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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"

21953 results found.

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

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