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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"

45550 results found.

  1. GRB 060206: near-infrared observations (JK' imaging)
  2. GRB 060206: WSRT Radio Observations
  3. GRB 060203: Swift/UVOT upper limits
  4. GRB 060206: TTT Observations
  5. GRB 060206: More PROMPT Detections
  6. GRB 060121 : WIDGET Pre-trigger limit
  7. GRB 060206: Tenagra II Observations
  8. GRB 060206: PROMPT Detections
  9. Retraction of orphan GRB afterglow candidate
  10. GRB060204a: Swift XRT Source is not GRB Afterglow
  11. GRB 060206: optical observations at Asiago
  12. Orphan GRB Afterglow candidate
  13. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  14. GRB 060206: Subaru/FOCAS optical spectroscopy
  15. GRB 060206: IR Detection of the Afterglow
  16. GRB 060206: Lick 3m Spectroscopy
  17. GRB 060204A: ROSAT Pointing
  18. GRB 060206: Super-LOTIS observations
  19. GRB060204A: Swift/UVOT observations
  20. GRB 060206: Swift-BAT refined analysis
  21. GRB 060206 : Lulin optical observations
  22. GRB060206: SDSS Pre-Burst Observations
  23. GRB060206: Swift XRT Refined Analysis
  24. GRB060206: Liverpool Telescope observation
  25. GRB 060206: Spectroscopic Redshift
  26. GRB060206: P60 Optical Observations
  27. GRB 060206: KAIT observations
  28. GRB060206: Swift XRT Position
  29. GRB060206: SARA Detection
  30. GRB 060206: RAPTOR observations of afterglow candidate variability.
  31. GRB 060206: High redshift burst
  32. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  33. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  34. GRB060206: Optical afterglow
  35. GRB060206: Swift-BAT detection of a burst
  36. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  37. GRB060203: WHT Z-band observations
  38. BAT GRB 060204C is probably not a GRB
  39. GRB060204C: optical observation
  40. GRB 060204B: BVRi-band detections of optical afterglow
  41. GRB 060204A: Swift XRT upper limit
  42. GRB 060204A: FRAM optical observations
  43. GRB060204B: Swift/UVOT refined analysis
  44. GRB 060204C: optical observations
  45. Swift XRT Observation of GRB 060204C
  46. GRB 060204B: Swift-BAT refined analysis
  47. GRB 060204B: ART early limit
  48. GRB060204B: Swift XRT Team Refined Analysis
  49. GRB 060204C: OSN limits
  50. GRB 060204b: Keck/LRIS Afterglow Confirmation
  51. GRB 060204C: BOOTES-IR optical limits
  52. GRB 060204C: Liverpool Telescopes optical limit
  53. GRB 060204C: ROTSE-III Optical Limits
  54. GRB 060204C: Swift-BAT detection of a burst
  55. GRB 060124: Radio Observations
  56. GRB 060204B: ART optical limit
  57. GRB 060204A: further INTEGRAL results
  58. GRB060204B, optical observation
  59. GRB060204B - SDSS pre-burst observations
  60. GRB 060203: Swift-BAT refined analysis
  61. GRB 060204B: Swift detection of a burst
  62. GRB 060204: a long GRB detected by INTEGRAL
  63. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  64. GRB 060203: RTT150 optical observations
  65. GRB060203: Swift XRT Team Refined Analysis
  66. GRB060203 - Swift UVOT observation
  67. Swift-BAT trigger is GRB 060203
  68. GRB 060203: IR Counterpart
  69. GRB060203: Observations with SARA
  70. GRB 060203: P60 Confirmation of Optical Afterglow
  71. Possible GRB 060203: candidate optical counterpart
  72. Swift BAT Trigger 180151: Swift XRT source detection
  73. Possible GRB 060203: optical observations at Asiago
  74. GRB 060202: PROMPT Observations
  75. Swift-BAT trigger 180151 is unknown origin at this time
  76. GRB 060202: GETS observation
  77. GRB 060202: Gemini-N J, H, K_s observations
  78. GRB 060202 : Kiso B and R band limit
  79. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  80. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  81. GRB 060202: Refined analysis of the Swift-BAT burst
  82. GRB060202, optical observation
  83. GRB 060202: Swift/UVOT upper limits
  84. GRB 060202: Swift XRT Team Refined Analysis
  85. GRB 060202 : Lulin R and I band limit
  86. GRB060202: Faulkes North observation
  87. GRB 060202: Swift detection of a burst
  88. GRB 060121: Gemini Late-time Observations
  89. Erratum: SDSS pre-burst observations of GRB fields
  90. GRB 060130: PROMPT Observations
  91. GRB060130: Further R-band imaging
  92. GRB 060130: Swift/XRT observation
  93. GRB 051211A: MDM Observations
  94. GRB 060123: Gemini spectroscopy of the putative host galaxy
  95. GRB 060123: VLA Radio Observations
  96. GRB060130: Optical imaging
  97. GRB060130: REM infrared observations
  98. GRB 060130, SMARTS optical observations
  99. GRB 060130: FRAM optical observations
  100. GRB 060130: further INTEGRAL IBIS results

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