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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20960 results found.

  1. GRB 100713A: optical observation in Maidanak
  2. GRB100713A: Swift/UVOT observations
  3. GRB 100713A: GROND upper limits
  4. GRB 100713A: TNG optical observations
  5. GRB 100713A: TELMA and 1.5m OSN optical observations
  6. GRB100713A: Swift X-ray afterglow detection
  7. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  8. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  9. GRB 100628A: Chandra observations
  10. GRB 100704: Swift/UVOT Upper Limits
  11. GRB 100615A: Additional Gemini/NIRI observations
  12. Swift/UVOT observations of GRB100702A - correction
  13. Swift/UVOT observations of GRB100702A
  14. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  15. GRB 100702A: Magellan near-IR observations
  16. GRB 100702A: VLT optical observations
  17. XRF 100701A : MAXI/GSC detection of a probable XRF
  18. GRB 100213B: Detection of Fading Optical Afterglow
  19. GRB 100628A: Second epoch of Magellan near-IR observations
  20. GRB 100628A: GROND optical/NIR observations of the host candidate
  21. GRB 100628A: Gemini North Observations
  22. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  23. GRB100625A: GROND confirmation of constant source
  24. GRB 100625A Gemini-South 2nd epoch imaging
  25. GRB 100628A: Magellan near-IR observations
  26. GRB 100628A: Swift/UVOT Upper Limits
  27. GRB100628A: RTT150 optical observations
  28. GRB 100625A: Magellan near-IR Observations
  29. GRB 100625A: Swift/UVOT Upper Limits
  30. GRB 100625A: Gemini candidate afterglow
  31. GRB 100418A: late time optical observations
  32. GRB 100621A: Swift/UVOT observations
  33. GRB 100621A: VLT/X-shooter redshift
  34. GRB 100621A: GROND observation of bright NIR afterglow
  35. GRB 100619A: Swift/UVOT Upper Limits
  36. GRB 100614A: Gemini/NIRI Observations
  37. GRB 100615A: Gemini/NIRI Observations
  38. XRF 100616a : MAXI/GSC detection of a probable XRF
  39. GRB 100615A: Swift/UVOT Upper Limits
  40. GRB 100614A: Swift/UVOT Upper Limits
  41. GRB 100614A: NOT optical upper limits
  42. GRB 100614A: MASTER-Net optical alert observations
  43. GRB 100615A: GROND observations, upper limits
  44. GRB 100615A: PAIRITEL NIR Upper Limits
  45. GRB 100614A: WHT I-band observations
  46. GRB 100614A: BOOTES-2/TELMA optical observations
  47. GRB 100614A: Liverpool Telescope Observations
  48. GRB 100614A: Swift detection of a burst
  49. GRB 100606A: GROND observations
  50. Radio detection of GRB100418a with ATCA
  51. GRB 100606A: Gemini-South imaging
  52. GRB 100606A: Swift/UVOT Upper Limits
  53. GRB 100111A: Maidanak optical observations
  54. GRB 100418A: Maidanak optical observations
  55. GRB 100513A: CrAO optical observations
  56. GRB 100514A: CrAO optical observations
  57. GRB 100528A: GROND detection in all bands
  58. GRB 100528A: NOT optical observation
  59. GRB100526B: GROND Upper limits
  60. GRB 100526B: Swift/UVOT Upper Limits
  61. GRB 100526A: Swift/UVOT Upper Limits
  62. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  63. GRB 100526A: NOT optical upper limit
  64. GRB 100526B: Swift XRT/UVOT observations
  65. GRB 100526A: MASTER-Net optical alert observations
  66. GRB 100522A: GROND observations, upper limits
  67. Swift/UVOT observations of GRB100522A.
  68. GRB 100522A: NIR observations from CAHA
  69. GRB 100418A: CrAO optical observations
  70. GRB 100518A: GROND afterglow observation and photo-z
  71. GRB 100518A: Swift/UVOT Upper Limits
  72. GRB 100518A: BOOTES-3 optical observations
  73. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  74. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  75. GRB 100514A: Swift/UVOT Observations
  76. GRB 100514A: YNAO-GMG observations
  77. GRB 100514A: MASTER-Net optical observations
  78. GRB 100514A: Faulkes Telescope South observations
  79. GRB 100513A: Faulkes Telescope South observations
  80. GRB 100513A: Swift/UVOT upper limits
  81. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  82. GRB 100513A: Lick observations and R-band dropout
  83. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  84. GRB 100513A: PAIRITEL NIR afterglow candidate
  85. GRB 100511A: Super-LOTIS early observations
  86. GRB100508A: Further Swift/UVOT Observations
  87. GRB 100508A: GROND Detection of the optical afterglow
  88. GRB100508A: Swift/UVOT Detection of the Afterglow
  89. GRB 100418A: Keck imaging
  90. GRB 100418A: RTT150 optical observations
  91. GRB 100504A: Swift/UVOT Observations
  92. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  93. GRB 100504A: GROND Upper limits
  94. INTEGRAL observations of Swift GRB trigger 421072
  95. GRB 100420A: EVLA radio observations
  96. GRB 100420A: Gemini discovery of infrared afterglow
  97. GRB 100423A: xinglong TNT optical upper limit
  98. GRB 100427A: Swift XRT and UVOT Upper Limits
  99. GRB 100424a. Radio observations
  100. GRB 100418A: RTT150 optical observations

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