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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"

5546 results found.

  1. GRB 160310A: Terskol 2-m observations
  2. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  3. GRB 160314A: Continued RATIR Optical and NIR Observations
  4. GRB 160313A: Mondy optical upper limit
  5. GRB 160314A: GROND optical/NIR observations
  6. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  7. GRB 160314A: RATIR Optical and NIR Observations
  8. GRB 160314A: Mondy optical observations
  9. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  10. GRB 160314A: ISON-Ussuriysk optical upper limit
  11. GRB 160314A: Weihai optical upper limit
  12. GRB 160314A: Swift detection of a burst
  13. GRB 160313A: MASTER-Net optical observations
  14. GRB 160313A: RATIR Optical and NIR Observations
  15. GRB 160310A: MASTER-Kislovods observations
  16. GRB 160310A: Further NOT observations
  17. GRB 160310A: RATIR Optical and NIR Observations
  18. GRB 160310A: NOT optical observations
  19. GRB 160310A: LCOGT-SAAO optical upper limits
  20. LIGO/Virgo G211117: HAWC follow-up of northern sky
  21. GRB 160303A: X-shooter spectroscopy
  22. GRB 160303A: JCMT SCUBA-2 sub-mm observation
  23. GRB160303A: further GROND observations
  24. GRB 160303A: Continued RATIR Optical and NIR Observations
  25. GRB 160303A: GROND Optical Detection
  26. GRB 160303A: VLT/FORS2 afterglow obervations
  27. GRB 160303A: McDonald 2.1m CQUEAN Detection
  28. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  29. GRB 160303A: MITSuME Akeno optical upper limits
  30. GRB 160303A: LCOGT-FTN optical observations
  31. GRB 160303A: MITSuME Okayama upper limits
  32. GRB 160303A: ISON-NM early optical early limits
  33. GRB 160227A: McDonald 0.8m Detection
  34. GRB 160227A: MASTER prompt OT Detection and LC
  35. GRB 160227A: MASTER OT Detection
  36. Fermi GBM trigger 477460274/160218161 is not a GRB
  37. GRB 160223A: GROND optical/NIR afterglow
  38. LIGO/Virgo G211117: LOFAR follow-up
  39. GRB 160203A: MITSuME Akeno optical upper limits
  40. GRB 160203A: TSHAO optical observations
  41. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  42. The bright GRB160203A: X-shooter spectroscopy and redshift
  43. GRB 160203A: LCOGT-Cerro Tololo optical afterglow confirmation
  44. GRB 160203A: GROND Afterglow Candidate
  45. GRB 160131A: RATIR Optical Observations
  46. GRB 160131A: LCOGT-FTN optical afterglow observations
  47. GRB 160127A: VLA Detection
  48. GRB 160127A: Swift/UVOT Detection
  49. GRB 160127A: Swift detection of a burst with an optical counterpart
  50. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  51. LIGO/Virgo G184098: MASTER final result
  52. GRB 160117B: Early iTelescope observation
  53. GRB 160119A: Swift detection of a burst
  54. GRB 160117B: VLT/X-shooter spectroscopy
  55. LIGO/Virgo G211117: Preliminary VLA observation summary of PS15dpn
  56. IPN Triangulation of GRB 160113A
  57. LIGO/Virgo G211117: Further Swift-XRT sources
  58. LIGO/Virgo G211117: Swift observations of PS15dpn
  59. LIGO/Virgo G211117: VISTA imaging
  60. GRB 160104A: Continued MITSuME Akeno Optical Observation
  61. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  62. GRB 160107A: MAXI/GSC detection
  63. IPN Triangulation of GRB 151225A (short/hard)
  64. LIGO/Virgo G211117: Further Swift-XRT sources
  65. LIGO/Virgo G211117: Liverpool Telescope classification of EM candidates
  66. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  67. GRB 160104B: MAXI/GSC detection
  68. LIGO/Virgo G211117: LOFAR follow-up
  69. LIGO/Virgo G211117: PESSTO classification of Pan-STARRS transients
  70. LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT
  71. GRB 160102A: MAXI/GSC detection
  72. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  73. LIGO/Virgo G211117: MAXI/GSC observations
  74. LIGO/Virgo G211117: LBT Follow-up of iPTF15fen
  75. LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations
  76. LIGO/Virgo G211117: SkyMapper observations and transient candidate
  77. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  78. LIGO/Virgo G211117: List of near-term future observation regions by Project Mini-GWAC of SVOM
  79. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  80. LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29
  81. LIGO/Virgo G211117: Further Swift-XRT sources
  82. GRB 151228A: T60 observations
  83. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  84. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  85. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  86. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  87. GRB 151228A: Fermi GBM observation
  88. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  89. LIGO/Virgo G211117: Further Swift-XRT sources
  90. GRB 151228A: Swift detection of a short burst
  91. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  92. GRB 151212A iTelescope observation
  93. V404Cyg Swift Trigger 668097:
  94. GRB 151216A: MAXI/GSC detection
  95. GRB151215A: Early optical light curve from pt5m, La Palma
  96. GRB 151215A: MASTER early OT detection and light curve
  97. GRB 151215A: Swift detection of a burst
  98. GRB 151212A: GROND Optical Afterglow Candidate
  99. GRB 151212A: Swift-XRT afterglow detection
  100. GRB 151212A: MAXI/GSC detection

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