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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"

5386 results found.

  1. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  2. GRB 141225A: MASTER-SAAO OT light curve
  3. GRB 141225A: very early T60 observations
  4. GRB 141225A: MASTER-SAAO first OT detection
  5. Swift detection of 4U 1700+24 (= V934 Her)
  6. GRB 141202A: Swift XRT observations
  7. IPN Triangulation of GRB 141202A (short/hard)
  8. IPN Triangulation of GRB 141121A (initial episode)
  9. GRB 141121A: SPI-ACS/INTEGRAL observations
  10. IPN Triangulation of GRB 141125A (short/hard)
  11. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  12. GRB 141121A: MAXI/GSC detection
  13. GRB141121A: BOOTES-2/TELMA upper limit
  14. GRB 141121A: Swift detection of a burst
  15. IPN Triangulation of GRB 141118A
  16. Swift Trigger 618134 is not an astrophysical event
  17. GRB 141104A: Swift-XRT observations
  18. Konus-Wind observation of GRB 141104A
  19. IPN Triangulation of GRB 141104A (long/very bright)
  20. GRB 141031B: MITSuME Ishigakijima upper limits
  21. GRB 141031B: MASTER early optical observations
  22. GRB 141029B: Fermi GBM detection
  23. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  24. GRB 141026A: SAO RAS Zeiss-1000 observations
  25. GRB141026A: Deep P200 optical imaging
  26. GRB 140930B: GROND observations
  27. Swift detection of outburst from 4U 1700+24
  28. GRB 140909A: Confirmation of the Swift-XRT afterglow
  29. GRB 140907A: Mondy optical observations
  30. GRB 140909A: Swift-XRT observations
  31. GRB 140907A: MASTER optical observations
  32. GRB 140907A : Virtual Telescope optical observations
  33. GRB140907A: Swift UVOT detection
  34. GRB 140907A : Optical observations from Nanshan
  35. GRB 140901B: Swift XRT observation
  36. GRB 140903A: ISON-Kislovodsk observations
  37. GRB 140903A: MAXI/GSC upper limit
  38. GRB140903A: Discovery Channel Telescope Optical Detection
  39. GRB 140829A: iPTF optical observations
  40. GRB 140824B: Swift observations
  41. Swift detection of SAX J1712.6-3739
  42. GRB 140817A: Swift detection of a burst
  43. GRB 140814A: Swift-XRT and UVOT observations
  44. GRB 140814A: Swift-XRT and UVOT observations
  45. GRB 140814A: MAXI/GSC detection
  46. GRB140809A: Fermi GBM observation
  47. Swift trigger 609139 is probably 4U 1850-03
  48. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  49. GRB 140730A: Prompt enhanced Swift-XRT position
  50. GRB 140729A: Swift-XRT and UVOT observations
  51. GRB 140723A: LCO-Sutherland optical candidate
  52. Konus-Wind observation of GRB 140721A
  53. IPN Triangulation of GRB 140721A
  54. GRB 140721A: Fermi GBM detection
  55. GRB 140719A: Swift detection of a burst
  56. Swift Trigger 604111 is not a GRB
  57. GRB 140706A: Swift/UVOT Detection
  58. GRB 140706A: Swift-BAT refined analysis
  59. GRB 140703A: AAO optical observations
  60. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  61. GRB 140706A: Enhanced Swift-XRT position
  62. GRB 140706A: Swift detection of a burst with an optical counterpart
  63. GRB 140703A: CARMA 3mm detection
  64. GRB 140703A: P60 observations of a red, slowly-fading afterglow
  65. GRB 140703A: Monte Agliale Observatory optical observations
  66. GRB 140703A: MASTER optical observations
  67. GRB 140629A: SAO RAS monitoring
  68. GRB 140621A: Swift-XRT observations
  69. GRB 140619B: Swift-XRT observations
  70. GRB 140610A: TShAO optical upper limit
  71. Konus-Wind observation of GRB 140611A
  72. IPN Triangulation of GRB 140611A (short/hard)
  73. Konus-Wind observation of GRB 140606B
  74. IPN Triangulation of GRB 140606B
  75. GRB 140606B: Fermi GBM detection
  76. Fermi423717114: iPTF optical transient candidates
  77. GRB 140529A: Swift-XRT afterglow detection.
  78. Konus-Wind observation of GRB 140523A
  79. IPN Triangulation of GRB 140523A
  80. GRB 140523A: Fermi-LAT detection
  81. GRB 140523A: Fermi GBM detection
  82. GRB 140521A: AROMA-N Optical Observation
  83. GRB 140515B: MAXI/GSC detection
  84. GRB 140423A: HCT optical observations
  85. GRB 140508A: Mondy upper limit
  86. GRB140512A : GROND observations
  87. GRB 140509A: Swift/UVOT Detection and photo-z
  88. Konus-Wind observation of GRB 140508A
  89. GRB 140509A: Swift detection of a burst with an optical counterpart
  90. GRB 140508A: iPTF optical transient candidate
  91. IPN triangulation of GRB 140508A
  92. GRB 140508A: Fermi GBM detection
  93. GRB 140501A: Fermi GBM detection
  94. GRB 140430A: VATT Optical Observations
  95. DG CVn: optical observations
  96. GRB 140423A: Nishi-Harima NIR Observations
  97. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  98. GRB 140419A, LOAO R-band observations
  99. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  100. GRB 140423A: optical afterglow candidate

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