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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"

19293 results found.

  1. GRB 070219, Swift-BAT refined analysis
  2. GRB 070219: Swift detection of a burst
  3. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  4. GRB 070125: Break in Optical Decay
  5. GRB 070209: Swift XRT analysis
  6. GRB 070201: clarification on localization and Konus-Wind spectra
  7. IPN localization of very bright long hard GRB 070207
  8. GRB 070209, Swift-BAT refined analysis of the short hard burst
  9. GRB 070208: Swift XRT refined analysis
  10. GRB 070208, Swift-BAT refined analysis
  11. GRB070208 - SDSS Pre-Burst Observations
  12. GRB 070208: Early IR detection and afterglow astrometry
  13. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  14. GRB 070125: optical observation
  15. GRB 070129, Swift-BAT refined analysis of a particularly long
  16. GRB 070129: Swift-XRT Refined Analysis
  17. GRB 070125: MITSuME Okayama optical observation
  18. GRB 070126: VLT observations
  19. GRB 070124: Suzaku WAM observation of the prompt emissions
  20. GRB 070125: UVOT Detection in Ultraviolet Filters
  21. GRB 070126, Swift-BAT refined analysis of a very faint burst
  22. GRB070124: Swift-XRT Observation
  23. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  24. GRB 070125: Lick 3m Spectroscopy
  25. GRB070125: Swift-XRT Refined Analysis
  26. IPN localization of GRB070124 (short duration, hard spectrum)
  27. GRB 070110: Continued Detection and Request for Ground Followup
  28. GRB 070110: Ep,i - Eiso correlation
  29. GRB 070107: Suzaku WAM observation of the prompt emission
  30. GRB 070110: UVOT Observations of a Candidate Afterglow
  31. GRB070110: Swift XRT Team refined analysis
  32. GRB 070110, Swift-BAT refined analysis
  33. GRB 070110: Swift detection of a burst with a possible optical afterglow
  34. GRB 070107: Possible UVOT Afterglow
  35. GRB 070107, Swift-BAT refined analysis
  36. GRB070103: KPNO 4m+FLAMINGOS J limit
  37. GRB070103: Swift XRT refined analysis
  38. GRB 070103, Swift-BAT refined analysis
  39. Retractions of previous Swift-BAT triggers
  40. GRB 050826: MDM Redshift
  41. GRB 061222B, Swift-BAT refined analysis
  42. GRB 061222A: Observation with the KANATA 1.5m telescope
  43. GRB 061217: Magellan host galaxy redshift
  44. GRB 061222A, Swift-BAT refined analysis
  45. GRB 061222b: optical afterglow
  46. GRB 061218, Swift-BAT refined analysis
  47. Swift triggers (#251863) on a possible burst
  48. GRB 061217: optical observations at Calar Alto
  49. GRB061217 - Swift/XRT refined analysis
  50. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  51. GRB 061217, Swift-BAT refined analysis
  52. GRB061210: Swift/UVOT observations
  53. GRB 061202: Suzaku WAM observation of the prompt emission
  54. GRB 061210, Swift-BAT refined analysis of the SHB
  55. GRB 060926: MASTER: discovery of the optical flare
  56. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  57. GRB 061202: TORTOREM optical upper limits
  58. GRB061202 optical limit by "Pi of the Sky"
  59. GRB 061202, Swift-BAT refined analysis
  60. GRB 061201: Initial UVOT Observations
  61. GRB 061201, Swift-BAT refined analysis of the SHB
  62. GRB 061201: Swift detection of a short hard burst
  63. GRB 061121: Second Epoch ATCA Radio Observations
  64. Swift XRT on-board boresight update
  65. GRB 061126: optical observation
  66. GRB 061126: Tautenburg afterglow observations
  67. GRB 061126: Swift-XRT refined analysis
  68. GRB 061126, Swift-BAT refined analysis
  69. GRB 061126: Swift/UVOT Afterglow Detection
  70. GRB 061122: Confirmation of X-ray/Optical Afterglow
  71. GRB 061122: Candidate Optical Afterglow
  72. GRB 061121: Ep,i - Eiso correlation
  73. GRB061122: Swift/UVOT Optical Observations
  74. Konus-Wind observation of GRB 061122
  75. INTEGRAL results on GRB 061122
  76. GRB 061121: Swift-XRT Team Refined Analysis
  77. GRB 061121, Swift-BAT refined analysis
  78. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  79. GRB 061121: Swift detection of a bright burst with an optical counterpart
  80. GRB 050915B: optical afterglow
  81. Swift-BAT triggers 238544 and 238546 are not GRBs
  82. GRB 061110B, Swift-BAT refined analysis
  83. GRB 061110A: Swift XRT refined analysis
  84. GRB 061110A, Swift-BAT refined analysis
  85. GRB 061110 : Optical afterglow candidate
  86. GRB 061109: optical observation
  87. GRB 061027: TAROT La Silla observatory optical observations
  88. GRB 061028: Swift/XRT Astrometry Correction
  89. GRB 061102, XRT refined analysis
  90. GRB 061102, Swift-BAT refined analysis
  91. GRB 060801: Swift/XRT Astrometry Correction
  92. GRB061028: XRT refined analysis
  93. GRB 061028, Swift-BAT refined analysis
  94. GRB 061027, Swift refined analysis of a possible burst
  95. GRB061025: Swift XRT refined analysis
  96. GRB 061025: a long GRB detected by INTEGRAL
  97. Swift XRT boresight update
  98. GRB 061021, Swift-BAT refined analysis
  99. GRB 061021: Swift detection of a burst
  100. GRB061019: optical observations

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