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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"

16149 results found.

  1. GRB 110213B: Swift/UVOT observations
  2. Swift XRT and UVOT Observations of OT 110215
  3. OT 110215: NIR observations from NOT of GRB candidate
  4. GRB 110213A: optical observations in CrAO
  5. GRB 110213B: GROND observations of the optical/NIR afterglow
  6. GRB 110213A: optical observations in Mondy
  7. OT 110215: possible GRB from 2MASS J00264184+8324093
  8. Swift/UVOT observations of GRB110210a.
  9. GRB 110210A: optical upper limit
  10. GRB 110213B: Gemini South Redshift
  11. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  12. GRB 110213B: P60 Optical Afterglow Candidate
  13. GRB 110213A: TNT optical observations
  14. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  15. Swift GRB110213A: interesting behaviour
  16. GRB 110205A: Konkoly optical observations
  17. GRB 110213A: MITSuME Akeno Optical Observation
  18. GRB110213A: MITSuME Okayama Optical Observation
  19. GRB 110213A: THO optical observations
  20. GRB 110213A: Lightbuckets Optical Observations
  21. GRB 110213A: optical observations
  22. GRB110212A: MITSuME Okayama optical upper limits
  23. GRB 110213A: GRAS011 optical observations
  24. GRB 110213A: Bok Telescope Redshift
  25. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  26. GRB 110213A: P60 Optical Afterglow Detection
  27. GRB 110213A: Swift detection of a burst with optical afterglow
  28. GRB 110212A: GRT Optical Observation
  29. GRB 110212A: SARA-N Optical Limits
  30. GRB110212A: BOOTES-2/TELMA optical limits
  31. GRB 110212A: ROTSE-III Optical Limits
  32. GRB 110205A: detection of optical linear polarization from CAHA
  33. GRB 110210A: optical upper limit
  34. GRB 110201A: optical observations
  35. GRB 110208A: Magellan confirmation of the optical afterglow
  36. Swift/UVOT observations of GRB110208a
  37. GRB 110208A: Potential afterglow from Magellan
  38. GRB 110208A: Magellan optical observations
  39. GRB 110206A: SMARTS optical/IR afterglow decay
  40. GRB 110205A: optical observations in Mondy observatory
  41. GRB 110205A : HCT optical observations
  42. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  43. GRB 110207A: TAROT Calern observatory optical observations
  44. GRB 110205A - Continued PAIRITEL NIR Observations
  45. GRB 110205A: WSRT radio observation
  46. GRB110205A: CARMA 3mm Observations
  47. GRB 110207A: MASTER prompt and early optical observations
  48. GRB 110206A: TAROT La Silla observatory optical observations
  49. GRB 110205A: Lightbuckets Optical Observations
  50. GRB 110205A : Lulin optical observation
  51. GRB110205A: MITSuME Ishigakijima Optical Observation
  52. GRB110205A: MITSuME Okayama Optical Observation
  53. GRB110205A: SMA 1.3mm Observations
  54. GRB 110205A: Swift/UVOT Continuing Observations
  55. GRB 110205A: Lulin optical observations and temporal decay index
  56. GRB 110205A: Newcastle Observatory Optical Observations
  57. GRB 101225A is likely at z~0
  58. GRB 110205A: optical flare confirmation
  59. GRB 110205A: NOT redshift confirmation
  60. GRB 110205A: FAST Redshift
  61. GRB 110205A: GRAS005 optical observations
  62. GRB 110205A: PAIRITEL NIR Afterglow Detection
  63. GRB 110205A: TAROT Calern observatory detection of an optical flare
  64. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  65. GRB 110205A: TAROT Calern observatory optical detection
  66. GRB 110205A: Swift detection of a burst with an optical candidate
  67. GRB110201A: MITSuME Okayama optical upper limits
  68. Swift/UVOT observations of GRB110201A
  69. GRB 110201A: MASTER optical observations
  70. GRB110128A: MITSuME Okayama optical upper limits
  71. GRB 101112A: Maidanak and CrAO optical observations
  72. GRB110128A: TNG NIR observations
  73. GRB 110128A: TAROT-Calern refined analysis
  74. GRB 110128A: Swift/UVOT observations
  75. GRB 110128A: VLT/X-shooter redshift
  76. GRB 110106B, radio observations
  77. GRB 110120A: MASTER optical observations
  78. GRB 101225A: CQUEAN optical observation
  79. GRB 110106A: CrAO optical observations
  80. GRB 110112A: optical upper limit
  81. GRB 110120A: MASTER optical observations
  82. GRB110119A: MITSuME Okayama optical upper limits
  83. GRB 110119A: PAIRITEL NIR Afterglow Detection
  84. GRB 110119A: Swift detection of a burst with an optical detection
  85. GRB 101219B: GROND detection of a SN signature
  86. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  87. Short GRB 110112B : early optical limit by "Pi of the Sky"
  88. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  89. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  90. GRB 101225A: HST observations - no host detected
  91. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  92. GRB 110112A: Swift/UVOT upper limits
  93. GRB 110112A: MASTER optical observations
  94. GRB 110106B: MASTER optical observations
  95. GRB110112A: TNT optical afterglow candidate
  96. GRB 110106B: early optical and near-IR observations
  97. GRB 110107A: Swift/UVOT upper limits
  98. GRB 101219b. Possible radio afterglow detection.
  99. GRB 110106B: MASTER early optical observations
  100. GRB 110107A: Swift-BAT refined analysis

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