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"

42849 results found.

  1. GRB 120804A: Swift-BAT refined analysis
  2. GRB 120804A: Swift-XRT refined Analysis
  3. GRB 120804A: GROND upper limits
  4. GRB 120802A: EVLA Observations
  5. GRB 120804A: Enhanced Swift-XRT position
  6. GRB 120804A: Swift detection of a short burst
  7. GRB 120803B: Swift-BAT refined analysis
  8. GRB 120803B: Enhanced Swift-XRT position
  9. GRB 120803A: Swift-XRT Observations
  10. GRB 120803A: Swift-BAT refined analysis
  11. GRB 120803B: FTN possible afterglow candidate
  12. GRB 120803B: Swift detection of a burst
  13. GRB 120803A: Swift detection of a possible burst
  14. GRB 120802A: Swift-XRT refined Analysis
  15. GRB 120802A Gemini-N redshift
  16. GRB 120802A: APEX/LABOCA submm observations
  17. GRB 120729A: Fermi GBM observation
  18. GRB 120802A: Swift-BAT refined analysis
  19. GRB 120802A: Enhanced Swift-XRT position
  20. GRB 120802A: MASTER optical observations
  21. GRB 120802A: optical uper limit in ISON-NM observatory
  22. GRB 120802A: Swift detection of a burst
  23. GRB 120729A: JCMT SCUBA-2 sub-mm observation
  24. GRB 120728B: Fermi GBM detection
  25. Konus-Wind observation of GRB 120728B
  26. GRB 120729A: break in the optical light curve
  27. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  28. IPN Triangulation of GRB 120728B (long/intense)
  29. GRB 120729A: RTT150 optical observations
  30. GRB 120729A: EVLA Observations
  31. Virtual Telescope observations of GRB 120729A
  32. GRB 120729A: Early RAPTOR Observations
  33. GRB 120729A: UKIRT Observation
  34. T100 observations of GRB 120729A
  35. GRB 120728A: GROND Afterglow discovery
  36. GRB 120729A: Swift-XRT refined Analysis
  37. Correction to Swift GCN Circular 13538
  38. GRB 120729A: Swift/UVOT Detection
  39. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  40. GRB 120729A: Xinglong TNT optical upper limit
  41. GRB 120729A, Swift-BAT refined analysis
  42. GRB 120728A, Swift-BAT refined analysis
  43. GRB 120729A: Enhanced Swift-XRT position
  44. GRB 120729A Gemini-N redshift
  45. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  46. GRB 120729A: Swift detection of a burst with an optical afterglow
  47. GRB 120728A: Swift-XRT refined Analysis
  48. GRB 120728A: Enhanced Swift-XRT position
  49. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  50. GRB 120728A: GROND observations
  51. GRB 120728A: Swift detection of a burst
  52. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  53. GRB 120716A: optical observation in Maidanak observatory
  54. Swift Trigger 528925 is probably a noise fluctuation
  55. GRB 120722A: optical upper limit
  56. GRB 120724A: optical observation in Maidanak observatory
  57. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  58. GRB 120716A: optical observation in CrAO
  59. GRB 120724A, Swift-BAT refined analysis
  60. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  61. GRB 120724A: Enhanced Swift-XRT position
  62. GRB 120724A: Swift-XRT refined Analysis
  63. GRB 120724A: Gemini-N tentative redshift
  64. GRB 120724A: FTN optical afterglow candidate
  65. GRB 120724A: Swift detection of a burst
  66. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  67. GRB 120722A: Swift/UVOT Upper Limits
  68. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  69. GRB 120722A: GROND detection of the afterglow
  70. GRB 120722A: 1.5m OSN I-band observations
  71. GRB 120722A: Swift-XRT refined Analysis
  72. GRB 120722A: Swift-BAT refined analysis
  73. GRB 120722A: Enhanced Swift-XRT position
  74. GRB 120722A: Correction for GCN circ.13500
  75. GRB 120722A: Xinglong TNT optical afterglow candidate
  76. GRB 120722A: Swift detection of a burst
  77. GRB 120716A: Fermi GBM observation
  78. GRB 120716A: EVLA Detection
  79. GRB 120716A: Swift-XRT detection
  80. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  81. GRB 120716A: Redshift confirmation from VLT/X-shooter
  82. VLT/FORS2 redshift of GRB120716A
  83. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  84. GRB 120716A: Optical decay from NOT
  85. GRB 120716A: Candidate Optical Afterglow from PTF
  86. Konus-Wind observation of GRB 120716A
  87. IPN Triangulation of unusual GRB 120716A
  88. Fermi GBM trigger 120716.498 is not a GRB
  89. GRB 120711A: ATCA 34GHz final observations (upper limit)
  90. GRB 120714B: Swift-XRT refined Analysis
  91. GRB120714A: Swift/UVOT upper limits
  92. GRB 120714B: Swift-BAT refined analysis
  93. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  94. GRB 120714A: GROND upper limits
  95. GRB 120714B: GROND confirmation of fading afterglow
  96. GRB 120714B: Redshift from VLT/X-shooter
  97. GRB 120714A: Swift-XRT refined Analysis
  98. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  99. GRB 120624B: VLA Observations
  100. GRB 120714B: Position Correction and Candidate Optical Afterglow

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