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"

42481 results found.

  1. GRB 120807A: Fermi/LAT upper limit
  2. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  3. GRB 120807A: TAROT La Silla observatory optical observations
  4. GRB 120807A: Swift-BAT refined analysis
  5. GRB 120807A: Enhanced Swift-XRT position
  6. GRB 120807A: Swift detection of a burst
  7. GRB 120804A: ATCA 34GHz upper limit
  8. Fermi/GBM detection of an SGR-like burst
  9. GRB 120805A: Swift/UVOT Upper Limits
  10. Swift trigger 530214: uncertain if real or not
  11. Swift-BAT trigger 529813 is due to noise while entering the SAA
  12. GRB 120728A: Fermi GBM observation
  13. GRB 120805A: Swift-BAT refined analysis
  14. GRB 120805A: Swift-XRT refined Analysis
  15. GRB 120805A: 1.23m CAHA observations
  16. GRB 120805A: TAROT Calern observatory optical observations
  17. GRB 120805A: Swift detection of a burst
  18. GRB 120804A: EVLA Detection
  19. GRB 120804A: Gemini-North observations
  20. GRB 120804A: MITSuME Okayama Optical upper limits
  21. GRB 120803B: Swift-XRT refined Analysis
  22. GRB 120804A: Swift/UVOT Upper Limits
  23. GRB 120804A: Swift-BAT refined analysis
  24. GRB 120804A: Swift-XRT refined Analysis
  25. GRB 120804A: GROND upper limits
  26. GRB 120802A: EVLA Observations
  27. GRB 120804A: Enhanced Swift-XRT position
  28. Erratum of subject line of GCN13570 (GRB 120803A => GRB 120803B)
  29. GRB 120803B: MITSuME Okayama Optical upper limits
  30. GRB 120803A: MITSuME Okayama Optical upper limits
  31. GRB 120804A: Swift detection of a short burst
  32. GRB 120803B: Swift-BAT refined analysis
  33. GRB 120803B: Enhanced Swift-XRT position
  34. GRB 120803B: MITSuME Akeno Optical upper limits
  35. GRB 120803A: Swift-XRT Observations
  36. GRB 120803A: Swift-BAT refined analysis
  37. GRB 120803B: FTN possible afterglow candidate
  38. GRB 120803B: Swift detection of a burst
  39. GRB 120803A: Swift detection of a possible burst
  40. GRB 120802A: GRT Optical Observation
  41. GRB 120802A: Swift-XRT refined Analysis
  42. GRB 120802A Gemini-N redshift
  43. GRB 120802A: APEX/LABOCA submm observations
  44. GRB 120729A: Fermi GBM observation
  45. GRB 120802A: Swift-BAT refined analysis
  46. GRB 120802A: Enhanced Swift-XRT position
  47. GRB 120802A: MASTER optical observations
  48. GRB 120802A: optical uper limit in ISON-NM observatory
  49. GRB 120802A: Swift detection of a burst
  50. GRB 120729A: JCMT SCUBA-2 sub-mm observation
  51. GRB 120728B: Fermi GBM detection
  52. Konus-Wind observation of GRB 120728B
  53. GRB 120729A: break in the optical light curve
  54. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  55. GRB 120729A: RTT150 optical observations
  56. GRB 120729A: EVLA Observations
  57. Virtual Telescope observations of GRB 120729A
  58. GRB 120729A: Early RAPTOR Observations
  59. T100 observations of GRB 120729A
  60. GRB 120728A: GROND Afterglow discovery
  61. GRB 120729A: Swift-XRT refined Analysis
  62. Correction to Swift GCN Circular 13538
  63. GRB 120729A: Swift/UVOT Detection
  64. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  65. GRB 120729A: Xinglong TNT optical upper limit
  66. GRB 120729A, Swift-BAT refined analysis
  67. GRB 120728A, Swift-BAT refined analysis
  68. GRB 120729A: Enhanced Swift-XRT position
  69. GRB 120728A: Swift/UVOT Upper Limits
  70. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  71. GRB 120729A: Swift detection of a burst with an optical afterglow
  72. GRB 120728A: Swift-XRT refined Analysis
  73. GRB 120728A: Enhanced Swift-XRT position
  74. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  75. GRB 120728A: GROND observations
  76. GRB 120728A: Swift detection of a burst
  77. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  78. GRB 120716A: optical observation in Maidanak observatory
  79. Swift Trigger 528925 is probably a noise fluctuation
  80. GRB 120722A: optical upper limit
  81. GRB 120724A: optical observation in Maidanak observatory
  82. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  83. GRB 120716A: optical observation in CrAO
  84. GRB 120724A, Swift-BAT refined analysis
  85. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  86. GRB 120724A: Enhanced Swift-XRT position
  87. GRB 120724A: Swift-XRT refined Analysis
  88. GRB120711A: Planned XMM-Newton observation
  89. GRB 120724A: FTN optical afterglow candidate
  90. GRB 120724A: Swift detection of a burst
  91. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  92. GRB 120722A: Swift/UVOT Upper Limits
  93. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  94. GRB 120722A: GROND detection of the afterglow
  95. GRB 120722A: 1.5m OSN I-band observations
  96. GRB 120722A: Swift-XRT refined Analysis
  97. GRB 120722A: Swift-BAT refined analysis
  98. GRB 120722A: Enhanced Swift-XRT position
  99. GRB 120722A: Correction for GCN circ.13500
  100. GRB 120722A: Xinglong TNT optical afterglow candidate

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