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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"

41952 results found.

  1. GRB 060206: RAPTOR observations of afterglow candidate variability.
  2. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  3. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  4. GRB060206: Optical afterglow
  5. GRB060206: Swift-BAT detection of a burst
  6. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  7. GRB060203: WHT Z-band observations
  8. BAT GRB 060204C is probably not a GRB
  9. GRB060204C: optical observation
  10. GRB 060204A: Swift XRT upper limit
  11. GRB 060204A: FRAM optical observations
  12. GRB060204B: Swift/UVOT refined analysis
  13. GRB 060204C: optical observations
  14. Swift XRT Observation of GRB 060204C
  15. GRB 060204B: Swift-BAT refined analysis
  16. GRB060204B: Swift XRT Team Refined Analysis
  17. GRB 060204C: OSN limits
  18. GRB 060204b: Keck/LRIS Afterglow Confirmation
  19. GRB 060204C: Swift-BAT detection of a burst
  20. GRB 060124: Radio Observations
  21. GRB060204B: Faulkes OT candidate
  22. GRB 060204B: ART optical limit
  23. GRB060204B, optical observation
  24. GRB060204B - SDSS pre-burst observations
  25. GRB 060204B: Swift detection of a burst
  26. GRB 060204: a long GRB detected by INTEGRAL
  27. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  28. GRB 060203: RTT150 optical observations
  29. GRB060203: Swift XRT Team Refined Analysis
  30. GRB060203 - Swift UVOT observation
  31. GRB 060203: IR Counterpart
  32. GRB060203: Observations with SARA
  33. GRB 060203: P60 Confirmation of Optical Afterglow
  34. Possible GRB 060203: candidate optical counterpart
  35. Possible GRB 060203: optical observations at Asiago
  36. GRB 060202: PROMPT Observations
  37. GRB 060202: Gemini-N J, H, K_s observations
  38. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  39. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  40. GRB 060202: Refined analysis of the Swift-BAT burst
  41. GRB060202, optical observation
  42. GRB 060202: Swift XRT Team Refined Analysis
  43. GRB060202: Faulkes North observation
  44. GRB 060202: Swift detection of a burst
  45. GRB 060121: Gemini Late-time Observations
  46. Erratum: SDSS pre-burst observations of GRB fields
  47. GRB 060130: PROMPT Observations
  48. GRB 051211A: MDM Observations
  49. GRB 060123: Gemini spectroscopy of the putative host galaxy
  50. GRB 060123: VLA Radio Observations
  51. GRB060130: Optical imaging
  52. GRB060130: REM infrared observations
  53. GRB 060130, SMARTS optical observations
  54. GRB 060130: FRAM optical observations
  55. GRB 060130: a long GRB detected with INTEGRAL
  56. Possible GRB 051221B: MDM Correction
  57. GRB050121: optical observation
  58. GRB050121b: optical observation
  59. GRB 060121: Confirmation of NIR Afterglow
  60. GRB060124: optical observation
  61. GRB060124: optical observations
  62. GRB 060123: Swift refined analysis of an unusual GRB
  63. GRB060124, BVRcIc field calibration
  64. GRB060105: refined analysis of the Suzaku observation
  65. GRB060124 optical observations
  66. GRB 060121: Probable Detection of NIR Afterglow
  67. GRB060124: optical observation
  68. GRB 060116 HST observations
  69. GRB 060124: HETE detection and spectrum of the main peak
  70. Refined XRT Position for GRB 060123
  71. Konus-Wind observation of GRB 060124
  72. GRB060124: detailed XRT analysis
  73. GRB 060124 Optical Observations
  74. GRB 060124: ART optical limits during the burst
  75. GRB060123: Optical and IR Imaging
  76. GRB 060123: P200 Observations
  77. GRB 060124: Keck optical spectrum
  78. GRB 060124: Keck Absorption Redshift
  79. GRB 060124: MDM Optical Spectrum
  80. GRB 060124: XRT refined analysis
  81. GRB 060124: R band Observations
  82. GRB060124: optical observations at Asiago
  83. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  84. GRB060123: SDSS pre-burst observations
  85. GRB 060123: Swift detection of a very long, faint burst
  86. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  87. GRB 060121: OHP optical limits
  88. GRB 060124: TAROT optical limits
  89. GRB 060124: Confirmation of the Afterglow
  90. GRB 060124: XRT position
  91. GRB 060124: Optical Afterglow Candidate from Tautenburg
  92. GRB060124, optical observation
  93. GRB 050124 : Kiso Optical limit
  94. GRB 060124: Optical Observations at Tautenburg
  95. GRB 060117: Suzaku WAM observation of the prompt emission
  96. GRB 060111B: Suzaku WAM observation of the prompt emission
  97. GRB 060124: Swift-BAT detection of a burst
  98. GRB 060116: Radio Detection
  99. GRB 060116: MARGE optical observations
  100. GRB 060121: Swift/UVOT upper limits

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