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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"

5846 results found.

  1. GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates
  2. GRB 200514A: MITSuME Akeno optical upper limits
  3. Optical transient ZTF20aazpphd is unrelated to GRB 200514B
  4. GRB 200514B: Fermi GBM Final Real-time Localization
  5. GRB 200514A: MAXI/GSC detection
  6. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  7. Swift GRB 200509A: Global MASTER-Net observations report
  8. GRB 200506C: AstroSat CZTI detection
  9. Swift Detection of a burst from SGR Swift J1818.0-1607
  10. GRB 200506C: Fermi GBM Final Real-time Localization
  11. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  12. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  13. SGR 1935+2154 the Insight-HXMT observation plan
  14. GRB 200425A: LCO Optical Upper Limits
  15. Fermi GRB 200423A: Global MASTER-Net observations report
  16. Fermi GRB 200421A: Global MASTER-Net observations report
  17. Fermi GRB 200420A: Global MASTER-Net observations report
  18. Fermi trigger No 608935505: Global MASTER-Net observations report
  19. Improved IPN error box for GRB 200415A (consistent with the Sculptor Galaxy)
  20. Konus-Wind observation of GRB 200412B
  21. GRB 200412B: MITSuME Akeno optical observation
  22. GRB 200412B: CALET Gamma-Ray Burst Monitor detection
  23. GRB 200412B: Xinglong TNT optical observations
  24. GRB 200412B: SAO RAS observations of OT
  25. IceCube-200410A: No significant detection in HAWC
  26. GRB 200412B: Optical afterglow detection with 1.3m DFOT
  27. GRB 200412B : AstroSat CZTI detection
  28. Fermi GRB 200412A: Global MASTER-Net observations report
  29. GRB 200412B: Fermi GBM detection
  30. GRB 200412B: Fermi-LAT detection
  31. Konus-Wind observation of a bright burst from SGR 1935+2154
  32. IceCube-200410A: Upper limits from a search for additional neutrino events in IceCube
  33. GRB 200412B: BALROG localization (Fermi Trigger 608375325 / GRB 200412381)
  34. GRB 200412B: Fermi GBM Final Real-time Localization
  35. IceCube Alert 200410.97: Global MASTER-Net observations report
  36. SGR 1935+2154: Fermi GBM observation
  37. Baksan Neutrino Observatory Alert 200409.81: Global MASTER-Net observations report
  38. IPN Triangulation of a bright burst from SGR 1935+2154
  39. GRB 200409A: No detection of radio emission 5 hours post-burst
  40. GRB 200405B: ATCA follow-up and ASKAP limits on pre-burst radio emission
  41. Baksan Neutrino Observatory Alert 200408.26: Global MASTER-Net observations report
  42. Baksan Neutrino Observatory Alert 200409.23: Global MASTER-Net observations report
  43. Swift GRB 200409A: Global MASTER-Net observations report
  44. Fermi GRB 200407B: Global MASTER-Net observations report
  45. GRB 200407B: Fermi GBM Final Real-time Localization
  46. GRB 200405B: LCO Optical Upper Limits
  47. GRB 200405A: Fermi GBM Final Real-time Localization
  48. GRB 200325B: Mondy continued observations
  49. Fermi GRB 200402C: Global MASTER-Net observations report
  50. GRB 200402A: BALROG localization (Fermi Trigger 607513182 / GRB 200402403)
  51. GRB 200402A: Fermi GBM Final Real-time Localization
  52. Fermi GRB 200401A: Global MASTER-Net observations report
  53. Fermi trigger No 606918292: Global MASTER-Net observations report
  54. GRB 200324A: Swift detection of a burst
  55. LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC-F30 observations
  56. GRB 200320B: MAXI/GSC detection
  57. GRB 200320A: Fermi GBM Final Localization
  58. Chandra observations of GW170817 at 2.5 years since merger (All epochs 4 of 4)
  59. LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
  60. Fermi trigger No 605789837: Global MASTER-Net observations report
  61. Fermi trigger No 605632577: Global MASTER-Net observations report
  62. Chandra observations of GW170817 ~ 2.5 years since merger (epoch 1 of 4)
  63. GRB 200310A: MAXI/GSC detection
  64. GRB 200306C: ALMA 3mm upper limit
  65. Fermi trigger No 605309224: Global MASTER-Net observations report
  66. LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
  67. GRB 200306A: Swift detection of a burst
  68. GRB 200303A: Swift detection of a burst
  69. LIGO/Virgo S200224ca: No counterpart candidates in TOROS observations
  70. LIGO/Virgo S200302c: No significant counterpart candidates in Fermi-LAT observations
  71. LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
  72. LIGO/Virgo S200219ac: AstroSat CZTI upper limits
  73. LIGO/Virgo S200302c: Identification of a GW compact binary merger candidate
  74. LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
  75. Fermi trigger No 604565918: Global MASTER-Net observations report
  76. LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
  77. GRB 200227A: MITSuME Akeno optical upper limit
  78. GRB 200227A: Swift detection of a burst
  79. LIGO/Virgo S200224car: GRAWITA VST-ESO PARANAL observations.
  80. LIGO/Virgo S200219ac: Upper limits from Konus-Wind observations
  81. LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
  82. Fermi trigger No 604231129: Global MASTER-Net observations report
  83. LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
  84. LIGO/Virgo S200225q: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
  85. IPN triangulation of GRB 200224C
  86. Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A)
  87. GRB 200224C: Fermi GBM Final Real-time Localization
  88. GRB 200224A: Tautenburg observations
  89. LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
  90. LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
  91. IPN triangulation of GRB 200219B (inconsistent with the LIGO/Virgo S200219ac)
  92. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  93. LIGO/Virgo S200219ac: No transient candidates in CALET observations
  94. Fermi trigger No 603849435: Global MASTER-Net observations report
  95. LIGO/Virgo S200219ac: No counterpart candidates in Fermi-LAT observations
  96. LIGO/Virgo S200219ac: upper limits from AGILE/GRID observations
  97. LIGO/Virgo S200219ac: upper limits from AGILE/MCAL observations
  98. LIGO/Virgo S200219ac : no neutrino counterpart candidate in ANTARES search
  99. LIGO/Virgo S200219ac: Upper limits from IceCube neutrino searches
  100. LIGO/Virgo S200219ac: Coverage and upper limits from MAXI/GSC observations

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