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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"

28237 results found.

  1. GRB 120701A: Swift/UVOT Detection
  2. GRB 120701A: GROND detection of the afterglow
  3. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  4. Swift Trigger 525554 is noise
  5. GRB 120701A: Swift-XRT afterglow detection and analysis
  6. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  7. GRB 120630A: NOT optical source within the XRT error circle
  8. Swift Trigger 525554 is probably not a GRB
  9. GRB120624B: Chandra observations and afterglow detection
  10. GRB 120624B Further Swift-XRT analysis
  11. GRB 120624B: Swift/UVOT Upper Limits
  12. GRB 120624B: Further analysis of the HAWKI observations
  13. GRB 120624B: Swift-XRT observations
  14. GRB 120624B: GROND upper limits
  15. XRF 120626B: MAXI/GSC detection
  16. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  17. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  18. Swift detection of Ginga 0834-430
  19. Swift detection of IGR J17062-6143
  20. GRB 120624B: optical observations
  21. Konus-Wind observation of GRB 120624B
  22. GRB 120624B: Swift detection of a burst
  23. GRB 120624B: Fermi-LAT Detection
  24. GRB 120624B: Fermi GBM detection
  25. Swift Trigger 524949: Noise fluctuation near a galaxy
  26. GRB 120622A: MAXI/GSC detection
  27. Swift trigger 524642 / SwJ1910.2-0546
  28. Swift Trigger 524642 is Swift J1910.2-0546
  29. Trigger 524584: Swift detection of Algol
  30. Swift triggers (#524542) on a Galactic source
  31. GRB 120614A: MAXI/GSC detection of a burst
  32. GRB 120612A: optical observations
  33. GRB 120612A: Swift/UVOT observations
  34. GRB 120612A: Swift-XRT refined Analysis
  35. GRB 120612A: Enhanced Swift-XRT position
  36. GRB 120612A: Swift detection of a burst
  37. Konus-Wind observation of GRB 120603A
  38. Konus-Wind observation of GRB 120528B
  39. GRB 120528C: MAXI/GSC detection
  40. GRB 120521C redshift estimate
  41. GRB 120528B: MAXI/GSC detection
  42. GRB 120521C: EVLA Localization of Afterglow
  43. GRB 120521C: EVLA 22 GHz Detection
  44. GRB120521B: SSO 2.3m upper limits
  45. GRB 120521A: ATCA 34GHz upper limit
  46. GRB 120521C: Early Tautenburg limits
  47. GRB 120521C: EVLA 22 GHz Upper Limit
  48. GRB 120521A: GROND Upper limits
  49. GRB 120521C: Swift-XRT refined Analysis
  50. GRB 120521C: Keck Observations
  51. GRB 120521C: Swift/UVOT Upper Limits
  52. GRB 120521B: Swift/UVOT Upper Limits
  53. GRB 120521B: GROND Upper limits
  54. GRB 120521A: XRT light curve (Correction to GCN 13326)
  55. GRB 120521A: Swift-XRT refined Analysis
  56. GRB 120521C: PAIRITEL NIR Upper Limits
  57. GRB 120521C: Enhanced Swift-XRT position
  58. GRB 120521C: BOOTES-1 optical observations
  59. GRB 120521C: WHT optical observations
  60. GRB120521C: Liverpool Telescope observations
  61. GRB 120521C: TAROT Calern observatory optical observations
  62. GRB 120521C: Swift detection of a burst
  63. GRB 120521B: Swift-XRT refined Analysis
  64. Swift starts a new program to find fainter transients
  65. GRB 120521A: Swift/UVOT Upper Limits
  66. GRB 120521B: Enhanced Swift-XRT position
  67. GRB120521B: Faulkes Telescope South observations
  68. GRB 120521B: TAROT La Silla observatory optical observations
  69. GRB 120521B: Swift detection of a burst
  70. GRB 120521A: Enhanced Swift-XRT position
  71. GRB 120521A: TAROT La Silla observatory optical observations
  72. GRB 120521A: Swift detection of a short burst
  73. GRB 120512A: A long GRB detected by INTEGRAL
  74. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  75. GRB 120514A: GROND upper limits
  76. GRB 120514A: Swift/UVOT Upper Limits
  77. GRB 120514A: UKIRT IR observations
  78. GRB 120514A: Swift-XRT refined Analysis
  79. GRB 120514A: APEX observations of the submm counterpart
  80. GRB 120514A: Enhanced Swift-XRT position
  81. GRB 120514A: TAROT Calern observatory optical observations
  82. GRB 120514A: Swift detection of a burst
  83. Fermi Trigger 358364818: BOOTES-4 observations
  84. GRB 120510A: Swift XRT and UVOT observations
  85. GRB 120510A: MAXI/GSC detection of a burst
  86. GRB 120422A: SN identification from GTC
  87. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  88. GRB 120422A: P200 NIR detection
  89. GRB 120422A: Gemini-N detection of a supernova
  90. GRB 120422A: i-band re-brightening and possible SN detection
  91. GRB 120422A: optical observations
  92. Swift detection of 4U 1630-47
  93. GRB 120422A: MITSuME Ishigakijima upper limit
  94. Swift Trigger 520928 is probably not a burst
  95. GRB 120424A: MAXI/GSC detection of a burst
  96. GRB 120422A: 272 GHz observations from SMA
  97. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  98. GRB 120422A GROND observations
  99. GRB 120422A: EVLA Detection
  100. GRB 120422A: Gemini redshift of candidate host

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