Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

16153 results found.

  1. GRB 151118A: MITSuME Akeno optical upper limits
  2. GRB 151118A: AAO optical upper limit
  3. GRB 151120A: GROND optical/NIR afterglow
  4. GRB 151118A: Early optical limit from pt5m, La Palma
  5. GRB 151118A: ISON-NM early optical limit
  6. GRB 151027A: SAO RAS and Mt. Terskol observations
  7. GRB 151118A: Swift/UVOT Upper Limits
  8. GRB GRB 151118A: MASTER-NET optical observations
  9. GRB 151118A: Optical observations from OSN
  10. GRB151027A; Optical observations
  11. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  12. GRB 151114A: LCOGT-FTS afterglow observations
  13. GRB 151114A: Swift detection of a burst with an optical counterpart
  14. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  15. GRB 151112A: Swift/UVOT Upper Limits
  16. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  17. GRB 151112A: MASTER-NET optical limit
  18. GRB 151111A: Swift/UVOT upper limits
  19. GRB 151111A: LCOGT-FTS afterglow observations
  20. IPN triangulation of GRB151107B
  21. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  22. GRB 151027A: continued Mondy optical observations
  23. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  24. LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
  25. GRB 151027A: Hankasalmi optical observations
  26. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  27. GRB 151107A: MASTER-NET optical observations
  28. LIGO/Virgo G194575: INAF-Asiago Telescope follow-up of iPTF candidates
  29. GRB 151027A: Mondy optical observations
  30. GRB 151027A: Mt. Terskol observatory optical observation
  31. GRB 150910A: CrAO optical observations
  32. GRB 151029A: FRAM optical afterglow detection
  33. GRB 151027A: Correction to GCN 18519
  34. GRB 151031A: MITSuME Akeno optical upper limits
  35. GRB 151027B: ATCA radio detection
  36. GRB 151031A
  37. GRB 151027B: RATIR Late-Time Upper Limits
  38. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  39. GRB 151027A: optical follow-up observations
  40. GRB 151027A: Continued P60 Monitoring
  41. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  42. GRB 151029A: MITSuME Ishigakijima upper limits
  43. GRB 151027A: Optical counterpart detection
  44. GRB 151029A: LCOGT-FTS afterglow observations
  45. GRB 151027B: Swift UVOT detection
  46. GRB 151029A VLT/X-shooter redshift
  47. GRB 151029A: Swift detection of a burst with an optical counterpart
  48. GRB 151027A: SAO RAS optical observations
  49. GRB 151027B: LCOGT FTN afterglow observations
  50. GRB 151027A: NOT optical and NIR observations
  51. GRB 151027B: Swift/UVOT Upper Limits
  52. GRB 151027A : Xinglong TNT optical observation
  53. GRB 151027A: continued GMG observation
  54. GRB 151027B: MASTER-NET early OT detection
  55. GRB 151027A: LCOGT-McDonald afterglow observations
  56. GRB 151027A: VLA detection
  57. GRB 151027B: GROND Optical/NIR Afterglow Detection
  58. GRB 151027B: VLT/X-shooter redshift
  59. GRB 151027A: THO optical observations
  60. GRB 151027B: NOT optical afterglow candidate
  61. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  62. GRB 151027A: Early RAPTOR Observations
  63. LIGO/Virgo G194575: MASTER Optical Inspection
  64. GRB 151027A: GMG observation
  65. GRB 151027A: MITSuME Akeno Optical observation
  66. LIGO/Virgo G194575: Swift observations of LSQ15bjb
  67. LIGO/Virgo G194575: INAF-TNG spectra of LSQ15bjb
  68. GRB 151027A: Keck/HIRES redshift
  69. LIGO/Virgo G194575: GROND multi-color observations
  70. GRB 151027A: Weihai optical observations
  71. GRB 151027A : ISON-NM early optical detection
  72. GRB 151027A: KAIT optical afterglow confirmation
  73. GRB 151027A: Swift detection of a burst with a bright optical afterglow
  74. LIGO/Virgo G194575: INAF-TNG follow-up of LSQ15bjb
  75. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  76. LIGO/Virgo G194575: Kanata/J-GEM optical follow-up
  77. GRB 151022A: OSN optical upper limit
  78. GRB 151023A: Swift/UVOT Upper Limits
  79. GRB 151022A: Swift/UVOT Upper Limits
  80. GRB 151022A: MITSuME Okayama upper limits
  81. LIGO/Virgo G194575: Mini-MegaTORTORA observations
  82. GRB 151022A: Mondy optical upper limit
  83. GRB 151022A: Kanata/HOWPol optical observation
  84. GRB 151022A: MASTER-Ural observations
  85. GRB 151021A: MITSuME Okayama upper limits
  86. GRB 151021A: MASTER-NET bright OT detection
  87. GRB 151021A: Optical counterpart and redshift from X-shooter
  88. LIGO/VIRGO G184098 : PESSTO classifications of PanSTARRS transients in the northern region
  89. GRB 151006A: Mondy optical upper limit
  90. GRB 151006A: MITSuME Akeno optical upper limits
  91. GRB 151006A: OSN optical upper limit
  92. GRB 151006A: Swift/UVOT Upper Limits
  93. GRB 151006A: MITSuME Okayama upper limits
  94. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  95. LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients
  96. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  97. Swift Trigger 657564: MASTER-NET early optical observations.
  98. GRB 151001B: Swift/UVOT Upper Limits
  99. GRB 151001B: MASTER-NET early optical observations.
  100. GRB 151001A: NOT imaging

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