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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"

21954 results found.

  1. Short GRB 060502B: Tautenburg Observation
  2. GRB 060427B Milagro GeV/TeV Observations
  3. GRB 060502A: TTT Observations
  4. GRB 060501: P60 Observations and Candidate Retraction
  5. GRB 060502B: MASTER optical observations
  6. GRB 060502B: Swift detection of a short burst
  7. GRB060502: Gemini spectroscopy
  8. GRB 060502: APO Spectroscopic Observations
  9. GRB060501: Swift UVOT followup observations
  10. GRB060502: Super-LOTIS Observations
  11. GRB 060502: P60 Afterglow Confirmation
  12. GRB 060501: MDM Observations
  13. GRB060501: Super-LOTIS observations
  14. GRB060428B - SDSS Pre-Burst Observations
  15. GRB060428B: optical observation
  16. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  17. GRB 060428B: MDM Observations
  18. GRB 060428A: PROMPT Observations
  19. GRB 060427B: MASTER optical observations
  20. GRB 060428B: KAIT observations
  21. GRB060425:MASTER optical limit
  22. GRB 051117A: Bright host galaxy not confirmed
  23. GRB060428A: Swift/UVOT observations.
  24. GRB 060428b : Kiso R-band limit
  25. GRB 060428b: Optical afterglow candidate
  26. GRB 060427: NIR observations
  27. GRB060427: Xinglong optical Observations
  28. GRB 060427: NOT observations
  29. GRB060425:MASTER survey observations
  30. GRB060424: optical afterglow detection
  31. GRB 060424: Swift detection of a burst
  32. GRB 060421: TTT Observations
  33. OT 060420: Likely Not a New Cosmic Transient
  34. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  35. GRB060421: Swift/UVOT observations
  36. GRB 060418: prediction of t_break
  37. GRB060418: optical observations
  38. Konus-Wind observation of GRB 060418
  39. GRB(?) 060421: Swift detection of a burst
  40. Erratum of GCN 4983 for GRB 060418 IR follow-up
  41. GRB 060418 : IR afterglow observations
  42. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  43. GRB 060418: Radio Observations
  44. GRB060418: Swift/UVOT Observations
  45. GRB060418: Optical Observations
  46. VLT/UVES observations of GRB060418
  47. GRB 060418, SMARTS continuing afterglow observations
  48. GRB 060418: PROMPT Detections
  49. GRB 060418, SMARTS optical/IR afterglow observations
  50. GRB060418: Magellan/MIKE Spectroscopic Redshift
  51. GRB 060418: REM candidate afterglow
  52. GRB 060413: REM NIR Observations
  53. GRB 060413: Watcher UBVR observations
  54. GRB060403: optical observations
  55. GRB 060403 Optical observations
  56. SGR 1900+14: BAT observations
  57. HETE trigger H4044: RTT150 optical observations
  58. GRB060331: Swift/UVOT upper limits
  59. Swift XRT observations of the HETE transient H4043
  60. H4043, an unusual high-energy transient observed by HETE
  61. GRB 060322: LNA optical limit
  62. INTEGRAL and XMM ToO observations of SGR1900+14
  63. SGR 1900+14: Swift-BAT detection of a bright outburst
  64. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  65. GRB 060323 : WIDGET simultaneous optical observations
  66. GRB 060323: Early optical observation at Xinglong
  67. GRB060218, optical observations
  68. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  69. GRB060323: NOT optical observations
  70. GRB 060322: IAC80 optical observations
  71. GRB 060322: Swift XRT afterglow candidate
  72. GRB060323: P60 Observations
  73. GRB 060323: Swift/UVOT Observations
  74. GRB 060323: optical afterglow confirmed
  75. GRB060323: NOT observations
  76. GRB 060323: Optical Observations
  77. GRB 060323: Tautenburg OT candidate retraction
  78. GRB 060323: optical observations at TNG
  79. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  80. GRB060323 - SDSS Pre-Burst Observations
  81. GRB060219: optical observation
  82. GRB060218/SN2006aj: optical observations
  83. GRB 060319: IAC-80 optical observations
  84. GRB 060319 optical observations at TNG
  85. GRB060319 - SDSS Pre-burst Observations
  86. GRB060313: Radio Observations
  87. GRB 060313: early afterglow NIR upper limits with REM
  88. GRB060313: SSO 40inch Observations
  89. GRB 060313: PROMPT Observations
  90. GRB 060313: Swift/UVOT Observations
  91. GRB060313:Gemini South Observations
  92. GRB060313: optical observations of the afterglow candidate
  93. GRB 060313: Possible optical counterpart
  94. GRB 060313, SMARTS optical/IR observations
  95. GRB060313: optical and near infrared observations with REM
  96. GRB 060313: Swift-BAT detection of a bright short hard burst
  97. GRB060218: SARA Observations of SN2006aj
  98. GRB 060218/SN 2006aj, high resolution spectra
  99. GRB060306: APO Ks-band Imaging Observations
  100. GRB 060306: SOAR Ks Observations

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