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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"

18379 results found.

  1. GRB050316: MASTER optical observations
  2. GRB 050315 I-band observations
  3. GRB050315: Radio afterglow
  4. GRB 050315: Early Observations with Swift/UVOT
  5. GRB 050306: Radio Observations
  6. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  7. GRB 050306: optical afterglow
  8. Swift-BAT trigger 107873: No Swift XRT counterpart
  9. GRB 050306: Confirmation of X-ray afterglow
  10. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  11. Swift 107873: P60 Optical Observations
  12. GRB 050306: R-band observations
  13. GRB 050306: REM optical-infrared observations
  14. GRB 050306: Possible X-ray Afterglow Position from the Swift
  15. GRB 050306: TAROT optical observations
  16. GRB 050306,optical observation
  17. GRB050215B: Late-Time Swift UVOT Observations
  18. PROMPT VRcIc Observations of GRB 050223
  19. XMM-Newton Images of GRB 050223
  20. GRB 050219b: candidate NIR afterglow
  21. GRB050223 XMM-Newton observation
  22. GRB050223: ROTSE-III Optical Observations
  23. GRB 050223: Swift XRT Position
  24. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  25. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  26. GRB 050219a: Optical observations from LCO
  27. GRB 050219b: Optical and near-IR observations from LCO
  28. GRB 050215b: XRT confirmation of IR afterglow candidate
  29. GRB050215b: P60 Optical Observations
  30. GRB 050215b: Swift XRT Source Variability
  31. GRB 050215b, BOOTES-2 simultaneous optical observations
  32. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  33. GRB050215A: ROTSE-III Optical Observations
  34. GRB050209: TAROT optical observations
  35. GRB050209: REM optical observations
  36. GRB 050209 I-band observation
  37. GRB 050209 Optical observations
  38. GRB050209: P60 Optical Observations
  39. GRB 050128: Radio observations
  40. GRB 050202: Short burst detected by Swift-BAT
  41. GRB 050128 Optical observation with REM
  42. GRB 050128: near-infrared observations with REM
  43. GRB050128,optical observations
  44. GRB 050128: Swift XRT prompt afterglow position
  45. GRB050126: MASTER optical limit for KECK OT
  46. GRB050126: Burst Parameters Measured by BAT
  47. GRB050126: MASTER optical observations
  48. GRB 050124 I-band observation
  49. GRB 050124: NIR Candidates from Keck/NIRC
  50. GRB050124,optical observation
  51. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  52. GRB050123,optical observation
  53. GRB 050123: KAIT observations
  54. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  55. GRB050117: MASTER optical observations
  56. MASTER:GRB050117 SWIFT
  57. GRB050117: Swift XRT Position
  58. SGR 1806-20: Further low frequency GMRT results
  59. SGR1806-20: Swift-BAT observations of two additional bursts
  60. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  61. SGR 1806-20, RHESSI observations of the 041227 giant flare
  62. GRB 041217: Optical observations
  63. GRB041223: decay of the afterglow
  64. GRB 041224: near-infrared observations with REM
  65. GRB041223: optical and NIR observations with REM
  66. GRB 041219: TAROT optical observations
  67. GRB 041218: TAROT optical observations
  68. GRB 041223: J-band observations of the afterglow
  69. GRB 041219c: PROMPT Observations
  70. GRB041223: Swift-BAT detection of a bright long burst
  71. GRB 041218 Optical Observations
  72. GRB041219: Continued NIR Observations
  73. GRB 041219 ,optical observation
  74. GRB 041219: Radio Afterglow Detection
  75. GRB 041218 : Radio Observations
  76. GRB 041218: R-band optical observations
  77. GRB041218: optical observations
  78. GRB041219: Confirmed NIR Afterglow
  79. GRB041218: Continued P60 Optical Observations
  80. Swift-BAT detection of the bright long burst GRB041219
  81. GRB 041219: Infrared Afterglow Candidate
  82. GRB041219, BVRcIc field calibration
  83. GRB 041219: Infrared Afterglow Candidate
  84. GRB041218, BVRcIc field calibration
  85. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  86. GRB 041219 - A long GRB detected by INTEGRAL
  87. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  88. GRB 041217: PROMPT Observations
  89. GRB041217: NIR and optical observations with REM
  90. GRB041217: Infrared Observations
  91. GRB041217: The First GRB Located On-Board Swift
  92. GRB041211: Faulkes Telescope continued optical monitoring
  93. Optical transient (GRB?) in Lynx
  94. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  95. GRB041211: RAPTOR observations
  96. GRB041211: Ashra Prototype optical observation
  97. GRB041211, BVRcIc field calibration
  98. GRB041211,optical observation
  99. GRB 041211: Infrared Observations
  100. GRB 041211: KAIT observations

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