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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26361 results found.

  1. GRB050603: Radio Detection
  2. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  3. GRB 050603: INTEGRAL shows it is not a short GRB
  4. GRB 050525a, infrared observations
  5. GRB050528, XRT observations
  6. GRB050528: updated Liverpool Telescope limits
  7. Swift-BAT GRB 050528: a soft burst
  8. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  9. Possible GRB050528: no candidate from Liverpool Telescope
  10. GRB050525a: Radio Observations
  11. GRB 050509b: refined XRT/Chandra afterglow position analysis
  12. GRB 050525: RTT150, Optical observations
  13. GRB 050525a: SARA Observations
  14. GRB 050525B: Swift-BAT observations
  15. GRB 050525: MITSuME Optical Observation in VRI
  16. GRB050525A,optical observation
  17. GRB050525: Super-LOTIS observations
  18. GRB 050525, spectral lag pseudo-redshift
  19. GRB050306: optical afterglow not confirmed
  20. GRB 050525: BART optical observation
  21. GRB 050525A: BOOTES simultaneous optical observations
  22. GRB 050525A: Swift-BAT refined analysis
  23. GRB050525: Optical observations
  24. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  25. Konus-Wind observation of GRB 050525
  26. GRB 050525: TAROT observations of the early afterglow
  27. INTEGRAL detection of GRB 050525
  28. GRB 050525, infrared observations
  29. GRB 050525: observatons of the optical afterglow
  30. GRB050525: ROTSE-III Refined Analysis
  31. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  32. XRF050522: Radio Observations
  33. Swift/UVOT observation of XRF 050522
  34. GRB 050509A: Further I-band imaging
  35. GRB050522,optical observation
  36. GRB050520,optical observation
  37. XRF 050522: Continued NIR P200 Monitoring
  38. RBO Observations of GRB050522
  39. Recent GRB BVRcIc field photometry
  40. GRB050520: Radio Observations
  41. XRF 050522: Swift XRT observation
  42. XRF050522, BVRcIc field photometry
  43. XRF050522: Optical Observations
  44. XRF050522: Near-infrared Observations
  45. GRB 050520: VLT/ULTRACAM observations
  46. GRB 050520: Swift XRT refined analysis
  47. XRF050509C: Chandra Afterglow Detection
  48. XRF050509c: Radio Observations
  49. GRB 050520: P200 Observations
  50. GRB 050520: TAROT optical limit
  51. GRB 050520: VLT/ULTRACAM observations
  52. XRF 050509c optical afterglow
  53. GRB 050509B and short GRB-SN association? (corrected)
  54. GRB 050509B and short GRB-SN association?
  55. GRB050502b: Early Observation
  56. GRB050509b, Bok telescope B-band imaging
  57. Refined Chandra analysis of GRB 050509b
  58. GRB050509b, SDSS pre-burst observations
  59. GRB 050509b: Keck/Chandra Cross-Correlation
  60. GRB 050509b: Keck/Chandra Cross-Correlation
  61. Chandra observation of GRB 050509b
  62. GRB 050509b: RAPTOR deep, early limits.
  63. GRB050509B: Optical observations at the Very Large Telescope
  64. GRB 050509b: No Optical Variability in XRT Error Circle
  65. GRB 050509a: Swift-BAT refined analysis
  66. GRB 050509c: ROTSE-III Optical Limits
  67. GRB 050505, early TAROT observation
  68. GRB050509c: REM NIR and Optical observations
  69. GRB 050509b: Physical Properties of the Candidate Host galaxy
  70. GRB 050505: SARA Observations
  71. GRB 050509B, Optical Observations
  72. GRB 050509B: Swift/XRT refined analysis
  73. GRB 050509b: Optical observations
  74. GRB 050509A: Optical observations
  75. GRB050509b: Radio Observations
  76. GRB 050509b: PAIRITEL and WIYN Observations
  77. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  78. Swift Detection of GRB050509b: A short duration burst
  79. Swift Detection of the Burst GRB050509
  80. GRB 050505: early time observations
  81. GRB 050505, simultaneous optical observation
  82. GRB050505: AAVSO observations
  83. GRB050416A : 1 GHz limit from GMRT
  84. GRB050505: Optical Afterglow Candidate
  85. GRB050505 Swift-BAT refined analysis
  86. GRB 050416b:Swift XRT afterglow upper limits
  87. GRB 050416b:Swift XRT afterglow upper limits
  88. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  89. GRB050502b: Afterglow Confirmation
  90. GRB050502: P200 Observations (Correction)
  91. GRB050502: P200 Observations
  92. GRB 050504 : R band observation at Lulin observatory
  93. Swift UVOT observation of GRB 050504
  94. GRB 050504, R band Observations
  95. GRB 050502b, V band Observations
  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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