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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"

28128 results found.

  1. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  2. GRB 070125: optical observation
  3. GRB 070125: WSRT Radio Detection
  4. GRB070129: MITSuME optical observation
  5. Radio detection of GRB 070125
  6. GRB 070129, Swift-BAT refined analysis of a particularly long
  7. GRB 070129: Xinglong TNT optical Upper Limit
  8. GRB 070129: Swift-XRT Refined Analysis
  9. GRB 070129: VLT observations
  10. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  11. GRB 070129: Swift detection of a burst
  12. GRB 070126: Swift/UVOT refined analysis
  13. GRB 070125: further AAVSO optical observations
  14. GRB 070125: MITSuME Okayama optical observation
  15. GRB 070125: AAVSO optical observations
  16. GRB 070125: optical observations
  17. GRB 070126: VLT observations
  18. GRB070126: Swift-XRT possible detection of an afterglow
  19. GRB 070125: PROMPT detections
  20. GRB 070125: WSRT Radio Observations
  21. GRB 070125: UVOT Detection in Ultraviolet Filters
  22. GRB070124: Swift-XRT Observation
  23. Possible GRB 070126: Swift/UVOT Upper Limit
  24. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  25. GRB 070125: Xinglong TNT optical observations
  26. GRB 070125: Continued P60 Observations
  27. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  28. GRB 070125: Lick 3m Spectroscopy
  29. GRB070125: Swift-XRT Refined Analysis
  30. GRB 070125: SARA detection in R
  31. GRB 070125: P60 Optical Afterglow Candidate
  32. GRB 070126?: Swift detection of a possible burst
  33. IPN-BAT localization of GRB070125 (very long duration, intense)
  34. GRB 070110: optical break
  35. GRB 070110: Continued Detection and Request for Ground Followup
  36. GRB 050904: Second Epoch of HST/NICMOS Observations
  37. GRB 070110: Ep,i - Eiso correlation
  38. GRB 070110: VLT R-band photometry
  39. GRB 070110 declared a "Burst of Interest" by Swift team
  40. Further Retractions of previous Swift-BAT triggers
  41. Trigger 255685: Swift detection of a possible burst
  42. GRB 070110: VLT absorption redshift
  43. GRB 070110: UVOT Observations of a Candidate Afterglow
  44. GRB070110: Swift XRT Team refined analysis
  45. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  46. GRB 070110: Swift detection of a burst with a possible optical afterglow
  47. GRB070107: Swift/XRT refined analysis
  48. GRB 070107: Possible UVOT Afterglow
  49. GRB 070107: Swift/XRT position
  50. GRB 070107: Swift detection of a burst
  51. VLA observation of GRB 061222B
  52. VLA detection of GRB 061222A
  53. GRB070103: KPNO 4m+FLAMINGOS J limit
  54. GRB 070103: Swift/UVOT Upper limits
  55. GRB070103: Swift XRT refined analysis
  56. GRB 070103: NOT observations
  57. GRB 070103: Swift detection of a burst
  58. Retractions of previous Swift-BAT triggers
  59. GRB061222a: optical observations
  60. GRB 061210: Swift/XRT Astrometry Correction
  61. GRB 050826: MDM Redshift
  62. GRB 061222B: TAROT La Silla observatory early optical observations
  63. GRB 061222A: MITSuME Akeno optical upper limits
  64. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  65. GRB 061222B: MITSuME Akeno optical upper limits
  66. GRB 061222A: Xinglong Optical Limit
  67. GRB 061222A: Gemini Afterglow Candidate
  68. GRB061222A Swift/UVOT: Upper Limits
  69. GRB 061222B: Swift/UVOT Upper limits
  70. GRB 061222B: Observation with the KANATA 1.5m telescope
  71. GRB061222B: Swift-XRT Refined Analysis
  72. GRB 061222A: Observation with the KANATA 1.5m telescope
  73. GRB 061222B: BOOTES-IR optical observations
  74. GRB 061222A: Swift-XRT refined analysis
  75. GRB 061222B: REM NIR/optical observations
  76. GRB 061222b, SMARTS optical/IR afterglow observations
  77. GRB 061222B: TAROT La Silla observatory afterglow observation
  78. GRB 061222B: TAROT La Silla observatory optical observations
  79. GRB 061222b: Magellan redshift
  80. GRB 061222B: Swift detection of a burst
  81. GRB 061222b: optical afterglow
  82. GRB 061222A: Prompt ROTSE-III Optical Limits
  83. GRB 061222: Swift detection of a burst
  84. GRB 061217: Astrometry-Corrected XRT Position
  85. GRB 061201: Magellan redshift of nearby galaxy
  86. GRB 061217: Confirmation of host candidate
  87. GRB 061217: Object ib GCN 5948 is a star
  88. GRB 061217: Extended object in the revised XRT error circle
  89. GRB 061217, Candidate host galaxy
  90. GRB 061217 - Swift/XRT position correction
  91. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  92. GRB 061201: Magellan Redshift of nearby Abell cluster
  93. GRB 061217: TAROT Calern observatory optical observations
  94. GRB061217: VLT NIR observations
  95. Swift triggers (#251863) on a possible burst
  96. GRB 061217, SMARTS optical observations
  97. GRB061217: Swift/UVOT refined analysis.
  98. GRB 061217: optical observations at Calar Alto
  99. GRB061217 - Swift/XRT refined analysis
  100. GRB 061217: Swift detection of a short hard burst

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