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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"

20458 results found.

  1. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  2. GRB 120422A: P200 NIR detection
  3. GRB 120422A: CARMA 3mm observations
  4. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  5. GRB 120422A: Gemini-N detection of a supernova
  6. GRB 120427A: MASTER follow up observations
  7. GRB 120422A: optical observations
  8. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  9. GRB 120424A: MAXI/GSC detection of a burst
  10. GRB 120422A: 272 GHz observations from SMA
  11. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  12. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  13. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  14. GRB 120422A GROND observations
  15. GRB 120422A: Super-LOTIS early observations
  16. GRB 120422A: EVLA Detection
  17. GRB 120422A: Xinglong TNT optical upper limit
  18. GRB 120422A: NOT optical observations
  19. GRB 120422A: Zadko observatory - Gingin optical observations
  20. GRB 120422A: A Swift/UVOT Detection
  21. GRB 120422A: Gemini observations
  22. GRB 120422A: Faulkes Telescope North observations
  23. GRB 120419A: Swift-XRT and UVOT observations
  24. GRB 120404A: optical observations in Mondy observatory
  25. GRB 120404A: optical observations
  26. GRB 120404A, Optical Observations
  27. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  28. GRB 120404A: SMARTS optical/IR observations
  29. GRB 120404A: MASTER OT observations
  30. GRB120404A: GROND observations show steeply decaying afterglow
  31. GRB120404A: MOA optical observations of the initial rise afterglow
  32. GRB 120404A: VLT/X-shooter redshift confirmation
  33. GRB 120404A: Swift/UVOT Detection
  34. GRB 120404A : TNT optical observation
  35. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  36. GRB 120404A: Gemini-N Redshift correction
  37. GRB 120403B: TAROT La Silla observatory optical observations
  38. GRB 120404A: Gemini-N Redshift
  39. GRB 120403B: AAT nIR observations
  40. GRB 120403B: Swift/UVOT Upper Limits
  41. GRB 120403A: MASTER follow up observations
  42. GRB 120402A: MASTER follow up observations
  43. GRB 120326A: Cima Rest and Bassano Brescia
  44. GRB 120327A: SMARTS optical/IR afterglow observations
  45. GRB 120326A: HCT optical observations
  46. GRB 120326A: EVLA Observations
  47. GRB120327A - ATCA radio afterglow detection at 34GHz
  48. GRB 120326A: Bassano Bresciano Observatory optical observations
  49. Swift trigger 518853: MASTER-ICATE possible OT
  50. GRB 120328B: Fermi-LAT Observations
  51. GRB 120327A: Zadko optical observations
  52. long/intense GRB 120328B: MASTER follow up observations
  53. GRB 120328A: Swift/UVOT Upper Limits
  54. GRB 120326A: Bassano Bresciano Observatory further optical observations
  55. GRB 120327A: NOT optical observations
  56. GRB 120328A: TAROT La Silla observatory optical observations
  57. GRB 120326A: Xinglong TNT further optical observation��correction for GCN Cir 13149)
  58. GRB 120326A: Xinglong TNT further optical observation
  59. Skynet/PROMPT observations of GRB120328A
  60. GRB 120326A: PAIRITEL NIR Observations
  61. GRB 120326A: Bassano Bresciano Observatory optical observations
  62. GRB 120327A: CQUEAN grizY Observation
  63. GRB 120326A: LOAO R-band Observations
  64. GRB 120327A: Swift/UVOT further analysis
  65. GRB 120327A: X-shooter redshift
  66. GRB 120327A: Gemini-South redshift
  67. GRB 120327A: TAROT La Silla observatory optical decay
  68. GRB120326A: TNT optical observation
  69. GRB 120327A: IAC80 I-band observations
  70. GROND observations of GRB 120327A
  71. GRB 120327A: REM NIR and optical observations
  72. Skynet/PROMPT observations of GRB120327A
  73. GRB 120326A: Maisoncelles Observatory optical observations
  74. GRB 120327A: Liverpool Telescope Observations
  75. GRB 120327A: TAROT La Silla observatory optical detection
  76. GRB 120326A: optical observation of GMG
  77. GRB 120326A: T17 optical observations
  78. GRB 120326A: CQUEAN grizY Observation
  79. GRB 120323A: MASTER follow up observations
  80. GRB 120326A: Swift/UVOT Detection
  81. GRB 120326A: Optical observations at Crni Vrh
  82. GRB120326A: IAC80 observations
  83. GRB 120326A: Liverpool Telescope observations
  84. Skynet/Dolomiti Observations of GRB120326A
  85. GRB 120326A: TAROT Calern observatory afterglow optical decay
  86. GRB 120326A: TAROT Calern observatory afterglow optical detection
  87. GRB 120323A: Fermi LAT observations
  88. GRB 120324A: GROND observations
  89. GRB 120324A: CQUEAN rizY Observation
  90. GRB 120324A: Swift/UVOT Upper Limits
  91. GRB 120324A: TAROT La Silla observatory optical observations
  92. GRB 120320A: Zadko optical observations
  93. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  94. GRB 120229A: Magellan observations and limit on an optical afterglow
  95. GRB 120320A: Swift/UVOT Upper Limits
  96. GRB 120320A , optical observations
  97. GRB 120320A: Gemini-N and UKIRT observations
  98. GRB 120320A: MASTER optical observations
  99. GRB 111228A: possible detection of the SN with the TNG
  100. GRB 120302A: Swift XRT refined analysis

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