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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"

45713 results found.

  1. GRB 050626 optical observations
  2. GRB 050626: Swift XRT observations
  3. GRB 050701
  4. GRB 050701, optical observations
  5. GRB 050408: ARC 3.5-meter NIR Observations
  6. GRB 050701: Refined XRT analysis
  7. Swift UVOT observations of GRB 050701
  8. GRB050701: Swift-BAT Refined analysis
  9. GRB 050701: Swift XRT afterglow position
  10. Swift trigger 143708 is really GRB 050701
  11. GRB 050607, radio observations
  12. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  13. GRB 050626 - Correction to GCN 3552
  14. GRB 050626 - a long GRB detected with INTEGRAL
  15. GRB 050525A: Swift Late-Time Decay Rate
  16. GRB050525a: HST Observations
  17. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  18. H3804: A Possible New XRB Detected by HETE
  19. H3800 and H3801 on 2005 June 11: two bursts from SGR1806-20 localized by HETE
  20. XRF 050509c: Optical monitoring
  21. Konus-Wind observation of an intermediate burst from SGR 1806-20
  22. IBAS Alert #2512 is NOT a GRB
  23. XRF050509c: Radio Detection
  24. GRB 050416(a): Host Galaxy Redshift Determination
  25. GRB 050607: MDM Observation
  26. GRB 050607 optical decay
  27. GRB 050607: RTT150 optical observations
  28. GRB050607: refined analysis of prompt REM observations
  29. Swift/UVOT observations of GRB050607
  30. GRB 050607 : Lulin R-band observation
  31. GRB 050607: PROMPT VRcIc Observations
  32. GRB 050607: RAPTOR-S Early Optical Limits
  33. GRB050607: KAIT optical limits
  34. GRB 050525a, Mid-Infrared Observations
  35. GRB 050607: Optical decay and spectral slope
  36. GRB 050607: MDM Observations
  37. GRB050607,optical observation
  38. GRB 050607 - XRT refined data analysis
  39. Optical Afterglow of GRB 050607
  40. GRB050607 optical limit by "Pi of the Sky"
  41. GRB050607: Swift Detection of a long GRB
  42. GRB050607: P60 Observations
  43. GRB050607: prompt REM observations
  44. GRB 050603: prediction of t_break
  45. Limits on a SN in the field of GRB 050509b
  46. GRB 050603: Redshift
  47. GRB 050603 - XRT data analysis of the first day
  48. Konus-Wind observation of GRB 050603
  49. GRB 050603: Analysis of UVOT data
  50. GRB050603: Fading Afterglow observed by Swift UVOT
  51. GRB050603, submillimetre observations
  52. GRB 050603: Swift XRT Position
  53. GRB050603: Radio Detection
  54. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  55. GRB 050603: Afterglow Identification from LCO
  56. GRB 050603: INTEGRAL shows it is not a short GRB
  57. Swift/BAT Detection of GRB050603
  58. GRB 050408: jet break in the XRT light curve
  59. GRB 050525a, infrared observations
  60. GRB 050525a, SMARTS optical/IR afterglow observations
  61. GRB050528, XRT observations
  62. Correction to GCN Circ 3502 on GRB 050528
  63. GRB050528: updated Liverpool Telescope limits
  64. Swift-BAT GRB 050528: a soft burst
  65. Update on Swift-BAT GRB 050528 (Trigger 130679)
  66. GRB050528: BOOTES optical candidate (retraction)
  67. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  68. GRB050528: BOOTES optical candidate
  69. Possible GRB050528: no candidate from Liverpool Telescope
  70. Swift-BAT detection of possible GRB 050528
  71. GRB050525a: Radio Observations
  72. GRB 050509b: refined XRT/Chandra afterglow position analysis
  73. GRB 050525: RTT150, Optical observations
  74. GRB050525a: optical upper limits
  75. GRB 050525a: SARA Observations
  76. GRB 050525B: Swift-BAT observations
  77. GRB 050525: MITSuME Optical Observation in VRI
  78. GRB 050525a: MDM Observations
  79. GRB050525A,optical observation
  80. GRB 050525 : Lulin optical afterglow observations
  81. GRB050525: Super-LOTIS observations
  82. GRB 050525, spectral lag pseudo-redshift
  83. GRB 050525a: Gemini/GMOS Spectra
  84. GRB050306: optical afterglow not confirmed
  85. GRB 050525: BART optical observation
  86. GRB 050525A: BOOTES simultaneous optical observations
  87. GRB 050525A: Swift-BAT refined analysis
  88. GRB050525: Optical observations
  89. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  90. GRB 050525: pseudo-redshift
  91. Swift/UVOT UV and optical detections of GRB 050525
  92. Konus-Wind observation of GRB 050525
  93. GRB 050525: TAROT observations of the early afterglow
  94. INTEGRAL detection of GRB 050525
  95. GRB 050525, infrared observations
  96. GRB 050525: Optical observation
  97. GRB 050525: observatons of the optical afterglow
  98. GRB050525: ROTSE-III Refined Analysis
  99. GRB 050525 - Very Bright, Not Short
  100. GRB 050525: Swift Detection of a Bright, Possibly Short Burst

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