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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

5386 results found.

  1. GRB 140419A: MITSuME Okayama Optical Observation
  2. GRB 140408A: MITSuME Akeno Optical observation
  3. GRB 140406A: Fermi GBM observation
  4. GRB 140402A: Swift-XRT observations
  5. GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
  6. GRB 140331A: MITSuME Okayama upper limits
  7. GRB 140331A: RATIR Optical and NIR Observations
  8. GRB 140320D: MASTER optical observations
  9. GRB 140329A: Fermi GBM observation of a bright burst
  10. GRB 140320C: Mondy optical observations and afterglow confirmation
  11. GRB 140320A: RATIR Optical and NIR Observations
  12. GRB 140320B: P60 detection of a very red afterglow
  13. GRB 140320C: MASTER optical observations
  14. GRB 140318A: Continued RATIR Optical and NIR Observations
  15. GRB 140318A: Mondy optical limit
  16. GRB 140311B: Mondy optical limit
  17. GRB 140311A: Mondy optical limits
  18. GRB 140318A: RATIR Optical and NIR Detections
  19. GRB140318A: Discovery Channel Telescope Optical Detection
  20. GRB140308A: Suzaku WAM observation of the prompt emission
  21. GRB 140311C: Swift-XRT and UVOT observations
  22. GRB 140311C: MASTER before, during and after trigger optical observations
  23. GRB 140311A: RATIR Optical and NIR Detection
  24. GRB 140311A: Montarrenti Observatory optical upper limit
  25. GRB 140311A: Kottamia I-band observation
  26. Fermi416242156: possible iPTF counterpart
  27. GRB 140311B: RATIR Optical and NIR Observations
  28. GRO J1744-28: Fermi GBM observation
  29. GRB 140311B: Nanshan afterglow detection
  30. GRB 140311B: MASTER early optical observations
  31. GRB 140311A: Nanshan OT detection
  32. GRB 140311A: MASTER early optical observations
  33. Konus-Wind observation of GRB 140308A
  34. IPN Triangulation of GRB 140308A
  35. GRB 140306A: Suzaku WAM observation of the prompt emission
  36. Konus-Wind observation of GRB 140306A
  37. IPN Triangulation of GRB 140306A
  38. GRB 140304A: Continued RATIR Optical and NIR Observations
  39. GRB 140306A: Fermi GBM detection
  40. GRB 140304A: MASTER OT light curve
  41. GRB 140304A: RATIR g-band Dropout
  42. GRB 140304A: Khureltogot optical observations
  43. GRB 140304A: Mondy optical observations
  44. GRB 140304A: Afterglow decay from Nanshan observations
  45. GRB 140304A: MASTER OT detecton
  46. GRB 140302A: MITSuME Okayama upper limits
  47. GRB 140215A: MITSuME Okayama Optical Observation
  48. GRB140206A: Discovery Channel Telescope Optical Detection
  49. GRB 140211A: Swift detection of a burst
  50. GRB 140129B: MASTER OT early light curve
  51. GRB140129A: RAPTOR Observations of the Early Afterglow
  52. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  53. GRB 140129A: P60 optical afterglow detection
  54. GRB 140129A: Swift detection of a burst with an optical afterglow
  55. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  56. GRB 140118A: Swift detection of a burst
  57. GRB 140103A: optical upper limit
  58. GRB 140114A: NOT afterglow observations
  59. GRB 140103A: AAO optical afterglow candidate
  60. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  61. GRB 140110A: Swift XRT observations
  62. GRB 131231A: AAO optical observations
  63. LOAO R-band Observation of GRB 140102A
  64. GRB 131209A: Further Swift XRT observations
  65. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  66. GRB 140102A: P60 observations
  67. GRB 140102A: GROND observations
  68. GRB 131224B detected in ground analysis of Swift-BAT data
  69. GRB 131231A: P60 observations
  70. GRB 131231A: MDM afterglow observation
  71. GRB 131224A: Swift-XRT observation
  72. Trigger 581129: Swift-BAT triggered on noise
  73. GRB131202A : GROND observations
  74. GRB 131127B: rejection of optical counterpart candidates
  75. GRB 131126A: Fermi GBM observation
  76. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  77. GRB 131202A : XMM-Newton planned observation
  78. Konus-Wind observation of GRB 131126A
  79. IPN Triangulation of GRB 131126A (short/hard)
  80. IPN Triangulation of GRB 131127B
  81. Fermi407254341: iPTF optical afterglow candidates
  82. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  83. GRB 131108A: 1.23m CAHA optical candidate
  84. GRB 131105A: VLT/X-shooter redshift
  85. GRB 131105A: VLT/X-shooter optical afterglow candidate
  86. GRB 131031A: Swift-XRT observations
  87. GRB 131028A: Fermi GBM detection
  88. GRB 131018B: Swift-XRT observations
  89. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  90. GRB 131011A: GROND afterglow observations
  91. GRB 131004A: Swift detection of a burst (may be short)
  92. GRB 131002B: GROND upper limits
  93. GRB 131002A: ISON-NM optical observations
  94. GRB 131002A: Enhanced Swift-XRT position
  95. GRB 131002A: Swift detection of a burst
  96. GRB 131002A: Faulkes Telescope North optical afterglow
  97. GRB 130930A: Swift detection of a burst
  98. Fermi LAT Upper Limits on GRB 130925A
  99. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  100. GRB 130925A: Historical non-detection from Rosat-HRI

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