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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"

26353 results found.

  1. GRB 050406 BAT refined analysis
  2. Konus-Wind observation of GRB 050401
  3. GRB050401: Radio observation at 610 MHz with GMRT
  4. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  5. GRB 050401 Optical Observations
  6. GRB 050401 BAT refined analysis
  7. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  8. GRB 050401: Prompt XRT position
  9. GRB 050331: Swift XRT Position
  10. Konus-Wind observation of GRB 050326
  11. GRB050326: optical limit
  12. GRB050326: optical limit 33min before GRB
  13. GRB 050326 BAT refined analysis
  14. GRB050326: delayed XRT observation
  15. GRB050319, optical observations
  16. GRB050319, color indices
  17. GRB 050319: ROTSE-III Refined Analysis
  18. GRB 050319 R band observations
  19. GRB 050319: Swift-UVOT detection of the afterglow
  20. GRB 050319: NIR afterglow candidate
  21. GRB 050319:Near IR afterglow
  22. GRB 050319: Optical observation
  23. GRB050319,optical observation
  24. Swift Detection of GRB 050319
  25. GRB 050318: Swift/UVOT detection of afterglow emission
  26. GRB050318: Swift XRT position
  27. GRB050223: analysis of the XMM-Newton observation
  28. GRB050316: MASTER before, simultanious and follow up optical
  29. GRB 050306: ROTSE-III early limits
  30. GRB050316: MASTER optical observations
  31. GRB 050315: Swift-BAT further refined analysis
  32. GRB 050315, SMARTS optical/IR afterglow observations
  33. GRB050315: Radio afterglow
  34. GRB 050315: Swift XRT Position
  35. GRB 050315: Early Observations with Swift/UVOT
  36. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  37. GRB 050306: optical afterglow
  38. Swift-BAT trigger 107873: No Swift XRT counterpart
  39. GRB 050306: Confirmation of X-ray afterglow
  40. GRB 050309, Early optical limits from RAPTOR
  41. GRB 050306: further TAROT optical data
  42. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  43. GRB 050306: TAROT optical observations
  44. Ongoing activity of SGR 1806-20 after the giant flare
  45. GRB050215B: Late-Time Swift UVOT Observations
  46. GRB 050126: Confirmation of the NIR afterglow candidate
  47. PROMPT VRcIc Observations of GRB 050223
  48. GRB 050219b: candidate NIR afterglow
  49. IBAS GRB Alert #2321
  50. GRB 050223: optical observations
  51. INTEGRAL detection of GRB 050223
  52. GRB050223: ROTSE-III Optical Observations
  53. GRB050219b: CORRECTION to time of UVOT observations
  54. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  55. GRB 050219b: Swift-BAT detection of a burst
  56. GRB 050219b: CORRECTION: Swift XRT Position
  57. GRB 050219b: Swift XRT Position
  58. GRB 050219a, optical observations
  59. GRB050215b: Swift UVOT Detection of Afterglow Emission
  60. GRB 050215b: XRT confirmation of IR afterglow candidate
  61. GRB050215b: P60 Optical Observations
  62. GRB 050215B: candidate afterglow
  63. GRB 050215b : Lulin follow-up observation
  64. GRB 050215B: UKIRT K-band imaging
  65. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  66. GRB050215A: ROTSE-III Optical Observations
  67. GRB 050209(=U11568): Duration and spectrum
  68. short/hard GRB 050202, optical observations
  69. GRB050209: REM optical observations
  70. GRB 050209 Optical observations
  71. GRB050209: P60 Optical Observations
  72. GRB050209 (=U11568): A Long GRB Detected by HETE
  73. GRB 050202: Second epoch radio observations
  74. GRB050202: Radio Observations
  75. GRB 050202: Short burst detected by Swift-BAT
  76. GRB 050128 Optical observation with REM
  77. GRB 050129: a weak long GRB detected with INTEGRAL
  78. GRB050128: Faulkes Telescope South observations
  79. GRB 050124: Radio Observations
  80. GRB050126: Updated Swift XRT Position
  81. SGR 1806-20: GMRT results at 240 MHz band.
  82. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  83. GRB 050126: Radio Observations
  84. GRB050128 Swift-BAT observations
  85. GRB 050128: Swift XRT prompt afterglow position
  86. GRB050126: MASTER optical limit for KECK OT
  87. GRB050126: Burst Parameters Measured by BAT
  88. GRB050126: MASTER optical observations
  89. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  90. GRB 050124, SMARTS optical/IR observations
  91. GRB 050124 I-band observation
  92. GRB 050124 : Lulin R-band follow-up observation
  93. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  94. GRB 050123 : I-band follow-up observation
  95. GRB050123: optical limit 1.8h before GRB
  96. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  97. CFHTLS optical transient unlikely to be a GRB
  98. GRB 050117, I-band observations
  99. GRB050117: Refined XRT position
  100. GRB050117: MASTER optical observations

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