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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"

39364 results found.

  1. GRB060209: RTT150 optical observations
  2. GRB 060209 : TAROT optical observation
  3. GRB060209A: MASTER optical observation
  4. GRB 060209(?): Swift-BAT detection of a possible burst
  5. GRB 060206: near-infrared observations (JK' imaging)
  6. GRB 060206: WSRT Radio Observations
  7. GRB 060203: Swift/UVOT upper limits
  8. GRB 060206: TTT Observations
  9. GRB 060206: More PROMPT Detections
  10. GRB 060121 : WIDGET Pre-trigger limit
  11. GRB 060206: Tenagra II Observations
  12. GRB 060206: PROMPT Detections
  13. Retraction of orphan GRB afterglow candidate
  14. GRB060204a: Swift XRT Source is not GRB Afterglow
  15. GRB 060206: optical observations at Asiago
  16. Orphan GRB Afterglow candidate
  17. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  18. GRB 060206: Subaru/FOCAS optical spectroscopy
  19. GRB 060206: IR Detection of the Afterglow
  20. GRB 060206: Lick 3m Spectroscopy
  21. GRB 060204A: ROSAT Pointing
  22. GRB 060206: Super-LOTIS observations
  23. GRB060204A: Swift/UVOT observations
  24. GRB 060206: Swift-BAT refined analysis
  25. GRB 060206 : Lulin optical observations
  26. GRB060206: SDSS Pre-Burst Observations
  27. GRB060206: Swift XRT Refined Analysis
  28. GRB060206: Liverpool Telescope observation
  29. GRB 060206: Spectroscopic Redshift
  30. GRB060206: P60 Optical Observations
  31. GRB 060206: KAIT observations
  32. GRB060206: Swift XRT Position
  33. GRB060206: SARA Detection
  34. GRB 060206: RAPTOR observations of afterglow candidate variability.
  35. GRB 060206: High redshift burst
  36. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  37. GRB060206: Swift-BAT detection of a burst
  38. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  39. BAT GRB 060204C is probably not a GRB
  40. GRB060204C: optical observation
  41. GRB 060204B: BVRi-band detections of optical afterglow
  42. GRB 060204A: Swift XRT upper limit
  43. GRB 060204A: FRAM optical observations
  44. GRB060204B: Swift/UVOT refined analysis
  45. GRB 060204C: optical observations
  46. Swift XRT Observation of GRB 060204C
  47. GRB 060204B: Swift-BAT refined analysis
  48. GRB 060204B: ART early limit
  49. GRB060204B: Swift XRT Team Refined Analysis
  50. GRB 060204C: OSN limits
  51. GRB 060204b: Keck/LRIS Afterglow Confirmation
  52. GRB 060204C: BOOTES-IR optical limits
  53. GRB 060204C: Liverpool Telescopes optical limit
  54. GRB 060204C: ROTSE-III Optical Limits
  55. GRB 060204C: Swift-BAT detection of a burst
  56. GRB 060124: Radio Observations
  57. GRB060204B: Faulkes OT candidate
  58. GRB 060204B: ART optical limit
  59. GRB 060204A: further INTEGRAL results
  60. GRB060204B - SDSS pre-burst observations
  61. GRB 060203: Swift-BAT refined analysis
  62. GRB 060204B: Swift detection of a burst
  63. GRB 060204: a long GRB detected by INTEGRAL
  64. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  65. GRB 060203: RTT150 optical observations
  66. GRB060203: Swift XRT Team Refined Analysis
  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. Possible GRB 060203: optical observations at Asiago
  73. GRB 060202: PROMPT Observations
  74. GRB 060202: GETS observation
  75. GRB 060202: Gemini-N J, H, K_s observations
  76. GRB 060202 : Kiso B and R band limit
  77. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  78. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  79. GRB 060202: Refined analysis of the Swift-BAT burst
  80. GRB 060202: Swift/UVOT upper limits
  81. GRB 060202: Swift XRT Team Refined Analysis
  82. GRB 060202 : Lulin R and I band limit
  83. GRB060202: Faulkes North observation
  84. GRB 060202: Swift detection of a burst
  85. GRB 060121: Gemini Late-time Observations
  86. Erratum: SDSS pre-burst observations of GRB fields
  87. GRB 060130: PROMPT Observations
  88. GRB 060130: Swift/XRT observation
  89. GRB 051211A: MDM Observations
  90. GRB 060123: Gemini spectroscopy of the putative host galaxy
  91. GRB 060123: VLA Radio Observations
  92. GRB060130: Optical imaging
  93. GRB060130: REM infrared observations
  94. GRB 060130, SMARTS optical observations
  95. GRB 060130: FRAM optical observations
  96. GRB 060130: further INTEGRAL IBIS results
  97. GRB 060130: a long GRB detected with INTEGRAL
  98. Possible GRB 051221B: MDM Correction
  99. GRB050121: optical observation
  100. GRB050121b: optical observation

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