Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

5059 results found.

  1. GRO J1744-28: Fermi GBM observation
  2. GRB 140311B: Nanshan afterglow detection
  3. GRB 140311B: MASTER early optical observations
  4. GRB 140311A: Nanshan OT detection
  5. GRB 140311A: MASTER early optical observations
  6. Konus-Wind observation of GRB 140308A
  7. IPN Triangulation of GRB 140308A
  8. GRB 140306A: Suzaku WAM observation of the prompt emission
  9. Konus-Wind observation of GRB 140306A
  10. IPN Triangulation of GRB 140306A
  11. GRB 140304A: Continued RATIR Optical and NIR Observations
  12. GRB 140306A: Fermi GBM detection
  13. GRB 140304A: MASTER OT light curve
  14. GRB 140304A: RATIR g-band Dropout
  15. GRB 140304A: Khureltogot optical observations
  16. GRB 140304A: Mondy optical observations
  17. GRB 140304A: Afterglow decay from Nanshan observations
  18. GRB 140304A: MASTER OT detecton
  19. GRB 140302A: MITSuME Okayama upper limits
  20. GRB 140215A: MITSuME Okayama Optical Observation
  21. GRB140206A: Discovery Channel Telescope Optical Detection
  22. GRB 140211A: Swift detection of a burst
  23. GRB 140129B: MASTER OT early light curve
  24. GRB140129A: RAPTOR Observations of the Early Afterglow
  25. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  26. GRB 140129A: P60 optical afterglow detection
  27. GRB 140129A: Swift detection of a burst with an optical afterglow
  28. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  29. GRB 140118A: Swift detection of a burst
  30. GRB 140103A: optical upper limit
  31. GRB 140114A: NOT afterglow observations
  32. GRB 140103A: AAO optical afterglow candidate
  33. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  34. GRB 140110A: Swift XRT observations
  35. GRB 131231A: AAO optical observations
  36. LOAO R-band Observation of GRB 140102A
  37. GRB 131209A: Further Swift XRT observations
  38. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  39. GRB 140102A: P60 observations
  40. GRB 140102A: GROND observations
  41. GRB 131224B detected in ground analysis of Swift-BAT data
  42. GRB 131231A: P60 observations
  43. GRB 131231A: MDM afterglow observation
  44. GRB 131224A: Swift-XRT observation
  45. Trigger 581129: Swift-BAT triggered on noise
  46. GRB131202A : GROND observations
  47. GRB 131127B: rejection of optical counterpart candidates
  48. GRB 131126A: Fermi GBM observation
  49. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  50. GRB 131202A : XMM-Newton planned observation
  51. Konus-Wind observation of GRB 131126A
  52. IPN Triangulation of GRB 131126A (short/hard)
  53. IPN Triangulation of GRB 131127B
  54. Fermi407254341: iPTF optical afterglow candidates
  55. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  56. GRB 131108A: 1.23m CAHA optical candidate
  57. GRB 131105A: VLT/X-shooter redshift
  58. GRB 131105A: VLT/X-shooter optical afterglow candidate
  59. GRB 131031A: Swift-XRT observations
  60. GRB 131028A: Fermi GBM detection
  61. GRB 131018B: Swift-XRT observations
  62. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  63. GRB 131011A: GROND afterglow observations
  64. GRB 131004A: Swift detection of a burst (may be short)
  65. GRB 131002B: GROND upper limits
  66. GRB 131002A: ISON-NM optical observations
  67. GRB 131002A: Enhanced Swift-XRT position
  68. GRB 131002A: Swift detection of a burst
  69. GRB 131002A: Faulkes Telescope North optical afterglow
  70. GRB 130930A: Swift detection of a burst
  71. Fermi LAT Upper Limits on GRB 130925A
  72. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  73. GRB 130925A: Historical non-detection from Rosat-HRI
  74. Fermi GBM detection of GRB 130925A and a possible precursor
  75. GRB 130925A: MAXI/GSC detection
  76. GRB 130925A: Swift detection of a burst
  77. GRB 130831A: RTT150 optical observations
  78. GRB 130903A: optical observations
  79. GRB 130912A: AAO optical upper limit
  80. GRB 130606A: Chandra observation
  81. GRB 130912A: GROND observations
  82. GRB 130831A: Maidanak optical observations
  83. GRB 130822A: nearby galaxy redshifts
  84. GRB 130903A: MASTER early optical limit
  85. GRB 130903A: Fermi GBM observation
  86. GRB 130903A: GROND Upper Limits
  87. GRB 130816A: Swift/UVOT Upper Limits
  88. GRB 130807A: Swift-XRT refined analysis
  89. GRB 130807A, Swift-BAT refined analysis
  90. GRB 130803A; Fermi GBM observation
  91. GRB 130727A: Faulkes Telescope South optical afterglow
  92. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  93. GRB 130719A: Swift detection of a burst
  94. GRB 130716A: Probable short-hard burst with delayed Swift data
  95. GRB 130708A: Swift XRT and UVOT Observations
  96. GRB 130702A: NOT optical observations
  97. GRB 130702A / Fermi394416326 : Nanshan optical observations
  98. Fermi394416326: FTN detection
  99. Fermi394416326: iPTF detection of a possible optical afterglow
  100. GRB 130627A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive:
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