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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"

25826 results found.

  1. GRB070223: Swift burst
  2. Konus-Wind and Konus-A observations of GRB 070220
  3. GRB 070220 Swift-BAT Refined Analysis
  4. Swift/UVOT refined analysis of GRB070220
  5. GRB 070209: Swift XRT refined analysis
  6. GRB 070220: Swift-XRT Refined Analysis
  7. GRB 070220 : Faulkes Telescope North optical limit
  8. GRB 070220: Swift detection of a burst
  9. GRB070219: MASTER-VWF-Kislovodsk observations
  10. GRB 070219: XRT Refined Analysis
  11. GRB 070219: Swift/UVOT Upper limits
  12. GRB 070219, Swift-BAT refined analysis
  13. GRB 070219: Liverpool Telescope Observations
  14. GRB 070219: ROTSE-III Optical Limits
  15. GRB070219 - SDSS Pre-Burst Observations
  16. GRB 070219: Swift detection of a burst
  17. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  18. Swift-BAT trigger 260304 is NOT a burst or transient
  19. GRB 070209: Swift XRT analysis
  20. IPN localization of very bright long hard GRB 070207
  21. IPN localization of very intense short GRB 070201
  22. GRB 070209, Swift-BAT refined analysis of the short hard burst
  23. GRB 070209: Swift detection of a short hard burst
  24. GRB 070208: Swift XRT refined analysis
  25. GRB 070208: RAPTOR detection of early afterglow onset
  26. GRB 070208, Swift-BAT refined analysis
  27. GRB 070208: Early IR detection and afterglow astrometry
  28. GRB070208: Faulkes Telescope North Afterglow Identification
  29. GRB 070208: ROTSE-III Optical Limits
  30. GRB 070208: MDM Observations
  31. GRB 070208: Swift detection of a burst
  32. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  33. GRB070126: Swift-XRT Observation
  34. GRB 070129: Swift/UVOT Upper limits
  35. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  36. GRB070129: MITSuME optical observation
  37. GRB061217: MAGIC telescope GeV observation
  38. GRB 070129, Swift-BAT refined analysis of a particularly long
  39. GRB 070129: Swift-XRT Refined Analysis
  40. GRB 070129: Swift detection of a burst
  41. GRB 070126: Swift/UVOT refined analysis
  42. GRB 070126: VLT observations
  43. GRB070126: Swift-XRT possible detection of an afterglow
  44. GRB 070125: UVOT Detection in Ultraviolet Filters
  45. GRB 070126, Swift-BAT refined analysis of a very faint burst
  46. GRB070124: Swift-XRT Observation
  47. Possible GRB 070126: Swift/UVOT Upper Limit
  48. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  49. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  50. GRB070125: Swift-XRT Refined Analysis
  51. GRB 070126?: Swift detection of a possible burst
  52. IPN-BAT localization of GRB070125 (very long duration, intense)
  53. Konus-Wind observation of short hard GRB 070124
  54. Swift-BAT trigger 257213 is a Galactic Center transient
  55. GRB 070110: Continued Detection and Request for Ground Followup
  56. GRB 070110: Ep,i - Eiso correlation
  57. Further Retractions of previous Swift-BAT triggers
  58. Swift-BAT Trigger 255685 is not a GRB
  59. Trigger 255685: Swift detection of a possible burst
  60. GRB 070110: UVOT Observations of a Candidate Afterglow
  61. GRB070110: Swift XRT Team refined analysis
  62. GRB 070110, Swift-BAT refined analysis
  63. GRB 070110: Swift detection of a burst with a possible optical afterglow
  64. IBAS Alert n. 4047: Not a GRB
  65. GRB070107: Swift/XRT refined analysis
  66. GRB 070107: Possible UVOT Afterglow
  67. GRB 070107, Swift-BAT refined analysis
  68. GRB 070107: Swift/XRT position
  69. GRB 070107: Swift detection of a burst
  70. GRB070103: APO SPIcam i' and z' limits
  71. GRB 070103: Swift/UVOT Upper limits
  72. GRB070103: Swift XRT refined analysis
  73. GRB 070103, Swift-BAT refined analysis
  74. GRB 070103: TAROT Calern observatory optical observations
  75. GRB 070103: Swift detection of a burst
  76. Retractions of previous Swift-BAT triggers
  77. Konus-Wind observation of GRB 061222A
  78. GRB 050826: MDM Redshift
  79. GRB 061222B: TAROT La Silla observatory early optical observations
  80. GRB 061218: TAROT La Silla observatory early optical observations
  81. GRB 061222A: MITSuME Akeno optical upper limits
  82. GRB 061222B: MITSuME Akeno optical upper limits
  83. GRB 061222B, Swift-BAT refined analysis
  84. GRB061222A Swift/UVOT: Upper Limits
  85. GRB 061222B: Swift/UVOT Upper limits
  86. GRB061222B: Swift-XRT Refined Analysis
  87. GRB 061222B: BOOTES-IR optical observations
  88. GRB 061222B: SARA upper limit
  89. GRB 061222A: Swift-XRT refined analysis
  90. GRB 061222A, Swift-BAT refined analysis
  91. GRB 061222B: TAROT La Silla observatory afterglow observation
  92. GRB 061222B: TAROT La Silla observatory optical observations
  93. GRB 061222B: Swift detection of a burst
  94. GRB 061222A: Prompt ROTSE-III Optical Limits
  95. GRB 061222: Swift detection of a burst
  96. GRB 061218: TAROT La Silla observatory optical observations
  97. GRB 061217: TAROT Calern observatory optical observations
  98. GRB 061218: TORTOREM optical upper limits
  99. GRB 061218, Swift-BAT refined analysis
  100. GRB 061218: REM prompt observations

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