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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"

20964 results found.

  1. GRB 120422A: Konkoly optical observations
  2. Fermi Trigger 358364818: BOOTES-4 observations
  3. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  4. GRB 120510A: Swift XRT and UVOT observations
  5. GRB 120510A: MASTER follow up observations
  6. GRB 120510A: MAXI/GSC detection of a burst
  7. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  8. GRB 120422A: P200 NIR detection
  9. GRB 120422A: CARMA 3mm observations
  10. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  11. GRB 120422A: Gemini-N detection of a supernova
  12. GRB 120427A: MASTER follow up observations
  13. GRB 120422A: optical observations
  14. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  15. GRB 120424A: MAXI/GSC detection of a burst
  16. GRB 120422A: 272 GHz observations from SMA
  17. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  18. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  19. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  20. GRB 120422A GROND observations
  21. GRB 120422A: Super-LOTIS early observations
  22. GRB 120422A: EVLA Detection
  23. GRB 120422A: Xinglong TNT optical upper limit
  24. GRB 120422A: NOT optical observations
  25. GRB 120422A: Zadko observatory - Gingin optical observations
  26. GRB 120422A: A Swift/UVOT Detection
  27. GRB 120422A: Gemini observations
  28. GRB 120422A: Faulkes Telescope North observations
  29. GRB 120419A: Swift-XRT and UVOT observations
  30. GRB 120404A: optical observations in Mondy observatory
  31. GRB 120404A: optical observations
  32. GRB 120404A, Optical Observations
  33. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  34. GRB 120404A: SMARTS optical/IR observations
  35. GRB 120404A: MASTER OT observations
  36. GRB120404A: GROND observations show steeply decaying afterglow
  37. GRB120404A: MOA optical observations of the initial rise afterglow
  38. GRB 120404A: VLT/X-shooter redshift confirmation
  39. GRB 120404A: Swift/UVOT Detection
  40. GRB 120404A : TNT optical observation
  41. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  42. GRB 120404A: Gemini-N Redshift correction
  43. GRB 120403B: TAROT La Silla observatory optical observations
  44. GRB 120404A: Gemini-N Redshift
  45. GRB 120403B: AAT nIR observations
  46. GRB 120403B: Swift/UVOT Upper Limits
  47. GRB 120403A: MASTER follow up observations
  48. GRB 120402A: MASTER follow up observations
  49. GRB 120326A: Cima Rest and Bassano Brescia
  50. GRB 120327A: SMARTS optical/IR afterglow observations
  51. GRB 120326A: HCT optical observations
  52. GRB 120326A: EVLA Observations
  53. GRB120327A - ATCA radio afterglow detection at 34GHz
  54. GRB 120326A: Bassano Bresciano Observatory optical observations
  55. Swift trigger 518853: MASTER-ICATE possible OT
  56. GRB 120328B: Fermi-LAT Observations
  57. GRB 120327A: Zadko optical observations
  58. long/intense GRB 120328B: MASTER follow up observations
  59. GRB 120328A: Swift/UVOT Upper Limits
  60. GRB 120326A: Bassano Bresciano Observatory further optical observations
  61. GRB 120327A: NOT optical observations
  62. GRB 120328A: TAROT La Silla observatory optical observations
  63. GRB 120326A: Xinglong TNT further optical observation��correction for GCN Cir 13149)
  64. GRB 120326A: Xinglong TNT further optical observation
  65. Skynet/PROMPT observations of GRB120328A
  66. GRB 120326A: PAIRITEL NIR Observations
  67. GRB 120326A: Bassano Bresciano Observatory optical observations
  68. GRB 120327A: CQUEAN grizY Observation
  69. GRB 120326A: LOAO R-band Observations
  70. GRB 120327A: Swift/UVOT further analysis
  71. GRB 120327A: X-shooter redshift
  72. GRB 120327A: Gemini-South redshift
  73. GRB 120327A: TAROT La Silla observatory optical decay
  74. GRB120326A: TNT optical observation
  75. GRB 120327A: IAC80 I-band observations
  76. GROND observations of GRB 120327A
  77. GRB 120327A: REM NIR and optical observations
  78. Skynet/PROMPT observations of GRB120327A
  79. GRB 120326A: Maisoncelles Observatory optical observations
  80. GRB 120327A: Liverpool Telescope Observations
  81. GRB 120327A: TAROT La Silla observatory optical detection
  82. GRB 120326A: optical observation of GMG
  83. GRB 120326A: T17 optical observations
  84. GRB 120326A: CQUEAN grizY Observation
  85. GRB 120323A: MASTER follow up observations
  86. GRB 120326A: Swift/UVOT Detection
  87. GRB 120326A: Optical observations at Crni Vrh
  88. GRB120326A: IAC80 observations
  89. GRB 120326A: Liverpool Telescope observations
  90. Skynet/Dolomiti Observations of GRB120326A
  91. GRB 120326A: TAROT Calern observatory afterglow optical decay
  92. GRB 120326A: TAROT Calern observatory afterglow optical detection
  93. GRB 120323A: Fermi LAT observations
  94. GRB 120324A: GROND observations
  95. GRB 120324A: CQUEAN rizY Observation
  96. GRB 120324A: Swift/UVOT Upper Limits
  97. GRB 120324A: TAROT La Silla observatory optical observations
  98. GRB 120320A: Zadko optical observations
  99. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  100. GRB 120229A: Magellan observations and limit on an optical afterglow

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