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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"

5546 results found.

  1. GRB 150323B; Konkoly optical observations
  2. GRB 150323A; Konkoly optical observations
  3. GRB 150323C: Mondy optical observations
  4. GRB 150323B : Xinglong TNT upper limit
  5. GRB 150323C: RATIR Optical Afterglow Observations
  6. GRB 150323C : Xinglong TNT optical observation
  7. GRB 150323C: Xingming upper limit
  8. GRB 150323A: KAIT Optical Observations
  9. GRB 150323C: Nanshan optical afterglow detection
  10. GRB 150323C: MASTER-net optical observation
  11. GRB 150323A: RATIR Optical Afterglow Observations
  12. GRB 150323A: Swift detection of a burst
  13. Swift Triggers 635788-635794 are probably not real.
  14. GRB 150318A: Skynet PROMPT-CTIO Observations
  15. GRB 150317A: RATIR Optical Afterglow Detection
  16. GRB 150220A, the review of the sky area in plate archives
  17. GRB 150314A: NOT further optical observations
  18. GRB 150314A: P60 observations
  19. GRB 150314A: NOT optical observations
  20. GRB 150314A: MITSuME Akeno upper limits
  21. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  22. GRB 150313A: MAXI/GSC detection
  23. GRB 150309A: AAO optic upper limit
  24. GRB 150311A: MAXI/GSC possible afterglow detection
  25. GRB 150309A: CrAO optic upper limit
  26. GRB 150309A: ISON-Kislovodsk optic upper limit
  27. GRB150309A: Optical observations at Crni Vrh
  28. GRB 150309A: MASTER prompt optical observation
  29. GRB 150309A: Swift detection of a burst
  30. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  31. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  32. Swift J0045.2+4151: analysis of XMM-Newton archival data
  33. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  34. GRB 150302A: Mondy optical upper limit
  35. GRB 150302A: MITSuME Okayama upper limits
  36. GRB 150301B: GROND afterglow observations
  37. GRB 150301B: MASTER early OT detection
  38. GRB 150301C : (Swift trigger 633105) Swift observations
  39. GRB 150301A: GROND Observations
  40. GRB 150301A: Fermi GBM observation
  41. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  42. Fermi GBM Observations of Magnetar 4U 0142+61
  43. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  44. IPN Triangulation of GRB 150220A
  45. GRB 150222A: GROND optical afterglow candidate
  46. Trigger 631747: Swift detection of 4U 0614+09
  47. GRB 150212A: Swift-XRT afterglow detection
  48. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  49. GRB 150203A: ISON-NM early optical limit
  50. GRB 150203A: MITSuME Okayama upper limits
  51. GRB 150203A: Fermi GBM observation
  52. GRB 150128A: MASTER OT detction during inspection
  53. GRB 150123A: MASTER inspection
  54. GRB 150126A: MAXI/GSC afterglow candidate detection
  55. GRB 150120B: Swift-BAT refined analysis
  56. GRB 150120A: P60 optical observations
  57. Swift detection of 4U 1700+24 (= V* V934 Her)
  58. GRB 150103A: MASTER optical observations
  59. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  60. GRB 141230A: Fermi GBM detection
  61. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  62. GRB 141225A: MASTER-SAAO OT light curve
  63. GRB 141225A: very early T60 observations
  64. GRB 141225A: MASTER-SAAO first OT detection
  65. Swift detection of 4U 1700+24 (= V934 Her)
  66. GRB 141202A: Swift XRT observations
  67. IPN Triangulation of GRB 141202A (short/hard)
  68. IPN Triangulation of GRB 141121A (initial episode)
  69. GRB 141121A: SPI-ACS/INTEGRAL observations
  70. IPN Triangulation of GRB 141125A (short/hard)
  71. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  72. GRB 141121A: MAXI/GSC detection
  73. GRB141121A: BOOTES-2/TELMA upper limit
  74. GRB 141121A: Swift detection of a burst
  75. IPN Triangulation of GRB 141118A
  76. Swift Trigger 618134 is not an astrophysical event
  77. GRB 141104A: Swift-XRT observations
  78. Konus-Wind observation of GRB 141104A
  79. IPN Triangulation of GRB 141104A (long/very bright)
  80. GRB 141031B: MITSuME Ishigakijima upper limits
  81. GRB 141031B: MASTER early optical observations
  82. GRB 141029B: Fermi GBM detection
  83. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  84. GRB 141026A: SAO RAS Zeiss-1000 observations
  85. GRB141026A: Deep P200 optical imaging
  86. GRB 140930B: GROND observations
  87. Swift detection of outburst from 4U 1700+24
  88. GRB 140909A: Confirmation of the Swift-XRT afterglow
  89. GRB 140907A: Mondy optical observations
  90. GRB 140909A: Swift-XRT observations
  91. GRB 140907A: MASTER optical observations
  92. GRB 140907A : Virtual Telescope optical observations
  93. GRB140907A: Swift UVOT detection
  94. GRB 140907A : Optical observations from Nanshan
  95. GRB 140901B: Swift XRT observation
  96. GRB 140903A: ISON-Kislovodsk observations
  97. GRB 140903A: MAXI/GSC upper limit
  98. GRB140903A: Discovery Channel Telescope Optical Detection
  99. GRB 140829A: iPTF optical observations
  100. GRB 140824B: Swift observations

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