper limit on the short hard burst GRB 070729
  77. No radio detection in superAGILE burst 070724B
  78. GRB 070809: Keck Imaging
  79. GRB 070810: enhanced Swift-XRT position
  80. GRB 070810: Swift/UVOT Optical Counterpart
  81. GRB 070808: Swift/UVOT upper limits
  82. GRB 070809: Swift detection of a short burst
  83. GRB 070808 : Faulkes Telescope South Observations
  84. GCN Swift XRT update position notices and enhanced position circulars
  85. GRB 070808: Swift XRT refined analysis
  86. GRB 070808: Xinglong TNT optical Upper Limit
  87. GRB070808: Optical observations with KANATA
  88. GRB070808 - SDSS Pre-Burst Observations
  89. GRB 070808: ROTSE-III Optical Limits
  90. GRB070805 XRT and UVOT afterglow candidate
  91. GRB070612A: Radio upper limit from GMRT
  92. Swift/UVOT observations of GRB070805
  93. UVOT observations of SAXJ1810.8-2609
  94. Swift detection of a outburst from SAX J1810.8-2609
  95. VLA non-detection of GRB 070721B
  96. GRB 070802: REM optical observations
  97. GRB 070802: Swift-XRT refined analysis
  98. GRB070802: Swift/UVOT upper limits
  99. GRB 070802: V-band detection of the candidate afterglow
  100. GRB 070802: GROND J band candidate

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