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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"

5553 results found.

  1. GRB 170205A: Swift detection of a burst with an optical counterpart
  2. GRB 170202A: SQUEAN Observation
  3. GRB 170202A: LCO FTN observations
  4. GRB 170202A VLT/X-shooter redshift [minor correction]
  5. GRB 170203A: Swift detection of a burst
  6. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  7. LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates
  8. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  9. LIGO/Virgo G270580: Pan-STARRS coverage and bright, rising transient PS17yt
  10. LIGO/Virgo G270580: Swift-XRT sources
  11. LIGO/Virgo G268556: Global MASTER Net 21 OTs detection
  12. Swift Trigger #733426: possible detection of a burst or transient
  13. GRB 170113A: Swift/UVOT Observations
  14. GRB 170112A: Swift detection of a short burst
  15. LIGO/Virgo G268556: Additional GROWTH follow up observation of iPTF Optical Transient Candidates
  16. LIGO/Virgo G268556: VLA follow-up of iPTF17cw
  17. GRB 170111A: MASTER-OAFA (Argentina) prompt OT observations
  18. GRB 170109A: POLAR Observation
  19. LIGO/Virgo G268556: GWAC_F60B (60cm) follow-up two events of EWE001 and EWE002
  20. LIGO/Virgo G268556: iPTF Optical Transient Candidates
  21. LIGO/Virgo G268556: Swift-XRT detection of ATLAS17aeu
  22. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  23. LIGO/Virgo G268556: observation regions by Project Mini-GWAC of SVOM
  24. GRB 161229A: POLAR observation
  25. GRB 161214A: MASTER-IAC early optical observations
  26. Fermi GBM trigger 503982114/161221126 is not a GRB
  27. GRB 161217B: POLAR Observation
  28. IPN Triangulation of GRB 161218B (long/very bright)
  29. GRB 161218A: CALET Gamma-Ray Burst Monitor detection
  30. Konus-Wind observation of GRB 161218A
  31. GRB 161218A: Swift detection of a burst
  32. GRB 161202A: MITSuME Okayama upper limits
  33. GRB 161123A: MAXI/GSC detection
  34. GRB 161119A: MASTER-SAAO possible OT detection during Fermi Alert
  35. GRB 161108A: NOT candidate afterglow
  36. GRB 161108A: Swift detection of a burst
  37. Fermi LAT Gamma-ray Observations of IceCube-161103
  38. IceCube-161103: Konus-Wind upper limits
  39. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  40. IceCube-161103: MASTER follow-up observations
  41. HAWC follow up of IceCube-161103
  42. IceCube-161103: IceCube observation of a very-high-energy neutrino
  43. Swift Trigger 718766 is not an astrophysical event.
  44. GRB 161017A: LT optical observations
  45. GRB 161017A: Lomonosov Gamma Ray and MASTER Optical prompt observations
  46. GRB161017A: optical observations with 1-m LCOGT McDonald
  47. GRB 161017A: TNG optical observations
  48. GRB 161017A: MITSuME Akeno Optical Observation
  49. GRB161017.74 MASTER-Net OT detection
  50. Konus-Wind observation of GRB 161015A
  51. GRB161015A: AstroSat CZTI detection
  52. GRB 161015A: Fermi GBM detection
  53. GRB 161015A: Fermi-LAT detection
  54. GRB 161014A: TNG optical observations
  55. GRB 161014A: Continued MITSuME Akeno Optical Observation
  56. GRB 161014A : Xinglong TNT optical observation
  57. GRB 160925A: Kottamia R-band observation
  58. GRB 161001A: GROND afterglow candidate
  59. GRB 160814A: MAXI/GSC detection
  60. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  61. GRB 160804A: ISON/UAFO optical observations
  62. Swift follow up of IceCube-160731A
  63. Swift Trigger 704327: MASTER syncronous optical observations
  64. Swift Trigger 704327: a possible GRB
  65. GRB 160712A: GROND observations
  66. GRB 160629A: AbAO optical observations
  67. GRB 160703A: MITSuME Ishigakijima Optical Observation
  68. GRB 160703A: MITSuME Akeno Optical Observations
  69. GRB 160625B: RTT150 optical observations
  70. GRB 160625B: MITSuME Ishigakijima Optical Observation
  71. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  72. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  73. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  74. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  75. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  76. Trigger 689956: Swift detection of a source near the Galactic center
  77. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  78. Konus-Wind observation of GRB 160530A
  79. IPN Triangulation of GRB 160530A
  80. GRB 160525B: MITSuME Akeno optical upper limits
  81. GRB 160530A: discovery with the Compton Spectrometer and Imager
  82. The nature of the Fermi/GBM trigger 160523919 is unknown.
  83. Swift detection of SGR 1935+2154
  84. GRB 160521A: a long GRB detected by INTEGRAL
  85. GRB 160509A: MAXI/GSC refined analysis
  86. LIGO/Virgo G211117: Astrosat CZTI upper limits
  87. GRB 160506A: Swift detection of a burst
  88. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  89. GRB 160503A: Fermi GBM observation
  90. GRB 160503A: Fermi-LAT detection
  91. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  92. GRB 160417A: GMG observations
  93. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  94. GRB 160409A found in Swift BAT ground analysis
  95. GRB 160410A: Swift/UVOT Detection
  96. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  97. LIGO/Virgo G211117: LOFAR follow-up
  98. GRB 160327A: JCMT SCUBA-2 sub-mm observation
  99. GRB 160327A: Continued RATIR Optical and NIR Observations
  100. GRB 160327A: Mondy optical upper limit

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