Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

5401 results found.

  1. GRB140512A : GROND observations
  2. GRB 140509A: Swift/UVOT Detection and photo-z
  3. Konus-Wind observation of GRB 140508A
  4. GRB 140509A: Swift detection of a burst with an optical counterpart
  5. GRB 140508A: iPTF optical transient candidate
  6. IPN triangulation of GRB 140508A
  7. GRB 140508A: Fermi GBM detection
  8. GRB 140501A: Fermi GBM detection
  9. GRB 140430A: VATT Optical Observations
  10. DG CVn: optical observations
  11. GRB 140423A: Nishi-Harima NIR Observations
  12. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  13. GRB 140419A, LOAO R-band observations
  14. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  15. GRB 140423A: optical afterglow candidate
  16. GRB 140419A: MITSuME Okayama Optical Observation
  17. GRB 140408A: MITSuME Akeno Optical observation
  18. GRB 140406A: Fermi GBM observation
  19. GRB 140402A: Swift-XRT observations
  20. GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
  21. GRB 140331A: MITSuME Okayama upper limits
  22. GRB 140331A: RATIR Optical and NIR Observations
  23. GRB 140320D: MASTER optical observations
  24. GRB 140329A: Fermi GBM observation of a bright burst
  25. GRB 140320C: Mondy optical observations and afterglow confirmation
  26. GRB 140320A: RATIR Optical and NIR Observations
  27. GRB 140320B: P60 detection of a very red afterglow
  28. GRB 140320C: MASTER optical observations
  29. GRB 140318A: Continued RATIR Optical and NIR Observations
  30. GRB 140318A: Mondy optical limit
  31. GRB 140311B: Mondy optical limit
  32. GRB 140311A: Mondy optical limits
  33. GRB 140318A: RATIR Optical and NIR Detections
  34. GRB140318A: Discovery Channel Telescope Optical Detection
  35. GRB140308A: Suzaku WAM observation of the prompt emission
  36. GRB 140311C: Swift-XRT and UVOT observations
  37. GRB 140311C: MASTER before, during and after trigger optical observations
  38. GRB 140311A: RATIR Optical and NIR Detection
  39. GRB 140311A: Montarrenti Observatory optical upper limit
  40. GRB 140311A: Kottamia I-band observation
  41. Fermi416242156: possible iPTF counterpart
  42. GRB 140311B: RATIR Optical and NIR Observations
  43. GRO J1744-28: Fermi GBM observation
  44. GRB 140311B: Nanshan afterglow detection
  45. GRB 140311B: MASTER early optical observations
  46. GRB 140311A: Nanshan OT detection
  47. GRB 140311A: MASTER early optical observations
  48. Konus-Wind observation of GRB 140308A
  49. IPN Triangulation of GRB 140308A
  50. GRB 140306A: Suzaku WAM observation of the prompt emission
  51. Konus-Wind observation of GRB 140306A
  52. IPN Triangulation of GRB 140306A
  53. GRB 140304A: Continued RATIR Optical and NIR Observations
  54. GRB 140306A: Fermi GBM detection
  55. GRB 140304A: MASTER OT light curve
  56. GRB 140304A: RATIR g-band Dropout
  57. GRB 140304A: Khureltogot optical observations
  58. GRB 140304A: Mondy optical observations
  59. GRB 140304A: Afterglow decay from Nanshan observations
  60. GRB 140304A: MASTER OT detecton
  61. GRB 140302A: MITSuME Okayama upper limits
  62. GRB 140215A: MITSuME Okayama Optical Observation
  63. GRB140206A: Discovery Channel Telescope Optical Detection
  64. GRB 140211A: Swift detection of a burst
  65. GRB 140129B: MASTER OT early light curve
  66. GRB140129A: RAPTOR Observations of the Early Afterglow
  67. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  68. GRB 140129A: P60 optical afterglow detection
  69. GRB 140129A: Swift detection of a burst with an optical afterglow
  70. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  71. GRB 140118A: Swift detection of a burst
  72. GRB 140103A: optical upper limit
  73. GRB 140114A: NOT afterglow observations
  74. GRB 140103A: AAO optical afterglow candidate
  75. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  76. GRB 140110A: Swift XRT observations
  77. GRB 131231A: AAO optical observations
  78. LOAO R-band Observation of GRB 140102A
  79. GRB 131209A: Further Swift XRT observations
  80. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  81. GRB 140102A: P60 observations
  82. GRB 140102A: GROND observations
  83. GRB 131224B detected in ground analysis of Swift-BAT data
  84. GRB 131231A: P60 observations
  85. GRB 131231A: MDM afterglow observation
  86. GRB 131224A: Swift-XRT observation
  87. Trigger 581129: Swift-BAT triggered on noise
  88. GRB131202A : GROND observations
  89. GRB 131127B: rejection of optical counterpart candidates
  90. GRB 131126A: Fermi GBM observation
  91. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  92. GRB 131202A : XMM-Newton planned observation
  93. Konus-Wind observation of GRB 131126A
  94. IPN Triangulation of GRB 131126A (short/hard)
  95. IPN Triangulation of GRB 131127B
  96. Fermi407254341: iPTF optical afterglow candidates
  97. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  98. GRB 131108A: 1.23m CAHA optical candidate
  99. GRB 131105A: VLT/X-shooter redshift
  100. GRB 131105A: VLT/X-shooter optical afterglow candidate

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