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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"

43933 results found.

  1. GRB 170325B: POLAR Observation
  2. GRB 170325A: Fermi GBM observation
  3. LIGO/Virgo G277583: Konus-Wind observations
  4. GRB 170325A, Swift-BAT detection of a short GRB
  5. INTEGRAL pointed follow-up of IceCube-170321A
  6. LIGO/Virgo G277583: Fermi GBM Observations
  7. Konus-Wind observation of GRB 170320A
  8. GRB 170320A: POLAR Observation
  9. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  10. Fermi GBM Observation of IceCube-170321A
  11. LIGO/Virgo G275697: AMI Large Array Search for a Radio Afterglow
  12. Fermi GBM trigger 511851891/170322212 is not a GRB
  13. IceCube-170321A - IceCube observation of a high-energy neutrino candidate event
  14. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  15. IPN Triangulation of GRB 170320A (long/intense)
  16. Search for counterpart to IceCube-170321A with ANTARES
  17. GRB 170318A: KAIT Optical Upper Limit
  18. GRB 170317A: Mondy optical observations
  19. GRB 170318B: Swift-BAT refined analysis
  20. GRB 170317A: POLAR observation
  21. GRB 170318B: RATIR Optical and NIR Observations
  22. GRB 170317A: RATIR Optical and NIR Observations
  23. GRB 170318B: Swift/UVOT Upper Limits
  24. GRB 170318B: Swift-XRT refined Analysis
  25. GRB 170318A: Swift-XRT refined Analysis
  26. LIGO/Virgo G277583: CALET Observations
  27. GRB 170318A: RATIR Optical and NIR Observations
  28. GRB 170318A: Swift/UVOT Upper Limits
  29. GRB 170318B: Fermi GBM observation
  30. GRB 170318A: Swift-BAT refined analysis
  31. GRB 170317A: RATIR Optical and NIR Observations
  32. GRB 170318B: Enhanced Swift-XRT position
  33. GRB 170318B: Prompt enhanced Swift-XRT position
  34. GRB 170318B: Swift detection of a burst
  35. GRB 170318A: Enhanced Swift-XRT position
  36. GRB 170315A: POLAR observation
  37. GRB 170318A: Prompt enhanced Swift-XRT position
  38. GRB 170318A: Swift detection of a burst
  39. IceCube-170312A: MASTER follow-up observations
  40. LIGO/Virgo G277583: Asiago spectroscopic classification of ATLAS17byo and ATLAS17cgg
  41. GRB 170317A: LCO FTN observations
  42. LIGO/Virgo G277583 : MAXI/GSC observations
  43. GRB 170317A: Swift-BAT refined analysis
  44. LIGO/Virgo G277583: AstroSat CZTI upper limits
  45. GRB 170317A: Swift/UVOT Detection
  46. GRB 170317A: Mondy optical observations
  47. GRB 170317A: MITSuME Okayama Ks-band upper-limit
  48. GRB 170317A: Swift-XRT refined Analysis
  49. IceCube-170312A: Swift-XRT observations
  50. GRB 170317A: GMG observation
  51. GRB 170317A: Enhanced Swift-XRT position
  52. GRB 170317A: ISON-Ussuriysk aferglow confirmation
  53. GRB 170317A: Swift detection of a burst with an optical counterpart
  54. LIGO/Virgo G275697: Swift-XRT source 23 no longer fading
  55. LIGO/Virgo G277583: Swift/BAT data search
  56. LIGO/Virgo G277583: Discovery Channel Telescope Follow-Up of ATLAS17cck
  57. LIGO/Virgo G277583: ATLAS coverage and transients over the first 2 days
  58. GRB 170307A: 15 GHz upper limit from AMI
  59. LIGO/Virgo G277583: ATLAS17cck is likely a minor planet
  60. LIGO/Virgo G277583: GROND follow up of ATLAS17cck
  61. LIGO/Virgo G277583: ATLAS17cck - a fast declining transient
  62. LIGO/Virgo G275697: DLT40 follow-up observation
  63. LIGO/Virgo G274296: DLT40 follow-up observation
  64. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  65. LIGO/Virgo G277583: ERRATUM LV GCN 20871: TAROT Calern (TCA) observations
  66. GRB 170311B: AstroSat CZTI detection
  67. LIGO/Virgo G277583: TAROT Calern (TCA) observations
  68. LIGO/Virgo G277583: SVOM/Mini-GWAC observations of the initial skymap
  69. LIGO/Virgo G275404: Medicina radio follow-up of near-infrared
  70. Fermi GBM trigger 510642159/170308210 is not a GRB
  71. LIGO/Virgo G277583: INTEGRAL was inactive at the time of the event
  72. LIGO/Virgo G277583 ANTARES search
  73. Konus-Wind observation of GRB 170311B
  74. LIGO/Virgo G277583: AGILE GRID observations
  75. LIGO/Virgo G277583: AGILE MCAL observations
  76. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  77. LIGO/Virgo G277583: IceCube neutrino observations
  78. LIGO/Virgo G277583: Identification of a GW Burst Candidate
  79. IPN Triangulation of GRB 170311B (long/very intense)
  80. GRB 170311A: VLT observations
  81. IceCube-170312A - IceCube update on a high-energy neutrino candidate event
  82. INTEGRAL observation of IceCube HESE 65274589 129281
  83. GRB 170311A: Swift-BAT refined analysis
  84. LIGO/Virgo G275697: GRAWITA NOT optical observations of Swift/XRT Source 23
  85. GRB 170311A: Swift-XRT refined Analysis
  86. GRB 170311A: Enhanced Swift-XRT position
  87. SN MASTER OT J042250.16-820415.4 is the possible optical counterpart of the gravitational waves event LIGO/Virgo G274296
  88. GRB 170311A: GROND upper limits
  89. GRB 170311A: MASTER-OAFA early optical observations
  90. GRB 170311A: Swift detection of a burst
  91. GRB 170309A: POLAR Observation
  92. GRB170306A: SALT observations
  93. GRB 170306A: GROND afterglow detection
  94. LIGO/Virgo G275404: Swift-XRT observations of sources in the AGILE error region
  95. LIGO/Virgo G275697: Swift-XRT source 23 is fading
  96. LIGO/Virgo G275404: Updated localization from LIGO data
  97. GRB 170306B: POLAR observation
  98. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  99. GRB 170305A: POLAR observation
  100. Swift trigger 741567: MASTER red star flare detection

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