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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"

14950 results found.

  1. Konus-Wind observation of GRB 120624B
  2. GRB 120624B: Swift detection of a burst
  3. GRB 120624B: Fermi-LAT Detection
  4. GRB 120624B: Fermi GBM detection
  5. GRB 120622A: MAXI/GSC detection
  6. Trigger 524584: Swift detection of Algol
  7. Swift triggers (#524542) on a Galactic source
  8. GRB 120614A: MAXI/GSC detection of a burst
  9. GRB 120612A: Swift detection of a burst
  10. Konus-Wind observation of GRB 120603A
  11. Konus-Wind observation of GRB 120528B
  12. GRB 120528C: MAXI/GSC detection
  13. GRB 120521C redshift estimate
  14. GRB 120528B: MAXI/GSC detection
  15. GRB 120521C: EVLA 22 GHz Detection
  16. GRB120521B: SSO 2.3m upper limits
  17. GRB 120521C: Early Tautenburg limits
  18. GRB 120521C: Swift detection of a burst
  19. GRB 120521B: Swift detection of a burst
  20. GRB 120521A: Swift detection of a short burst
  21. GRB 120512A: A long GRB detected by INTEGRAL
  22. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  23. GRB 120514A: UKIRT IR observations
  24. GRB 120514A: Swift detection of a burst
  25. Fermi Trigger 358364818: BOOTES-4 observations
  26. GRB 120510A: MAXI/GSC detection of a burst
  27. GRB 120422A: SN identification from GTC
  28. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  29. GRB 120422A: P200 NIR detection
  30. GRB 120422A: Gemini-N detection of a supernova
  31. GRB 120422A: i-band re-brightening and possible SN detection
  32. Swift detection of 4U 1630-47
  33. Swift Trigger 520928 is probably not a burst
  34. GRB 120424A: MAXI/GSC detection of a burst
  35. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  36. GRB 120422A: EVLA Detection
  37. GRB 120422A: A Swift/UVOT Detection
  38. GRB 120422A: Swift detection of a burst
  39. Swift Trigger 519874 is probably a noise event
  40. Trigger 519868: Swift detection of SGR1806-20
  41. GRB 120404A: optical observations
  42. GRB 120404A: EVLA Detection
  43. GRB 120404A: Swift/UVOT Detection
  44. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  45. GRB 120404A: Swift detection of a burst with an optical counterpart
  46. GRB 120403B: Swift detection of a burst
  47. GRB 120402B: Fermi GBM detection
  48. GRB 120328B: Pi of the Sky simultaneous upper limits
  49. GRB 120403A: Swift detection of a burst
  50. GRB 120402A: Swift detection of a possible burst or noise
  51. GRB 120401A: Swift detection of a burst
  52. GRB120327A - ATCA radio afterglow detection at 34GHz
  53. GRB 120326A: CARMA 3mm detection
  54. Trigger 518853: Swift detection of a probable Galactic transient
  55. GRB 120328B: Fermi GBM detection
  56. long/intense GRB 120328B: MASTER follow up observations
  57. GRB 120328A: Swift detection of a burst
  58. GRB 120327A: GTC redshift confirmation
  59. GRB 120327A afterglow detection
  60. GRB 120327A: Swift/UVOT further analysis
  61. GRB 120327A: TAROT La Silla observatory optical detection
  62. GRB 120327A: Swift detection of a burst with an optical counterpart
  63. GRB 120326A: GTC redshift
  64. GRB 120326A: Swift/UVOT Detection
  65. GRB 120326A: Optical observations at Crni Vrh
  66. GRB 120326A: TAROT Calern observatory afterglow optical decay
  67. GRB 120326A: TAROT Calern observatory afterglow optical detection
  68. GRB 120326A: Swift detection of a burst
  69. Konus-Wind observation of GRB 120323A
  70. GRB 120323A: Fermi GBM detection
  71. GRB 120324A: Swift detection of a burst
  72. GRB 120316A : Suzaku WAM observation of the prompt emission
  73. Konus-Wind observation of GRB 120316A
  74. GRB 120320A: Swift detection of a burst
  75. GRB 111228A: possible detection of the SN with the TNG
  76. Trigger 517876 is a Swift detection of GX 5-1
  77. GRB 120311A: VLT/X-shooter observations
  78. GRB 120312A: Swift detection of a burst
  79. GRB 120311B: Swift detection of a burst
  80. GRB 120311A: Liverpool Telescope optical candidate
  81. GRB 120311A: Swift detection of a burst
  82. GRB 120308A: Swift/UVOT Detection
  83. GRB 120308A: Liverpool Telescope optical afterglow candidate
  84. GRB 120308A: Swift detection of a burst
  85. GRB 120305A: Swift detection of a short burst
  86. GRB 120302A: GROND detection of an afterglow candidate
  87. GRB 120229A: Swift detection of a short burst
  88. Konus-Wind observation of GRB 120226A
  89. GRB 120226A: Fermi-LAT data analysis
  90. GRB 120224A: VLT/X-shooter observations
  91. GRB 120226A: Fermi-LAT detection of a burst
  92. GRB 120224A: GROND detection of the afterglow candidate
  93. GRB 120224A: Swift detection of a burst
  94. GRB 120219A: Swift detection of a burst
  95. GRB 120218A: Swift detection of a burst
  96. Fermi GBM detection of an SGR-like burst
  97. GRB 120215A: Swift detection of a burst
  98. GRB 120212A: GMG optical observation
  99. GRB 120213A: Swift detection of a burst
  100. GRB 120212A: Swift/UVOT Detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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