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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"

38145 results found.

  1. GRB 050607: MDM Observation
  2. GRB 050607 optical decay
  3. GRB 050607: RTT150 optical observations
  4. GRB 050607 : Lulin R-band observation
  5. GRB 050607: PROMPT VRcIc Observations
  6. GRB 050607: RAPTOR-S Early Optical Limits
  7. GRB 050525a, Mid-Infrared Observations
  8. GRB 050607: Optical decay and spectral slope
  9. GRB 050607: MDM Observations
  10. GRB050607,optical observation
  11. GRB 050607 - XRT refined data analysis
  12. Optical Afterglow of GRB 050607
  13. GRB050607 optical limit by "Pi of the Sky"
  14. GRB050607: Swift Detection of a long GRB
  15. GRB050607: P60 Observations
  16. GRB 050603: prediction of t_break
  17. Limits on a SN in the field of GRB 050509b
  18. GRB 050603: Redshift
  19. GRB 050603 - XRT data analysis of the first day
  20. Konus-Wind observation of GRB 050603
  21. GRB 050603: Analysis of UVOT data
  22. GRB 050603: Swift XRT Position
  23. GRB050603: Radio Detection
  24. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  25. GRB 050603: Afterglow Identification from LCO
  26. GRB 050603: INTEGRAL shows it is not a short GRB
  27. GRB 050408: jet break in the XRT light curve
  28. GRB 050525a, infrared observations
  29. GRB 050525a, SMARTS optical/IR afterglow observations
  30. Correction to GCN Circ 3502 on GRB 050528
  31. GRB050528: updated Liverpool Telescope limits
  32. Swift-BAT GRB 050528: a soft burst
  33. Update on Swift-BAT GRB 050528 (Trigger 130679)
  34. GRB050528: BOOTES optical candidate (retraction)
  35. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  36. GRB050528: BOOTES optical candidate
  37. Possible GRB050528: no candidate from Liverpool Telescope
  38. Swift-BAT detection of possible GRB 050528
  39. GRB050525a: Radio Observations
  40. GRB 050509b: refined XRT/Chandra afterglow position analysis
  41. GRB 050525: RTT150, Optical observations
  42. GRB050525a: optical upper limits
  43. GRB 050525a: SARA Observations
  44. GRB 050525B: Swift-BAT observations
  45. GRB 050525: MITSuME Optical Observation in VRI
  46. GRB 050525a: MDM Observations
  47. GRB050525A,optical observation
  48. GRB 050525 : Lulin optical afterglow observations
  49. GRB050525: Super-LOTIS observations
  50. GRB 050525, spectral lag pseudo-redshift
  51. GRB 050525a: Gemini/GMOS Spectra
  52. GRB050306: optical afterglow not confirmed
  53. GRB 050525: BART optical observation
  54. GRB 050525A: BOOTES simultaneous optical observations
  55. GRB 050525A: Swift-BAT refined analysis
  56. GRB050525: Optical observations
  57. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  58. GRB 050525: pseudo-redshift
  59. Swift/UVOT UV and optical detections of GRB 050525
  60. Konus-Wind observation of GRB 050525
  61. GRB 050525: TAROT observations of the early afterglow
  62. INTEGRAL detection of GRB 050525
  63. GRB 050525, infrared observations
  64. GRB 050525: Optical observation
  65. GRB 050525: observatons of the optical afterglow
  66. GRB050525: ROTSE-III Refined Analysis
  67. GRB 050525 - Very Bright, Not Short
  68. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  69. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  70. XRF050522: NIR observations of XRT candidate
  71. XRF050522: Radio Observations
  72. GRB 050509A: Further I-band imaging
  73. GRB050522,optical observation
  74. GRB050520,optical observation
  75. XRF 050522: Continued NIR P200 Monitoring
  76. RBO Observations of GRB050522
  77. GRB050509b: optical observations
  78. Recent GRB BVRcIc field photometry
  79. GRB050520: Radio Observations
  80. XRF050522, BVRcIc field photometry
  81. XRF050522: Optical Observations
  82. XRF 050522: KAIT observations
  83. XRF 050522 detected with INTEGRAL
  84. GRB 050520: VLT/ULTRACAM observations
  85. Swift UVOT Observations of GRB 050520
  86. GRB 050520: Swift XRT refined analysis
  87. RBO Observations of GRB050520
  88. GRB 050520: P200 Observations
  89. GRB050520: Liverpool Telescope follow-up
  90. GRB 050520: TAROT optical limit
  91. GRB 050520: Swift XRT position
  92. GRB 050520: VLT/ULTRACAM observations
  93. GRB 050520: OSN optical observations
  94. GRB 050520: BART optical limit
  95. GRB 050520 - A long GRB detected with INTEGRAL
  96. Swift-BAT trigger 122203 is not a real GRB
  97. GRB 050504: Swift XRT afterglow candidate has faded
  98. XRF 050509c optical afterglow
  99. GRB 050509B and short GRB-SN association? (corrected)
  100. GRB 050509B and short GRB-SN association?

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