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"

32689 results found.

  1. GRB 090518: P60 Observations
  2. GRB 090518, Swift-BAT refined analysis
  3. GRB 090516, RIMOTS optical upper limits
  4. GRB090518 : Optical upper limit by MOA-II telescope
  5. GRB 090518: Swift-XRT refined analysis
  6. GRB 090515: Swift/BAT spectral lag results
  7. GRB 090516: Swift-BAT refined analysis
  8. GRB 090516: VLT spectrum (correction & update)
  9. GRB 090516: GROND OBSERVATIONS
  10. GRB 090516: VLT redshift
  11. GRB 090516 - Zadko Telescope observations
  12. GRB 090516: NOT optical observations
  13. GRB 090516: Swift XRT refined analysis
  14. GRB 090516: Swift/UVOT Observations
  15. GRB 090516: Faulkes Telescope South optical afterglow
  16. GRB 090515: Lick Upper Limits
  17. GRB 090515: ROVOR Upper Limit
  18. GRB 090515: MMT/MMIRS NIR Upper Limit
  19. GRB 090515: Swift/UVOT Observations
  20. GRB 090515: Swift-XRT refined analysis
  21. GRB 090509: Fermi GBM observation
  22. GRB 090515: Swift-BAT refined spectral analysis
  23. GRB 090515: Swift-BAT refined analysis
  24. GRB 090509 - Zadko Telescope observations
  25. GRB 090515: Gemini-N upper limit
  26. GRB 090515: WIYN NIR Upper Limit
  27. GRB 090515: Super-LOTIS Upper Limits
  28. GRB 090515: PAIRITEL Upper Limits
  29. GRB 090515: KAIT optical upper limits
  30. GRB 090515: ROTSE-III Optical Limits
  31. GRB 090510: Suzaku WAM observation of the prompt emission
  32. GRB 090510, Radio limits
  33. GRB090510: VLT/FORS2 spectroscopic redshift
  34. GRB 090510: GROND observations
  35. GRB 090510: Swift/UVOT host galaxy candidates
  36. GRB 090510: Fermi-LAT follow-up analysis
  37. GRB 090509, further Swift-BAT refined analysis
  38. GRB 090510: correction to GCN 9344
  39. Konus-Wind observation of GRB 090510
  40. AGILE detection of GRB 090510
  41. GRB 090510: UVOT refined analysis
  42. GRB 090510: Swift XRT refined analysis
  43. GRB 090510: correction to coordinates in GCN 9338
  44. GRB 090510: NOT afterglow confirmation
  45. GRB 090510: Swift-BAT refined analysis
  46. GRB 090510: Fermi GBM detection
  47. GRB 090509: Swift-BAT refined analysis
  48. GRB 090509, SMARTS optical/IR afterglow observations
  49. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  50. GRB 090408: optical upper limit
  51. GRB 090418A: optical observation
  52. GRB 090509: GROND further analysis and redshift limit
  53. GRB 090509: REM NIR afterglow
  54. GRB 090509: GROND afterglow candidate
  55. GRB 090323: optical observations
  56. GRB 090423: optical limit
  57. GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
  58. GRB 080913: 250 GHz upper limit for a z=6.7 GRB with MAMBO-2 at the IRAM 30m
  59. GRB 090424: optical observations
  60. GRB 090427: GROND observations
  61. GRB 090429A: ROVOR magnitude limit
  62. ICSP VLF observation of GRB090427 from two receivers
  63. ICSP VLF observation of GRB090424 from four receivers
  64. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  65. GRB 090428B: Suzaku WAM observation of the prompt emission
  66. GRB 090424, SMARTS optical/IR afterglow monitoring
  67. GRB 090426: optical observations
  68. GRB 090429B: Swift/UVOT Upper Limits
  69. GRB 090429A: Swift/UVOT Upper Limits
  70. GRB 090429B: Gemini-N further nIR observations
  71. GRB 090424: YNAO-GMG observations
  72. GRB 090429A: Swift-XRT refined analysis
  73. GRB 090429A: GROND upper limits
  74. GRB 090429B: Swift XRT refined analysis
  75. Konus-Wind observation of very bright GRB 090427
  76. GRB 090418A BVRcIc field calibration
  77. GRB 090426: GAO 150cm telescope Optical Observation
  78. GRB 090429B: RIMOTS optical upper limits
  79. GRB 090429B: Swift-BAT refined analysis
  80. GRB 090429A: Swift-BAT refined analysis
  81. GRB 090429A - Correction to XRT position
  82. GRB090429B: Gemini-N infrared IR candidate
  83. GRB 090426: YNAO-GMG observations
  84. GRB 090429B: VLT upper limits
  85. GRB 090429B: GROND Observations
  86. GRB 090429B: Super-LOTIS early observations
  87. GRB 090429: Swift detection of a burst
  88. GRB 090423: pseudo burst at z=1 and its relation to GRB 080913
  89. GRB 090424 : Multiband Optical observation from Nainital
  90. GRB 090426: R-band limit
  91. GRB 090424: Continued R-band monitoring
  92. GRB 090423: CARMA mm observations
  93. GRB 090426: Swift/BAT spectral lag results
  94. GRB 090424: Suzaku WAM observation of the prompt emission
  95. GRB 090426: VLT spectroscopy
  96. GRB 090426: GROND Observations of the Optical/NIR Afterglow
  97. GRB 090426: Near infrared observation with ISLE at OAO
  98. GRB 090426: Okayama MITSuME optical observation
  99. GRB090426 Swift/UVOT observations
  100. GRB 090426 Keck LRIS redshift

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