Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

5544 results found.

  1. GRB 150323C: Mondy optical observations
  2. GRB 150323B : Xinglong TNT upper limit
  3. GRB 150323C: RATIR Optical Afterglow Observations
  4. GRB 150323C : Xinglong TNT optical observation
  5. GRB 150323C: Xingming upper limit
  6. GRB 150323A: KAIT Optical Observations
  7. GRB 150323C: Nanshan optical afterglow detection
  8. GRB 150323C: MASTER-net optical observation
  9. GRB 150323A: RATIR Optical Afterglow Observations
  10. GRB 150323A: Swift detection of a burst
  11. Swift Triggers 635788-635794 are probably not real.
  12. GRB 150318A: Skynet PROMPT-CTIO Observations
  13. GRB 150317A: RATIR Optical Afterglow Detection
  14. GRB 150220A, the review of the sky area in plate archives
  15. GRB 150314A: NOT further optical observations
  16. GRB 150314A: P60 observations
  17. GRB 150314A: NOT optical observations
  18. GRB 150314A: MITSuME Akeno upper limits
  19. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  20. GRB 150313A: MAXI/GSC detection
  21. GRB 150309A: AAO optic upper limit
  22. GRB 150311A: MAXI/GSC possible afterglow detection
  23. GRB 150309A: CrAO optic upper limit
  24. GRB 150309A: ISON-Kislovodsk optic upper limit
  25. GRB150309A: Optical observations at Crni Vrh
  26. GRB 150309A: MASTER prompt optical observation
  27. GRB 150309A: Swift detection of a burst
  28. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  29. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  30. Swift J0045.2+4151: analysis of XMM-Newton archival data
  31. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  32. GRB 150302A: Mondy optical upper limit
  33. GRB 150302A: MITSuME Okayama upper limits
  34. GRB 150301B: GROND afterglow observations
  35. GRB 150301B: MASTER early OT detection
  36. GRB 150301C : (Swift trigger 633105) Swift observations
  37. GRB 150301A: GROND Observations
  38. GRB 150301A: Fermi GBM observation
  39. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  40. Fermi GBM Observations of Magnetar 4U 0142+61
  41. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  42. IPN Triangulation of GRB 150220A
  43. GRB 150222A: GROND optical afterglow candidate
  44. Trigger 631747: Swift detection of 4U 0614+09
  45. GRB 150212A: Swift-XRT afterglow detection
  46. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  47. GRB 150203A: ISON-NM early optical limit
  48. GRB 150203A: MITSuME Okayama upper limits
  49. GRB 150203A: Fermi GBM observation
  50. GRB 150128A: MASTER OT detction during inspection
  51. GRB 150123A: MASTER inspection
  52. GRB 150126A: MAXI/GSC afterglow candidate detection
  53. GRB 150120B: Swift-BAT refined analysis
  54. GRB 150120A: P60 optical observations
  55. Swift detection of 4U 1700+24 (= V* V934 Her)
  56. GRB 150103A: MASTER optical observations
  57. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  58. GRB 141230A: Fermi GBM detection
  59. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  60. GRB 141225A: MASTER-SAAO OT light curve
  61. GRB 141225A: very early T60 observations
  62. GRB 141225A: MASTER-SAAO first OT detection
  63. Swift detection of 4U 1700+24 (= V934 Her)
  64. GRB 141202A: Swift XRT observations
  65. IPN Triangulation of GRB 141202A (short/hard)
  66. IPN Triangulation of GRB 141121A (initial episode)
  67. GRB 141121A: SPI-ACS/INTEGRAL observations
  68. IPN Triangulation of GRB 141125A (short/hard)
  69. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  70. GRB 141121A: MAXI/GSC detection
  71. GRB141121A: BOOTES-2/TELMA upper limit
  72. GRB 141121A: Swift detection of a burst
  73. IPN Triangulation of GRB 141118A
  74. Swift Trigger 618134 is not an astrophysical event
  75. GRB 141104A: Swift-XRT observations
  76. Konus-Wind observation of GRB 141104A
  77. IPN Triangulation of GRB 141104A (long/very bright)
  78. GRB 141031B: MITSuME Ishigakijima upper limits
  79. GRB 141031B: MASTER early optical observations
  80. GRB 141029B: Fermi GBM detection
  81. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  82. GRB 141026A: SAO RAS Zeiss-1000 observations
  83. GRB141026A: Deep P200 optical imaging
  84. GRB 140930B: GROND observations
  85. Swift detection of outburst from 4U 1700+24
  86. GRB 140909A: Confirmation of the Swift-XRT afterglow
  87. GRB 140907A: Mondy optical observations
  88. GRB 140909A: Swift-XRT observations
  89. GRB 140907A: MASTER optical observations
  90. GRB 140907A : Virtual Telescope optical observations
  91. GRB140907A: Swift UVOT detection
  92. GRB 140907A : Optical observations from Nanshan
  93. GRB 140901B: Swift XRT observation
  94. GRB 140903A: ISON-Kislovodsk observations
  95. GRB 140903A: MAXI/GSC upper limit
  96. GRB140903A: Discovery Channel Telescope Optical Detection
  97. GRB 140829A: iPTF optical observations
  98. GRB 140824B: Swift observations
  99. Swift detection of SAX J1712.6-3739
  100. GRB 140817A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov