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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"

43003 results found.

  1. Recent GRB BVRcIc field photometry
  2. GRB050520: Radio Observations
  3. XRF 050522: Swift XRT observation
  4. XRF050522, BVRcIc field photometry
  5. XRF 050522 : Lulin observations
  6. XRF050522: Optical Observations
  7. XRF050522: Near-infrared Observations
  8. XRF 050522: KAIT observations
  9. XRF 050522 detected with INTEGRAL
  10. Swift UVOT Observations of GRB 050520
  11. GRB 050520: Swift XRT refined analysis
  12. XRF050509C: Chandra Afterglow Detection
  13. XRF 050509c: Swift XRT Upper Limit
  14. XRF050509c: Radio Observations
  15. RBO Observations of GRB050520
  16. GRB 050520: P200 Observations
  17. GRB050520: Liverpool Telescope follow-up
  18. GRB 050520: TAROT optical limit
  19. GRB 050520: Swift XRT position
  20. GRB 050520: VLT/ULTRACAM observations
  21. GRB 050520: OSN optical observations
  22. GRB 050520: BART optical limit
  23. GRB 050520 - A long GRB detected with INTEGRAL
  24. Swift-BAT trigger 122203 is not a real GRB
  25. XRF 050509C: REM NIR and Optical refined analysis
  26. GRB 050504: Swift XRT afterglow candidate has faded
  27. GRB 050509B and short GRB-SN association? (corrected)
  28. GRB 050509B and short GRB-SN association?
  29. GRB 050509B: Subaru Optical Observations
  30. GRB050502b: Early Observation
  31. GRB050509b, Bok telescope B-band imaging
  32. Refined Chandra analysis of GRB 050509b
  33. GRB050509b, SDSS pre-burst observations
  34. GRB 050509b: Keck/Chandra Cross-Correlation
  35. GRB 050509b: Keck/Chandra Cross-Correlation
  36. Chandra observation of GRB 050509b
  37. GRB 050509b: RAPTOR deep, early limits.
  38. GRB050509B: Optical/Infared observations
  39. GRB 050509b: Swift/UVOT follow-up measurements
  40. GRB 050509b Milagro GeV/TeV Observations
  41. GRB050509B: Optical observations at the Very Large Telescope
  42. GRB 050509b: No Optical Variability in XRT Error Circle
  43. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  44. GRB 050509c: ROTSE-III Optical Limits
  45. GRB 050509B: WSRT Radio Observations
  46. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  47. GRB 050505, early TAROT observation
  48. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  49. GRB 050509b: Further Analysis of Keck LRIS Images
  50. GRB050509c: REM NIR and Optical observations
  51. GRB 050505: SARA Observations
  52. Swift UVOT Follow-up Observations of GRB 050509B
  53. GRB 050509B, Optical Observations
  54. GRB 050509B: Swift/XRT refined analysis
  55. GRB050509a: Swift UVOT observations
  56. GRB 050509b: Optical observations
  57. GRB 050509b: Precision Astrometry
  58. GRB 050509b: Possible Optical Counterpart
  59. Keck/DEIMOS Spectrum of Possible Host Galaxy for GRB050509b
  60. GRB 050509A: Optical observations
  61. GRB 050509b: Optical Counterpart Candidate
  62. GRB050509b: Radio Observations
  63. GRB 050509b: PAIRITEL and WIYN Observations
  64. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  65. GRB 050509b: optical observations
  66. GRB 050509b: Swift XRT Position
  67. GRB 050509B: ROTSE-III Optical Limits
  68. Swift Detection of GRB050509b: A short duration burst
  69. GRB 050509a: Swift XRT Position
  70. Swift Detection of the Burst GRB050509
  71. Swift-BAT detection of GRB 050507
  72. GRB 050505: Keck I-band Magnitude
  73. GRB 050505: early time observations
  74. GRB 050505 - Faulkes Telescope North observations
  75. GRB 050502a: Swift XRT Upper Limit
  76. GRB 050505, simultaneous optical observation
  77. GRB 050505: Further Swift UVOT observations.
  78. GRB050505: AAVSO observations
  79. GRB050416A : 1 GHz limit from GMRT
  80. GRB 050505: Keck absorption spectrum and redshift (z=4.27)
  81. GRB 050505 UVOT
  82. GRB050505: Optical Afterglow Candidate
  83. GRB 050505: Swift XRT Position
  84. GRB050505 Swift-BAT refined analysis
  85. GRB 050502a: Optical Observations
  86. GRB 050416b:Swift XRT afterglow upper limits
  87. GRB 050416b:Swift XRT afterglow upper limits
  88. Swift-BAT detection of GRB050505
  89. GRB 050504: Swift XRT position
  90. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  91. GRB050502b: Afterglow Confirmation
  92. GRB050502: P200 Observations (Correction)
  93. GRB050502: P200 Observations
  94. Swift UVOT observation of GRB 050504
  95. GRB050504: Faulkes North optical robotic limit
  96. GRB050504: P60 Observations
  97. GRB 050504: A long GRB detected with INTEGRAL
  98. GRB (?) 050504: IR Observations, Intriguing Source
  99. GRB 050502b, Optical observations
  100. GRB050502a: P60 Observations (Correction)

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