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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"

5862 results found.

  1. Fermi GRB 220417A: Global MASTER-Net observations report
  2. Fermi trigger No 671729344: Global MASTER-Net observations report
  3. IPN triangulation of GRB 220403C
  4. Fermi GRB 220411A: Global MASTER-Net observations report
  5. GRB 220408A: NOT optical observations and archival detection
  6. Fermi GRB 220408B: Global MASTER-Net observations report
  7. IceCube Alert 220405.21: Global MASTER-Net observations report
  8. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  9. Fermi GRB 220401B: Global MASTER-Net observations report
  10. Fermi GRB 220330A: Global MASTER-Net observations report
  11. GRB 220330A: Fermi GBM Final Real-time Localization
  12. GRB 220326A: Fermi GBM Final Localization
  13. GRB 220325A: LCO Optical Upper Limits
  14. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  15. Fermi GRB 220310B: Global MASTER-Net observations report
  16. GRB 220310A: MAXI/GSC detection
  17. MAXI GRB220310.02: Global MASTER-Net observations report
  18. Fermi GRB 220309A: Global MASTER-Net observations report
  19. Fermi trigger No 668410535: Global MASTER-Net observations report
  20. IceCube Alert 220304.74: Global MASTER-Net observations report
  21. Fermi trigger No 667737010: Global MASTER-Net observations report
  22. ZTF22aaajecp/AT2022cmc: DECam Photometry
  23. Konus-Wind observation of GRB 220219B
  24. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  25. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  26. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  27. IceCube Alert 220220.60: Global MASTER-Net observations report
  28. Fermi trigger No 666962499: Global MASTER-Net observations report
  29. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  30. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  31. Fermi GRB 220211B: Global MASTER-Net observations report
  32. Fermi GRB 220211A: Global MASTER-Net observations report
  33. GRB 210919A: Maidanak optical observations
  34. GRB 220209A: Fermi GBM Detection
  35. GRB 220209A: AGILE/MCAL detection
  36. Fermi GRB 220209A: Global MASTER-Net observations report
  37. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  38. GRB 220131B: GECAM detection
  39. IPN triangulation of GRB 220124A
  40. Fermi trigger No 664738369: Global MASTER-Net observations report
  41. AGILE observations of a bright burst from SGR 1935+2154
  42. Fermi-LAT-ANTARES 220121a Coincidence
  43. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  44. IPN triangulation of a bright burst from SGR 1935+2154
  45. GRB 220118A: 2.2m CAHA/CAFOS detections
  46. Konus-Wind observation of the recent SGR 1935+2154 activity
  47. GRB 220118A: MITSuME Akeno optical observation
  48. Fermi trigger No 663967527: Global MASTER-Net observations report
  49. Fermi trigger No 663923149: Global MASTER-Net observations report
  50. Fermi trigger No 663899819: Global MASTER-Net observations report
  51. Fermi trigger No 663886592: Global MASTER-Net observations report
  52. Fermi trigger No 663966693: Global MASTER-Net observations report
  53. Fermi trigger No 663669570: Global MASTER-Net observations report
  54. GRB 220107A: further SAO RAS optical observations
  55. Fermi trigger No 663406755: Global MASTER-Net observations report
  56. GRB 220107A: AbAO and Terskol optical observations
  57. Fermi trigger No 663129379: Global MASTER-Net observations report
  58. Fermi GRB 220103A: Global MASTER-Net observations report
  59. Fermi trigger No 662768315: Global MASTER-Net observations report
  60. GRB 220101A: Xinglong-2.16m photometry and spectroscopy
  61. GRB 220101A: Swift detection of a burst with a bright optical counterpart
  62. IPN triangulation of GRB 211219A
  63. GRB 211229A: Swift-XRT and UVOT observations
  64. Fermi GRB 211229B: Global MASTER-Net observations report
  65. GRB 211227A: Swift detection of a burst
  66. Swift GRB 211225B: Global MASTER-Net observations report
  67. Fermi GRB 211225C: Global MASTER-Net observations report
  68. GRB 211218A: MITSuME Akeno optical upper limits
  69. GRB 211221A: MeerLICHT optical limits
  70. GRB 211218A, MAXI J0909-041: MAXI/GSC detection
  71. MAXI GRB211218.04: Global MASTER-Net observations report
  72. GRB 211211A: Insight-HXMT/HE detection
  73. GRB 211211A - Gemini K-band detection
  74. GRB 211211A: SAO RAS optical observations
  75. GRB 211211A: AbAO optical observations
  76. GRB 211211A: CALET Gamma-Ray Burst Monitor detection
  77. GRB 211211A: NOT optical spectroscopy
  78. GRB 211211A: Nanshan/NEXT optical observations
  79. GRB 211212A: Fermi GBM Final Real-time Localization
  80. GRB 211211A: Fermi GBM observation
  81. Fermi GRB 211211B: Global MASTER-Net observations report
  82. GRB 211207A: Swift/UVOT Detection
  83. GRB 211211A: KAIT Optical Afterglow Candidate
  84. GRB 211211A: Swift detection of a bright burst
  85. GRB 211211A: Fermi GBM Final Real-time Localization
  86. Fermi trigger No 660868196: Global MASTER-Net observations report
  87. IceCube-211208A: No significant detection in HAWC
  88. AMON NuEm-211020A: No neutrino counterpart detected with ANTARES
  89. Fermi trigger No 660736561: Global MASTER-Net observations report
  90. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  91. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-211209A
  92. GRB 211207A: Swift detection of a burst with an optical counterpart
  93. Fermi GBM Upper limits for GRB 211203A
  94. GRB 211203A: Swift detection of a burst
  95. Fermi GRB 211130A: Global MASTER-Net observations report
  96. GRB 211129A: Fermi GBM observation
  97. GRB 211129A: MITSuME Akeno optical upper limits
  98. GRB 211129A: Swift detection of a burst
  99. GRB 211120548: Fermi GBM observation
  100. IceCube-211123A: INTEGRAL was inactive at the time of the event

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