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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28054 results found.

  1. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  2. Possible GRB050528: no candidate from Liverpool Telescope
  3. GRB050525a: Radio Observations
  4. GRB 050509b: refined XRT/Chandra afterglow position analysis
  5. GRB 050525: RTT150, Optical observations
  6. GRB 050525a: SARA Observations
  7. GRB 050525B: Swift-BAT observations
  8. GRB 050525: MITSuME Optical Observation in VRI
  9. GRB050525A,optical observation
  10. GRB050525: Super-LOTIS observations
  11. GRB 050525, spectral lag pseudo-redshift
  12. GRB050306: optical afterglow not confirmed
  13. GRB 050525: BART optical observation
  14. GRB 050525A: BOOTES simultaneous optical observations
  15. GRB 050525A: Swift-BAT refined analysis
  16. GRB050525: Optical observations
  17. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  18. Konus-Wind observation of GRB 050525
  19. GRB 050525: TAROT observations of the early afterglow
  20. INTEGRAL detection of GRB 050525
  21. GRB 050525, infrared observations
  22. GRB 050525: observatons of the optical afterglow
  23. GRB050525: ROTSE-III Refined Analysis
  24. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  25. XRF050522: Radio Observations
  26. Swift/UVOT observation of XRF 050522
  27. GRB 050509A: Further I-band imaging
  28. GRB050522,optical observation
  29. GRB050520,optical observation
  30. XRF 050522: Continued NIR P200 Monitoring
  31. RBO Observations of GRB050522
  32. Recent GRB BVRcIc field photometry
  33. GRB050520: Radio Observations
  34. XRF 050522: Swift XRT observation
  35. XRF050522, BVRcIc field photometry
  36. XRF050522: Optical Observations
  37. XRF050522: Near-infrared Observations
  38. GRB 050520: VLT/ULTRACAM observations
  39. GRB 050520: Swift XRT refined analysis
  40. XRF050509C: Chandra Afterglow Detection
  41. XRF050509c: Radio Observations
  42. GRB 050520: P200 Observations
  43. GRB 050520: TAROT optical limit
  44. GRB 050520: VLT/ULTRACAM observations
  45. XRF 050509c optical afterglow
  46. GRB 050509B and short GRB-SN association? (corrected)
  47. GRB 050509B and short GRB-SN association?
  48. GRB050502b: Early Observation
  49. GRB050509b, Bok telescope B-band imaging
  50. Refined Chandra analysis of GRB 050509b
  51. GRB050509b, SDSS pre-burst observations
  52. GRB 050509b: Keck/Chandra Cross-Correlation
  53. GRB 050509b: Keck/Chandra Cross-Correlation
  54. Chandra observation of GRB 050509b
  55. GRB 050509b: RAPTOR deep, early limits.
  56. GRB050509B: Optical observations at the Very Large Telescope
  57. GRB 050509b: No Optical Variability in XRT Error Circle
  58. GRB 050509a: Swift-BAT refined analysis
  59. GRB 050509c: ROTSE-III Optical Limits
  60. GRB 050505, early TAROT observation
  61. GRB050509c: REM NIR and Optical observations
  62. GRB 050509b: Physical Properties of the Candidate Host galaxy
  63. GRB 050505: SARA Observations
  64. GRB 050509B, Optical Observations
  65. GRB 050509B: Swift/XRT refined analysis
  66. GRB 050509b: Optical observations
  67. GRB 050509A: Optical observations
  68. GRB050509b: Radio Observations
  69. GRB 050509b: PAIRITEL and WIYN Observations
  70. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  71. Swift Detection of GRB050509b: A short duration burst
  72. Swift Detection of the Burst GRB050509
  73. GRB 050505: early time observations
  74. GRB 050505, simultaneous optical observation
  75. GRB050505: AAVSO observations
  76. GRB050416A : 1 GHz limit from GMRT
  77. GRB050505: Optical Afterglow Candidate
  78. GRB050505 Swift-BAT refined analysis
  79. GRB 050416b:Swift XRT afterglow upper limits
  80. GRB 050416b:Swift XRT afterglow upper limits
  81. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  82. GRB050502b: Afterglow Confirmation
  83. GRB050502: P200 Observations (Correction)
  84. GRB050502: P200 Observations
  85. GRB 050504 : R band observation at Lulin observatory
  86. Swift UVOT observation of GRB 050504
  87. GRB 050504, R band Observations
  88. GRB 050502b, V band Observations
  89. GRB050504: P60 Observations
  90. GRB 050504: A long GRB detected with INTEGRAL
  91. GRB (?) 050504: IR Observations, Intriguing Source
  92. GRB 050502b, Optical observations
  93. GRB050502a: P60 Observations (Correction)
  94. GRB050502a: P60 Observations
  95. Renewal of SGR 1806-20 activity
  96. GRB050502B Swift-BAT refined analysis
  97. Swift UVOT refined analysis
  98. GRB 050502a : R band observation at Lulin observatory
  99. GRB 050502b : optical observation at Lulin observatory
  100. GRB 050502A: Redshift measurement based on Keck HIRES Observations

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